Page 1
2006
-
08 BRAKES
Brake system indicator (B)
2008 Honda Civic GX
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
ABS System - Civic (All Except Hybrid)
COMPONENT LOCATION INDEX
Fig. 1: Locating ABS Components
GENERAL TROUBLESHOOTING INFORMATION
SYSTEM INDICATOR
This system has two indicators:
ABS indicator (A)
Page 2
turned on. If the problem goes away (system returns to normal), the indicator(s) will
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 2: Identifying ABS And Brake System Indicators
When the system is OK, each indicator comes on for about 2 seconds after turning
the ignition switch ON (II), then goes off.
When the system detects a problem, a DTC will be set and, depending upon the
failure, the ABS modulator-control unit will determine which indicator(s) will be
be controlled in the following way depending upon the DTC that was set:
The indicator(s) will come on and stay on when the ignition switch is ON (II).
The indicator(s) will automatically go off.
The indicator(s) will go off after the vehicle is driven.
ABS Indicator
The ABS indicator comes on when the ABS function is lost. The brakes still work
like a conventional system.
Brake System Indicator
The brake system indicator comes on when the EBD function is lost, the parking
brake is applied, and/or the brake fluid level is low.
NOTE: If two or more wheel sensors fail, the brake system
indicator will come on.
Page 3
DIAGNOSTIC TROUBLE CODE (DTC)
more than once, the more recent DTC is written over the earlier one. Therefore,
the fluid in the reservoir is forced out to the master cylinder, causing kickback at the
control unit is functioning.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
The memory can hold all DTCs. However, when the same DTC is detected
when the same problem is detected repeatedly, it is memorized as a single
DTC.
The DTCs are indicated in the order they occur.
The DTCs are memorized in the EEPROM. Therefore, the memorized DTCs
canno
t be canceled by disconnecting the battery. Do the specified procedures
to clear the DTCs.
SELF-DIAGNOSIS
Self-diagnosis can be classified into two categories:
Initial diagnosis: Done right after the ignition switch is turned ON (II) and
until the ABS indicator goes off.
Regular diagnosis: Done right after the initial diagnosis until the ignition
switch is turned OFF.
When the system detects a problem, the ABS modulator-control unit shifts to
fail-safe mode.
KICKBACK
The pump motor operates when the ABS modulator-control
unit is functioning, and
brake pedal.
PUMP MOTOR
The pump motor operates when the ABS modulator-
The ABS modulator-control unit checks the pump motor operation during
regular diagnosis when the vehicle is driven over 10 mph (15 km/h) the first
time after the ignition switch is turned ON (II). You may hear the motor
operate at this time, but it is normal.
BRAKE FLUID REPLACEMENT/AIR BLEEDING
Page 4
The troubleshooting procedures assume that the cause of the problem is still present
The term "intermittent failure" means a system may have had a failure, but it checks
(DLC) (A) located under the driver's side of the dashboard.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Brake fluid replacement and air bleeding procedures are identical to the procedures
used on vehicles without ABS (see BRAKE SYSTEM BLEEDING ).
HOW TO TROUBLESHOOT DTCS
and the ABS indicator is still on. Following a troubleshooting procedure for a code
that has been cleared and does not reset can result in incorrect diagnosis.
1. Question the customer about the conditions when the problem occurred, and
try to reproduce the same conditions for troubleshooting. Find out when the
ABS indicator came on, such as during ABS operation, after ABS operation,
when vehicle was traveling at a certain speed, etc.
2. When the ABS indicator does not come on during the test-drive, but
troubleshooting is done based on the DTC, check for loose connectors, poor
contact of the terminals, etc. before you start troubleshooting.
3. After troubleshooting, or repairs are done, clear the DTCs, and test-drive the
vehicle under the same conditions that originally set the DTCs. Make sure the
ABS indicator does not come on.
4. Check for other unit DTCs which are connected via F-CAN, if there are DTCs
that are related to F-CAN, the most likely cause was that the ignition switch
was turned ON (II) with the ABS modulator-control unit connector
disconnected. Clear the DTCs. Check for PGM-FI and ABS codes, and
troubleshoot those first.
INTERMITTENT FAILURES
OK now. If the indicator(s) of the system does not come on, check for poor
connections or loose pins at all connectors related to the circuit that you are
troubleshooting. If the indicators were on but then went out, the original problem
may have been intermittent.
HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM)
1. If the system indicators stay on, connect the HDS to
the data link connector
Page 5
snapshot data, and download any data found. Then refer to the indicated DTC's
), Si model (see
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 3: Connecting HDS To DLC
2. Turn the ignition switch ON (II).
3. Make sure the HDS communicates with the vehicle and the ABS modulatorcontrol unit. If it doesn't, troubleshoot the DLC circuit: Except Si model (see
DLC CIRCUIT TROUBLESHOOTING ), Si model (see DLC CIRCUIT
TROUBLESHOOTING ).
4. Check the diagnostic trouble code (DTC) and note it. Also check the on board
troubleshooting, and begin the appropriate troubleshooting procedure.
NOTE:
The HDS communication will be stopped when the
vehicle speed is at 31 mph (50 km/h) or more.
The HDS can read the DTC, current data, and other
system data.
For specific operations, refer to the Help menu that
came with the HDS.
HOW TO RETRIEVE DTCS
1. With the ignition switch to LOCK (0), connect the HDS to the data link
connector (DLC) under the driver's side of the dashboard.
2. Turn the ignition switch ON (II).
3. Make sure the HDS communicates with the vehicle and the ABS modulatorcontrol unit. If it doesn't, troubleshoot the DLC circuit: Except Si model (see
DLC CIRCUIT TROUBLESHOOTING
DLC CIRCUIT
Page 6
TROUBLESHOOTING
front wheel
front wheel
front wheel
front wheel
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
).
4. Follow the prompts on the HDS to display the DTC(s) on the screen. After
determining the DTC, refer to the DTC TROUBLESHOOTING.
5. Turn the ignition switch to LOCK (0).
HOW TO CLEAR DTCS
1. With the ignition switch to LOCK (0), connect the HDS
to the data link
connector (DLC) under the driver's side of the dashboard.
2. Turn the ignition switch ON (II).
3. Make sure the HDS communicates with the vehicle and the ABS modulatorcontrol unit. If it doesn't, troubleshoot the DLC circuit: Except Si model (see
DLC CIRCUIT TROUBLESHOOTING ), Si model (see DLC CIRCUIT
TROUBLESHOOTING ).
4. Clear the DTC(s) by following the screen prompts on the HDS.
5. Turn the ignition switch to LOCK (0).
DTC TROUBLESHOOTING INDEX
DTC TROUBLESHOOTING INDEX
Brake System
DTC Detection Item ABS Indicator
11 -13 Right-
ON
Indicator
(1)
ON/OFF
sensor circuit
12 -11 Right-
malfunction
sensor electrical
noise or
intermittent
interruption
-12 Right-
sensor short to
the other sensor
circuit
-21 Right-
ON
ON
ON
ON/OFF
(1)
(1)
ON/OFF
Page 7
front wheel
front wheel
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
sensor
installation error
-22 Right-
sensor
installation error
(19 mph (30
km/h) or more)
-23 Right-
sensor
installation error
(0 to 9 mph (0 to
15 km/h))
13 -13 Left-front wheel
sensor circuit
malfunction
14 -11 Left-front wheel
sensor electrical
ON
ON
ON
ON
ON/OFF
(1)
(1)
ON/OFF
(1)
ON/OFF
(1)
ON/OFF
(1)
ON/OFF
noise or
intermittent
interruption
-12 Left-front wheel
sensor short to
the other sensor
circuit
-21 Left-front wheel
sensor
installation error
-22 Left-front wheel
sensor
installation error
(19 mph (30
km/h) or more)
-23 Left-front wheel
sensor
ON
ON
ON
ON
ON/OFF
(1)
(1)
ON/OFF
(1)
ON/OFF
(1)
ON/OFF
Page 8
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
installation error
(0 to 9 mph (0 to
15 km/h))
15 -13 Right-rear wheel
sensor circuit
malfunction
16 -11 Right-rear wheel
sensor electrical
noise or
intermittent
interruption
-12 Right-rear wheel
sensor short to
the other sensor
circuit
-21 Right-rear wheel
sensor
installation error
-22 Right-rear wheel
sensor
ON
ON
ON
ON
ON
ON/OFF
(1)
(1)
ON/OFF
(1)
ON/OFF
(1)
ON/OFF
(1)
ON/OFF
installation error
(19 mph (30
km/h) or more)
-23 Right-rear wheel
sensor
installation error
(0 to 9 mph (0 to
15 km/h))
17 -13 Left-rear wheel
sensor circuit
malfunction
18 -11 Left-rear wheel
sensor electrical
noise or
ON
ON
ON
ON/OFF
(1)
(1)
ON/OFF
(1)
ON/OFF
Page 9
magnetic encoder
magnetic encoder
magnetic encoder
magnetic encoder
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
intermittent
interruption
-12 Left-rear wheel
sensor short to
the other sensor
circuit
-21 Left-rear wheel
sensor
installation error
-22 Left-rear wheel
sensor
installation error
(19 mph (30
km/h) or more)
-23 Left-rear wheel
sensor
installation error
(0 to 9 mph (0 to
ON
ON
ON
ON
ON/OFF
(1)
(1)
ON/OFF
(1)
ON/OFF
(1)
ON/OFF
21 -11 Right-front
22 -11 Left-front
23 -11 Right-rear
24 -11 Left-rear
15 km/h))
malfunction
(pulse missing)
malfunction
(pulse missing)
malfunction
(pulse missing)
malfunction
ON
ON
ON
ON
ON/OFF
(1)
(1)
ON/OFF
(1)
ON/OFF
(1)
ON/OFF
Page 10
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
(pulse missing)
31 -01 ABS right-front
inlet solenoid
valve
malfunction
(solenoid initial
pulse)
-21 ABS right-front
inlet solenoid
valve
malfunction
(solenoid pulse)
-22 ABS right-front
inlet solenoid
valve
malfunction
(solenoid
speculative)
ON ON
ON ON
ON ON
-23 ABS right-front
inlet solenoid
valve
malfunction
(solenoid stuck
ON)
32 -01 ABS right-front
outlet solenoid
valve
malfunction
(solenoid initial
pulse)
-21 ABS right-front
outlet solenoid
valve
malfunction
(solenoid pulse)
ON ON
ON ON
ON ON
Page 11
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
-22 ABS right-front
outlet solenoid
valve
malfunction
(solenoid
speculative)
-23 ABS right-front
outlet solenoid
valve
malfunction
(solenoid stuck
ON)
33 -01 ABS left-front
inlet solenoid
valve
malfunction
(solenoid initial
ON ON
ON ON
ON ON
pulse)
-21 ABS left-front
inlet solenoid
valve
malfunction
(solenoid pulse)
-22 ABS left-front
inlet solenoid
valve
malfunction
(solenoid
speculative)
-23 ABS left-front
inlet solenoid
valve
malfunction
ON ON
ON ON
ON ON
(solenoid stuck
ON)
Page 12
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
34 -01 ABS left-front
outlet solenoid
valve
malfunction
(solenoid initial
pulse)
-21 ABS left-front
outlet solenoid
valve
malfunction
(solenoid pulse)
-22 ABS left-front
outlet solenoid
valve
malfunction
(solenoid
speculative)
ON ON
ON ON
ON ON
-23 ABS left-front
outlet solenoid
valve
malfunction
(solenoid stuck
ON)
35 -01 ABS right-rear
inlet solenoid
valve
malfunction
(solenoid initial
pulse)
-21 ABS right-rear
inlet solenoid
valve
malfunction
(solenoid pulse)
ON ON
ON ON
ON ON
-22 ABS right-rear ON ON
Page 13
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
inlet solenoid
valve
malfunction
(solenoid
speculative)
-23 ABS right-rear
inlet solenoid
valve
malfunction
(solenoid stuck
ON)
36 -01 ABS right-rear
outlet solenoid
valve
malfunction
(solenoid initial
pulse)
-21 ABS right-rear
outlet solenoid
valve
malfunction
(solenoid pulse)
ON ON
ON ON
ON ON
-22 ABS right-rear
ON ON
outlet solenoid
valve
malfunction
(solenoid
speculative)
-23 ABS right-rear
ON ON
outlet solenoid
valve
malfunction
(solenoid stuck
ON)
37 -01 ABS left-rear ON ON
Page 14
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
inlet solenoid
valve
malfunction
(solenoid initial
pulse)
-21 ABS left-rear
inlet solenoid
valve
malfunction
(solenoid pulse)
-22 ABS left-rear
inlet solenoid
valve
malfunction
(solenoid
speculative)
-23 ABS left-rear
inlet solenoid
valve
malfunction
(solenoid stuck
ON)
ON ON
ON ON
ON ON
38 -01 ABS left-rear
outlet solenoid
valve
malfunction
(solenoid initial
pulse)
-21 ABS left-rear
outlet solenoid
valve
malfunction
(solenoid pulse)
-22 ABS left-rear
outlet solenoid
ON ON
ON ON
ON ON
Page 15
front wheel
Motor relay stuck
Motor relay stuck
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
valve
malfunction
(solenoid
speculative)
-23 ABS left-rear
ON ON
outlet solenoid
valve
malfunction
(solenoid stuck
ON)
41 -21 Right-
ON
ON/OFF
lock
42 -21 Left-front wheel
ON
ON/OFF
lock
43 -21 Right-rear wheel
ON
ON/OFF
lock
44 -21 Left-rear wheel
ON
ON/OFF
lock
51 -11 Motor lock ON OFF
-12 Motor lock
ON OFF
(1)
(1)
(1)
(1)
52 -12 Motor stuck OFF ON OFF
53 -01
54 -03 Fail-safe relay 1
circuit
malfunction
-13 Motor relay OFF
malfunction
ON 1
-12
ON 2
stuck ON
-04 Fail-safe relay 1
stuck OFF
(initial)
ON OFF
ON OFF
ON OFF
ON ON
ON ON
Page 16
power source low
power source low
power source low
different diameter
different diameter
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
-21 Fail-safe relay 1
stuck OFF (main)
61 -01 Modulator-
control unit
initial IG low
voltage
-21 Modulator-
control unit
voltage 1
-22 Modulator-
control unit
voltage 2
-23 Modulator-
control unit
ON ON
ON ON
ON ON
ON OFF
ON ON
voltage 3
62 -21 Modulator-
control unit IG
high voltage
71 -21 Right-front or
left-rear different
diameter tire
malfunction
-22 Left-front or
right-rear
tire malfunction
-23 Right-front and
right-rear
tire malfunction
ON ON
ON ON
ON ON
ON ON
-24 Left-front and ON ON
Page 17
different diameter
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
left-rear different
diameter tire
malfunction
-25 Right-front and
left-front
tire malfunction
-26 Right-rear and
left-rear different
diameter tire
malfunction
81 -01 Central
processing unit
(CPU) internal
circuit
malfunction
-05 Central
processing unit
(CPU) internal
ON ON
ON ON
ON ON
ON ON
circuit
malfunction
-06 Central
processing unit
(CPU) internal
circuit
malfunction
-08 Central
processing unit
(CPU) internal
circuit
malfunction
-11 Central
processing unit
(CPU) internal
ON ON
ON ON
ON ON
Page 18
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
circuit
malfunction
-14 Central
processing unit
(CPU) internal
circuit
malfunction
-23 Central
processing unit
(CPU) internal
circuit
malfunction
-30 Central
processing unit
(CPU) internal
circuit
malfunction
-31 Central
ON ON
ON ON
ON ON
ON ON
processing unit
(CPU) internal
circuit
malfunction
-32 Central
processing unit
(CPU) internal
circuit
malfunction
-51 Central
processing unit
(CPU) internal
circuit
malfunction
-52 Central
processing unit
ON ON
ON ON
ON ON
Page 19
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
(CPU) internal
circuit
malfunction
-71 Central
processing unit
(CPU) internal
circuit
malfunction
86 -01 F-CAN bus-off
malfunction
-24 F-CAN
communication
with engine
malfunction
-25 F-CAN
communication
with engine
malfunction
-FF F-CAN
ON OFF
OFF OFF
OFF OFF
OFF OFF
OFF OFF
(1)
SYMPTOM TROUBLESHOOTING INDEX
When the vehicle has one of these symptoms, check for a diagnostic trouble code
(DTC) with the HDS. If there is no DTC, do the diagnostic procedure for the
symptom, in the sequence listed, until you find the cause.
SYMPTOM TROUBLESHOOTING INDEX
HDS does not
communicate with Troubleshoot the DLC circuit: Except Si model (see
communication
with ABS
malfunction
Brake system indicator turns ON when 2 or more wheel sensors fail.
Symptom Diagnostic procedure
Page 20
indicator does not go
off, and no DTCs are
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
the ABS modulatorcontrol unit or the
vehicle
ABS indicator does
not come on
ABS indicator does
not go off, and no
DTCs are stored
DLC CIRCUIT TROUBLESHOOTING ), Si model
(see DLC CIRCUIT TROUBLESHOOTING ).
1. Do the gauge control module troubleshooting (see
SELF
-DIAGNOSTIC FUNCTION ).
2. Substitute a known-good ABS modulator-control
unit, then recheck. If it is OK, replace the original
ABS modulator-control unit: Except Si model (see
REMOVAL - EXCEPT SI MODEL ), Si model
(see REMOVAL - SI MODEL ).
1. Symptom Troubleshooting (see SYMPTOM
TROUBLESHOOTING ).
2. Do the gauge control module troubleshooting (see
SELF-DIAGNOSTIC FUNCTION ).
1. Do the gauge control module troubleshooting (see
Brake system
2. Substitute a known-good ABS modulator-control
indicator does not
come on
Brake system
1. Symptom Troubleshooting (see SYMPTOM
2. Do the gauge control module troubleshooting (see
stored
ABS indicator and
1. Symptom Troubleshooting (see SYMPTOM
brake system
indicator do not go
2. Do the gauge control module troubleshooting (see
off at the same time
SYSTEM DESCRIPTION
SELF-DIAGNOSTIC FUNCTION ).
unit, then recheck. If it is OK, replace the original
ABS modulator-control unit; Except Si model (see
REMOVAL
- EXCEPT SI MODEL ), Si model
(see REMOVAL - SI MODEL ).
TROUBLESHOOTING ).
SELF-DIAGNOSTIC FUNCTION ).
TROUBLESHOOTING ).
SELF-DIAGNOSTIC FUNCTION ).
ABS MODULATOR-CONTROL UNIT INPUTS AND OUTPUTS FOR 25P CONNECTOR
Page 21
Terminal
Wire
Terminal
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 4: Identifying ABS Modulator-Control Unit Inputs And Outputs For 25P
Connector
ABS MODULATOR-CONTROL UNIT INPUTS AND OUTPUTS FOR 25P
CONNECTOR
Measurement (Disconnect the
number
color
1 WHT CAN-H
2 GRN FR+B
3 GRY FL-GND
5 PUR RL-GND
LT
6
GRN
sign
RR+B
Description
F-CAN
communication
circuit
Detects rightfront wheel
sensor signal
Detects leftfront wheel
sensor signal
Detects left-rear
wheel sensor
signal
Detects rightrear wheel
sensor signal
ABS modulator-control unit
25P connector)
Terminal Conditions Results
- - -
- - -
- - -
- - -
- - -
8 WHT FSR+B
9 RED MR+B
Power source
for the fail-safe
relay
Power source
for the motor
8-GND At all times
Battery
voltage
9-GND At all times
Battery
Page 22
control unit, the wheel sensors, and
controls the anti
-
lock brake and the brakes distribution functions.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
relay voltage
10
K-LINE
BLU
12 ORN FL+B
14 BLU RL+B
15 WHT RR-GND
16 GRY IG1
17 RED CAN-L
LT
Communication
with HDS
Detects leftfront wheel
sensor signal
Detects left-rear
wheel sensor
signal
Detects rightrear wheel
sensor signal
Power source
for activating
the system
F-CAN
communication
- - -
- - -
- - -
- - -
Ignition
16-GND
switch
- - -
ON (II)
Battery
voltage
circuit
Detects right-
18 PNK FR-GND
front wheel
- - -
sensor signal
Ground for the
24 BLK GND
ABS modulator-
24-GND At all times Continuity
control unit
Ground for the
25 BLK MR-GND
25-GND At all times Continuity
pump motor
SYSTEM OUTLINE
This system is composed of the ABS modulatorthe system indicators in the gauge control module. The ABS modulator-control unit
Page 23
Without ABS, when the brake pedal is pressed while driving, the wheels sometimes
lock before the vehicle comes to a stop. In such an event, the maneuverability of the
rate.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 5: Identifying ABS Modulator-Control Unit System Outline
ABS FEATURES
vehicle is reduced if the front wheels are locked, and the stability of the vehicle is
reduced if the rear wheels are locked, creating an extremely unstable condition.
With ABS, the system precisely controls the slip rate of the wheels to ensure
maximum grip force from the tires, and it thereby ensures maneuverability and
stability of the vehicle. The ABS calculates the slip rate of the wheels based on the
four wheel speeds, then it controls the brake fluid pressure to reach the target slip
Page 24
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 6: Identifying Grip Force Of Tire And Road Surface
The control unit detects the wheel speed based on the wheel sensor signals it
received, then it calculates the vehicle speed based on the detected wheel speed.
The control unit detects the vehicle speed during deceleration based on the rate of
deceleration.
The control unit calculates the slip rate of each wheel, and transmits the control
signal to the modulator unit solenoid valve when the slip rate is high.
The hydraulic control has three modes: Pressure intensifying, pressure reducing,
and pressure retaining.
Fig. 7: Identifying Hydraulic Control Unit Flow Diagram
Page 25
EBD FEATURES
type modulator because
one channel for each wheel.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
The electronic brake distribution (EBD) feature helps control vehicle braking by
adjusting the rear brake force in accordance with the rear wheel load before the
ABS operates. Based on the wheel sensor signals, the control unit uses the
modulator to control the rear brakes individually. When the rear wheel speed is less
than the front wheel speed, the ABS modulator-control unit retains the current rear
brake fluid pressure by closing the inlet valve in the modulator. As the rear wheel
speed increases and approaches the front wheel speed, the ABS modulator-control
unit increases the rear brake fluid pressure by momentarily opening the inlet valve.
This whole process is repeated very rapidly. While this is happening, there is
kickback at the brake pedal.
Fig. 8: Identifying Rear Wheel Brake Pressure
MODULATOR UNIT
The ABS modulator consists of the inlet solenoid valve, the outlet solenoid valve,
the reservoir, the pump, the pump motor, and the damping chamber. The modulator
reduces the caliper fluid pressure directly. It is a circulatingthe brake fluid circulates through the caliper, the reservoir, and the master cylinder.
The hydraulic control has three modes; pressure intensifying, pressure retaining,
and pressure reducing. The hydraulic circuit is an independent four channel type;
Page 26
CIRCUIT DIAGRAM
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 9: Identifying Modulator Unit Circuit Diagram
MODES AND INLET/OUTLET SOLENOID VALVE POSITION
Mode
Inlet
Solenoid
Valve
Outlet
Solenoid
Valve
Brake Fluid
Pressure
Master cylinder fluid is pumped out
intensifying
open closed
to the caliper.
mode
Pressure
Caliper fluid is retained by the inlet
closed closed
retaining mode
and outlet valves.
Caliper fluid flows through the
outlet valve to the reservoir.
Pressure
The motor pumps the reservoir
closed open
reducing mode
fluid through the damping
chamber to the master cylinder
(1)
.
(1)
The motor will keep running until the operation of the one anti-lock brake
control is finished with the first pressure reducing mode.
Page 27
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 10: Anti-Lock Brake System Circuit Diagram (1 Of 3)
Page 28
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 11: Anti-Lock Brake System Circuit Diagram (2 Of 3)
Page 29
REAR WHEEL SENSOR
CIRCUIT MALFUNCTION; DTC 17
-
13: LEFT
-
REAR WHEEL SENSOR CIRCUIT MALFUNCTION
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 12: Anti-Lock Brake System Circuit Diagram (3 Of 3)
DTC TROUBLESHOOTING
DTC 11-13: RIGHT-FRONT WHEEL SENSOR CIRCUIT MALFUNCTION; DTC 13-13: LEFTFRON
T WHEEL SENSOR CIRCUIT MALFUNCTION; DTC 15-13: RIGHT-
Page 30
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it ON (II) again.
4. Check for DTCs with the HDS.
Is DTC 11-13, 13-13, 15-13, and/or 17-13 indicated?
YES - Go to step 5.
NO - Intermittent failure, the system is OK at this time. Check for loose
terminals between the wheel sensor 2P connector and the ABS modulatorcontrol unit 25P connector. Refer to INTERMITTENT FAILURES
TROUBLESHOOTING .
5. Turn the ignition switch to LOCK (0).
6. Disconnect the ABS modulator-control unit 25P connector.
7. Check for continuity between the appropriate ABS modulator-control unit 25P
connector wheel sensor +B and GND terminals (see ABS MODULATOR-
CONTROL UNIT 25P CONNECTOR WHEEL SENSOR +B AND
GND ), then check for continuity between the same terminals and reverse the
positive and negative tester probes.
ABS MODULATOR-CONTROL UNIT 25P CONNECTOR WHEEL
SENSOR +B AND GND
DTC ABS Modulator-control Unit 25P Connector Terminal No.
11-13 No. 2 No. 18
13-13 No. 12 No. 3
15-13 No. 6 No. 15
17-13 No. 14 No. 5
Page 31
- Replace the appropriate wheel sensor (see
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 13: Checking Continuity Between Appropriate ABS ModulatorControl Unit 25P Connector Wheel Sensor +B And GND Terminals
Is there continuity in both directions?
YES - Go to step 8.
NO - If there is no continuity in either direction, go to step 10. If there is
continuity in only one direction, go to step 12.
8. Disconnect the appropriate wheel sensor 2P connector.
9. On the sensor side, check for continuity between appropriate wheel sensor 2P
connector terminals No. 1 and No. 2, then check for continuity between the
same terminals and reverse the positive and negative tester probes.
Fig. 14: Checking Continuity Between Appropriate Wheel Sensor 2P
Connector Terminals No. 1 And No. 2
Is there continuity in both directions?
YES
WHEEL SENSOR
Page 32
REPLACEMENT
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
).
NO - Repair short in the wire between the appropriate wheel sensor and the
ABS modulator-control unit.
10. Disconnect the appropriate wheel sensor 2P connector.
11. On the sensor side, check for continuity between appropriate wheel sensor 2P
connector terminals No. 1 and No. 2, then check for continuity between the
same terminals and reverse the positive and negative tester probes.
Fig. 15: Checking Continuity Between Appropriate Wheel Sensor 2P
Connector Terminals No. 1 And No. 2
Is there continuity in only one direction?
YES - Repair open in the wire between the appropriate wheel sensor and the
ABS modulator-control unit.
NO - Replace the appropriate wheel sensor (see WHEEL SENSOR
REPLACEMENT ).
12. Check for continuity between body ground and the appropriate ABS
modulator-control unit 25P connector terminal (see table).
BODY GROUND AND APPROPRIATE ABS MODULATORCONTROL UNIT 25P CONNECTOR TERMINAL
DTC ABS Modulator-control Unit 25P Connector Terminal No.
11-13 No. 2 No. 18
13-13 No. 12 No. 3
Page 33
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
15-13 No. 6 No. 15
17-13 No. 14 No. 5
Fig. 16: Checking Continuity Between Body Ground And Appropriate
ABS Modulator-Control Unit 25P Connector Terminal
Is there continuity?
YES - Go to step 13.
NO - Go to step 15.
13. Disconnect the appropriate wheel sensor 2P connector.
14. On the sensor side, check for continuity between body ground and appropriate
wheel sensor 2P connector terminal No. 1 and No. 2 individually.
NOTE: Check the wheel sensor while mounted on the vehicle.
Fig. 17: Checking Continuity Between Body Ground And Appropriate
Page 34
Wheel Sensor 2P Connector Terminal No. 1 And No. 2
Modulator
-
Control Unit 25P Connector Terminal
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Is there continuity?
YES - Replace the appropriate wheel sensor (see WHEEL SENSOR
REPLACEMENT ).
NO - Repair short to body ground in the wire between the appropriate wheel
sensor and the ABS modulator-control unit.
15. Turn the ignition switch ON (II).
16. Measure voltage between body ground and the appropriate ABS modulatorcontrol unit 25P connector terminal (see BODY GROUND AND
APPROPRIATE ABS MODULATOR-CONTROL UNIT 25P
CONNECTOR TERMINAL ).
BODY GROUND AND APPROPRIATE ABS MODULATORCONTROL UNIT 25P CONNECTOR TERMINAL
DTC ABS Modulator-control Unit 25P Connector Terminal No.
11-13 No. 2 No. 18
13-13 No. 12 No. 3
15-13 No. 6 No. 15
17-13 No. 14 No. 5
Fig. 18: Measuring Voltage Between Body Ground And Appropriate ABS
Page 35
12 is indicated at same time, do the
may be an intermittent failure, the system is OK at this time. Check for loose
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Is there 0.1 V or more?
YES - Repair short to power in the wire between the appropriate wheel sensor
and the ABS modulator-control unit.
NO - Check for loose terminals in the ABS modulator-control unit 25P
connector. If necessary, substitute a known-good ABS modulator-control unit:
Except Si model (see REMOVAL
- EXCEPT SI MODEL ), Si model (see
REMOVAL - SI MODEL ), and retest.
DTC 12-11: RIGHT-FRONT WHEEL SENSOR ELECTRICAL NOISE OR INTERMITTENT
INTERRUPTION; DTC 14-11: LEFT-FRONT WHEEL SENSOR ELECTRICAL NOISE OR
INTERMITTENT INTERRUPTION; DTC 16-11: RIGHT-REAR WHEEL SENSOR ELECTRICAL
NOISE OR INTERMITTENT INTERRUPTION; DTC 18-11: LEFT-REAR WHEEL SENSOR
ELECTRICAL NOISE OR INTERMITTENT INTERRUPTION
NOTE: These DTCs may be caused by electrical interference.
Check for aftermarket devices installed in the vehicle when
these DTCs are indicated.
1. Turn the ignition switch ON (II).
2. Cl
ear the DTC with the HDS.
3. Test-drive the vehicle.
4. Check for DTCs with the HDS.
Is DTC 12-11, 14-11, 16-11, and/or 18-11 indicated?
YES - If the DTC 12-12,14-12,16-12 or 18-
DTC 12-12,14-12, 16-12 or 18-12 troubleshooting (see DTC 12-12: RIGHT-
FRONT WHEEL SENSOR SHORT TO THE OTHER SENSOR
CIRCUIT; DTC 14-12: LEFT-FRONT WHEEL SENSOR SHORT TO
THE OTHER SENSOR CIRCUIT; DTC 16-12: RIGHT-REAR WHEEL
SENSOR SHORT TO THE OTHER SENSOR CIRCUIT; DTC 18-12:
LEFT-REAR WHEEL SENSOR SHORT TO THE OTHER SENSOR
CIRCUIT ). If DTC 12-12,14-12,16-12 or 18-12 is not indicated, go to step 5.
NO - Troubleshoot the indicated DTC. If there are no DTCs indicated, there
Page 36
drive the vehicle. Drive the vehicle at 13 mph (20 km/h) or more, and go a
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
terminals between the wheel sensor 2P connector and the ABS modulatorcontrol unit 25P connector. Refer to INTERMITTENT FAILURES
TROUBLESHOOTING .
5. Turn the ignition switch to LOCK (0).
6. Check that the appropriate wheel sensor is properly mounted (see WHEEL
SENSOR REPLACEMENT ).
WHEEL SENSOR
DTC Appropriate Wheel Sensor
12-11 Right-front
14-11 Left-front
16-11 Right-rear
18-11 Left-rear
Is the wheel sensor installation OK?
YES - Check for loose terminals in the ABS modulator-control unit 25P
connector. If necessary, substitute a known-good ABS modulator-control unit:
Except Si model (see REMOVAL
- EXCEPT SI MODEL ), Si model (see
REMOVAL - SI MODEL ), and retest.
NO - Reinstall the wheel sensor, and check the mounting position (see
WHEEL SENSOR REPLACEMENT ).
DTC 12-12: RIGHT-FRONT WHEEL SENSOR SHORT TO THE OTHER SENSOR CIRCUIT; DTC
14-12: LEFT-FRONT WHEEL SENSOR SHORT TO THE OTHER SENSOR CIRCUIT; DTC 16-12:
RIGHT-REAR WHEEL SENSOR SHORT TO THE OTHER SENSOR CIRCUIT; DTC 18-12: LEFTREAR WHEEL SENSOR SHORT TO THE OTHER SENSOR CIRCUIT
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Testdistance of 328 ft (100 m) or more.
NOTE: Drive the vehicle on the road, not on the lift.
Page 37
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
4. Check for DTCs with the HDS.
Is DTC 12-12, 14-12, 16-12, and/or 18-12 indicated?
YES - Go to step 5.
NO - Intermittent failure, the system is OK at this time. Check for loose
terminals between the wheel sensor 2P connector and the ABS modulatorcontrol unit 25P connector. Refer to INTERMITTENT FAILURES
TROUBLESHOOTING .
5. Turn the ignition switch to LOCK (0).
6. Disconnect the ABS modulator-control unit 25P connector.
7. Check for continuity between the appropriate ABS modulator-control unit 25P
connector wheel sensor +B terminals (see ABS MODULATOR-CONTROL
UNIT 25P CONNECTOR WHEEL SENSOR +B TERMINALS ).
ABS MODULATOR-CONTROL UNIT 25P CONNECTOR WHEEL
SENSOR +B TERMINALS
ABS Modulator-control Unit 25P Connector Terminal No.
DTC
Appropriate Terminal Other Terminals
12-12 No. 2 No. 12 No. 6 No. 14
14-12 No. 12 No. 2 No. 6 No. 14
16-12 No. 6 No. 2 No. 12 No. 14
18-12 No. 14 No. 2 No. 12 No. 6
Page 38
Except Si model (see
), Si model (see
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 19: Checking Continuity Between Appropriate ABS ModulatorControl Unit 25P Connector Wheel Sensor +B Terminals
Is there continuity?
YES - Repair short in the wires between the appropriate wheel sensor and the
ABS modulator-control unit.
NO - Check for loose terminals in the ABS modulator-control unit 25P
connector. If necessary, substitute a known-good ABS modulator-control unit:
REMOVAL - EXCEPT SI MODEL
Page 39
REMOVAL
-
SI MODEL
FRONT
).
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
), and retest.
DTC 12-21: RIGHT-FRONT WHEEL SENSOR INSTALLATION ERROR; DTC 14-21: LEFTWHEEL SENSOR INSTALLATION ERROR; DTC 16-21: RIGHT-REAR WHEEL SENSOR
INSTALLATION ERROR; DTC 18-21: LEFT-REAR WHEEL SENSOR INSTALLATION ERROR
1. Test-drive the vehicle. Drive the vehicle at 7 mph (1
0 km/h).
NOTE: Drive the vehicle on the road, not on the lift.
2. Check the RF, LF, RR, LR WHEEL SPD in the ABS DATA LIST with the
HDS.
Are all four the same indicated value?
YES - Intermittent failure, the system is OK at this time. Check for loose
terminals between the wheel sensor 2P connector and the ABS modulatorcontrol unit 25P connector. Refer to INTERMITTENT FAILURES
TROUBLESHOOTING .
NO - Go to step 3.
3. Turn the ignition switch to LOCK (0).
4. Check that the appropriate wheel sensor is properly mounted (see WHEEL
SENSOR REPLACEMENT ).
WHEEL SENSOR
DTC Appropriate Wheel Sensor
12-21 Right-front
14-21 Left-front
16-21 Right-rear
18-21 Left-rear
Is the wheel sensor installation OK?
YES - Replace the appropriate wheel sensor (see WHEEL SENSOR
REPLACEMENT
Page 40
NO
FRONT WHEEL SENSOR INSTALLATION ERROR (19 MPH (30 KM/H)
Is the wheel sensor installation OK?
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
- Reinstall the wheel sensor, and check the mounting position (see
WHEEL SENSOR REPLACEMENT ).
DTC 12-22: RIGHT-FRONT WHEEL SENSOR INSTALLATION ERROR (19 MPH (30 KM/H) OR
MORE); DTC 14-22: LEFTOR MORE); DTC 16-22: RIGHT-REAR WHEEL SENSOR INSTALLATION ERROR (19 MPH (30
KM/H) OR MORE); DTC 18-22: LEFT-REAR WHEEL SENSOR INSTALLATION ERROR (19 MPH
(30 KM/H) OR MORE)
1. Test-drive the vehicle. Drive the vehicle between 19 mph (30 km/h) and 31
mph (50 km/h) for 70 seconds or more.
NOTE: Drive the vehicle on the road, not on the lift.
2. Check the RF, LF, RR, LR WHEEL SPD in the ABS DATA LIST with the
HDS.
Are all four the same indicated value?
YES - Intermittent failure, the system is OK at this time. Check for loose
terminals between the wheel sensor 2P connector and the ABS modulatorcontrol unit 25P connector. Refer to INTERMITTENT FAILURES
TROUBLESHOOTING .
NO - Go to step 3.
3. Turn the ignition switch to LOCK (0).
4. Check that the appropriate wheel sensor is properly mounted (see WHEEL
SENSOR REPLACEMENT ).
WHEEL SENSOR
DTC Appropriate Wheel Sensor
12-22 Right-front
14-22 Left-front
16-22 Right-rear
18-22 Left-rear
Page 41
YES
WHEEL SENSOR
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
- Replace the appropriate wheel sensor (see
REPLACEMENT ).
NO - Reinstall the wheel sensor, and check the mounting position (see
WHEEL SENSOR REPLACEMENT ).
DTC 12-23: RIGHT-FRONT WHEEL SENSOR INSTALLATION ERROR (
KM/H)); DTC 14-23: LEFT-FRONT WHEEL SENSOR INSTALLATION ERROR (0 TO 9 MPH (0 TO
15 KM/H)); DTC 16-23: RIGHT-REAR WHEEL SENSOR INSTALLATION ERROR (0 TO 9 MPH (0
TO 15 KM/H)); DTC 18-23: LEFT-REAR WHEEL SENSOR INSTALLATION ERROR (0 TO 9 MPH
(0 TO 15 KM/H))
0 TO 9 MPH (0 TO 15
1. Test-drive the vehicle. Drive the vehicle between 1 mph (1 km/h) and 9 mph
(15 km/h) in a straight line.
NOTE: Drive the vehicle on the road, not on the lift.
2. Check the RF, LF, RR, LR WHEEL SPD in the ABS DATA LIST with the
HDS.
Are all four the same indicated value?
YES - Intermittent failure, the system is OK at this time. Check for loose
terminals between the wheel sensor 2P connector and the ABS modulatorcontrol unit 25P connector. Refer to INTERMITTENT FAILURES
TROUBLESHOOTING .
NO - Go to step 3.
3. Turn the ignition switch to LOCK (0).
4. Check that the appropriate wheel sensor is properly mounted (see WHEEL
SENSOR REPLACEMENT ).
WHEEL SENSOR
DTC Appropriate Wheel Sensor
12-23 Right-front
14-23 Left-front
16-23 Right-rear
Page 42
drive the vehicle. Drive the vehicle at 13 mph (20 km/h) or more, and go a
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
18-23 Left-rear
Is the wheel sensor installation OK?
YES - Replace the appropriate wheel sensor (see WHEEL SENSOR
REPLACEMENT ).
NO - Reinstall the wheel sensor, and check the mounting position (see
WHEEL SENSOR REPLACEMENT ).
DTC 21-11: RIGHT-FRONT MAGNETIC ENCODER MALFUNCTION (PULSE MISSING); DTC 2211: LEFT-FRONT MAGNETIC ENCODER MALFUNCTION (PULSE MISSING); DTC 23-11:
RIGHT-REAR MAGNETIC ENCODER MALFUNCTION (PULSE MISSING); DTC 24-11: LEFTREAR MAGNETIC ENCODER MALFUNCTION (PULSE MISSING)
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Testdistance of 328 ft (100 m) or more.
NOTE: Drive the vehicle on the road, not on the lift.
4. Check for DTCs with the HDS.
Is DTC 21-11,22-11,23-11, and/or 24-11 indicated?
YES - Go to step 5.
NO - Intermittent failure, the system is OK at this time. Check for loose
terminals between the wheel sensor 2P connector and the ABS modulatorcontrol unit 25P connector. Refer to INTERMITTENT FAILURES
TROUBLESHOOTING .
5. Turn the ignition switch to LOCK (0).
6. Inspect the appropriate magnetic encoder for debris or cracks.
MAGNETIC ENCODER
Appropriate
Page 43
XX*: ABS
1.
Turn the ignition switch ON (II).
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
DTC
Note
Encoder
21-
Magnetic
11
Right-front
Remove the driveshaft outboard joint from the
appropriate wheel hub (see KNUCKLE/HUB
22-
Left-front
REPLACEMENT ).
11
23-
Right-rear
11
Remove the hub bearing unit: Disc brake type (see
HUB BEARING UNIT REPLACEMENT-DISC
BRAKE TYPE ), drum brake type (see HUB
24-
Left-rear
11
BEARING UNIT REPLACEMENT-DRUM
BRAKE TYPE ).
Is the magnetic encoder surface OK?
YES - Replace the wheel bearing (front) or the hub bearing unit (rear):
Front: Replace the front wheel bearing (see KNUCKLE/HUB
REPLACEMENT ).
Rear (disc brake type): Replace the rear hub bearing unit (see HUB
BEARING UNIT REPLACEMENT-DISC BRAKE TYPE ).
Rear (drum brake type): Replace the hub bearing unit (see HUB
BEARING UNIT REPLACEMENT-DRUM BRAKE TYPE ).
NO - Clean off dust or dirt from the appropriate magnetic encoder surface on
the wheel bearing or the hub bearing unit, then go to step 1 and recheck. If the
DTC is still present, replace the appropriate wheel bearing or hub bearing unit.
DTC 31-XX*: ABS RIGHT-FRONT INLET SOLENOID VALVE MALFUNCTION; DTC 32RIGHT-FRONT OUTLET SOLENOID VALVE MALFUNCTION; DTC 33-XX*: ABS LEFT-FRONT
INLET SOLENOID VALVE MALFUNCTION; DTC 34-XX*: ABS LEFT-FRONT OUTLET
SOLENOID VALVE MALFUNCTION; DTC 35-XX*: ABS RIGHT-REAR INLET SOLENOID
VALVE MALFUNCTION; DTC 36-XX*: ABS RIGHT-REAR OUTLET SOLENOID VALVE
MALFUNCTION; DTC 37-XX*: ABS LEFT-REAR INLET SOLENOID VALVE MALFUNCTION;
DTC 38-XX*: ABS LEFT-REAR OUTLET SOLENOID VALVE MALFUNCTION
*:Subcode
Page 44
21:
1.
Raise the vehicle, and support it with safety stands in the proper locations (see
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it ON (II) again.
4. Check for DTCs with the HDS.
SOLENOID VALVE MALFUNCTION
Subcode Malfunction Note (DTC)
Solenoid Initial
31-01,32-01,33-01, 34-01,35-01,36-01, 37-
01
Pulse
01,38-01
31-21,32-21,33-21, 34-21,35-21,36-21, 37-
21 Solenoid Pulse
21,38-21
Solenoid
31-22,32-22, 33-22, 34-22,35-22,36-22, 37-22,
22
Speculative
38-22
31-23, 32-23, 33-23, 34-23, 35-23, 36-23, 37-
23 Solenoid Stuck ON
23, 38-23
Is DTC 31-xx, 32-xx, 33-xx, 34-xx, 35-xx, 36-xx, 37-xx, or 38-xx indicated?
YES - Replace the ABS modulator-control unit: Except Si model (see
REMOVAL
- EXCEPT SI MODEL ), Si model (see REMOVAL - SI
MODEL ).
NO - Intermittent failure, the system is OK at this time.
DTC 41-21: RIGHT-FRONT WHEEL LOCK; DTC 42-21: LEFT-FRONT WHEEL LOCK; DTC 43RIGHT-REAR WHEEL LOCK; DTC 44-21: LEFT-REAR WHEEL LOCK
The DTCs may be indicated under these conditions:
The vehicle goes into a spin.
The ABS continues to operate for a long time.
Snow build-up on the wheel sensor.
Misadjusted brake switch
Contaminated brake fluid
Page 45
LIFT AND SUPPORT POINTS
3.
Turn the ignition switch to LOCK (0), then turn it ON (II) again.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
2. Turn the appropriate wheel by hand.
APPROPRIATE WHEEL
DTC Appropriate Wheel
41-21 Right-front
42-21 Left-front
43-21 Right-rear
44-21 Left-rear
Is there brake drag?
).
YES - Repair the brake drag.
NO - Go to step 3.
3. Check that the appropriate wheel sensor is properly mounted (see WHEEL
SENSOR REPLACEMENT ).
Is the wheel sensor installation OK?
YES - Intermittent failure, the system is OK at this time. Check for loose
terminals between the wheel sensor 2P connector and the ABS modulatorcontrol unit 25P connector. Refer to INTERMITTENT FAILURES
TROUBLESHOOTING . If the vehicle continues to code, replace the ABS
modulator-control unit: Except Si model (see REMOVAL - EXCEPT SI
MODEL ), Si model (see REMOVAL - SI MODEL ).
NO - Reinstall the wheel sensor, and check the mounting position (see
WHEEL SENSOR REPLACEMENT ).
DTC 51-11: MOTOR LOCK; DTC 51-13: MOTOR RELAY OFF MALFUNCTION
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
Page 46
- Reinstall the checked fuse, then go to step
9.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
4. Wait 5 seconds.
5. Operate each SOLENOID in the ABS FUNCTION TEST five times with the
HDS.
6. Check for DTCs with the HDS.
Is DTC 51-11 or 51-13 indicated?
YES - Replace the ABS modulator-control unit: Except Si model (see
REMOVAL
- EXCEPT SI MODEL ), Si model (see REMOVAL - SI
MODEL ).
NO - Intermittent failure, the system is OK at this time.
DTC 51-12: MOTOR LOCK CIRCUIT MALFUNCTION
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it ON (II) again.
4. Check for DTCs with the HDS.
Is DTC 51-12 indicated?
YES - Go to step 5.
NO - Intermittent failure, the system is OK at this time. Check for loose
terminals at the ABS modulator-control unit 25P connector. Refer to
INTERMITTENT FAILURES TROUBLESHOOTING
5. Turn the ignition switch to LOCK (0).
6. Check the No. 3 MTR (30 A) fuse in the under-hood fuse/relay box.
Is the fuse blown?
YES - Go to step 7.
NO
.
Page 47
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
7. Disconnect the ABS modulator-control unit 25P connector.
8. Check for continuity between ABS modulator-control unit 25P connector
terminal No. 9 and body ground.
Fig. 20: Checking Continuity Between ABS Modulator
-Control Unit 25P
Connector Terminal No. 9 And Body Ground
Is there continuity?
YES - Repair short to body ground in the wire between the No. 3 MTR (30 A)
fuse in the understood fuse/relay box and the ABS modulator-control unit.
NO - Install a new No. 3 MTR (30 A) fuse in the under-hood fuse/relay box,
then go to step 10.
9. Disconnect the ABS modulator-control unit 25P connector.
10. Measure voltage between ABS modulator-control unit 25P connector terminal
No. 9 and body ground.
Fig. 21: Measuring Voltage Between ABS Modulator
-Control Unit 25P
Page 48
Connector Terminal No. 9 And Body Ground
Is DTC 53
-
01 or 53
-
12 indicated?
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Is there battery voltage?
YES - Check for loose terminals in the ABS modulator-control unit 25P
connector. If necessary, substitute a known-good ABS modulator-control unit:
Except Si model (see REMOVAL
- EXCEPT SI MODEL ), Si model (see
REMOVAL - SI MODEL ), and retest.
NO - Repair open in the wire between the No. 3 MTR (30 A) fuse in the under-
hood fuse/relay box and the ABS modulator-control unit.
DTC 52-12: MOTOR STUCK OFF
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it ON (II) again.
4. Operate each SOLENOID in the ABS FUNCTION TEST five times with the
HDS.
5. Check for DTCs with the HDS.
Is DTC 52-12 indicated?
YES - Replace the ABS modulator-control unit: Except Si model (see
REMOVAL
- EXCEPT SI MODEL ), Si model (see REMOVAL - SI
MODEL ).
NO - Intermittent failure, the system is OK at this time.
DTC 53-01: MOTOR RELAY STUCK ON 1; DTC 53-12: MOTOR RELAY STUCK ON 2
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it ON (II) again.
4. Check for DTCs with the HDS.
Page 49
YES
3.
Turn the ignition switch to LOCK (0), then turn it ON (II) again.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
- Go to step 5.
NO - Intermittent failure, the system is OK at this time. Check for loose
terminals at the ABS modulator-control unit 25P connector. Refer to
INTERMITTENT FAILURES TROUBLESHOOTING .
5. Turn the ignition switch to LOCK (0).
6. Disconnect the ABS modulator-control unit 25P connector.
7. Check for continuity between ABS modulator-control unit 25P connector
terminal No. 25 and body ground.
Fig. 22: Checking Continuity Between ABS Modulator
Connector Terminal No. 25 And Body Ground
Is there continuity?
YES - Check for loose terminals in the ABS modulator-control unit 25P
connector. If necessary, substitute a known-good ABS modulator-control unit:
Except Si model (see REMOVAL - EXCEPT SI MODEL ), Si model (see
REMOVAL - SI MODEL ), and retest.
NO - Repair open in the wire between the ABS modulator-control unit and
body ground (G202).
DTC 54-03: FAIL-SAFE RELAY 1 STUCK ON
1. Turn the ignition switch ON (II).
2. Cl
ear the DTC with the HDS.
-Control Unit 25P
Page 50
8.
Check for continuity between ABS modulator
-
control unit 25P connector
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
4. Check for DTCs with the HDS.
Is DTC 54-03 indicated?
YES - Replace the ABS modulator-control unit: Except Si model (see
REMOVAL
- EXCEPT SI MODEL ), Si model (see REMOVAL - SI
MODEL ).
NO - Intermittent failure, the system is OK at this time.
DTC 54-04: FAIL-SAFE RELAY 1 STUCK OFF (INITIAL); DTC 54-21: FAIL-SAFE RELAY 1
STUCK OFF (MAIN)
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it ON (II) again.
4. Check for DTCs with the HDS.
Is DTC 54-04 or 54-21 indicated?
YES - Go to step 5.
NO - Intermittent failure, the system is OK at this time. Check for loose
terminals at the ABS modulator-control unit 25P connector. Refer to
INTERMITTENT FAILURES TROUBLESHOOTING
5. Turn the ignition switch to LOCK (0).
6. Check the No. 3 FSR (30 A) fuse in the under-hood fuse/relay box.
Is the fuse blown?
YES - Go to step 7.
NO - Reinstall the checked fuse, then go to step 9.
7. Disconnect the ABS modulator-control unit 25P connector.
(see ).
Page 51
Is there battery voltage?
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
terminal No. 8 and body ground.
2008 Honda Civic GX
Fig. 23: Checking Continuity Between ABS Modulator
-Control Unit 25P
Connector Terminal No. 8 And Body Ground
Is there continuity?
YES - Repair short to body ground in the wire between the No. 3 FSR (30 A)
fuse in the under-hood fuse/relay box and the ABS modulator-control unit.
NO - Install a new No. 3 FSR (30 A) fuse in the under-hood fuse/relay box,
then go to step 10.
9. Disconnect the ABS modulator-control unit 25P connector.
10. Measure voltage between ABS modulator-control unit 25P connector terminal
No. 8 and body ground.
Fig. 24: Measuring Voltage Between ABS Modulator
Connector Terminal No. 8 And Body Ground
-Control Unit 25P
Page 52
YES
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
- Check for loose terminals in the ABS modulator-control unit 25P
connector. If necessary, substitute a known-good ABS modulator-control unit:
Except Si model (see REMOVAL - EXCEPT SI MODEL ), Si model (see
REMOVAL - SI MODEL ), and retest.
NO - Repair open in the wire between the No. 3 FSR (30 A) fuse in the under-
hood fuse/relay box and the ABS modulator-control unit.
DTC 61-01: MODULATOR-CONTROL UNIT INITIAL IG LOW VOLTAG
MODULATOR-CONTROL UNIT POWER SOURCE LOW VOLTAGE 1; DTC 61-22: MODULATORCONTROL UNIT POWER SOURCE LOW VOLTAGE 2; DTC 61-23: MODULATOR-CONTROL
UNIT POWER SOURCE LOW VOLTAGE 3
E; DTC 61-21:
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then start the engine.
4. Check for DTCs with the HDS.
Is DTC 61-01, 61-21, 61-22, or 61-23 indicated?
YES - Go to step 5.
NO - Intermittent failure, the system is OK at this time. Check for loose
terminals at the ABS modulator-control unit 25P connector. Refer to
INTERMITTENT FAILURES TROUBLESHOOTING
.
5. Check and note BATTERY voltage in the ABS DATA LIST with the HDS. If
6. Using a voltmeter, measure and note the voltage between the battery terminals.
the voltage listed is 0 V, go to step 8, otherwise go to step 6.
NOTE: If the voltage is below 9.5 V, check the battery (see
BATTERY TEST ), and troubleshoot the alternator
regulator circuit: Except Si model (see ALTERNATOR
AND REGULATOR CIRCUIT TROUBLESHOOTING ), Si
model (see ALTERNATOR AND REGULATOR CIRCUIT
TROUBLESHOOTING ).
Page 53
- Repair open in the wire between the No. 3 FSR (30 A) fuse in the under
-
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
7. Compare the voltage noted in step 5 to the voltage in step 6.
Is the difference between the two voltage readings less then 3 V?
YES - Intermittent failure, the system is OK at this time. Check for loose
terminals at the ABS modulator-control unit 25P connector. Refer to
INTERMITTENT FAILURES TROUBLESHOOTING
. If the code resets
after clearing, replace the ABS modulator-control unit: Except Si model (see
REMOVAL - EXCEPT SI MODEL ), Si model (see REMOVAL - SI
MODEL ).
NO - Check for loose terminals in the ABS modulator-control unit 25P
connector. If necessary, substitute a known-good ABS modulator-control unit:
Except Si model (see REMOVAL - EXCEPT SI MODEL ), Si model (see
REMOVAL - SI MODEL ), and retest.
8. Turn the ignition switch to LOCK (0).
9. Disconnect the ABS modulator-control unit 25P connector.
10. Measure voltage between ABS modulator-control unit 25P connector terminal
No. 8 and body ground.
Fig. 25: Measuring Voltage Between ABS Modulator
-Control Unit 25P
Connector Terminal No. 8 And Body Ground
Is there battery voltage?
YES - Go to step 11.
NO
Page 54
- Go to step 5.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
hood fuse/relay box and the ABS modulator-control unit.
11. Turn the ignition switch ON (II).
12. Measure voltage between ABS modulator-control unit 25P connector terminal
No. 16 and body ground.
Fig. 26: Measuring Voltage Between ABS Modulator
-Control Unit 25P
Connector Terminal No. 16 And Body Ground
Is there battery voltage?
YES - Check for loose terminals in the ABS modulator-control unit 25P
connector. If necessary, substitute a known-good ABS modulator-control unit:
Except Si model (see REMOVAL
- EXCEPT SI MODEL ), Si model (see
REMOVAL - SI MODEL ), and retest.
NO - Repair open in the wire between the No. 4 (7.5 A) fuse in the under-dash
fuse/relay box and the ABS modulator-control unit.
DTC 62-21: MODULATOR-CONTROL UNIT IG HIGH VOLTAGE
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then start the engine.
4. Check for DTCs with the HDS.
Is DTC 62-21 indicated?
YES
Page 55
NO
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
- Intermittent failure, the system is OK at this time.
5. Using a voltmeter, measure the voltage between the battery terminals.
Compare the voltage measured at the battery with the voltage shown in the
ABS DATA LIST with the HDS.
Is there a voltage difference of 3 V or more?
YES - Replace the ABS modulator-control unit: Except Si model (see
REMOVAL
- EXCEPT SI MODEL ), Si model (see REMOVAL - SI
MODEL ), and retest.
NO - Check the battery (see BATTERY TEST ), and troubleshoot the
alternator regulator circuit: Except Si model (see ALTERNATOR AND
REGULATOR CIRCUIT TROUBLESHOOTING ), Si model (see
ALTERNATOR AND REGULATOR CIRCUIT
TROUBLESHOOTING ). Also check for loose terminals in the ABS
modulator-control unit 25P connector. If it is OK, replace the ABS modulatorcontrol unit: Except Si model (see REMOVAL - EXCEPT SI MODEL ), Si
model (see REMOVAL
DTC 71-21: RIGHT-FRONT OR LEFT-REAR DIFFERENT DIAMETER TIRE MALFUNCTION;
DTC 71-22: LEFT-FRONT OR RIGHT-REAR DIFFERENT DIAMETER TIRE MALFUNCTION;
DTC 71-23: RIGHT-FRONT AND RIGHT-REAR DIFFERENT DIAMETER TIRE MALFUNCTION;
DTC 71-24: LEFT-FRONT AND LEFT-REAR DIFFERENT DIAMETER TIRE MALFUNCTION;
DTC 71-25: RIGHT-FRONT AND LEFT-FRONT DIFFERENT DIAMETER TIRE MALFUNCTION;
DTC 71-26: RIGHT-REAR AND LEFT-REAR DIFFERENT DIAMETER TIRE MALFUNCTION
- SI MODEL ).
NOTE: The DTC will be indicated when the vehicle has a different
DIFFERENT DIAMETER TIRE MALFUNCTION
diameter tire(s) compared to the other tire(s).
DTC Sectional Note
71-21 Right-front or left-rear
71-22 Left-front or right-rear
71-23 Right-front and right-rear
71-24 Left-front and left-rear
Page 56
- Intermittent failure, the system is OK at this time.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
71-25 Right-front and left-front
71-26 Right-rear and left-rear
1. Check the tires for proper inflation (see WHEEL ALIGNMENT ).
2. Turn the ignition switch ON (II).
3. Clear the DTC with the HDS.
4. Turn the ignition switch to LOCK (0).
5. Test-drive the vehicle.
6. Check for DTCs with the HDS.
Is DTC 71-21, 71-22, 71-23, 71-24, 71-25, or 71-26 indicated?
YES - Replace all four tires with the proper size (see WHEEL
ALIGNMENT ).
NO - Intermittent failure, the system is OK at this time.
DTC 81-XX*: CENTRAL PROCESSING UNIT (CPU) INTERNAL CIRCUIT MALFUNCTION
* : Subcode (Except DTC 81-11, 81-51, and 81-52)
1. Tu
rn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it ON (II) again.
4. Check for DTCs with the HDS.
Is DTC 81-xx indicated?
YES - If the DTC 81-11, 81-51, or 81-52 is indicated at the same time, do the
DTC 81-11,81-51, or 81-52 troubleshooting (see DTC 81-xx*: Central
Processing Unit (CPU) Internal Circuit Malfunction ). If DTC 81-11, 8151, or 81-52 is not indicated, replace the ABS modulator-control unit: Except
Si model (see REMOVAL - EXCEPT SI MODEL ), Si model (see
REMOVAL
NO
- SI MODEL ), and retest.
Page 57
DTC 81
-
11: CENTRAL PROCESSING UNIT (CPU) INTERNAL CIRCUIT MALFUNCTION; DTC 81
-
7.
Disconnect ECM/PCM connector A (44P).
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
51: CENTRAL PROCESSING UNIT (CPU) INTERNAL CIRCUIT MALFUNCTION; DTC 81-52:
CENTRAL PROCESSING UNIT (CPU) INTERNAL CIRCUIT MALFUNCTION
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Test-drive the vehicle.
5. Check for DTCs with the HDS.
Is DTC 81-11, 81-51, or 81-52 indicated?
YES - Replace the ABS modulator-control unit: Except Si model (see
REMOVAL
- EXCEPT SI MODEL ), Si model (see REMOVAL - SI
MODEL ).
NO - Intermittent failure, the system is OK at this time.
DTC 86-01: F-CAN BUS-OFF MALFUNCTION
1. Turn the ignition switch ON (II).
2. Cl
ear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it ON (II) again.
4. Check for DTCs with the HDS.
Is DTC 86-01 indicated?
YES - Go to step 5.
NO - Intermittent failure, the system is OK at this time. Check for loose
terminals between ECM/PCM connector A (44P) and the ABS modulatorcontrol unit 25P connector. Refer to INTERMITTENT FAILURES
TROUBLESHOOTING .
5. Turn the ignition switch to LOCK (0).
6. Short the SCS line with the HDS.
Page 58
unit 25P connector terminals No. 1 and No. 17 individually.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
8. Disconnect the HDS from the data link connector (DLC).
9. Disconnect the gauge control module (tach) 36P connector.
10. Disconnect SRS unit connector A (28P).
11. With EPS: Disconnect EPS control unit connector D (28P).
12. With TPMS: Disconnect the TPMS control unit 20P connector.
13. Disconnect the ABS modulator-control unit 25P connector.
14. Check for continuity between the ABS modulator-control unit 25P connector
terminals No. 1 and No. 17 and body ground individually.
Fig. 27: Checking Continuity Between ABS Modulator
-Control Unit 25P
Connector Terminals No. 1 And No. 17 And Body Ground
Is there continuity?
YES - Repair short to body ground in the wire between the ECM/PCM, the
gauge control module (tach), the data link connector (DLC), the SRS unit, the
EPS control unit (if equipped), the TPMS control unit (if equipped), and the
ABS modulator-control unit.
NO - Go to step 15.
15. Check for continuity between body ground and the ABS modulator-control
Page 59
CONTROL UNIT 25P CONNECTOR TERMINAL AND
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 28: Checking Continuity Between ABS Modulator-Control Unit 25P
Connector Terminals No. 1 And No. 17
Is there continuity?
YES - Repair short in the wires between ABS modulator-control unit 25P
connector terminals No. 1 (CAN-H line) and No. 17 (CAN-L line).
NO - Go to step 16.
16. Check for continuity between ABS modulator-control unit 25P connector
terminal and ECM/PCM connector A (44P) terminal (see ABS
MODULATORECM/PCM CONNECTOR A (44P) TERMINAL ).
ABS MODULATOR-CONTROL UNIT 25P CONNECTOR TERMINAL
AND ECM/PCM CONNECTOR A (44P) TERMINAL
Connector Terminal No.
Sign
ABS Modulator-control UnitECM/PCM
CAN-L 17 37
CAN-H 1 36
Page 60
Is 86
-
24, and/or 86
-
25 DTC indicated?
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 29: Checking Continuity Between ABS Modulator-Control Unit 25P
Connector Terminal And ECM/PCM Connector A (44P) Terminal
Is there continuity?
YES - Check for loose terminals in the ABS modulator-control unit 25P
connector. If necessary, substitute a known-good ABS modulator-control unit:
Except Si model (see REMOVAL
- EXCEPT SI MODEL ), Si model (see
REMOVAL - SI MODEL ), and retest.
NO - Repair open in the wire between the ECM/PCM and the ABS modulator-
control unit.
DTC 86-24: F-CAN COMMUNICATION WITH ENGINE MALFUNCTION; DTC 86-25: F-CAN
COMMUNICATION WITH ENGINE MALFUNCTION
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Test-drive the vehicle. Drive the vehicle at 7 mph (10 km/h) or more.
5. Check for DTCs with the HDS.
Page 61
YES
CONTROL UNIT 25P CONNECTOR TERMINAL AND
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
- Go to step 6.
NO - Intermittent failure, the system is OK at this time. Check for loose
terminals between ECM/PCM connector A (44P) and the ABS modulatorcontrol unit 25P connector. Refer to INTERMITTENT FAILURES
TROUBLESHOOTING .
6. Turn the ignition switch to LOCK (0).
7. Short the SCS line with the HDS.
8. Disconnect ECM/PCM connector A (44P).
9. Disconnect the ABS modulator-control unit 25P connector.
10. Check for continuity between ABS modulator-control unit 25P connector
terminal and ECM/PCM connector A (44P) terminal (see ABS
MODULATORECM/PCM CONNECTOR A (44P) TERMINAL ).
ABS MODULATOR-CONTROL UNIT 25P CONNECTOR TERMINAL
AND ECM/PCM CONNECTOR A (44P) TERMINAL
Connector Terminal No.
Sign
ABS Modulator-control UnitECM/PCM
CAN-L 17 37
CAN-H 1 36
Page 62
4.
Check for DTCs with the HDS.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 30: Checking Continuity Between ABS Modulator-Control Unit 25P
Connector Terminal And ECM/PCM Connector A (44P) Terminal
Is there continuity?
YES - Check for loose terminals in ECM/PCM connector A (44P) and at ABS
modulator-control unit 25P connector. If necessary, substitute a known-good
ECM/PCM, then go to step 1 and recheck. If no DTCs are indicated, replace
the original ECM/PCM: Except Si model (see ECM/PCM
REPLACEMENT ), Si model (see ECM REPLACEMENT ). If DTCs are
indicated, replace the ABS modulator-control unit: Except Si model (see
REMOVAL - EXCEPT SI MODEL ), Si model (see REMOVAL - SI
MODEL ).
NO - Repair open in the wire between the ECM/PCM and the ABS modulator-
control unit.
DTC 86-FF: F-CAN COMMUNICATION WITH ABS MALFUNCTION
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it ON (II) again.
Page 63
), and retest.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Is DTC 86-FF Indicated?
YES - Replace the ABS modulator-control unit: Except Si model (see
REMOVAL - EXCEPT SI MODEL ), Si model (see REMOVAL - SI
MODEL ).
NO - Intermittent failure, the system is OK at this time.
SYMPTOM TROUBLESHOOTING
ABS INDICATOR DOES NOT GO OFF, AND NO DTCS ARE STORED
1. C
heck for the communication between the vehicle and the HDS.
Is there the communication?
YES - Check for loose terminals in the gauge control module (tach) 36P
connector. If necessary, substitute a known-good gauge control module (tach),
then recheck. If it is OK, replace the original gauge control module (tach) (see
TACHOMETER ).
NO - If the HDS does not communicate with all the systems of the vehicle,
troubleshoot the DLC circuit: Except Si model (see DLC CIRCUIT
TROUBLESHOOTING ), Si model (see DLC CIRCUIT
TROUBLESHOOTING ). If the HDS does not communicate with only ABS,
go to step 2.
2. Turn the ignition switch to LOCK (0).
3. Check the No. 4 (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse blown?
YES - Install the new No. 4 (7.5 A) fuse, and recheck. If the fuse continues to
blow, check for short to body ground in the wire between the No. 4 (7.5 A)
fuse in the under-dash fuse/relay box and the ABS modulator-control unit. If
necessary, substitute a known-good ABS modulator-control unit: Except Si
model (see REMOVAL
REMOVAL - SI MODEL
- EXCEPT SI MODEL ), Si model (see
Page 64
NO
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
- Reinstall a checked fuse, then go to step 4.
4. Disconnect the ABS modulator-control unit 25P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between ABS modulator-control unit 25P connector terminal
No. 16 and body ground.
Fig. 31: Measuring Voltage Between ABS Modulator
-Control Unit 25P
Connector Terminal No. 16 And Body Ground
Is there battery voltage?
YES - Go to step 7.
NO - Repair open in the wire between the No. 4 (7.5 A) fuse in the under-dash
fuse/relay box and the ABS modulator-control unit.
7. Turn the ignition switch to LOCK (0).
8. Check for continuity between ABS modulator-control unit 25P connector
terminal No. 24 and body ground.
Fig. 32: Checking Continuity Between ABS Modulator
Connector Terminal No. 24 And Body Ground
-Control Unit 25P
Page 65
terminals between the gauge control module (tach) 36P connector and the ABS
), and retest.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Is there continuity?
YES - Check for loose terminals in the ABS modulator-control unit 25P
connector, clean terminal G202 and recheck. If necessary, substitute a knowngood ABS modulator-control unit: Except Si model (see REMOVAL -
EXCEPT SI MODEL
), Si model (see REMOVAL - SI MODEL ), and
retest.
NO - Repair open in the wire between the ABS modulator-control unit and
body ground (G202).
BRAKE SYSTEM INDICATOR DOES NOT GO OFF, AND NO DTCS ARE STORED
1. Release the parking brake.
2. Turn the ignition switch ON (II).
3. Check the brake system indicator for several seconds when the ignition switch
is turned ON (II).
Does the indicator come on then go off?
YES - Intermittent failure, the system is OK at this time. Check for loose
modulator-control unit 25P connector. Refer to INTERMITTENT
FAILURES TROUBLESHOOTING .
NO - Go to step 4.
4. Check the BRAKE INDICATOR in the ABS DATA LIST with the HDS.
Does it indicate OFF?
YES - Go to step 5.
NO - Check for loose terminals in the ABS modulator-control unit 25P
connector. If necessary, substitute a known-good ABS modulator-control unit:
Except Si model (see REMOVAL
- EXCEPT SI MODEL ), Si model (see
REMOVAL - SI MODEL
Page 66
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
5. Turn the ignition switch to LOCK (0).
6. Check the brake fluid level in the master cylinder reservoir tank.
Is brake fluid level OK?
YES - Go to step 7.
NO - Do the brake pad inspection: Front (except Si model) (see
INSPECTION
- EXCEPT SI MODEL ), front (Si model) (see
INSPECTION - SI MODEL ), rear (disc brake type) (see REAR BRAKE
PAD INSPECTION AND REPLACEMENT ), and add the brake fluid, then
go to step 1 and recheck.
7. Disconnect the brake fluid level switch 2P connector.
8. Turn the ignition switch ON (II).
Does the brake system indicator go off?
YES - Replace the brake fluid reservoir tank (brake fluid level switch is
included) (see MASTER CYLINDER INSPECTION
).
NO - Go to step 9.
9. Turn the ignition switch to LOCK (0).
10. Disconnect the gauge control module (tach) 36P connector.
11. Check for continuity between brake fluid level switch 2P connector terminal
No. 2 and body ground.
Page 67
Fig. 33: Checking Continuity Between Brake Fluid Level Switch 2P
Connector Terminal No. 1 And Body Ground
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Connector Terminal No. 2 And Body Ground
Is there continuity?
YES - Repair short to body ground in the wire between the gauge control
module (tach) and the brake fluid level switch.
NO - Go to step 12.
12. Reconnect the gauge control module (tach) 36P connector.
13. Disconnect the parking brake switch IP connector.
14. Turn the ignition switch ON (II).
Does the brake system indicator go off?
YES - Replace the parking brake switch (see PARKING BRAKE CABLE
REPLACEMENT ).
NO - Go to step 15.
15. Turn the ignition switch to LOCK (0).
16. Disconnect the gauge control module (tach) 36P connector.
17. Check for continuity between parking brake switch 1P connector terminal No.
1 and body ground.
Fig. 34: Checking Continuity Between Brake Fluid Level Switch 2P
Page 68
terminals between the gauge control module (tach) 36P connector and the ABS
8.
Disconnect the gauge control module (tach) 36P connector.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Is there continuity?
YES - Repair short to body ground in the wire between the gauge control
module (tach) and the parking brake switch.
NO - Check for loose terminals in the gauge control module (tach) 36P
connector. If necessary, substitute a known-good gauge control module (tach),
then go to step 1 and recheck. If it is OK, replace the original gauge control
module (tach) (see TACHOMETER
ABS INDICATOR AND BRAKE SYSTEM INDICATOR DO NOT GO OFF AT THE SAME TIME
).
NOTE: Check for gauge DTCs with the HDS (see HOW TO CHECK
FOR DTCS WITH THE HONDA DIAGNOSTIC SYSTEM
(HDS) ). If gauge DTCs are stored, troubleshoot those DTCs
first.
1. Release the parking brake.
2. Turn the ignition switch ON (II).
3. Check the ABS indicator and the brake system indicator for several seconds
when the ignition switch is turned ON (II).
Do the indicators come on then go off?
YES - Intermittent failure, the system is OK at this time. Check for loose
modulator-control unit 25P connector. Refer to INTERMITTENT
FAILURES TROUBLESHOOTING .
NO - Go to step 4.
4. Turn the ignition switch to LOCK (0).
5. Short the SCS line with the HDS.
6. Disconnect ECM/PCM connector A (44P).
7. Disconnect the HDS from the data link connector (DLC).
Page 69
terminals No. 1 and No. 17.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
9. Disconnect SRS unit connector A (28P).
10. With EPS: Disconnect EPS control unit connector D (28P).
11. With TPMS: Disconnect the TPMS control unit 20P connector.
12. Disconnect the ABS modulator-control unit 25P connector.
13. Check for continuity between the ABS modulator-control unit 25P connector
terminals No. 1, and No. 17 and body ground individually.
Fig. 35: Checking Continuity Between ABS Modulator
-Control Unit 25P
Connector Terminals No. 1 & No. 17 And Body Ground
Is there continuity?
YES - Repair short to body ground in the wire between the ECM/PCM, the
gauge control module (tach), the data link connector (DLC), the SRS unit, the
EPS control unit (if equipped), the TPMS control unit (if equipped), and the
ABS modulator-control unit.
NO - Go to step 14.
14. Check for continuity between ABS modulator-control unit 25P connector
Page 70
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 36: Checking Continuity Between ABS Modulator-Control Unit 25P
Connector Terminals No. 1 And No. 17
Is there continuity?
YES - Repair short in the wire between ABS modulator-control unit 25P
connector terminals No. 1 (CAN-H line) and No. 17 (CAN-L line).
NO - Go to step 15.
15. Check for continuity between ABS modulator-control unit 25P connector
terminal and gauge control module (tach) 36P connector terminal (see table).
ABS MODULATOR-CONTROL UNIT 25P CONNECTOR TERMINAL
AND GAUGE CONTROL MODULE (TACH) 36P CONNECTOR
TERMINAL
Connector Terminal No.
Sign
ABS Modulator-control UnitGauge Control Module (Tach)
CAN-L 17 19
CAN-H 1 1
Page 71
). If DTCs are indicated, replace the ABS
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 37: Checking Continuity Between ABS Modulator-Control Unit 25P
Connector Terminal And Gauge Control Module (Tach) 36P Connector
Terminal
Is there continuity?
YES - Check for loose terminals in the gauge control module (tach) 36P
connector. If necessary, substitute a known-good gauge control module (tach),
then go to step 1 and recheck. If it is OK, replace the original gauge control
module (tach) (see TACHOMETER
modulator-control unit: Except Si model (see REMOVAL - EXCEPT SI
MODEL ), Si model (see REMOVAL - SI MODEL ).
NO - Repair open in the wire between the gauge control module (tach) and the
ABS modulator-control unit.
ABS MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION
NOTE:
Do not spill brake fluid on the vehicle; it may damage
the paint; if brake fluid gets on the paint, wash it off
immediately with water.
Be careful not to damage or deform the brake lines
during removal and installation.
To prevent the brake fluid from flowing, plug and cover
hose ends and joints with a shop towel or
the
equivalent material.
Page 72
REMOVAL
-
EXCEPT SI MODEL
body.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
1. Disconnect the ABS modulator-control unit 25P connector (A) by pulling up
the lock (B); the connector disconnects itself.
Fig. 38: Removal And Installation Of ABS Modulator
Specifications)
2. Disconnect the six brake lines from the ABS modulator-control unit.
NOTE: Brake lines are connected to the master cylinder (C)
3. Remove the ABS modulator-control unit (H) with the bracket (I) from the
-Control Unit (With
and to the right-front (D), the left-rear (E), the right-rear
(F) and the left-front (G) brake system.
Page 73
Reconnect the six brake lines, then tighten the flare nuts to the specified torque.
control unit 25P connector, then confirm
the lock (B); the connector disconnects itself.
If the brake pedal is spongy, there may be air trapped in
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
4. Remove the ABS modulator-control unit from the bracket.
INSTALLATION - EXCEPT SI MODEL
1. Install the ABS modulator-control unit on the bracket.
2. Install the bracket with the ABS modulator-control unit to the body.
3.
4. Align the connecting surface of the ABS modulator-control unit 25P connector
to the ABS modulator-control unit.
5. Lower the lock of the ABS modulatorthe connector is fully seated.
6. Bleed the brake system (see BRAKE SYSTEM BLEEDING ).
7. Start the engine, and check that the ABS indicator goes off.
8. Test-drive the vehicle, and check that the ABS indicator does not come on.
NOTE:
the modulator and then induced into the normal brake
system during modulation. Bleed the brake system
again (see BRAKE SYSTEM BLEEDING
REMOVAL - SI MODEL
1. Disconnect the ABS modulator-control unit 25P connecto
).
r (A) by pulling up
Page 74
Control Unit 25P Connector (With
5.
Separate the bracket if necessary.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 39: Disconnecting ABS ModulatorSpecifications)
2. Disconnect the six brake lines from the ABS modulator-control unit.
NOTE: Brake lines are connected to the master cylinder (C)
and to the right-front (D), the left-rear (E), the right-rear
(F) and the left-front (G) brake system.
3. Remove the ABS modulator-control unit (H) with the brackets (I) from the
body.
4. Remove the ABS modulator-control unit from the brackets.
Page 75
INSTALLATION
-
SI MODEL
Reconnect the six brake lines, then tighten the flare nuts to the specified torque.
control unit 25P connector, then confirm
1.
Release the clamp (A), then disconnect the wheel sensor connector (B).
If the brake pedal is spongy, there may be air trapped in
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
1. Install the ABS modulator-control unit on the brackets.
2. Install the bracket with the ABS modulator-control unit to the body.
3.
4. Align the connecting surface of the ABS modulator-control unit 25P connector
to the ABS modulator-control unit.
5. Lower the lock of the ABS modulatorthe connector is fully seated.
6. Bleed the brake system (see BRAKE SYSTEM BLEEDING ).
7. Start the engine, and check that the ABS indicator goes off.
8. Test-drive the vehicle, and check that the ABS indicator does not come on.
NOTE:
the modulator and then induced into the normal brake
system during modulation. Bleed the brake system
again (see BRAKE SYSTEM BLEEDING ).
WHEEL SENSOR REPLACEMENT
FRONT
Page 76
1.
Release the clamp (A), then disconnect the wheel sensor connector (B).
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 40: Disconnecting Wheel Sensor Connector (With Specifications)
2. Remove the clips, the bolt, and the wheel sensor (C).
3. Install the wheel sensor in the reverse order of removal, and note these items:
Install the sensor carefully to avoid twisting the wires.
If the wheel sensor comes in contact with the wheel bearing, it is faulty.
tart the engine, and check that the ABS indicator goes off.
4. S
5. Test-drive the vehicle, and check that the ABS indicator does not come on.
REAR
Page 77
5.
Test
-
drive the vehicle, and check that the ABS indicator does not come on.
2008 Honda Civic GX
2006-08 BRAKES ABS System - Civic (All Except Hybrid)
Fig. 41: Disconnecting Wheel Sensor Connector (With Specifications)
2. Remove the clips, the bolt, and the wheel sensor (C).
3. Install the wheel sensor in the reverse order of removal, and note these items:
Apply multipurpose grease to the O-ring (D).
Install the sensor carefully to avoid twisting the wires.
If the wheel sensor comes in contact with the hub bearing unit, it is faulty.
4. Start the engine, and check that the ABS indicator goes off.
Page 78
2006
-
08 RESTRAINTS
2008 Honda Civic EX
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
SRS (Supplemental Restraint System) - Civic (Except Hybrid)
COMPONENT LOCATION INDEX
4-door
Fig. 1: Identifying Supplemental Restraint System Component Location 4
Door (1 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
-
Page 79
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Fig. 2: Identifying Supplemental Restraint System Component Location 4Door (2 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
2-door
Page 80
Courtesy of AMERICAN HONDA MOTOR CO., INC.
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Fig. 3: Identifying Supplemental Restraint System Component Location 2Door (1 Of 2)
Page 81
Please read the following precautions carefully before performing the airbag system
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Fig. 4: Identifying Supplemental Restraint System Component Location 2Door (2 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
PRECAUTIONS AND PROCEDURES
GENERAL PRECAUTIONS
service. If the instructions described in this article, or the airbags could accidentally
deploy and cause damage or injuries.
Except when performing electrical inspections, always turn the ignition switch
OFF, disconnect the negative cable from the battery, then wait for 3 minutes
before starting work.
NOTE: The SRS memory is not cleared even if the ignition
switch is turned OFF or the battery cables are
disconnected from the battery.
Page 82
Carefully inspect any SRS part before you install it. Do not install any part that
STEERING
-
RELATED PRECAUTIONS
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Use replacement parts which are manufactured to the same standards and
quality as the original parts. Do not install used SRS parts. Use only new parts
when making SRS repairs.
shows signs of being dropped or improperly handled, such as dents, cracks or
deformation.
Fig. 5: Precaution For - Handling SRS
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Before disconnecting the SRS unit connectors, always disconnect the
propriate SRS parts connectors.
ap
Use only a digital multimeter to check the system. If it is not a Honda
multimeter, make sure its output is 10 mA (0.01 A) or less when switched to
the lowest value in the ohmmeter range. A tester with a higher output could
cause accidental deployment and possible injury.
Do not put objects on the front passenger's airbag.
The original audio and navigation system has a coded theft protection circuit.
Make sure you have the anti-theft codes for the audio system or the navigation
system (if equipped), then write down the audio presets before disconnecting
the negative cable from the battery.
Before returning the vehicle to the customer, enter the anti-theft codes for the
audio system or the navigation system (if equipped), then enter the audio
presets; set the clock.
Page 83
Cable Reel Alignment
precautions.
or water.
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Misalignment of the cable reel could cause an open in the wiring, making the
SRS system, remote steering wheel controls, and the horn inoperative. Center
the cable reel whenever you do the following (see step 6).
Installation of the steering wheel
Installation of the cable reel
Installation of the steering column
Other steering-related adjustment or installation
Do not disassemble the cable reel.
Do not apply grease to the cable reel.
If the cable reel shows any signs of damage, replace it with a new one. For
ample, if it does not rotate smoothly, replace the cable reel.
ex
AIRBAG HANDLING AND STORAGE
Do not disassemble an airbag. It has no serviceable parts. Once an airbag has been
deployed, it cannot be repaired or reused.
For temporary storage of an airbag during service, observe the following
Store the removed airbag with the pad surface up. Never put anything on the
airbag.
Fig. 6: Precaution For - Store Removed Airbag
Courtesy of AMERICAN HONDA MOTOR CO., INC.
To prevent damage to the airbag, keep it away from any oil, grease, detergent,
Page 84
replacement.
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Fig. 7: Precaution For - Keep It Away From Any Oil, Grease, Detergent,
Or Water
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Store the removed airbag on a secure, flat surface away from any high heat
source (exceeding 200 °F/93 °C).
Fig. 8:
Precaution For - Away From Any High Heat Source
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Never perform electrical inspections to the airbags, such as measuring
resistance.
Do not position yourself in front of the airbag during removal, inspection, or
Page 85
Turn the ignition switch OFF, disconnect the negative cable from the battery
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Fig. 9: Precaution For - Do Not Position Yourself In Front Of Airbag
During Removal, Inspection, Or Replacement
Courtesy of AMERICAN HONDA MOTOR CO., INC.
For proper disposal of a damaged airbag, refer to AIRBAG DISPOSAL .
The side curtain airbag inflator assembly is a long, jointed part containing an
inflator (A), a flexible bag (B), and brackets (C). When removing or installing
the side curtain airbag assembly, never do the following items:
Handle the flexible bag.
Drop the curtain airbag.
Cut, tear, and peel the tapes.
ig. 10: Identifying Side Curtain Airbag Inflator Assembly
F
Courtesy of AMERICAN HONDA MOTOR CO., INC.
SRS UNIT, FRONT AND SIDE IMPACT SENSORS, DRIVER'S SEAT POSITION SENSOR, FRONT
PASSENGER'S WEIGHT SENSORS AND REAR SAFING SENSOR
Page 86
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
then wait for 3 minutes before starting installation or replacement of the SRS
unit, or disconnecting the connectors from the SRS unit.
Be careful not to bump or impact the SRS unit, front impact sensors, side
impact sensors, or rear safing sensor whenever the ignition switch is ON (II),
or for at least 3 minutes after the ignition switch is turned OFF.
During installation or replacement, be careful not to bump (by impact wrench,
ammer, etc.) the area around the SRS unit, front impact sensors, the side
h
impact sensors, or rear safing sensor. The airbags could accidentally deploy
and cause damage or injury.
Fig. 11: Precaution For
- Do Not Bump Around SRS Unit
Courtesy of AMERICAN HONDA MOTOR CO., INC.
After a collision where a front airbag, side airbag or a seat belt tensioner, seat
belt buckle tensioner deployed, go to COMPONENT
REPLACEMENT/INSPECTION AFTER DEPLOYMENT . After a
collision where the airbags did not deploy, inspect for any damage or any
deformation on the SRS unit, front impact sensors, side impact sensors, or rear
safing sensor. If there is any damage, replace the SRS unit and/or the sensors.
Page 87
Fig. 12: Precaution For
-
Inspect For Any Damage Or Any Deformation
Be sure the SRS unit, front impact sensors, side impact sensors, and rear safing
kgf.m, 7.2 lbf.ft). Whenever you remove or replace the SRS unit, safing sensor,
other parts.
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
On SRS Unit
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Do not disassemble the SRS unit, front impact sensors, side impact sensors,
driver's seat position sensor, front passenger's weight sensors, or rear safing
sensor.
sensor are installed securely with the mounting bolts torqued to 9.8 N.m (1.0
or all impact sensors, always install the components with new bolts.
Do not spill water or oil on the SRS unit or the side impact sensors.
WIRING PRECAUTIONS
Some of the SRS wiring can be identified by special yellow outer covering, and the
SRS connectors can be identified by their yellow color. Observe the instructions.
Never attempt to modify, splice, or repair SRS wiring. If there is an open or
damage in SRS wiring, replace the harness.
Fig. 13: Precaution For
- Never Attempt To Modify, Splice, Or Repair
SRS Wiring
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Be sure to install the harness wires so they do not get pinched or interfere with
Page 88
When using electrical test equipment, insert the probe of the tester into the wire
side of the connector. Do not insert the probe of the tester into the terminal side
Use a U
-
shaped probe. Do not insert the probe forcibly.
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Fig. 14: Precaution For - Installing Harness Wires
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Make sure all SRS ground locations are clean, and grounds are securely
fastened for optimum metal-to-metal contact. Poor grounds can cause
intermittent problems that are difficult to diagnose.
PRECAUTIONS FOR ELECTRICAL INSPECTIONS
of the connector, and do not tamper with the connector.
Fig. 15: Precaution For - Do Not Insert Probe Of Tester Into Terminal
Side Of Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Page 89
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Fig. 16: Precaution For - Use U-Shaped Probe And Do Not Insert Probe
Forcibly
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Use specified service connectors in troubleshooting. Using improper tools
could cause an error in inspection due to poor metal-to-metal contact.
SPRING-LOADED LOCK CONNECTOR
Some SRS system connectors have a spring-loaded lock.
Front Airbag Connectors
Disconnecting
To release the lock, pull the spring-loaded sleeve (A) toward the stop (B) while
olding the opposite half of the connector. Then pull the connector halves apart. Be
h
sure to pull on the sleeve and not on the connector.
Fig. 17: Pulling Spring
Courtesy of AMERICAN HONDA MOTOR CO., INC.
-Loaded Sleeve
Page 90
Connecting
side
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
To reconnect, hold the pawl-side connector, and press on the back of the sleeveconnector in the direction shown. As the two connector halves are pressed together,
the sleeve (A) is pushed back by the pawl (B). Do not touch the sleeve.
Fig. 18: Pressing On Back Of Sleeve
-Side Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Side Airbag Connector
Disconnecting
To release the lock, pull the spring-loaded sleeve (A) toward the stop (B) while
olding the opposite half of the connector. Then pull the connector halves apart. Be
h
sure to pull on the sleeve and not on the connector half.
Fig. 19: Disconnecting Side Airbag Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Connecting
Page 91
circuit may need to be open sometimes when diagnosis is done on the system. Insert
to keep the circuit open for diagnosis.
short canceller straight into the cavity from the terminal
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Hold both connector halves, and press them firmly together until the projection (A)
of the sleeve-side connector clicks.
Fig. 20: Connecting Side Airbag Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
OPENING THE SRS UNIT SHORTING CONNECTORS FOR DIAGNOSIS
Special Tools Required
SRS short canceller 070AZ-SAA0100
NOTE:
To prevent damaging of the connector cavity, insert the
side.
Before installing the short canceller, wash it with
electric contact cleaner, then dry it with compressed
air.
Do not use the short canceller if it is damaged.
Make sure to remove the short canceller before
reconnection.
When SRS unit connectors A (28P) or B (28P) are disconnected, a short circuit is
created in the connector by its own function to prevent an airbag deployment. The
the short canceller (070AZ-SAA0100) in the specified cavities when it is necessary
Page 92
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Fig. 21: Identifying SRS Unit Connectors (28P) Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Terminal numbers are shown from the wire side of the female terminals. Insert the
short canceller(s) into the cavities on the terminal side of the connector.
Fig. 22: Identifying SRS Unit Connectors A (28P) Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Page 93
Never put aftermarket accessories on the seat (covers, pads, seat heaters, lights,
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Fig. 23: Identifying SRS Unit Connectors B (28P) Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Seats with Side Airbags
Seats with side airbags have a "SIDE AIRBAG" label on the seat-back.
Fig. 24: Identifying Side Airbag Label
Courtesy of AMERICAN HONDA MOTOR CO., INC.
When cleaning, use a damp cloth to clean the seat. Do not soak the seat with
liquid, and do not spray steam on the seat.
Do not repair a torn or frayed seat-back cover. Replace the seat-back cover.
After a collision where the side airbag was deployed, replace the side airbag
and seat frame with new parts. If the seat-back cushion is split, it must be
replaced.
etc.).
DISCONNECTING SYSTEM CONNECTORS
Page 94
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Turn the ignition switch OFF disconnect the negative cable from the battery, then
wait for 3 minutes before starting the following procedures.
Before disconnecting the cable reel 4P connector (1), disconnect the driver's
airbag 4P connector (2).
Before disconnecting SRS unit connector B from SRS unit, disconnect both
eat belt tensioner 4P connectors and both seat belt buckle tensioner 4P
s
connectors (3, 4, 5,6).
Fig. 25: System Connectors Diagram
Page 95
Courtesy of AMERICAN HONDA MOTOR CO., INC.
dashboard wire harness.
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
1. Turn the ignition switch OFF. Disconnect the negative cable from the battery,
then wait for 3 minutes.
Driver's Airbag
2. Remove the access panel (A) from the steering wheel, then disconnect the
driver's airbag 4P connector (B) from the cable reel.
Fig. 26: Identifying Access Panel And Driver's Airbag 4P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Front Passenger's Airbag
3. Remove the lower glove box, GLOVE BOX REMOVAL/INSTALLATION
then disconnect the front passenger's airbag 4P connector (A) from the
Page 96
airbags.
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Fig. 27: Identifying Front Passenger's Airbag 4P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Side Airbag
4. Disconnect both side airbag 2P connectors (A) from the floor wire harness.
Fig. 28: Identifying Side Airbag 2P Connectors
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Side Curtain Airbag
5. Remove the headliner (see HEADLINER REMOVAL/INSTALLATION ).
6. Disconnect both floor wire harness 2P connectors (A) from the side curtain
Page 97
Disconnect both floor wire harness 4P connectors (A) from the seat belt buckle
tensioner.
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Fig. 29: Identifying Floor Wire Harness 2P Connectors
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Seat Belt Tensioner
7. Remove the seat belt lower anchor (see FRONT SEAT BELT
REPLACEMENT ). Disconnect both floor wire harness 4P connectors (A)
from the seat belt tensioners.
Fig. 30: Identifying Floor Wire Harness 4P Connectors
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Seat Belt Buckle Tensioner
8.
Page 98
Fig. 32: Identifying SRS Unit Connector A (28P) And SRS Unit Connector
troubleshooting, this data can be retrieved via a data link circuit.
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Fig. 31: Identifying Floor Wire Harness 4P Connectors
Courtesy of AMERICAN HONDA MOTOR CO., INC.
SRS Unit
9. Disconnect both seat belt tensioner connectors and both seat belt buckle
tensioner connectors. Remove the center console (see CENTER CONSOLE
REMOVAL/INSTALLATION ). Disconnect SRS unit connector A (28P)
and SRS unit connector B (28P) from the SRS unit.
B (28P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
GENERAL TROUBLESHOOTING INFORMATION
DTC (DIAGNOSTIC TROUBLE CODES)
The self-diagnostic function of the SRS system allows
it to locate the causes of
system problems and then store this information in memory. For easier
Page 99
Whenever the ignition switch is ON (II), or has been turned OFF for less than 3
deploy and cause damage or injuries.
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
When you turn the ignition switch ON (II), the SRS indicator comes on. If it
goes off after 6 seconds, the system is normal, and is not currently detecting
any abnormality.
If there is an abnormality, the system locates and defines the problem, stores
this information in memory, and turns the SRS indicator on. The data will
remain in the memory even when the ignition switch is turned off or if the
battery is disconnected.
The data is stored in memory as a diagnostic trouble code (DTC).
The "x" at the end of each DTC denotes a numeric character (0 thru 9) or an
pha character (A thru F) that is display on the HDS.
al
DTCs are either latching or resetting depending on the malfunction. With
resetting DTCs, the SRS indicator will go off the next time the ignition switch
is turned ON and the system is normal, but the DTC is still stored. With
latching DTCs, the SRS indicator will not turn OFF until the malfunction is
repaired and the DTC is cleared.
When you connect the HDS to the data link connector (DLC), you can retrieve
a more detailed DTC in the Honda Systems "SRS" menu.
NOTE: Only read DTCs from the SRS menu, not from the SWS
menu. SWS (ODS unit) DTCs are subcode of SRS unit
DTCs. Only troubleshoot the corresponding SRS DTCs.
After reading and recording the DTC, proceed with the troubleshooting
rocedure for that code.
p
Precautions
Use only a digital multimeter to check the system. If it's not a Honda
multimeter, make sure its output is 10 mA (0.01 A) or less when switched to
the smallest value in the ohmmeter range. A tester with a higher output could
damage the airbag circuit or cause accidental airbag deployment and possible
injury.
minutes, be careful not to bump the SRS unit; the airbags could accidentally
Page 100
Make sure the HDS communicates with the vehicle and the SRS unit. If it does
2008 Honda Civic EX
2006-08 RESTRAINTS SRS (Supplemental Restraint System) - Civic (Except Hybrid)
Before you remove the dashboard wire harness, floor wire harness, disconnect
the driver's airbag connector, the front passenger's airbag connector, both side
airbag connectors, both side curtain airbag connectors, both seat belt buckle
tensioner connectors and both seat belt tensioner connectors.
Make sure the battery is fully charged. If the battery is dead or low, measuring
alues may not be correct.
v
Do not touch a tester probe to the terminals in the SRS unit or harness
connectors, and do not connect the SRS unit terminals or the sensor terminals
with a jumper wire. Use only the backprobe set and the multimeter. Backprobe
spring-loaded lock type connectors correctly.
READING THE DTC
1. Make sure the ignition switch is OFF.
2. Connect the HDS to the data link connector (DLC) (A).
Fig. 33: Identifying Data Link Connector (DLC)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
3. Turn the ignition switch ON (II).
4.
not communicate, troubleshoot the DLC circuit (see DLC CIRCUIT
TROUBLESHOOTING ).
5. Use the HDS to check for DTCs.
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