STEERING
A
B
SECTION STC
BASIC INSPECTION .................................... 2
DIAGNOSIS AND REPAIR WORKFLOW .......... 2
Work Flow .................................................................2
SYSTEM DESCRIPTION .............................. 3
EPS SYSTEM ...................................................... 3
System Diagram ........................................................3
System Description ...................................................3
Component Parts Location ........................................4
Component Description .............................................5
DTC/CIRCUIT DIAGNOSIS .......................... 6
POWER SUPPLY AND GROUND CIRCUIT ....... 6
Description ................................................................6
Diagnosis Procedure .................................................6
POWER STEERING SOLENOID VALVE ........... 7
Description ................................................................7
Diagnosis Procedure .................................................7
Component Inspection ..............................................8
ENGINE SPEED SIGNAL CIRCUIT .................... 9
Description ................................................................9
Diagnosis Procedure .................................................9
STEERING CONTROL SYSTEM
CONTENTS
ECU DIAGNOSIS INFORMATION ..............14
POWER STEERING CONTROL UNIT ..............14
Reference Value ......................................................14
Fail Safe ..................................................................15
WIRING DIAGRAM ......................................16
ELECTRONICALLY CONTROLLED POWER
STEERING SYSTEM .........................................
Wiring Diagram ........................................................16
SYMPTOM DIAGNOSIS ..............................19
UNBALANCE STEERING WHEEL TURNING
FORCE (TORQUE VARIATION) .......................
Description ...............................................................19
Diagnosis Procedure ...............................................19
PRECAUTION ..............................................20
PRECAUTIONS .................................................20
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .................................................................
UNIT REMOVAL AND INSTALLATION ......21
16
19
20
C
D
E
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STC
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VEHICLE SPEED SIGNAL CIRCUIT .................12
Description ..............................................................12
Diagnosis Procedure ...............................................12
Revision: August 2012 2012 Maxima
EPS CONTROL UNIT .......................................21
Removal and Installation .........................................21
STC-1
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DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow INFOID:0000000007254740
DETAILED FLOW
1.COLLECT THE INFORMATION FROM THE CUSTOMER
It is also important to clarify customer complaints before inspection. First of all, reproduce symptoms, and
understand them fully. Ask customer about his/her complaints carefully. In some cases, it will be necessary to
check symptoms by driving vehicle with customer.
>> GO TO 2.
2.BASIC INSPECTION
1. Check the power steering fluid leakage and the power steering fluid level. Refer to ST-12, "Inspection"
2. Check the drive belt tension. Refer to EM-14, "Checking Drive Belts"
3. Check the power steering gear for damages, cracks and oil leakage. Refer to ST-12, "Inspection"
4. Check the relief oil pressure. Refer to ST-16, "Inspection"
>> GO TO 3.
.
.
3.TROUBLE DIAGNOSIS FOR SYMPTOM
Perform the diagnosis by symptom. Refer to STC-19, "Description"
>> GO TO 4.
.
4.FINAL CHECK
Check the input/output standard values for the power steering control unit.
Are the power steering control unit input/output values within standard ranges respectively?
YES >> Inspection End
NO >> GO TO 2.
.
.
Revision: August 2012 2012 Maxima
STC-2
< SYSTEM DESCRIPTION >
EPS SYSTEM
SYSTEM DESCRIPTION
EPS SYSTEM
System Diagram INFOID:0000000007254741
CONTROL DIAGRAM
JSGIA0119GB
A
B
C
D
E
F
STC
H
System Description INFOID:0000000007254742
• The EPS system controls the power steering solenoid valve
through the power steering control unit.
• The valve driving voltage to control the power steering solenoid
valve varies according to the vehicle speed.
OPERATION PRINCIPLE
During Parking (When Turning The Steering Wheel To The Right)
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AWGIA0089GB
M
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JSGIA0020GB
1. Power steering solenoid valve is closed while a vehicle is stopped.
2. Pinion “1R”, “2R” and “3R” are closed depending on steering torque of steering wheel.
3. Oil pressure “P” in the gear housing assembly is the sum of oil pressures occurring in “2R” and “3R”. This
results in a light steering force because of high pressure.
During High-speed Operation
Revision: August 2012 2012 Maxima
STC-3
P
EPS SYSTEM
< SYSTEM DESCRIPTION >
JSGIA0021GB
1. Power steering solenoid valve is opened during high-speed operation.
2. Pinion “1R”, “2R” and “3R” are closed depending on steering torque of steering wheel.
3. Oil pressure “2R” does not occur because the power steering solenoid valve is on full throttle.
4. Oil pressure “P” in the gear housing assembly includes only oil pressure occurring in “3R” and results in a
heavy steering force.
Component Parts Location INFOID:0000000007254743
AWGIA0090ZZ
Revision: August 2012 2012 Maxima
STC-4
< SYSTEM DESCRIPTION >
EPS SYSTEM
1. Power steering control unit M59
(view with glove box removed)
2. Power steering solenoid valve E14
Component Description INFOID:0000000007254744
Component parts Function
• Signals from various sensors control the driving voltage to the power steering solenoid valve.
Power steering control unit
Combination meter Refer to STC-12, "Description"
ECM Refer to STC-9, "Description"
Power steering solenoid valve Refer to STC-7, "Description"
• The power steering control unit controls the driving voltage to the power steering solenoid valve
for maintaining the power steering assist force when the fail-safe function is activated. (The engine speed signals control EPS system if any vehicle speed signal error is detected.)
.
.
.
A
B
C
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Revision: August 2012 2012 Maxima
STC-5
POWER SUPPLY AND GROUND CIRCUIT
< DTC/CIRCUIT DIAGNOSIS >
DTC/CIRCUIT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
Description INFOID:0000000007254745
EPS system functions by ignition power supply.
Diagnosis Procedure INFOID:0000000007254746
Regarding Wiring Diagram information, refer to STC-16, "Wiring Diagram".
1.CHECK POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect power steering control unit connector.
3. Turn the ignition switch ON.
4. Check voltage between power steering control unit connector
M59 terminal 3 and ground.
Power steering control unit
Connector Terminal
M59 3 —
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair harness or connectors.
Ground Condition Voltage (Approx.)
Ignition switch ON Battery voltage
Ignition switch OFF 0V
2.CHECK GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Check continuity between power steering control unit connector
M59 terminal 6 and ground.
Power steering control unit
Connector Terminal
M59 6 — Yes
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connectors.
Ground Continuity
3.CHECK TERMINALS AND HARNESS CONNECTORS
Check power steering control unit pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> Inspection End
NO >> Repair or replace damaged parts.
AWGIA0092ZZ
AWGIA0034ZZ
Revision: August 2012 2012 Maxima
STC-6
POWER STEERING SOLENOID VALVE
< DTC/CIRCUIT DIAGNOSIS >
POWER STEERING SOLENOID VALVE
Description INFOID:0000000007254747
Power steering solenoid valve controls the power steering oil pressure in the gear housing assembly.
Diagnosis Procedure INFOID:0000000007254748
Regarding Wiring Diagram information, refer to STC-16, "Wiring Diagram".
1.CHECK POWER STEERING SOLENOID VALVE SIGNAL
1. Start engine.
2. Check voltage between power steering control unit connector
M59 terminal 1 and ground.
Power steering control unit
Connector Terminal
M59 1 —
Ground Condition
Vehicle speed: 0 km/h (0
MPH)
(Engine is running)
Vehicle speed: 100 km/h
(62 MPH)
Voltage
(Approx.)
4.4 - 6.6 V
2.5 - 3.7 V
AWGIA0108ZZ
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK POWER STEERING SOLENOID VALVE HARNESS FOR OPEN
A
B
C
D
E
F
STC
H
I
1. Turn ignition switch OFF.
2. Disconnect power steering solenoid valve connector.
3. Disconnect power steering control unit connector.
4. Check continuity between power steering solenoid valve connector E14 (A) terminals 1, 2 and power steering control unit
connector M59 (B) terminal 1, 5.
Power steering solenoid valve Power steering control unit
Connector Terminal Connector Terminal
E14 (A)
1
25
M59 (B)
1
Continuity
Yes
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connectors.
3.CHECK POWER STEERING SOLENOID VALVE HARNESS FOR SHORT
1. Check continuity between power steering solenoid valve connector E14 terminals 1, 2 and ground.
Power steering solenoid valve
Connector Terminal
E14
1
2
Ground Continuity
—No
AWGIA0036ZZ
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AWGIA0093ZZ
Revision: August 2012 2012 Maxima
STC-7
POWER STEERING SOLENOID VALVE
< DTC/CIRCUIT DIAGNOSIS >
2. Turn ignition switch ON.
3. Check voltage between power steering solenoid valve connector
E14 terminals 1, 2 and ground.
Power steering solenoid valve
Connector Terminal
E14
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair harness or connectors.
1
2
Ground Voltage (Approx.)
—0V
AWGIA0094ZZ
4.CHECK POWER STEERING SOLENOID VALVE
Perform power steering solenoid valve component inspection. Refer to STC-8, "Component Inspection"
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace power steering solenoid valve. Refer to ST-33, "Exploded View"
.
.
5.CHECK TERMINALS AND HARNESS CONNECTORS
1. Check power steering control unit pin terminals for damage or loose connection with harness connector.
2. Check power steering solenoid valve pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> Inspection End
NO >> Repair or replace damaged parts.
Component Inspection INFOID:0000000007254749
1.POWER STEERING SOLENOID VALVE RESISTANCE CHECK
1. Turn ignition switch OFF.
2. Disconnect power steering solenoid valve connector.
3. Check resistance between power steering solenoid valve terminals 1 and 2
Power steering solenoid valve terminals Resistance (Approx.)
1 - 2 5 Ω
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace power steering solenoid valve. Refer to ST-33,
"Exploded View".
2.POWER STEERING SOLENOID VALVE OPERATION CHECK
Check power steering solenoid valve by listening for its operation
sound while applying battery voltage to power steering solenoid
valve terminal 1 (positive) and battery ground to terminal 2 (negative).
Is the inspection result normal?
YES >> Inspection End
NO >> Replace power steering solenoid valve. Refer to ST-33,
"Exploded View".
AWGIA0037ZZ
AWGIA0038ZZ
Revision: August 2012 2012 Maxima
STC-8
< DTC/CIRCUIT DIAGNOSIS >
ENGINE SPEED SIGNAL CIRCUIT
ENGINE SPEED SIGNAL CIRCUIT
Description INFOID:0000000007254750
ECM sends engine speed signal to power steering control unit.
Diagnosis Procedure INFOID:0000000007254751
Regarding Wiring Diagram information, refer to STC-16, "Wiring Diagram".
1.PERFORM ECM SELF-DIAGNOSIS
With CONSULT
Perform ECM self-diagnosis.
Is any error system detected?
YES >> Check the error system.
NO >> GO TO 2.
2.CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT FOR OPEN
1. Turn the ignition switch OFF.
2. Disconnect ECM connector E10.
3. Disconnect power steering control unit connector.
4. Check continuity between ECM connector E10 (A) terminal 94
and power steering control unit connector M59 (B) terminal 10.
A
B
C
D
E
F
STC
H
ECM Power steering control unit
Connector Terminal Connector Terminal
E10 (A) 94 M59 (B) 10 Yes
Continuity
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connectors.
3.CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT FOR SHORT
1. Check continuity between ECM connector E10 terminal 94 and
ground.
ECM
Connector Terminal
E10 94 — No
2. Turn ignition switch ON.
3. Check voltage between ECM connector E10 terminal 94 and
ground.
Ground Continuity
AWGIA0039ZZ
AWGIA0095ZZ
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ECM
Connector Terminal
E10 94 — 0V
Ground Voltage (Approx.)
Is the inspection result normal?
YES >> GO TO 4.
Revision: August 2012 2012 Maxima
STC-9
AWGIA0096ZZ
ENGINE SPEED SIGNAL CIRCUIT
< DTC/CIRCUIT DIAGNOSIS >
NO >> Repair harness or connectors.
4.CHECK ENGINE SPEED SIGNAL (ECM SIDE)
1. Turn the ignition switch OFF.
2. Connect ECM connector E10.
3. Start the engine.
4. Check signal between ECM connector E10 terminal 94 and
ground with oscilloscope.
ECM
Connector Terminal Condition
Engine speed:
At idle
(Warm-up condition)
E10 94 - Ground
Engine speed:
Approx. 2,000
rpm
(Warm-up condition)
Value (Approx.)
JSGIA0143ZZ
PBIA3655J
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace ECM.
5.CHECK ENGINE SPEED SIGNAL (POWER STEERING CONTROL UNIT SIDE)
1. Turn the ignition switch OFF.
2. Connect power steering control unit harness connector.
3. Start the engine.
4. Check signal between power steering control unit harness connector M59 terminal 10 and ground with oscilloscope.
AWGIA0119ZZ
Power steering control unit
Connector Terminal Condition
Engine speed:
At idle
(Warm-up condition)
M59 10 - Ground
Engine speed:
Approx. 2,000
rpm
(Warm-up condition)
Value (Approx.)
AWGIA0120ZZ
JSGIA0143ZZ
PBIA3655J
Is the inspection result normal?
Revision: August 2012 2012 Maxima
STC-10
ENGINE SPEED SIGNAL CIRCUIT
< DTC/CIRCUIT DIAGNOSIS >
YES >> GO TO 6.
NO >> Replace power steering control unit. Refer to STC-21, "Removal and Installation"
6.CHECK TERMINALS AND HARNESS CONNECTORS
.
A
1. Check power steering control unit pin terminals for damage or loose connection with harness connector.
2. Check ECM pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> Inspection End.
NO >> Repair or replace damaged parts.
B
C
D
E
F
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Revision: August 2012 2012 Maxima
STC-11
VEHICLE SPEED SIGNAL CIRCUIT
< DTC/CIRCUIT DIAGNOSIS >
VEHICLE SPEED SIGNAL CIRCUIT
Description INFOID:0000000007254752
Combination meter sends vehicle speed signal to power steering control unit.
Diagnosis Procedure INFOID:0000000007254753
Regarding Wiring Diagram information, refer to STC-16, "Wiring Diagram".
1.PERFORM COMBINATION METER SELF-DIAGNOSIS
Perform combination meter self-diagnosis.
Is any error system detected?
YES >> Check the error system.
NO >> GO TO 2.
2.CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT FOR
OPEN
1. Turn the ignition switch OFF.
2. Disconnect combination meter connector.
3. Disconnect power steering control unit connector.
4. Check continuity between combination meter connector M24 (A)
terminal 30 and power steering control unit connector M59 (B)
terminal 8.
Combination meter Power steering control unit
Connector Terminal Connector Terminal
M24 (A) 30 M59 (B) 8 Yes
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connectors.
Continuity
3.CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT FOR
SHORT
1. Check continuity between combination meter connector M24
terminal 30 and ground.
Combination meter
Connector Terminal
M24 30 — No
Ground Continuity
AWGIA0109ZZ
AWGIA0097ZZ
Revision: August 2012 2012 Maxima
STC-12
VEHICLE SPEED SIGNAL CIRCUIT
< DTC/CIRCUIT DIAGNOSIS >
2. Turn ignition switch ON.
3. Check voltage between combination meter connector M24 terminal 30 and ground.
A
Combination meter
Connector Terminal
M24 30 — 0V
Ground Voltage (Approx.)
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair harness or connectors.
4.CHECK VEHICLE SPEED SIGNAL (COMBINATION METER SIDE)
1. Turn the ignition switch OFF.
2. Connect combination meter connector.
3. Check combination meter input/output standard values. Refer to MWI-47, "Reference Value"
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace combination meter. Refer to MWI-121, "Removal and Installation"
5.CHECK VEHICLE SPEED SIGNAL (POWER STEERING CONTROL UNIT SIDE)
1. Turn the ignition switch OFF.
2. Connect power steering control unit connector.
3. Start the engine.
4. Check signal between power steering control unit connector
M59 terminal 8 and ground with oscilloscope.
Power steering control unit
Connector Terminal Condition
M59 8 - Ground
Vehicle speed:
40 km/h (25
MPH)
CAUTION:
Check air
pressure of
tire under
standard condition.
Value (Approx.)
ELF1080D
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace power steering control unit. Refer to STC-21, "Removal and Installation"
6.CHECK TERMINALS AND HARNESS CONNECTORS
B
C
AWGIA0098ZZ
D
E
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F
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STC
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AWGIA0121ZZ
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1. Check power steering control unit pin terminals for damage or loose connection with harness connector.
2. Check combination meter pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> Inspection End
NO >> Repair or replace damaged parts.
Revision: August 2012 2012 Maxima
STC-13
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POWER STEERING CONTROL UNIT
< ECU DIAGNOSIS INFORMATION >
ECU DIAGNOSIS INFORMATION
POWER STEERING CONTROL UNIT
Reference Value INFO ID:0000000007254754
TERMINAL LAYOUT
JSGIA0023ZZ
PHYSICAL VALUES
Te r m i n al N o.
+ - Signal name
1GroundR/Y
3GroundG
5GroundLG/W
6 Ground B Ground — Always 0 V
Wire
color
8GroundL/B
Description
Power steering solenoid valve voltage
Ignition power supply
Power steering solenoid valve ground
Vehicle speed signal
Input/
Output
Vehicle speed: 0 km/h (0 MPH)
Output
Input
Input
(Engine is running)
Vehicle speed: 100 km/h (62 MPH) 2.5 - 3.7 V
Ignition switch: ON Battery voltage
Ignition switch: OFF 0 V
—Always 0 V
Vehicle speed: 40 km/h (25 MPH)
CAUTION:
Check air pressure of tire under
standard condition.
Engine speed: At idle
(Warm-up condition)
Condition Value (Approx.)
4.4 - 6.6 V
ELF1080D
10 Ground V/W
CAUTION:
Revision: August 2012 2012 Maxima
Engine speed signal
Input
Engine speed: Approx. 2,000 RPM
(Warm-up condition)
STC-14
JSGIA0143ZZ
PBIA3655J
POWER STEERING CONTROL UNIT
< ECU DIAGNOSIS INFORMATION >
When using circuit tester or oscilloscope to measure voltage for inspection, be sure not to extend forcibly any connector terminals.
Fail Safe INFOID:0000000007254755
A
EPS system
• EPS system enters the fail-safe mode (that allows the steering
force to be controlled without impairing the drive ability) if any of
the input/output signals to/from EPS system (power steering control unit) deviate from the standard.
NOTE:
The system enters the fail-safe mode if the engine speed remains
at 1,500 RPM or more for over 10 seconds while the vehicle is
stopped. This is normal.
• The fail-safe function is cancelled when a vehicle speed signal of 2
km/h (1.2 MPH) or more is inputted or the key switch is turned
OFF→ ON. EPS system restores the normal operation at that time.
Function
Fail-safe
function
Warn-
ing lamp
DTC No. Detection point (malfunction part) Malfunction part and cause
— — Vehicle speed signal
• Engine speed is 1,500 RPM or more and there is no vehicle
speed signal input for over 10 seconds during vehicle travel.
• Vehicle speed signal has abruptly dropped from 30 km/h (19
MPH) or more to 2 km/h (1.2 MPH) or less within 1.4 seconds.
B
C
D
E
ABGIA0091GB
F
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Revision: August 2012 2012 Maxima
STC-15
ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM
< WIRING DIAGRAM >
WIRING DIAGRAM
ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM
Wiring Diagram INFOID:0000000007254756
ABGWA0002GB
Revision: August 2012 2012 Maxima
STC-16
ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM
< WIRING DIAGRAM >
A
B
C
D
E
F
STC
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ABGIA0033GB
Revision: August 2012 2012 Maxima
STC-17
P
ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM
< WIRING DIAGRAM >
ABGIA0034GB
Revision: August 2012 2012 Maxima
STC-18
UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)
< SYMPTOM DIAGNOSIS >
SYMPTOM DIAGNOSIS
UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)
Description INFOID:0000000007254757
• Hard steering when fully turning the steering wheel.
• Light steering when driving at a high speed.
Diagnosis Procedure INFOID:0000000007254758
1.CHECK SYSTEM FOR POWER SUPPLY AND GROUND
Perform trouble diagnosis for power supply and ground circuit. Refer to STC-6, "Diagnosis Procedure"
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace damaged parts.
2.CHECK SYSTEM FOR VEHICLE SPEED SIGNAL
Perform trouble diagnosis for vehicle speed signal. Refer to STC-12, "Diagnosis Procedure"
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace damaged parts.
.
3.CHECK SYSTEM FOR ENGINE SPEED SIGNAL
.
A
B
C
D
E
F
STC
H
Perform trouble diagnosis for engine speed signal. Refer to STC-9, "Diagnosis Procedure"
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace damaged parts.
.
4.CHECK SYSTEM FOR POWER STEERING SOLENOID VALVE
Perform trouble diagnosis for power steering solenoid valve. Refer to STC-7, "Diagnosis Procedure"
Is the inspection result normal?
YES >> Perform the symptom diagnosis for the steering system. Refer to ST-8, "NVH Troubleshooting
Chart".
NO >> Repair or replace damaged parts.
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Revision: August 2012 2012 Maxima
STC-19
P
PRECAUTIONS
< PRECAUTION >
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Manual.
WARNING:
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors.
INFOID:0000000007254759
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Ignition ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the
battery, and wait at least 3 minutes before performing any service.
Revision: August 2012 2012 Maxima
STC-20
EPS CONTROL UNIT
< UNIT REMOVAL AND INSTALLATION >
UNIT REMOVAL AND INSTALLATION
EPS CONTROL UNIT
Removal and Installation INFOID:0000000007254760
REMOVAL
1. Disconnect negative battery terminal. Refer to PG-67, "Removal and Installation (Battery)".
2. Remove audio/navigation unit. Refer to AV-66, "Removal and Installation"
"Removal and Installation" (BOSE W/MONOCHROME DISPLAY), AV-322, "Removal and Installation"
(BOSE W/COLOR DISPLAY), AV-490, "Removal and Installation" (BOSE W/COLOR DISPLAY W/NAVI-
GATION).
3. Remove automatic drive position control unit (if equipped). Refer to ADP-172, "Removal and Installation"
4. Remove EPS control unit (1) from the bracket.
5. Disconnect EPS control unit connector (A) and remove the EPS
control unit (1).
(BASE AUDIO), AV-159,
ALGIA0040ZZ
A
B
C
D
.
E
F
STC
H
INSTALLATION
Installation is in the reverse order of removal.
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Revision: August 2012 2012 Maxima
STC-21
P
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