Ford Mustang 3.8 (1998) Workshop Manual

Factory Workshop Manual

Ford

Mustang

V6-3.8L VIN 4 (1998)

Anonymous

1st January 2018

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Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm
Module, (Vehicle Antitheft) > Component Information > Specifications

Alarm Module: Specifications
Anti-Theft Transceiver Module Screw

........................................................................................................................................................ 2

N.m (18 Lb-In) Passive Anti-Theft System Control Module Retaining Screw

............................................................................................................... 2.4-4.0 (22-35 Lb-In)

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm
Module, (Vehicle Antitheft) > Component Information > Locations > Anti-Theft Control Module

Alarm Module: Locations Anti-Theft Control Module
Convertible
Full Body View (Convertible)
The Anti-Theft Controller Module is located at the LH rear of the trunk, behind trim panel.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm
Module, (Vehicle Antitheft) > Component Information > Locations > Anti-Theft Control Module > Page 9

Coupe
Full Body View (Coupe)
The Anti-Theft Controller Module is located at the LH rear of the trunk, behind trim panel.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm
Module, (Vehicle Antitheft) > Component Information > Locations > Anti-Theft Control Module > Page 10

Alarm Module: Locations Passive Anti-Theft System Module
Instrument Panel View
The Passive Anti-Theft System Module is located in instrument panel near wiper control module.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm
Module, (Vehicle Antitheft) > Component Information > Diagrams > Anti-Theft Controller Module

Alarm Module: Diagrams Anti-Theft Controller Module

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm
Module, (Vehicle Antitheft) > Component Information > Diagrams > Anti-Theft Controller Module > Page 13

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm
Module, (Vehicle Antitheft) > Component Information > Diagrams > Anti-Theft Controller Module > Page 14

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm
Module, (Vehicle Antitheft) > Component Information > Service and Repair > Key Programming - Spare Key Programming
Switch

Alarm Module: Service and Repair Key Programming - Spare Key Programming Switch

NOTE:
^ The Spare Key Programming Switch is a New STAR Generation Tester/Service Bay Diagnostic

System (NGS/SBDS) programmable switch which provides the capability to enable/disable the
normal customer Spare Key Programming Procedure detailed in the Owner's Manual (customer
can program a spare ignition key by cycling two programmed ignition keys and then cycling the
new key). This programmable switch is provided as a convenience for rental company fleets or
other fleet purchasers who may not want the Spare Key Programming procedure available to the
vehicle driver.

^ The spare key programming switch state can be viewed by PATS PID SPARE__KY.

1. Insert a programmed ignition key into ignition switch and turn ignition switch from OFF to RUN.

2. Enter NGS/SBDS. Follow the Security Access Procedure to obtain security access. 3. From
NGS/SBDS menu: Toggle SPARE KEY PROGRAMMING SWITCH selection to desired setting:

Spare Key Programming Procedure is accessible.
Spare Key Programming Procedure is not accessible.
NOTE: The default setting on delivery of all new vehicles is .

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm
Module, (Vehicle Antitheft) > Component Information > Service and Repair > Key Programming - Spare Key Programming
Switch > Page 17

Alarm Module: Service and Repair Removal and Installation
Anti-Theft System, Active
REMOVAL

1. Disconnect battery ground cable. 2. Open the luggage compartment door. Remove trim from LH
side of luggage compartment. 3. Disconnect electrical connectors from anti-theft alarm control. 4.
Remove anti-theft alarm control by pushing on the panel retaining tab below the anti-theft alarm
control while sliding the anti-theft alarm control

down.
INSTALLATION

1. Follow removal procedure in reverse order. 2. Test system for proper operation.
Anti-Theft System, Passive

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm
Module, (Vehicle Antitheft) > Component Information > Service and Repair > Key Programming - Spare Key Programming
Switch > Page 18

REMOVAL

1. Disconnect battery ground cable. 2. Remove the steering column opening cover assembly and
reinforcement to access Passive Anti-Theft System (PATS) module located to right of

fuse junction panel.

3. Remove three fasteners retaining module and bracket and one fastener attaching metal brace
near module. 4. Disconnect main wiring harness connector and remove PATS module and
mounting bracket.

INSTALLATION
NOTE: The PATS module must be reconfigured after replacement. Review information found in the

PATS Configuration Command Index. For additional reprogramming assistance, review the help
screen on the New Generation STAR (NGS) Tester configuration card.

1. Follow removal procedure in reverse order. 2. Tighten all three screws to 2.4-4.0 N.m (22-35
lb-in).

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm
Module, (Vehicle Antitheft) > Component Information > Service and Repair > Key Programming - Spare Key Programming
Switch > Page 19

Alarm Module: Service and Repair Spare Key Programming-Security Access Procedure

NOTE: The Security Access Procedure is utilized to obtain passive anti-theft system (PATS)
security access. PATS security access must be granted to erase ignition keys, enable/disable the
spare key programming switch (PID SPARE_KY), or perform parameter resets for the PATS or
PCM. The Security Access Procedure invokes an inherent 10 minute time delay prior to granting
security access during which the New Generation STAR Tester/Service Bay Diagnostic System
(NGS/SBDS) must remain connected to the vehicle. Once security access has been granted, a
security access command menu is displayed which offers various ignition key program, ignition key
erase, and configuration command options (review the PATS Configuration Command Index).
Multiple commands may be performed as necessary before exiting this menu.

NOTE:
^ Once security access has been granted, multiple security access commands can be executed (if

necessary) prior to exiting the security access command menu. Execution of all necessary security
access commands prior to exiting the command menu avoids the performance of an additional
Security Access Procedure and the associated 10 minute time delay.

^ Security access for the PATS and security access for the PCM must be obtained separately as
needed (each requires a 10 minute wait). 1. From NGS/SBDS: From the Function Test menu:
Enter SECURITY ACCESS PROCEDURE. This procedure will take 10 minutes to

perform, during which the ignition switch must be in RUN and the NGS/SBDS must be connected
to the vehicle.

2. After the 10 minute Security Access Procedure has been completed, a new menu will be
displayed with configuration and clearing options.

Select as many of these functions as required before backing out of this menu. Once backed out of
this menu, the Security Access Procedure must be performed again before any further
configuration and clearing can take place.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm
Module, (Vehicle Antitheft) > Component Information > Service and Repair > Key Programming - Spare Key Programming
Switch > Page 20

Alarm Module: Service and Repair Spare Key Programming-With Programmed Keys

NOTE:
^ This procedure only works if two or more programmed ignition keys are available and it is desired

to program additional key(s). If two keys are not available follow Spare Key Programming - Without
Programmed Key.

^ PID SPAR_KY must be enabled for this procedure to operate. If this PID is not enabled, follow
the Security Access Procedure, then select Spare Key Programming Switch: Enabled.

^ If the programming procedure is successful, the new key(s) will start the vehicle and the THEFT
INDICATOR will illuminate for approximately 3 seconds.

^ If the programming procedure is not successful, the new key(s) will not start the vehicle and the
THEFT INDICATOR will flash for 1 minute (after flashing for 1 minute, the THEFT INDICATOR will
flash the fault code). If the programming procedure was not successful repeat the Key
Programming procedure from Step 1. If the failure repeats, review DTCs and perform Pinpoint
Tests.

^ A maximum of 8 ignition keys can be programmed to a Passive Anti-theft System (PATS)
equipped vehicle.

^ If the steps are not performed as outlined, the programming procedure will end.
^ Ignition keys must have correct mechanical key cut for the vehicle and must be a PATS encoded

key.

1. Insert first programmed ignition key into ignition switch and turn ignition switch from OFF to RUN
(maintain ignition switch in RUN for 1 second

.

2. Turn ignition switch to OFF and remove first key from ignition switch. 3. Within 5 seconds of
turning the ignition switch to OFF, insert second programmed ignition key into ignition switch and
turn ignition switch from

OFF to RUN (maintain ignition switch in RUN for 1 second).

4. Turn ignition switch to OFF and remove second key from ignition switch. 5. Within 10 seconds of
turning the ignition switch to OFF, insert the unprogrammed ignition key (new key) into ignition
switch and turn ignition

switch from OFF to RUN (maintain ignition switch in RUN for 1 second).

6. If it is desired to program additional key(s), repeat the key Programming Procedure from the
beginning.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm
Module, (Vehicle Antitheft) > Component Information > Service and Repair > Key Programming - Spare Key Programming
Switch > Page 21

Alarm Module: Service and Repair Spare Key Programming-Without Programmed Keys

NOTE:
^ This procedure is for the situation where a customer needs keys programmed into the system

and does not have 2 programmed ignition keys available. This procedure is also useful when
programmed ignition key(s) have been lost or the ignition switch assembly has been replaced, and
it is desired to erase key(s) from Passive Anti-theft System (PATS) memory.

^ This procedure will erase all programmed ignition keys from vehicle memory and the vehicle will
not start until two keys have been reprogrammed to the vehicle.

^ Two PATS encoded keys with the correct mechanical cut must be available to perform this
procedure. One or both of them may be the customer's original keys.

^ If additional keys are to be programmed, follow key Programming - With Programmed keys. If the
remaining keys are with the customer and are not available with the vehicle, then instruct the
customer to review their Owner's Manual under "Programming Spare keys Procedure" for
instructions on programming their remaining keys.

1. Turn ignition switch from OFF to RUN. 2. Enter New Generation STAR Tester/Service Bay
Diagnostic System (NGS/SBDS). Follow the Security Access Procedure to obtain security

access.

3. From NGS/SBDS menu: Select IGNITION KEY CODE ERASE. 4. Turn ignition switch to OFF
and disconnect the NGS. 5. Insert first encoded key into the ignition switch and turn the switch to
RUN for three seconds. 6. Insert the second encoded key into the ignition switch and turn the
switch to RUN for three seconds. 7. Vehicle should now start with both ignition keys.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless
Entry Module > Component Information > Locations > Convertible

Keyless Entry Module: Locations Convertible
Full Body Views (Convertible)
The Remote/Keyless Entry Module is located at the LH rear of trunk, behind side trim.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless
Entry Module > Component Information > Locations > Convertible > Page 26

Keyless Entry Module: Locations Coupe
Full Body View (Coupe)
The Remote/Keyless Entry Module is located at the LH rear of trunk, behind side trim.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless
Entry Module > Component Information > Locations > Page 27

Keyless Entry Module: Diagrams

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless
Entry Module > Component Information > Locations > Page 28

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless
Entry Module > Component Information > Locations > Page 29

Keyless Entry Module: Description and Operation

- The remote keyless entry module is located behind the LH luggage compartment trim panel.

- It contains a radio receiver that receives a signal from the keyless entry remote transmitter
through the remote keyless entry module internal antenna.

- It sends the appropriate command to the power door locks, the horn relay, the park lamps, the
luggage compartment door solenoid, and the anti-theft warning system if equipped.

- The remote keyless entry module is equipped with a battery backup which holds the programmed
code in memory when the vehicle battery is disconnected.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless
Entry Module > Component Information > Locations > Page 30

Keyless Entry Module: Service and Repair
REMOVAL

1. Disconnect battery ground cable. 2. Open luggage compartment door. 3. Remove LH side
luggage compartment trim panel and locate remote keyless entry module in LH relay mounting
panel. 4. Disengage retaining tabs on relay mounting panel and lower relay mounting panel. 5.
Remove the remote keyless entry module from the relay mounting panel. 6. Disconnect three
connectors.

INSTALLATION

1. Follow removal procedure in reverse order.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Convertible Top Relay >
Component Information > Locations > Lower Relay

Convertible Top Relay: Locations Lower Relay
Full Body Views (Convertible)
The Lower Relay is located behind rear seat, at the LH side of the convertible top motor.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Convertible Top Relay >
Component Information > Locations > Lower Relay > Page 36

Convertible Top Relay: Locations Raise Relay
Full Body Views (Convertible)
The Raise Relay is located behind top center of rear seat, at the LH side of the convertible top

motor.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Convertible Top Relay >
Component Information > Diagrams > Lower Relay

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Convertible Top Relay >
Component Information > Diagrams > Lower Relay > Page 39

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module >
Component Information > Locations > Convertible

Keyless Entry Module: Locations Convertible
Full Body Views (Convertible)
The Remote/Keyless Entry Module is located at the LH rear of trunk, behind side trim.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module >
Component Information > Locations > Convertible > Page 44

Keyless Entry Module: Locations Coupe
Full Body View (Coupe)
The Remote/Keyless Entry Module is located at the LH rear of trunk, behind side trim.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module >
Component Information > Locations > Page 45

Keyless Entry Module: Diagrams

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module >
Component Information > Locations > Page 46

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module >
Component Information > Locations > Page 47

Keyless Entry Module: Description and Operation

- The remote keyless entry module is located behind the LH luggage compartment trim panel.

- It contains a radio receiver that receives a signal from the keyless entry remote transmitter
through the remote keyless entry module internal antenna.

- It sends the appropriate command to the power door locks, the horn relay, the park lamps, the
luggage compartment door solenoid, and the anti-theft warning system if equipped.

- The remote keyless entry module is equipped with a battery backup which holds the programmed
code in memory when the vehicle battery is disconnected.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module >
Component Information > Locations > Page 48

Keyless Entry Module: Service and Repair
REMOVAL

1. Disconnect battery ground cable. 2. Open luggage compartment door. 3. Remove LH side
luggage compartment trim panel and locate remote keyless entry module in LH relay mounting
panel. 4. Disengage retaining tabs on relay mounting panel and lower relay mounting panel. 5.
Remove the remote keyless entry module from the relay mounting panel. 6. Disconnect three
connectors.

INSTALLATION

1. Follow removal procedure in reverse order.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake
Control Module > Component Information > Specifications

Electronic Brake Control Module: Specifications

Retaining Bolts ....................................................................................................................................

..................................... 2.4-3.4 Nm (21-30 inch lbs.)

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake
Control Module > Component Information > Specifications > Page 53

Electronic Brake Control Module: Locations
Engine View
The Anti-Lock Brake Control Module is located at the RH front of the engine compartment, behind

radiator.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake
Control Module > Component Information > Specifications > Page 54

Anti-Lock Brake System (Part 2 Of 2)

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake
Control Module > Component Information > Specifications > Page 55

Electronic Brake Control Module: Description and Operation
The anti-lock control module also has on-board diagnostic capabilities and stores Diagnostic

Trouble Codes (DTCs) in its memory. If a fault is detected in the system, a DTC will be stored in
the anti-lock brake control module memory, and the instrument panel ANTI-LOCK warning indicator
will illuminate when the engine is running. The anti-lock brake control module has the ability to
store three DTCs in memory. When the anti-lock brake control module detects an impending wheel
lock, it modulates brake pressure to the appropriate brake caliper. The anti-lock brake control
module receives wheel speed readings from each brake anti-lock sensor, and uses this information
to compare wheel speeds. By continuously monitoring and comparing the rotational speed of each
wheel, the anti-lock brake control module activates the anti-lock braking system only when it
senses an impending wheel lock-up under severe braking conditions. The anti-lock brake control
module decides which brakes need to be controlled, and sends the appropriate signals to the
Hydraulic Control Unit (hydraulic portion of the assembly). Impending wheel lock conditions trigger
signals from the Hydraulic Control Unit that open and close the appropriate modulator solenoid
valves. This may result in moderate pulsations in the brake pedal when applied. During normal
braking (non-ABS stop), brake pedal feel will be the same as a vehicle with a standard brake
system (non-ABS).

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake
Control Module > Component Information > Specifications > Page 56

Electronic Brake Control Module: Service and Repair
REMOVAL

1. Remove the EHCU. 2. Disconnect the pump motor connector. 3. Remove the six mounting
screws. 4. Remove the control module.

INSTALLATION

1. Carefully fit the coils of the control module over the valve bodies of the hydraulic unit.
CAUTION:

- Position the spring plate for proper installation. Failure to do so can result in the loss of the
anti-lock brake system, although normal braking system will remain.

- Be sure the sealing surface of the hydraulic unit is clear of all foreign material. Do not use any
chemical solvents on the hydraulic unit.

2. Tighten the screws in proper sequence as shown to 2.4-3.4 Nm.
NOTE: Do not reuse the screws, install the new screws that are supplied in the service kit. Hand

tighten the six screws into the HCU before tightening to specification.

3. Remove and retighten the screws to specification as necessary.
NOTE: Check for any gaps between the control module and the hydraulic unit.

4. Connect the pump motor electrical connector. 5. Install the EHCU. 6. Bleed the brake system.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control
Module > Component Information > Specifications

Radiator Cooling Fan Control Module: Specifications

Wiring Harness Bolt .............................................................................................................................

.................................... 1.3-2.0 Nm (12-18 inch lbs.)

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control
Module > Component Information > Specifications > Page 61

Radiator Cooling Fan Control Module: Description and Operation
PURPOSE
The Constant Control Relay Module (CCRM) interfaces with the Powertrain Control Module (PCM)

to provide control of the cooling fan and A/C clutch. The module includes the PCM power relay to
provide power to the PCM. These relays are contained in one housing, resulting in longer service
life and reduced wiring requirements for operation.

CONSTRUCTION
The CCRM has one 24-pin connector. Relays contained in the housing are independent of one

another.
OPERATION
The relays contained within the CCRM are interdependent and work with each other. The following

describes the different relay functions within the CCRM:
EEC Power Relay
For any other circuit in the CCRM to operate, this circuit must be powered up. This prevents

actuators from being turned on without the EEC system having control over them.
Fuel Pump Relay
The fuel pump relay circuit controls the fuel pump. The PCM provides the ground circuit for the

primary side of the relay. The secondary side supplies Battery Voltage (B+) to the fuel pump itself.
Cooling Fan Motor Relay
The cooling fan motor is controlled during vehicle operation by the constant control relay module

(CCRM)(12B581) and powertrain control module (PCM)(12A650) which energizes the cooling fan
motor under the following conditions: -

When the engine temperature is higher than normal the cooling fan motor starts operating at 105°C
(221°F) and stops when temperature drops to 94°C (200°F).

- When vehicle A/C is on and vehicle speed does not provide enough natural airflow, the cooling
fan motor starts running at or below 69 km/h (43 mph) and stops at 77 km/h (48 mph).

Low Fan Control Relay
The Low Fan Control (LFC) relay controls the electric cooling fan. The primary control circuit of the

LFC relay is normally high (B+). In this state the low speed cooling fan runs continuously. To turn
the fan off, The PCM grounds this circuit, pulling it low (near zero volts). A "fail safe" is built into the
LFC circuit to run the fan anytime the EEC power relay is activated, should the PCM fail open
circuit.

High Fan Control Relay
The High Fan Control (HFC) relay circuit operates the high speed electric cooling fan. If the Engine

Coolant Temperature (ECT) sensor relays a high temperature or overheat condition to the PCM, it
activates the HFC. In order to turn the high speed cooling fan on, the PCM grounds the primary
circuit of the HFC relay. The secondary circuit applies B+ to the cooling fan motor.

Wide Open Throttle A/C Control Relay
This circuit controls the A/C compressor clutch during normal operation. This circuit also

disengages the A/C clutch as commanded by the PCM during Wide Open Throttle (WOT)

conditions. This solid state relay has two control circuits. One is used to engage the A/C clutch
upon demand from the vehicle operator and the A/C cycling pressure switch. The other control is
used to disengage the clutch upon command from the PCM.

Power Ground
This circuit provides the CCRM with a ground source for operating various controls. The circuit

uses one pin that goes to the battery negative terminal.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Control
Module > Component Information > Specifications > Page 62

Radiator Cooling Fan Control Module: Service and Repair
REMOVAL

1. Remove inner fender splash shield (RH). 2. Disconnect wiring harness from Constant Control
Relay Module (CCRM). 3. Remove constant control relay module retaining screws.

INSTALLATION

1. Follow removal procedure in reverse order. 2. Tighten constant control relay module retaining
screws securely. Tighten wiring harness bolt to 1.3-2.0 Nm (12-17 in. lbs.).

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor
Relay > Component Information > Locations

Radiator Cooling Fan Motor Relay: Locations
Engine View

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor
Relay > Component Information > Locations > Page 66

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor
Relay > Component Information > Locations > Page 67

Radiator Cooling Fan Motor Relay: Description and Operation
PURPOSE
The Constant Control Relay Module (CCRM) interfaces with the Powertrain Control Module (PCM)

to provide control of the cooling fan and A/C clutch. The module includes the PCM power relay to
provide power to the PCM. These relays are contained in one housing, resulting in longer service
life and reduced wiring requirements for operation.

CONSTRUCTION
The CCRM has one 24-pin connector. Relays contained in the housing are independent of one

another.
OPERATION
The relays contained within the CCRM are interdependent and work with each other. The following

describes the different relay functions within the CCRM:
EEC Power Relay
For any other circuit in the CCRM to operate, this circuit must be powered up. This prevents

actuators from being turned on without the EEC system having control over them.
Fuel Pump Relay
The fuel pump relay circuit controls the fuel pump. The PCM provides the ground circuit for the

primary side of the relay. The secondary side supplies Battery Voltage (B+) to the fuel pump itself.
Cooling Fan Motor Relay
The cooling fan motor is controlled during vehicle operation by the constant control relay module

(CCRM)(12B581) and powertrain control module (PCM)(12A650) which energizes the cooling fan
motor under the following conditions: -

When the engine temperature is higher than normal the cooling fan motor starts operating at 105°C
(221°F) and stops when temperature drops to 94°C (200°F).

- When vehicle A/C is on and vehicle speed does not provide enough natural airflow, the cooling
fan motor starts running at or below 69 km/h (43 mph) and stops at 77 km/h (48 mph).

Low Fan Control Relay
The Low Fan Control (LFC) relay controls the electric cooling fan. The primary control circuit of the

LFC relay is normally high (B+). In this state the low speed cooling fan runs continuously. To turn
the fan off, The PCM grounds this circuit, pulling it low (near zero volts). A "fail safe" is built into the
LFC circuit to run the fan anytime the EEC power relay is activated, should the PCM fail open
circuit.

High Fan Control Relay
The High Fan Control (HFC) relay circuit operates the high speed electric cooling fan. If the Engine

Coolant Temperature (ECT) sensor relays a high temperature or overheat condition to the PCM, it
activates the HFC. In order to turn the high speed cooling fan on, the PCM grounds the primary
circuit of the HFC relay. The secondary circuit applies B+ to the cooling fan motor.

Wide Open Throttle A/C Control Relay
This circuit controls the A/C compressor clutch during normal operation. This circuit also

disengages the A/C clutch as commanded by the PCM during Wide Open Throttle (WOT)

conditions. This solid state relay has two control circuits. One is used to engage the A/C clutch
upon demand from the vehicle operator and the A/C cycling pressure switch. The other control is
used to disengage the clutch upon command from the PCM.

Power Ground
This circuit provides the CCRM with a ground source for operating various controls. The circuit

uses one pin that goes to the battery negative terminal.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Cruise Control > Cruise Control Module >
Component Information > Diagrams

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component
Information > Locations

Compressor Clutch Relay: Locations
Engine View

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component
Information > Locations > Page 76

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component
Information > Locations > Page 77

Compressor Clutch Relay: Description and Operation
PURPOSE
The Constant Control Relay Module (CCRM) interfaces with the Powertrain Control Module (PCM)

to provide control of the cooling fan and A/C clutch. The module includes the PCM power relay to
provide power to the PCM. These relays are contained in one housing, resulting in longer service
life and reduced wiring requirements for operation.

CONSTRUCTION
The CCRM has one 24-pin connector. Relays contained in the housing are independent of one

another.
OPERATION
The relays contained within the CCRM are interdependent and work with each other. The following

describes the different relay functions within the CCRM:
EEC Power Relay
For any other circuit in the CCRM to operate, this circuit must be powered up. This prevents

actuators from being turned on without the EEC system having control over them.
Fuel Pump Relay
The fuel pump relay circuit controls the fuel pump. The PCM provides the ground circuit for the

primary side of the relay. The secondary side supplies Battery Voltage (B+) to the fuel pump itself.
Cooling Fan Motor Relay
The cooling fan motor is controlled during vehicle operation by the constant control relay module

(CCRM)(12B581) and powertrain control module (PCM)(12A650) which energizes the cooling fan
motor under the following conditions: -

When the engine temperature is higher than normal the cooling fan motor starts operating at 105°C
(221°F) and stops when temperature drops to 94°C (200°F).

- When vehicle A/C is on and vehicle speed does not provide enough natural airflow, the cooling
fan motor starts running at or below 69 km/h (43 mph) and stops at 77 km/h (48 mph).

Low Fan Control Relay
The Low Fan Control (LFC) relay controls the electric cooling fan. The primary control circuit of the

LFC relay is normally high (B+). In this state the low speed cooling fan runs continuously. To turn
the fan off, The PCM grounds this circuit, pulling it low (near zero volts). A "fail safe" is built into the
LFC circuit to run the fan anytime the EEC power relay is activated, should the PCM fail open
circuit.

High Fan Control Relay
The High Fan Control (HFC) relay circuit operates the high speed electric cooling fan. If the Engine

Coolant Temperature (ECT) sensor relays a high temperature or overheat condition to the PCM, it
activates the HFC. In order to turn the high speed cooling fan on, the PCM grounds the primary
circuit of the HFC relay. The secondary circuit applies B+ to the cooling fan motor.

Wide Open Throttle A/C Control Relay
This circuit controls the A/C compressor clutch during normal operation. This circuit also

disengages the A/C clutch as commanded by the PCM during Wide Open Throttle (WOT)

conditions. This solid state relay has two control circuits. One is used to engage the A/C clutch
upon demand from the vehicle operator and the A/C cycling pressure switch. The other control is
used to disengage the clutch upon command from the PCM.

Power Ground
This circuit provides the CCRM with a ground source for operating various controls. The circuit

uses one pin that goes to the battery negative terminal.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device
Control Module > Component Information > Locations

Audible Warning Device Control Module: Locations
Instrument Panel View
The Warning Chime Module is located behind center of the instrument panel, RH side of the radio.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device
Control Module > Component Information > Locations > Page 82

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device
Control Module > Component Information > Locations > Page 83

Audible Warning Device Control Module: Description and Operation
Warning Chime Systems
The warning chime module will sound the following warnings:
^ key-in-ignition warning
^ safety belt warning
^ headlamp switch ON warning
Key In Ignition Warning
The warning chime sounds when the LH door is opened with the key in the ignition switch lock

cylinder:
^ The chime continues to sound until the key is removed or the door is closed.
^ When the key is in ignition switch lock cylinder, the ignition key warning switch is closed and

ground is supplied through Circuit 158 (BK/PK) to the warning chime module.
^ When the LH door is open, the door lamp switch closes and power is supplied through Circuit 159

(R/PK) to the module.
Safety Belt Warning
When ignition switch is turned to RUN or START:
^ Power is supplied through Circuit 640 (R/Y) to the warning chime module.
^ The module then supplies power through Circuit 450 (DG/LG) to illuminate the safety belt warning

indicator lamp for up to six seconds, whether or not the LH front safety belt is fastened. If ignition
key is quickly turned to OFF and then back to RUN, the warning lamp will illuminate for less than
six seconds.

^ If the LH front safety belt is not fastened during this time, the safety belt buckle switch remains
closed, supplying ground through Circuit 85 (BR/LB) to the warning chime module and causing it to
sound for six seconds.

Headlamp Switch On Warning
The warning chime sounds when the LH door is opened while the main headlamp switch is in

headlamp or parking lamp position.
^ It continues to sound until the headlamp switch is turned OFF or the door is closed.
^ When the headlamp switch is in headlamp or parking lamp position, power is supplied through

Circuit 14 (BR) to the warning chime module.
^ When the LH door is open, the LH door lamp switch is closed and power is supplied through

Circuit 159 (R/PK) to the module.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device
Control Module > Component Information > Testing and Inspection > Initial Inspection and Diagnostic Overview

Audible Warning Device Control Module: Initial Inspection and Diagnostic Overview

1. Verify the customer's concern by operating the warning chime system to duplicate the condition.

2. Inspect to determine if one of the following electrical concerns apply:
VISUAL INSPECTION CHART
Electrical
^ Check fuse junction panel Fuses 6 (15A), 15 (10A), 5 (15A) or 8 (10A)
^ Check connectors for loose connection damage corrosion
^ Check circuits for shorts/opens.

3. If the inspection reveals obvious concerns that can be readily identified, repair as required. 4. If
the concern(s) remains after the inspection, determine the symptom(s) and go to Symptom Chart.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device
Control Module > Component Information > Testing and Inspection > Initial Inspection and Diagnostic Overview > Page 86

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device
Control Module > Component Information > Testing and Inspection > Initial Inspection and Diagnostic Overview > Page 87

Audible Warning Device Control Module: Pinpoint Tests
A1 - A3
B1 - B5

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device
Control Module > Component Information > Testing and Inspection > Initial Inspection and Diagnostic Overview > Page 88

C1 - C5

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device
Control Module > Component Information > Testing and Inspection > Initial Inspection and Diagnostic Overview > Page 89

E1 - E5

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device
Control Module > Component Information > Testing and Inspection > Page 90

Audible Warning Device Control Module: Service and Repair
REMOVAL
The safety belt warning chime module is mounted to a tongue on the instrument panel lower

reinforcement, near the LH side of the radio.

1. Disconnect battery ground cable. 2. Depress locking tab on warning chime module and slide
module off tongue. 3. Disconnect harness connector to warning chime module. 4. Remove warning
chime module.

INSTALLATION

1. Follow removal procedure in reverse order.

Ford Mustang Workshop Manual (V6-3.8L VIN 4 (1998))
Ford Workshop Manuals > Relays and Modules > Relays and Modules - Instrument Panel > Instrument Panel Control
Module > Component Information > Service and Repair