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sean
sean, Ford Technician
Category: Ford
Satisfied Customers: 3105
Experience:  Ford Master Technician.
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Hi have a 2003 Mk3 mondeo 2lt petrol automatic The cruise

Resolved Question:

Hi have a 2003 Mk3 mondeo 2lt petrol automatic
The cruise control isn't working have replaced brake switches steering wheel switches clock spring and control module the cruise control light comes on briefly when the ignition is turned on, have had a diagnostic check no faults recorded HELP
Submitted: 3 years ago.
Category: Ford
Expert:  sean replied 3 years ago.

Hello, I'm sorry nobody has given you an answer sooner, I hope the following assists you.

From the description you've given this is probably a wiring fault, I'll post the diagnostic procedure as best as I can below as it is quite long and varies depending on the results.

The images of the connectors will be missing but if you need help with these let me know and I'll post the ones you need, it would take a long time to do each individual one.





















































































































































1
Disconnect Speed Control Actuator C175.


2
Ignition ON.


Click to resize V3305114


3
Measure the voltage between the speed control actuator
C175 pin 7, circuit 15-PG12 (GN/WH), harness side and ground.

Is the voltage greater than 10 volts?
Yes
GO to
A2
.
No
REPAIR the circuit. TEST the system for normal
operation.
A2: CHECK CIRCUIT 31-PG12 (BK) TO
GROUND


1
Ignition OFF.


Click to resize V3305113


2
Measure the resistance between the speed control
actuator C175 pin 10, circuit 31-PG12 (BK), harness side and
ground.

Is the resistance less than 5 ohms?
Yes
GO to
A3
.
No
REPAIR the circuit. TEST the system for normal
operation.
A3: CHECK CIRCUIT 8-PG13 (WH) FOR
VOLTAGE


1
Ignition ON.


Click to resize E0031080


2
Measure the voltage between the speed control actuator
C175 pin 5, circuit 8-PG13 (WH), harness side and ground.

With the speed control ON switch pressed, is the
voltage greater than 10 volts?
Yes
GO to
A8
.
No
GO to
A4
.
A4: CHECK CIRCUIT 15-PG13 (GN/YE) FOR
VOLTAGE

warningWARNING: To deactivate the air bag module, refer to the procedure in
Section 501-20B for the correct air bag module deactivation procedure. Failure
to follow this instruction may result in personal injury.



1
Remove the driver air bag module,
REFER to: Driver Airbag (501-20B Supplemental Restraint
System, Removal and Installation).


2
Disconnect Clockspring C413.


3
Connect the battery ground cable.


4
Ignition ON.


Click to resize E0031081


5
Measure the voltage between the clockspring C413 pin 7,
circuit 15-PG13 (GN/YE), harness side and ground.

Is the voltage greater than 10 volts?
Yes
GO to
A5
.
No
REPAIR the circuit. TEST the system for normal
operation.
A5: CHECK CIRCUIT 8-PG13 (WH) FOR OPEN
CIRCUIT


1
Ignition OFF.


Click to resize E0031082


2
Measure the resistance between the clockspring C413 pin
5, circuit 8-PG13 (WH), harness side and the speed control actuator C175 pin 5,
circuit 8-PG13 (WH), harness side.

Is the resistance less than 5 ohms?
Yes
GO to
A6
.
No
REPAIR the circuit. TEST the system for normal
operation.
A6: CHECK THE CLOCKSPRING FOR OPEN
CIRCUIT


1
Disconnect Speed Control Switch.


Click to resize E0031083


2
Measure the resistance between the clockspring pin 5,
component side and the clockspring to speed control switch
connector.

Is the resistance less than 1 ohms?
Yes
GO to
A7
.
No
INSTALL a new clockspring,
REFER to: Clockspring (501-20B Supplemental Restraint
System, Removal and Installation).
TEST the system for normal
operation.
A7: CHECK THE CLOCK SPRING FOR OPEN
CIRCUIT


Click to resize E0031084


1
Measure the resistance between the clockspring pin 7,
component side and the clockspring to speed control switch
connector.

Is the resistance less than 1 ohms?
Yes
INSTALL a new speed control switch.
REFER to: Speed Control Switch (310-03 Speed Control,
Removal and Installation).
TEST the system for normal operation.
No
INSTALL a new clockspring,
REFER to: Clockspring (501-20B Supplemental Restraint
System, Removal and Installation).
TEST the system for normal
operation.
A8: CHECK CIRCUIT 15S-PG16 (GN/YE) FOR
VOLTAGE


Click to resize V3305115


1
Measure the voltage between the speed control actuator
C175 pin 9, circuit 15S-PG16 (GN/YE), harness side and ground.

Is the voltage greater than 10 volts?
Yes
GO to
A11
.
No
GO to
A9
.
A9: CHECK CIRCUIT 15-PG6 (GN/YE) FOR
VOLTAGE


1
Ignition OFF.


2
Disconnect BPP switch C406.


3
Ignition ON.


Click to resize E0031085


4
Measure the voltage between the BPP switch C406 pin 2,
circuit 15-PG6 (GN/YE), harness side and ground.

Is the voltage greater than 10 volts?
Yes
GO to
A10
.
No
REPAIR the circuit. TEST the system for normal
operation.
A10: CHECK CIRCUIT 15S-PG16 (GN/YE) FOR OPEN
CIRCUIT


1
Ignition OFF.


Click to resize V3305118


2
Measure the resistance between the speed control
actuator C175 pin 9, circuit 15S-PG16 (GN/YE), harness side and the BPP switch
C406 pin 1, circuit 15S-PG16 (GN/YE), harness side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new BPP switch. TEST the system for normal
operation.
No
REPAIR the circuit. TEST the system for normal
operation.
A11: CHECK CIRCUIT 15S-PG17 (GN/BU) TO
GROUND


Click to resize E0031086


1
Measure the resistance between the speed control
actuator C175 pin 4, circuit 15S-PG17 (GN/BU), harness side and
ground.

Is the resistance less than 5 ohms?
Yes
GO to
A14
.
No
Vehicles with manual transaxle, GO to A12. Vehicles with automatic
transaxle, REPAIR the circuit. TEST the system for normal operation.
A12: CHECK CIRCUIT 15S-PG7 (GN/BU) TO
GROUND


1
Disconnect CPP switch C414.


Click to resize E0031087


2
Measure the resistance between the CPP switch C414 pin
3, circuit 15S-PG7 (GN/BU), harness side and ground.

Is the resistance less than 5 ohms?
Yes
GO to
A13
.
No
REPAIR the circuit. TEST the system for normal
operation.
A13: CHECK CIRCUIT 15S-PG17 (GN/BU) FOR OPEN
CIRCUIT


Click to resize E0031088


1
Measure the resistance between the CPP switch C414 pin
1, circuit 15S-PG17 (GN/BU) harness side and the speed control actuator C175 pin
4, circuit 15S-PG17 (GN/BU), harness side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new CPP switch. TEST the system for normal
operation.
No
REPAIR the circuit. TEST the system for normal
operation.
A14: CHECK THE VEHICLE SPEED SENSOR (VSS) FOR
CORRECT OPERATION


1
Check the trip computer and speedometer for correct
operation.

Is the instrument cluster working correctly?
Yes
GO to
A15
.
No

REFER to: Instrument Panel Cluster (IPC) (413-01
Instrument Panel Cluster (IPC), Diagnosis and Testing).
A15: CHECK CIRCUIT 8-PG18 (WH/BU) FOR OPEN
CIRCUIT


1
Disconnect PCM C100.


Click to resize E0031089


2
Measure the resistance between the PCM C100 pin 28,
circuit 8-GB8 (WH/BU), harness side and the speed control module C175 pin 3,
circuit 8-PG18 (WH/BU), harness side.


Is the resistance less than 5 ohms?
Yes
INSTALL a new speed control actuator.
REFER to: Speed Control Actuator (310-03 Speed
Control, Removal and Installation).
TEST the system for normal
operation.
No
REPAIR the circuit(s). TEST the

system for normal
operation.

Customer: replied 3 years ago.

Hi thanks for your answer a great help although I can't open the images. I have tested the two switches on the brake pedal and the brake lights work perfectly, have removed other switch from the car and tested and works ok the question is should this switch have a live feed when the ignition is switched on as I can't get a live from the connection plug, is this dependent on gear selection position or has been suggested a pulse feed

Expert:  sean replied 3 years ago.

Hello again,

I did say the images were missing and I can post individual images if you need them.

The brake pedal position switch should have 12 volts at ignition on at pin 2 (green/yellow) this is taken from the stop lamp switch which is fed by fuse 93 in the fuse box inside the car.

Let me know if I can assist further.

Best wishes,

Sean.

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