Faulty Signal

Faulty signal

Checking the connectors on the brake control module (BCM) and wheel sensor








- Ignition off
- Check the connectors on the brake control module (BCM) and the wheel sensor. Check for contact resistance. Check for oxidation

Note! Check to see if the wheel sensor cable is fault-free and correctly installed. A defective lead must be replaced, repair is not allowed. For information on correct mounting: Transmission input speed sensor, front wheels Transmission Input Speed Sensor, Front Wheels

- Reinstall the components, connectors, etc.
- Raise the car so that the relevant wheel is clear of the ground
- Ignition on
- Read off the wheel speed for the relevant wheel.
Spin the relevant wheel and check that the wheel speed is updated.
If the wheel speed is updated, the cause of the fault was loose connections in the connectors on the brake control module (BCM) or wheel sensor.

Note! The speed signal will only be active for approximately 20 seconds. Activate the function again if necessary.

Other information
- Transmission input speed sensor rear wheels Transmission Input Speed Sensor Rear Wheels
- Transmission input speed sensor, front wheels Transmission Input Speed Sensor, Front Wheels
- Anti-lock Brake System Module (ABS) Anti-Lock Brake System Module (ABS)
- Checking wiring and terminals Checking Wiring and Terminals





Is the wheel speed updated?

Yes - Troubleshooting procedure complete

No - Checking the wiring and sensors

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Checking the wiring and sensors

Note! Check to see if the wheel sensor cable is fault-free and correctly installed. A defective lead must be replaced, repair is not allowed. For information on correct mounting: Transmission input speed sensor, front wheels Transmission Input Speed Sensor, Front Wheels








Checking the power supply
Check the signal cable between the brake control module (BCM)
- terminal #45 (#A45) (left front)
- #34 (#A34) (right front).
and terminal #1 on the relevant sensor. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Checking the signal cable
Check the signal cable between the brake control module (BCM)
- terminal #46 (#A46) (left front)
- #33 (#A33) (right front).
and terminal #2 on the relevant sensor. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Remedy as necessary.

Other information:
- Connecting the breakout box Connecting the Breakout Box, Brake Control Module (BCM)
- Transmission input speed sensor rear wheels Transmission Input Speed Sensor Rear Wheels
- Transmission input speed sensor, front wheels Transmission Input Speed Sensor, Front Wheels
- Signal description with ABS/STC Signal Description with ABS/STC
- Signal description with DSTC Signal Description with DSTC
- Checking wiring and terminals Checking Wiring and Terminals









Continue - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the components, connectors, etc.
- Raise the car so that the relevant wheel is clear of the ground
- Ignition on
- Read off the wheel speed for the relevant wheel.
Spin the relevant wheel and check that the wheel speed is updated.

Note! The speed signal will only be active for approximately 20 seconds. Activate the function again if necessary.





Is the wheel speed updated?

Yes - Troubleshooting procedure complete

No - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit Fault-Tracing

No - Attempt New Test

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Attempt New Test - Checking the connectors on the brake control module (BCM) and wheel sensor

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