Faulty Signal

Faulty signal

Checking the connectors for the control module 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
- 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 the 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 - FAULT FOUND

No - Checking the wiring and sensors

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Checking the wiring and sensors
Checking the power supply
Check the power supply cable between the brake control module (BCM)
- terminal #36 (#A36) (left rear)
- terminal #43 (#A43) (right rear).
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.

Hint: With the ignition on, the voltage must be approximately 1 V below Ubat measured at the ground terminal.

Checking the signal cable
Check the power supply cable between the brake control module (BCM)
- terminal #37 (#A37) (left rear)
- terminal #42 (#A42) (right rear).
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, B5254T7 Connecting the Breakout Box, Brake Control Module (BCM)
- Signal description with ABS/STC, B5254T7 Signal Description With ABS/STC
- Signal description with DSTC, B5254T7 Signal Description With DSTC
- Transmission input speed sensor rear wheels Transmission Input Speed Sensor Rear Wheels
- Transmission input speed sensor, front wheels Transmission Input Speed Sensor, Front Wheels
- 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 - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - 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 for the control module and wheel sensor

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