Troubleshooting

Troubleshooting BCM-U012587

Checking for contact resistance and oxidation




- Ignition off
- Check the connectors of the brake control module (BCM) and AYC sensor for contact resistance and oxidation.
- Reinstall the components, reconnect the connectors etc.
- Test-drive the vehicle according to: Test Drive Form (DSTC (dynamic stability and traction control) /brake control module), description Test Drive Form (DSTC (Dynamic Stability and Traction Control)/Brake Control Module), Description

Note! Do not turn off the ignition between test-driving and reading out diagnostic trouble codes. This is to obtain the correct status of the diagnostic trouble codes.

- Read out the diagnostic trouble code's status without turning off the ignition after the test-drive.
If the status of the diagnostic trouble code is intermittent, the malfunction was probably caused by contact resistance or oxidation in the connectors of the control module or AYC sensor.

Other information
- Active yaw control sensor, replacing Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals.





Is the status of the diagnostic trouble code intermittent?

Yes - FAULT FOUND

No - Checking the wiring

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Checking the wiring




- Ignition off
Check the cables for an open circuit.
Measure between:
- AYC sensor terminal #1 and brake control module (BCM) terminal #25 (#A25).
- AYC sensor terminal #2 and brake control module (BCM) terminal #29 (#A29).
- AYC sensor terminal #3 and brake control module (BCM) terminal #6 (#A6).
- AYC sensor terminal #5 and brake control module (BCM) terminal #39 (#A39).
Also check that the AYC sensor is properly installed and that the bracket is properly secured.
If the cables are OK and the AYC sensor is properly installed, replace the AYC sensor.

Other information
- Signal specification, brake control module (BCM) with DSTC (dynamic stability and traction control), B8444S, B6324S Signal Specification
- Active yaw control sensor, replacing Service and Repair
- 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 malfunction has been remedied.








- Ignition off
- Reconnect the connectors, components, etc.
- Test-drive the vehicle according to Test Drive Form (DSTC (dynamic stability and traction control) /brake control module), description Test Drive Form (DSTC (Dynamic Stability and Traction Control)/Brake Control Module), Description.

Note! Do not turn off the ignition between test-driving and reading out diagnostic trouble codes. This is to obtain the correct status of the diagnostic trouble codes.

Then read out the diagnostic trouble code's status without turning off the ignition after the test-drive.





Is the status of the diagnostic trouble code intermittent?

Yes - Troubleshooting procedure complete

No - Troubleshooting information

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Troubleshooting 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 for contact resistance and oxidation

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