Troubleshooting
Troubleshooting BCM-U012588
Checking the diagnostic trouble codes (DTCs)
- Ignition off
- Check the connectors of the brake control module (BCM) and AYC sensor for contact resistance and oxidation.
- Ignition on
- Wait approximately 60 seconds.
- Read the status of the diagnostic trouble code.
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 permanent?
Yes - Checking the wiring
No - FAULT FOUND
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Checking the wiring
- Ignition off
- Connect a breakout box.
Check the cables for open circuit, short circuit to ground and short circuit to supply voltage.
Measure between:
- AYC sensor connector terminal #1 and brake control module (BCM) terminal #25 (#A25).
- AYC sensor connector terminal #2 and brake control module (BCM) terminal #29 (#A29).
- AYC sensor connector terminal #3 and brake control module (BCM) terminal #6 (#A6).
- AYC sensor connector 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, try a new AYC sensor.
Other information
- Connecting the breakout box, brake control module (BCM), B6324S5 Connecting The Breakout Box
- Signal specification, brake control module (BCM) with DSTC (dynamic stability and traction control), B6324S5 Signal Specification, Brake Control Module (BCM) With DSTC (Dynamic Stability And Traction Control).
- Active yaw control sensor, replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals
Were there any defects in the cables or the AYC sensor installation?
Yes - Verification
No - Checking the diagnostic trouble code
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Checking the diagnostic trouble code
- 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.
- Ignition on
- Read off diagnostic trouble codes (DTCs).
If the status of the diagnostic trouble code is still permanent, the brake control module (BCM) is defective.
Reinstall the old AYC sensor and replace the brake control module (BCM)
Other information
- Brake Control Module (BCM), replacing Service and Repair
Is the diagnostic trouble code status permanent?
Yes - FAULT FOUND
No - 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 - VERIFIED
No - VERIFICATION FAILED
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VERIFICATION FAILED - Troubleshooting information
VERIFIED - FAULT FOUND
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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 the diagnostic trouble codes (DTCs)
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Information
Fault-tracing information
The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.
Complete the fault-tracing for those fault or try again.
Do you want to terminate fault-tracing at this time?
Yes - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Checking the diagnostic trouble codes (DTCs)
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