Communication Problems

Communication problems

Checking the diagnostic trouble codes (DTCs)




- Ignition off
- Check the connectors for the brake control module (BCM) and the body sensor cluster stability sensor (BSC). Check for contact resistance. Check for oxidation
- Ignition on
- Wait approximately 60 seconds
- Read off the status of the diagnostic trouble code (DTC).
If the status of the diagnostic trouble code (DTC) is intermittent, the fault was probably contact resistance or oxidation in the connectors for the control module or the body sensor cluster stability sensor (BSC).

Other information
- To disconnect the connector for the body sensor cluster stability sensor (BSC), see: Accelerometer and yaw angle sensor Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals





Is the status of the diagnostic trouble code (DTC) permanent?

Yes - Checking the wiring

No - FAULT FOUND

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Checking the wiring




- Ignition off
- Connect the breakout box.
Check the wiring between the body sensor cluster stability sensor (BSC) connector
- terminal #1 and brake control module (BCM) terminal #25 (#A25)
- terminal #2 and brake control module (BCM) terminal #29 (#A29)
- terminal #3 and brake control module (BCM) terminal #7 (#A7)
- terminal #5 and brake control module (BCM) terminal #5 (#A5).
Check for an open-circuit or short-circuit to ground and for a short-circuit to each other.
Also check that the body sensor cluster stability sensor (BSC) is correctly installed and that the bracket is secured.
Remedy as necessary.

Other information
- Connecting the breakout box, B5254T7 Connecting the Breakout Box, Brake Control Module (BCM)
- Accelerometer and yaw angle sensor Service and Repair
- Signal description with DSTC, B5254T7 Signal Description With DSTC
- Checking wiring and terminals Checking Wiring and Terminals









Were there any faults in the wiring or in the installation of the body sensor cluster stability sensor (BSC)?

Yes - Verification

No - Checking diagnostic trouble codes (DTCs)

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Checking diagnostic trouble codes (DTCs)








- Ignition off
- Reconnect the components, connectors, etc.
- Test drive the car 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).
The brake control module (BCM) is faulty if the status of the diagnostic trouble code (DTC) is still permanent.
Install the old body sensor cluster stability sensor (BSC). Replace the brake control module (BCM).

Other information

Is the status of the diagnostic trouble code (DTC) permanent?

Yes - FAULT FOUND

No - Fault-tracing information

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Verification




Verification

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








- Ignition off
- Reconnect the connectors, components, etc.
- Test drive the car 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 the status of the diagnostic trouble code (DTC).





Is the status of the diagnostic trouble code (DTC) intermittent?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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Fault-tracing information

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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