Communication Problems
Communication problems
Checking diagnostic trouble codes (DTCs)
- Ignition off
- Check the connectors for the brake control module (BCM) and the active yaw control sensor. Check for contact resistance and 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 cause of the fault was probably contact resistance or oxidation in the connectors for the control module or the active yaw control sensor.
Other information
- To disconnect the connector for the active yaw control sensor, see Active yaw control sensor, replacing Active Yaw Control Sensor, Replacing
- 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 connector for the active yaw control sensor
- terminal #1 and control module terminal #25 (terminal #A25)
- terminal #2 and control module terminal #29 (terminal #A29)
- terminal #3 and control module terminal #6 (#A6)
- terminal #5 and control module terminal #39 (terminal #A39).
check for an open-circuit or short-circuit to ground and for a short-circuit to each other.
Also check that the active yaw control sensor is correctly installed and that the bracket is secured.
If the cables are OK, try a new active yaw control sensor.
Other information
- To connect the breakout box, see Connecting the breakout box, brake control module (BCM) Connecting the Breakout Box, Brake Control Module (BCM)
- To access and replace the active yaw control sensor, see Active yaw control sensor, replacing Active Yaw Control Sensor, Replacing
- For information about signals, see Signal specification, brake control module (BCM) with DSTC (dynamic stability and traction control) Signal Specification
- Checking wiring and terminals Checking Wiring And Terminals.
Were there any faults in the wiring or in the installation of the active yaw control sensor?
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. See 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 active yaw control sensor and replace the control module
Other information
- To replace the control module, see Brake Control Module (BCM), replacing Brake Control Module (BCM), Replacing.
Is the status of the diagnostic trouble code (DTC) permanent?
Yes - Fault Found
No - Fault-tracing information
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Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reconnect the connectors, reinstall components etc.
- Test drive the car. See 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
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 - FAULT-TRACING FAILED
No - Attempt New Test
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Attempt New Test - Checking diagnostic trouble codes (DTCs)
FAULT-TRACING FAILED - FAULT-TRACING FAILED
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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 - FAULT-TRACING FAILED
No - Attempt New Test
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Attempt New Test - Checking diagnostic trouble codes (DTCs)
FAULT-TRACING FAILED - FAULT-TRACING FAILED
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