Communication Fault
Communication fault
Checking for permanent or intermittent faults
- Ignition on.
Attempt to operate the sun roof.
Can the sun roof be operated?
Yes - Intermittent fault
No - Checking the connectors
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Checking the connectors
- Ignition off
- Remedy the connectors for the cable harness, sun roof control module and upper electronic module (UEM) for contact resistance and oxidation.
In particular, check for any damage
- Reinstall the components, reconnect the connectors etc.
- Ignition on.
Operate the sun roof.
Other information:
- To access the connector for the upper electronic module (UEM), see Upper electronic module (UEM) rear view / door mirror, replacing Service and Repair
- To access the sun roof connector, see Sun roof module (SRM), replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals.
Do the sun roof controls operate?
Yes - Verification
No - Checking for open-circuits and short-circuits
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Checking for open-circuits and short-circuits
Check the cable between the upper electronic module (UEM) terminal #21 and the sun roof module (SRM) terminal #4. Check for a short-circuit to ground. Check for an open-circuit. Check for a short-circuit to supply voltage.
Remedy as necessary.
Other information
- For further information about signals and other values, see Signal specification Signal Specification, Upper Electronic Module (UEM)
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access the sun roof control module, see Sun roof module (SRM), replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals.
Was a fault detected?
Yes - Verification
No - No Fault Found
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Intermittent fault
Check the connectors for the upper electronic module (UEM) and the sun roof module (SRM). Check for contact resistance and oxidation. Check for loose connections.
Check the cable between the upper electronic module (UEM) terminal #21 and the sun roof module (SRM) terminal #4. Check for an intermittent short-circuit to ground. Check for an intermittent open-circuit. Check for an intermittent short-circuit to supply voltage.
Other information:
- For further information about signals and other values, see Signal specification Signal Specification, Upper Electronic Module (UEM)
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access the sun roof control module, see Sun roof module (SRM), replacing Service and Repair
- To access the connector for the upper electronic module (UEM), see Upper electronic module (UEM) rear view / door mirror, replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals.
Continue - Fault-tracing information
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Verification
Verification
Verification
Hint: After the repair it is necessary to check that the fault has been rectified.
- Ignition off.
- Connect connector, install components etc.
- Ignition on.
Try to move the sunroof.
Does the sunroof move?
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 for permanent or intermittent faults
FAULT-TRACING FAILED - No Fault Found
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Fault-tracing information
Information
Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).
Do you want to view the information again?
Yes - Attempt New Test
No - Fault Found
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Attempt New Test - Checking for permanent or intermittent faults
FAULT FOUND - Fault Found
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