Signal Too High or Signal Missing

Signal too high or signal missing

Checking components and wiring
Check the signal cable for the microphone between phone module (PHM) connector B terminal #14 (#56) and handset connector terminal #2 (#22). Check for a short-circuit to supply voltage.
Check the signal cable for the microphone between phone module (PHM) connector B terminal #14 (#56) and handset connector terminal #2 (#22). Check for an open-circuit.
Check the connectors for loose connections, damaged or bent terminal pins and oxidation.
Try replacing the carphone handset if no fault is found in the wiring.
Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Phone Module (PHM)
- For information about signals and connectors, see Signal specification Signal Specification, Phone Module (PHM)
- To access or replace the control module, see Phone module (PHM), replacing Phone Module (PHM), Replacing
- To access or replace the handset, see Handset, replacing Handset, Replacing
- Checking wiring and terminals Checking Wiring and Terminals.













Select Continue.

Continue - Verification

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Verification




Verification

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








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Switch on the carphone.
Make a call so that both the handset and the hands-free system are used. See instruction manual.
Ignition off.
Ignition on.
Read off the diagnostic trouble codes (DTCs).
Check that the relevant diagnostic trouble code (DTC) has switched status from permanent to intermittent fault.





Has the status of the diagnostic trouble code (DTC) changed?

Yes - Troubleshooting procedure complete

No - Fault-tracing information

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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 - Exit Fault-tracing

No - Attempt New Test

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Attempt New Test - Checking components and wiring

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