Signal Too High/Signal Missing

Signal too high / Signal missing

Checking the component and wiring




- Ignition off
- Disconnect connector A from the phone module (PHM).
Check the cable for the cradle signal. Check for an open-circuit.
Take a reading between control module connector A terminal #8 (#8) and handset connector terminal #4 (#24).
Check control module connector A for the cradle signal. Check for a short-circuit to supply voltage.
Check between:
- terminals #8 (#8) and #7 (#7)
- terminals #8 (8) and #5 (#5).
Try replacing the handset or holder if the cable is OK.
Remedy as necessary.

Other information:
- The cradle signal is approximately 5 V when the handset is not in the cradle
- The cradle signal is approximately 0 V when the handset is in the cradle
- For further information about the fuses and relays, see the Wiring Diagram
- Connecting the breakout box Connecting the Breakout Box, Phone Module (PHM)
- Location of components Locations
- Phone module (PHM), replacing Phone Module (PHM), Replacing
- 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
- Activate 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 the component and wiring

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