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
- Signal specification Signal Specification, Phone Module (PHM)
- Connecting the breakout box Connecting the Breakout Box, Phone Module (PHM)
- Location of components Location of Components, Phone Module (PHM)
- Phone Module (PHM) Phone Module (PHM)
- Telephone handset Telephone Handset
- Checking wiring and terminals Checking Wiring and Terminals













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 the 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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