Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the wiring and component




- Ignition off.
Check the cable between car-phone control module A13 (terminal #13) and power supply for the handset D7 (terminal #38) for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Try replacing the car-phone handset if no fault is found in the wiring.
Remedy as necessary.

Other information:
- To access or replace the car-phone module, see Telephone module/-control module (PHM), changing Service and Repair
- To access and replace the handset, see Replacing the handset Replacing the Handset
- To connect the breakout box, see Connecting the breakout box. Car phone module Connecting the Breakout Box
- For information about signals and connectors, see Signal description. Phone module (PHM) Signal Specification.













Select "Continue" when the fault has been remedied.

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 car-phone.
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 - Verification completed

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 wiring and component

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