Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the wiring and component

Hint: The Hands-free loudspeaker is connected to the car-phone module via a connector under the driver's seat




- Ignition off.
Check the cable between car-phone module connector A5 (terminal #5) and the hands-free loudspeaker connector B9 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the cable between car-phone module connector A4 (terminal #4) and the hands-free loudspeaker connector B10 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Try replacing the hands-free loudspeaker 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 or replace the hands-free unit, see Hands-free equipment, replacing Hands-Free Equipment, Replacing
- 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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