Faulty Signal. Permanent Fault

Faulty signal. Permanent fault

Checking fuse
Check that the car-phone fuse #18 in the passenger compartment fusebox is not half burned by trying a new fuse.

Other information:
- To access/replace the fuse, see Fusebox, passenger compartment, replacing Fusebox, Passenger Compartment, Replacing.
If the car-phone is now OK, the fault was due to a bad fuse.

Is the car-phone OK?

Yes - FAULT FOUND

No - Checking power supply

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Checking power supply
Measure the power supply to the keypad/car-phone module between #A6 and the battery positive terminal.
Measure battery voltage.
If the difference is less than 2.5 V between the car-phone power supply and battery voltage there is an internal fault in the keypad/car-phone module. If the difference is greater than 2.5 V the fault is in the power cable.
Remedy as necessary.

Other information:
- To access/replace the keypad unit/car-phone control module, see Radio cassette player, replacing Radio Cassette Player, 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 specification, Keypad unit / car-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 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 diagnostic trouble codes (DTCs).
Check that the relevant diagnostic trouble code (DTC) has switched status from permanent to intermittent fault.





Has the diagnostic trouble code (DTC) status 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 fuse

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