Faulty Signal. Permanent Fault

Faulty signal. Permanent fault

Checking the wiring and component

Hint: The phone module is connected to the telephone antenna via a connector in the right A-pillar.




- Ignition off.
Check the antenna cable between phone module connector F (brown) and connector E (terminal 2) in the right A-pillar for open circuit and short circuit to supply voltage.
Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault

Other information
- Phone module (PHM), replacing Service and Repair
- Antenna carphone, replacing
- Connecting the breakout box. Carphone module Connecting the Breakout Box
- Signal description. Phone module (PHM) Signal Description, Phone Module (PHM)









Was a fault detected?

Yes - Verification

No - Checking the connectors and wiring

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Verification




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 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 - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - 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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the wiring and component

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Checking the connectors and wiring
Raise the secondary lock on the connector in the right A-pillar.
Loosen the primary lock and remove the insulator.
Carefully remove the antenna from the headlining.
Measure the resistance between the signal line and screen ground on the connector. The resistance must be approximately 0 ohms.
Measure the resistance between screen ground and ground. The resistance must be infinite.
Carefully remove the three screws that hold the antenna's circuit board.
Carefully lift up the circuit board from the mounting point so that there is no contact between the circuit board and the casing.
Measure the resistance between the signal line and screen ground. The resistance must be infinite. If the resistance is infinite there is a short-circuit between the signal line and screen ground.
Remedy as necessary.

Other information
- Antenna carphone, replacing
- Connectors, repair Connectors, Repair
- Checking wiring and terminals Checking Wiring And Terminals









Was a fault detected?

Yes - Verification

No - Fault-tracing information

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