Checking the Microphone

Checking the microphone

Fault-tracing information
Fault causes which will stop the microphone working:
- Defective microphone
- Short-circuit to supply voltage in the signal cable between the microphone and the audio module (AUD)
- Defective audio module (AUD)
- Problems with the MOST network.

Hint: Check that the MOST network is working before beginning fault-tracing.

Note! Check that no diagnostic trouble codes (DTCs) are stored in the audio module (AUD) or the infotainment control module (ICM) and that other tests have been completed before fault-tracing.

Have all tests been completed and no diagnostic trouble codes (DTCs) are stored?

Yes - Checking the cable

No - Complete other tests before continuing

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Checking the cable




- Ignition off
- Disconnect the connector for the microphone in the rear view mirror.
Check the cable terminals. Check for contact resistance and oxidation. Check the female and male sections of the connector. The cable terminals must not be damaged or pressed back.
Check the signal cable between audio module (AUD) terminal #B8 and microphone terminal #A2 (pin B). Check for a short-circuit to supply voltage.
Check the signal cable between audio module (AUD) terminal #B16 and microphone terminal #A1 (pin A). Check for a short-circuit to supply voltage.
Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Audio Module (AUD)
- To access or replace the audio module (AUD), see Audio module (AUD), replacing Audio Module (AUD), Replacing
- To access or replace the microphone, see Microphone, replacing Microphone, Replacing
- For information about signals, see Signal specification Signal Specification, Audio Module (AUM)
- Checking wiring and terminals Checking Wiring and Terminals.













Continue - Verification

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Verification




Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Check that the microphone input functions by activating the microphone appropriately. Make a telephone call using the handsfree system or use the voice control function.

Does the microphone function?

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 - Fault-tracing information

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