Checking the Headset Panel

Checking the headset panel

Fault-tracing information

Hint: Check that the headsets used are functioning.

If there is no sound in the headsets it may be caused by:
- Open-circuit in the signal cable between the audio module (AUM) and the headset
- Oxidation on the terminal pins in the connectors
- Defective headset panel
- Problems with the MOST network
- Defective control module.

Hint: If there is no sound from any of the four headset outputs, the fault is probably before the headset panel. Check that the 22-pin connector is connected to the audio module (AUD). Check that the MOST network to which the Audio module (AUD) is connected functions.

Select an option:
1. left headset panel
2. right headset panel.

Which headset panel is not functioning?

1 - left headset panel

2 - right headset panel

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Checking the cable, left headset panel

Hint: Turn up the volume for the headset output which does not function. If the volume changes the fault has been remedied.




- Ignition off
- Disconnect the 22-pin connector for the audio module (AUD)
- Disconnect the connector for the left headset panel.

Checking the cable
Check that the headset panel connectors are correctly connected. Check the cable terminals. Check for contact resistance, loose connections and oxidation. Check the cable terminals in the female and male sections of the connector. The cable terminals must not be damaged or pressed back

Checking the signal cable to headset output 1, left-hand headset panel
Check the cable between audio module (AUD) terminal #C1 and headset terminal #1 in the left C-post. Check for a short-circuit to ground, for a short-circuit to supply and for an open-circuit.
Check the cable between audio module (AUD) terminal #C2 and headset terminal #3 in the left C-post. Check for a short-circuit to ground, for a short-circuit to supply and for an open-circuit.
Check the cable between audio module (AUD) terminal #C13 and headset terminal #2 in the left C-post. Check for a short-circuit to ground, for a short-circuit to supply and for an open-circuit.

Checking the signal cable to headset output 2, left-hand headset panel
Check the cable between audio module (AUD) terminal #C3 and headset terminal #5 in the left C-post. Check for a short-circuit to ground, for a short-circuit to supply and for an open-circuit.
Check the cable between audio module (AUD) terminal #C4 and headset terminal #7 in the left C-post. Check for a short-circuit to ground, for a short-circuit to supply and for an open-circuit.
Check the cable between audio module (AUD) terminal #C14 and headset terminal #6 in the left C-post. Check for a short-circuit to ground, for a short-circuit to supply and for an open-circuit.
If no fault is found, replace the headset panel.
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
- For information about signals, see Signal specification Signal Specification, Audio Module (AUM)
- Checking wiring and terminals Checking Wiring and Terminals.









Was a fault detected?

Yes - Verification

No - No Fault Found

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Checking the cable, right headset panel




- Ignition off
- Disconnect the 22-pin connector for the audio module (AUD)
- Disconnect the connector for the right headset panel.

Hint: Turn up the volume for the headset output which does not function. If the volume changes the fault has been remedied.

Checking the cable
Check that the headset panel connectors are correctly connected. Check the cable terminals. Check for contact resistance, loose connections and oxidation. Check the cable terminals in the female and male sections of the connector. The cable terminals must not be damaged or pressed back

Checking the cable to headset output 3, right-hand headset panel
Check the cable between audio module (AUD) terminal #C7 and headset terminal #1 in the right C-post. Check for a short-circuit to ground, for a short-circuit to supply and for an open-circuit.
Check the cable between audio module (AUD) terminal #C8 and headset terminal #3 in the right C-post. Check for a short-circuit to ground, for a short-circuit to supply and for an open-circuit.
Check the cable between audio module (AUD) terminal #C18 and headset terminal #2 in the right C-post. Check for a short-circuit to ground, for a short-circuit to supply and for an open-circuit.

Checking the cable to headset output 4, right-hand headset panel
Check the cable between audio module (AUD) terminal #C9 and headset terminal #5 in the right C-post. Check for a short-circuit to ground, for a short-circuit to supply and for an open-circuit.
Check the cable between audio module (AUD) terminal #C10 and headset terminal #7 in the right C-post. Check for a short-circuit to ground, for a short-circuit to supply and for an open-circuit.
Check the cable between audio module (AUD) terminal #C19 and headset terminal #6 in the right C-post. Check for a short-circuit to ground, for a short-circuit to supply and for an open-circuit.
If no fault is found, replace the headset panel.
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
- For information about signals, see Signal specification Signal Specification, Audio Module (AUM)
- Checking wiring and terminals Checking Wiring and Terminals.









Was a fault detected?

Yes - Verification

No - No Fault Found

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied. Check that the headsets to be used function before verification is carried out.




- Ignition on
- Connect the headset to the output in the headset panel which did not function
- Switch on the radio or CD/MD player
- Press the SEL button to select the sound source for the output in the headset panel to be tested.
Increase and decrease the volume on the headset panel for the selected output.

Is there sound?

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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