Faulty Signal [3 of 4]

Checking cable and component




- Ignition off
- Unplug the MOST cable connector from the infotainment module (TCM).
- Ignition on
- Activate the infotainment system.
Visually check that the infotainment control module (TCM) emits light from the MOST connector.
If no light is emitted by the infotainment control module (ICM) then the control module is damaged.
If the infotainment module (ICM) does emit light, the fault lies in the MOST cable to the next control module.
Inspect the MOST connection for dirt, loose contacts and damage.
If no fault can be found in the MOST connection, change the MOST cable.
Remedy as necessary.

Other information
- Information and Entertainment Display Service and Repair
- Fiber optic cable harness, repairing
- Location of components Component Location, Infotainment

Continue - Verification

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Checking cable and component





Checking fuses
Check that the fuse for the function in question is intact.
Replace the fuse if it is damaged.
For information about fuses, see the wiring diagram.

Checking the cause of the fault
Check the cause of the fault as follows:
1. Ignition off
2. Unplug the MOST connector from the multimedia module (MMM).
3. Connect the MOST cable to special tool 951 2867 MOST instrumentation 951 2867 MOST Instrumentation.
4. Ignition on
5. Activate the infotainment system.
6. Check that MOST network communication is in working order. Do this by obtaining a status reading of the MOST locked parameter for at least 30 seconds. This parameter shows whether the MOST network is closed and communication possible. Click on the VCT2000 symbol to obtain a MOST network status reading.
7. If the parameter shows that the MOST network is not closed, check the receiving control module in the same way as described above.
If menu text is displayed, communication on the MOST network is OK. The cause of the fault then lies in the multimedia module (MMM). Continue fault tracing by checking the component.
If menu text is not displayed, communication on the MOST network is not OK. The cause of the fault then lies in the next control module. Continue fault tracing by checking the fiberoptic cable.

Checking the cable
- Inspect the MOST connection for dirt, loose contacts and damage.
- If no fault can be found in the MOST connection, change the MOST cable.

Checking the component
- Check the multimedia module (MMM) power supply and ground connection.
- Inspect the MOST connection for dirt, loose contacts and damage.
- If no fault can be found, change the multimedia module (MMM).
Remedy as necessary.

Other information
- Control module information and entertainment Control Module Information And Entertainment
- Checking the voltage / ground terminal Checking Supply Voltage/Ground Terminal, Multimedia Module (MMM)
- Signal specification Signal Specification, Multimedia Module (MMM)
- Fiber optic cable harness, repairing
- Diagnostic Instructions - Fibre Optic Cable
- Location of components Component Location, Infotainment





Continue - Verification

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Checking cables and components, Integrated Audio Module (IAM)





Checking fuses
Check that the fuse for the function in question is intact.
Replace the fuse if it is damaged.
For information about fuses, see the wiring diagram.

Checking the cause of the fault
Check the cause of the fault as follows:
1. Ignition off
2. Unplug the MOST connector from the integrated audio module (IAM).
3. Connect the MOST cable to special tool 951 2867 MOST instrumentation 951 2867 MOST Instrumentation.
4. Ignition on
5. Activate the infotainment system.
6. Check that MOST network communication is in working order. Do this by obtaining a status reading of the MOST locked parameter for at least 30 seconds. This parameter shows whether the MOST network is closed and communication possible. Click on the VCT2000 symbol to obtain a MOST network status reading.
7. If the parameter shows that the MOST network is not closed, check the receiving control module in the same way as described above.
If menu text is displayed, communication on the MOST network is OK. The cause of the fault then lies in the integrated audio module (IAM). Continue fault tracing by checking the component.
If menu text is not displayed, communication on the MOST network is not OK. The cause of the fault then lies in the next control module. Continue fault tracing by checking the fiberoptic cable.

Checking the cable
- Inspect the MOST connection for dirt, loose contacts and damage.
- If no fault can be found in the MOST connection, change the MOST cable.

Checking the component
- Check the integrated audio module (IAM) power supply and ground connection.
- Inspect the MOST connection for dirt, loose contacts and damage.
- If no fault can be found, change the integrated audio module (IAM).
Remedy as necessary.

Other information
- General audio player module Service and Repair
- Checking the supply voltage/ground terminal Checking Supply Voltage/Ground Terminal, Integrated Audio Module (IAM)
- Signal specification Signal Specification, Integrated Audio Module (IAM)
- Fiber optic cable harness, repairing
- Diagnostic Instructions - Fibre Optic Cable
- Location of components Component Location, Infotainment





Continue - Verification

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