Faulty Signal [2 of 4]

Checking cable and component PHM





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

Other information
- Phone Module (PHM) Service and Repair
- Checking the supply voltage/ground terminal Checking Voltage/Ground Terminal, Phone Module (PHM)
- Signal specification Signal Specification, Phone Module (PHM)
- Fiber optic cable harness, repairing
- Diagnostic Instructions - Fibre Optic Cable
- Location of components Component Location, Infotainment





Continue - Verification

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Checking cable and component AUD





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

Other information
- Audio Module Audio Module
- Checking the supply voltage/ground terminal Checking Supply Voltage/Ground Terminal, Audio Module (AUD)
- Signal specification Signal Specification, Audio Module (AUD)
- 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, Remote Digital Audio Receiver (RDAR)





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. Disconnect the MOST connector from Remote Digital Audio Receiver (RDAR).
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.
The communication on the MOST network is working if the menu text is displayed. The cause of the fault is then in the Remote Digital Audio Receiver (RDAR). Continue the 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 power supply and ground connection for the Remote Digital Audio Receiver (RDAR).
- Inspect the MOST connection for dirt, loose contacts and damage.
- If no fault is found, replace the Remote Digital Audio Receiver (RDAR).
Remedy as necessary.

Other information
- Location of components Component Location, Infotainment
- Checking the supply voltage/ground terminal Checking Voltage/Ground Terminal, Remote Digital Audio Receiver (RDAR)
- Signal specification Pinout Values and Diagnostic Parameters
- Fiber optic cable harness, repairing
- Diagnostic Instructions - Fibre Optic Cable
- Satellite radio control module Satellite Radio Control Module





Continue - Verification

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