Part 2

Checking cable and component





Checking the fault cause
Check the fault cause as follows:
1. Ignition off
2. Disconnect 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 the communication on the MOST network is functioning by reading off the status of the MOST locked parameter for at least 30 seconds. The parameter indicates whether the MOST network is closed and communication possible Click the VCT2000 symbol to read off the status of the MOST network.
7. If the parameter displays that the MOST network is not correctly connected, check the receiving control module in the same way as above.
The communication on the MOST network is working if the menu text is displayed. If this is the case, the fault cause is in the audio module (AUD). Continue the fault-tracing by checking the component.
The communication on the MOST network is not working if the menu text is not displayed. The fault cause is then in the MOST cable for the next control module. Continue the fault-tracing by checking the fiber optic cable.

Checking cable
- Check the MOST connection. Check for dirt, loose connections and damage
- Replace the MOST cable if no fault is found in the MOST terminal.

Checking the component
- Check the power supply and the ground terminal for the audio module (AUD)
- Check the MOST connection. Check for dirt, loose connections and damage
- Replace the audio module (AUD) if no fault is found.
Remedy as necessary.

Other information:
- Audio module (AUD), replacing Audio Module (AUD), Replacing
- Checking the voltage / ground terminal Checking Voltage / Ground Connection
- Signal specification Signal Description, Audio Module (AUD)
- Fiber optic cable harness, repairing Fiber Optic Cable Harness, Repairing
- Optical wiring harness check Wires
- Location of components Component Location, Infotainment









Continue - Verification

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Checking cable and component





Checking the fault cause
Check the fault cause 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 the communication on the MOST network is functioning by reading off the status of the MOST locked parameter for at least 30 seconds. The parameter indicates whether the MOST network is closed and communication possible Click the VCT2000 symbol to read off the status of the MOST network.
7. If the parameter displays that the MOST network is not correctly connected, check the receiving control module in the same way as above.
The communication on the MOST network is working if the menu text is displayed. If this is the case, the fault cause is in the integrated audio module (IAM). Continue the fault-tracing by checking the component.
The communication on the MOST network is not working if the menu text is not displayed. The fault cause is then in the MOST cable for the next control module. Continue the fault-tracing by checking the fiber optic cable.

Checking cable
- Check the MOST connection. Check for dirt, loose connections and damage
- Replace the MOST cable if no fault is found in the MOST terminal.

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

Other information:
- Checking the supply voltage/ground terminal Checking Supply Voltage/Ground Terminal, Integrated Audio Module (IAM)
- Signal specification Signal Description, Integrated Audio Module (IAM)
- Fiber optic cable harness, repairing Fiber Optic Cable Harness, Repairing
- Optical wiring harness check Wires
- Location of components Component Location, Infotainment









Continue - Verification

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Checking cable and component





Checking the fault cause
Check the fault cause as follows:
1. Ignition off
2. Disconnect 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 the communication on the MOST network is functioning by reading off the status of the MOST locked parameter for at least 30 seconds. The parameter indicates whether the MOST network is closed and communication possible Click the VCT2000 symbol to read off the status of the MOST network.
7. If the parameter displays that the MOST network is not correctly connected, check the receiving control module in the same way as above.
The communication on the MOST network is working if the menu text is displayed. If this is the case, the fault cause is in the phone module (PHM). Continue the fault-tracing by checking the component.
The communication on the MOST network is not working if the menu text is not displayed. The fault cause is then in the MOST cable for the next control module. Continue the fault-tracing by checking the fiber optic cable.

Checking cable
- Check the MOST connection. Check for dirt, loose connections and damage
- Replace the MOST cable if no fault is found in the MOST terminal.

Checking the component
- Check the power supply and the ground terminal for the phone module (PHM)
- Check the MOST connection. Check for dirt, loose connections and damage
- Replace the phone module (PHM) if no fault is found.
Remedy as necessary.

Other information:
- Phone module (PHM), replacing Phone Module (PHM), Replacing
- Checking voltage / ground connection Checking Voltage / Ground Connection
- Signal specification Signal Specification
- Fiber optic cable harness, repairing Fiber Optic Cable Harness, Repairing
- Optical wiring harness check Wires
- Location of components Component Location, Infotainment









Continue - Verification

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Checking cable and component





Checking the fault cause
Check the fault cause as follows:
1. Ignition off
2. Unplug the MOST connector from the global positioning system module (GPS).
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 the communication on the MOST network is functioning by reading off the status of the MOST locked parameter for at least 30 seconds. The parameter indicates whether the MOST network is closed and communication possible Click the VCT2000 symbol to read off the status of the MOST network.
7. If the parameter displays that the MOST network is not correctly connected, check the receiving control module in the same way as above.
The communication on the MOST network is working if the menu text is displayed. If this is the case, the fault cause is in the global positioning system module (GPS). Continue the fault-tracing by checking the component.
The communication on the MOST network is not working if the menu text is not displayed. The fault cause is then in the MOST cable for the next control module. Continue the fault-tracing by checking the fiber optic cable.

Checking cable
- Check the MOST connection. Check for dirt, loose connections and damage
- Replace the MOST cable if no fault is found in the MOST terminal.

Checking the component
- Check the global positioning system module (GPS) power supply and ground connection.
- Check the MOST connection. Check for dirt, loose connections and damage
- If no fault can be found, change the global positioning system module (GPS).
Remedy as necessary.

Other information:
- Global positioning system module (GPS) Service and Repair
- Checking the supply voltage/ground terminal Component Tests and General Diagnostics
- Signal specification Pinout Values and Diagnostic Parameters
- Fiber optic cable harness, repairing Fiber Optic Cable Harness, Repairing
- Optical wiring harness check Wires
- Location of components Component Location, Infotainment









Continue - Verification

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