Part 2

Checking Audio module (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 fault cause
Check the fault cause as follows:
1. Ignition off.
2. Disconnect the MOST connector from the relevant control module.
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-net works by reading out the status for the parameter MOST locked for at least 30 seconds. The parameter indicates whether the MOST network is closed and communication possible.
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. Then the malfunction cause is in the control module in question. 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 the 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 voltage feed and ground connection for the control module in question.
- Check the MOST connection. Check for dirt, loose connections and damage.
- Replace the control module if no fault is found.
Click on the VCT2000 symbol to read out status on MOST-net.
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 Description, Audio Module (AUD)
- Diagnostic Instructions - Fibre Optic Cable Diagnostic Instructions - Fibre Optic Cable
- Location of components Locations









Continue - Verification

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Checking 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 fault cause
Check the fault cause as follows:
1. Ignition off.
2. Disconnect the MOST connector from the relevant control module.
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-net works by reading out the status for the parameter MOST locked for at least 30 seconds. The parameter indicates whether the MOST network is closed and communication possible.
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. Then the malfunction cause is in the control module in question. 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 the 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 voltage feed and ground connection for the control module in question.
- Check the MOST connection. Check for dirt, loose connections and damage.
- Replace the control module if no fault is found.
Click on the VCT2000 symbol to read out status on MOST-net.
Remedy as necessary.

Other information
- General audio player module General Audio Player Module
- Checking the supply voltage/ground terminal Checking Supply Voltage/Ground Terminal, Integrated Audio Module (IAM)
- Signal description, Integrated Audio Module (IAM) Signal Description, Integrated Audio Module (IAM)
- Diagnostic Instructions - Fibre Optic Cable Diagnostic Instructions - Fibre Optic Cable
- Location of components Locations









Continue - Verification

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Checking Accessory USB unit (AUU)

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 fault cause
Check the fault cause as follows:
1. Ignition off.
2. Disconnect the MOST connector from the relevant control module.
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-net works by reading out the status for the parameter MOST locked for at least 30 seconds. The parameter indicates whether the MOST network is closed and communication possible.
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. Then the malfunction cause is in the control module in question. 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 the 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 voltage feed and ground connection for the control module in question.
- Check the MOST connection. Check for dirt, loose connections and damage.
- Replace the control module if no fault is found.
Click on the VCT2000 symbol to read out status on MOST-net.
Remedy as necessary.

Other information
- Universal Serial Bus (USB) Module Universal Serial Bus (USB) Module
- Checking the supply voltage/ground terminal Checking Voltage/Ground Terminal, Accessory USB Unit (AUU)
- Signal specification Signal Specification, Accessory USB Unit (AUU)
- Diagnostic Instructions - Fibre Optic Cable Diagnostic Instructions - Fibre Optic Cable
- Location of components Locations









Continue - Verification

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Checking phone module (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 fault cause
Check the fault cause as follows:
1. Ignition off.
2. Disconnect the MOST connector from the relevant control module.
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-net works by reading out the status for the parameter MOST locked for at least 30 seconds. The parameter indicates whether the MOST network is closed and communication possible.
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. Then the malfunction cause is in the control module in question. 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 the 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 voltage feed and ground connection for the control module in question.
- Check the MOST connection. Check for dirt, loose connections and damage.
- Replace the control module if no fault is found.
Click on the VCT2000 symbol to read out status on MOST-net.
Remedy as necessary.

Other information
- Diagnostic Instructions - Fibre Optic Cable Diagnostic Instructions - Fibre Optic Cable
- Location of components Locations
- Phone Module (PHM) Phone Module (PHM) Phone Module (PHM) Phone Module (PHM)
The following links apply to Phone Module (PHM), later version.
- Signal specification Signal Description, Phone Module (PHM)
- Checking the supply voltage/ground terminal Checking Supply Voltage/Ground Terminal . Phone Module (PHM)
- Diagnostic Instructions - Fibre Optic Cable Diagnostic Instructions - Fibre Optic Cable
- Location of components Locations
- Phone Module (PHM) Phone Module (PHM) Phone Module (PHM) Phone Module (PHM)













Continue - Verification

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Checking Subwoofer module (SUB)

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 fault cause
Check the fault cause as follows:
1. Ignition off.
2. Disconnect the MOST connector from the relevant control module.
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-net works by reading out the status for the parameter MOST locked for at least 30 seconds. The parameter indicates whether the MOST network is closed and communication possible.
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. Then the malfunction cause is in the control module in question. 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 the 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 voltage feed and ground connection for the control module in question.
- Check the MOST connection. Check for dirt, loose connections and damage.
- Replace the control module if no fault is found.
Click on the VCT2000 symbol to read out status on MOST-net.
Remedy as necessary.

Other information
- Subwoofer module (SUB) Subwoofer Module (SUB), Replacing
- Checking the supply voltage/ground terminal Checking Supply Voltage/Ground Terminal
- Signal specification Signal Specification, Subwoofer Module (SUB)
- Diagnostic Instructions - Fibre Optic Cable Diagnostic Instructions - Fibre Optic Cable









Continue - Verification

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Checking the 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 fault cause
Check the fault cause as follows:
1. Ignition off.
2. Disconnect the MOST connector from the relevant control module.
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-net works by reading out the status for the parameter MOST locked for at least 30 seconds. The parameter indicates whether the MOST network is closed and communication possible.
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. Then the malfunction cause is in the control module in question. 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 the 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 voltage feed and ground connection for the control module in question.
- Check the MOST connection. Check for dirt, loose connections and damage.
- Replace the control module if no fault is found.
Click on the VCT2000 symbol to read out status on MOST-net.
Remedy as necessary.

Other information
- Checking the supply voltage/ground terminal Checking Voltage/Ground Terminal, Remote Digital Audio Receiver (RDAR)
- Signal specification Signal Specification, Remote Digital Audio Receiver (RDAR)
- Diagnostic Instructions - Fibre Optic Cable Diagnostic Instructions - Fibre Optic Cable
- Location of components Component Location, Remote Digital Audio Receiver (RDAR)
- Satellite radio control module Satellite Radio Control Module









Continue - Verification

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Checking the Digital Audio Broadcast Module (DABM)

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 fault cause
Check the fault cause as follows:
1. Ignition off.
2. Disconnect the MOST connector from the relevant control module.
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-net works by reading out the status for the parameter MOST locked for at least 30 seconds. The parameter indicates whether the MOST network is closed and communication possible.
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. Then the malfunction cause is in the control module in question. 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 the 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 voltage feed and ground connection for the control module in question.
- Check the MOST connection. Check for dirt, loose connections and damage.
- Replace the control module if no fault is found.
Click on the VCT2000 symbol to read out status on MOST-net.
Remedy as necessary.

Other information
- Diagnostic Instructions - Fibre Optic Cable Diagnostic Instructions - Fibre Optic Cable









Continue - Verification

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