Part 2
Faulty signal
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 Fiber Optic Cable Harness, Repairing
- Diagnostic Instructions - Fiber Optic Cable Diagnostic Instructions - Fiber 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 fiber-optic 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 Fiber Optic Cable Harness, Repairing
- Diagnostic Instructions - Fiber Optic Cable Diagnostic Instructions - Fiber Optic Cable
- Satellite radio control module Satellite Radio Control Module
Continue - Verification
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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 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 fiber-optic 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 Fiber Optic Cable Harness, Repairing
- Diagnostic Instructions - Fiber Optic Cable Diagnostic Instructions - Fiber 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 fiber-optic 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 General Audio Player Module
- 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 Fiber Optic Cable Harness, Repairing
- Diagnostic Instructions - Fiber Optic Cable Diagnostic Instructions - Fiber Optic Cable
- Location of components Component Location, Infotainment
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Activate the infotainment system and select the radio.
Check whether there is sound from the radio in the loudspeakers.
Is the sound of the radio coming through the loudspeakers?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - 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 - Checking the wiring and component
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Checking lead and 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. Unplug the MOST-connector from Accessory USB unit (AUU).
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. Click on the VCT2000 symbol to read out status on MOST-net.
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 in the Accessory USB unit (AUU). 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 the audio module (AUD) power supply and ground connection for the Accessory USB unit (AUU).
- Check the MOST connection. Check for dirt, loose connections and damage.
- If no fault is found, replace the Accessory USB unit (AUU).
Remedy as necessary.
Other information
- Downloading software and replacing control module Accessory USB Unit (AUU)
- Checking the supply voltage/ground terminal Checking Voltage/Ground Terminal, Accessory USB Unit (AUU)
- Signal description Signal Description Accessory USB Unit (AUU)
- Fiber optic cable harness, repairing Fiber Optic Cable Harness, Repairing
- Location of components Component Location, Infotainment
Continue - Verification
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Checking cables and components, Bluetooth phone module (BPM)
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 connector for the MOST network from the Bluetooth phone module (BPM).
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. 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. If this is the case, the fault cause is in the Bluetooth phone module (BPM). 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 the Bluetooth phone module (BPM) power supply and ground connection.
- Check the MOST connection. Check for dirt, loose connections and damage.
- If no fault can be found, replace Bluetooth phone module (BPM).
Remedy as necessary.
Other information:
- Location of components Component Location, Infotainment
- Checking the supply voltage/ground terminal Checking Voltage/Ground Terminal, Bluetooth Phone Module (BPM)
- Signal specification Signal Specification, Bluetooth Phone Module (BPM)
- Fiber optic cable harness, repairing Fiber Optic Cable Harness, Repairing
- Diagnostic Instructions - Fiber Optic Cable Diagnostic Instructions - Fiber Optic Cable
- Bluetooth control module Bluetooth Control Module
Continue - Verification
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