Signal Missing

Signal missing

Checking the function of the infotainment control module (ICM)
Check that the infotainment control module (ICM) is powered and grounded by switching on the ignition. Then switch on the radio.
The infotainment control module (ICM) display must be lit.





Does the display light?

Yes - Checking communication with the infotainment control module (ICM)

No - Checking the power supply and ground for the infotainment control module (ICM)

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Checking communication with the infotainment control module (ICM)

Hint: The CAN communication with the control module is OK if the control module ID can be read off. The diagnostic trouble code (DTC) was probably stored by an intermittent fault in the wiring and could be more difficult to find.




- Try to communicate with the infotainment control module (ICM) by reading off the control module ID
- Click on the symbol for VCT2000 to begin reading off

Continue - Signal missing

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Checking the power supply and ground for the infotainment control module (ICM)




- Ignition off.
Check that the fuse for the infotainment system in the fusebox in the engine compartment is intact. Also check the subsequent circuit. Check for an open-circuit. Check for a short-circuit to ground.
Check that the fuse for the infotainment control module (ICM) in the central electronic module (CEM) is intact.
Check the cable between the infotainment control module (ICM) and ground. Check for an open-circuit. Check for a short-circuit to supply voltage.

Other information
- Connecting the breakout box Connecting the Breakout Box, Infotainment Control Module (ICM)
- Signal specification Pinout Values and Diagnostic Parameters
- Checking wiring and terminals Checking Wiring and Terminals









Was a fault detected?

Yes - Verification

No - Checking the Infotainment relay status

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Checking the Infotainment relay status

Hint: If the power supply to the infotainment control module (ICM) does not function, this can be due to the Infotainment relay in the central electronic module (CEM) not functioning.




- Ignition on.
Check the status and activation of the Infotainment relay. Click the VCT2000 symbol.
There is an internal fault in the central electronic module (CEM) if the relay is not activated and cannot be activated. In this case, the central electronic module (CEM) must be replaced.

Other information





Was a fault detected?

Yes - Verification

No - Signal missing

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Signal missing

No Fault Found - No Fault Found

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Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Switch on the ignition for at least 10 seconds.
With the ignition key in position I or II, check that the infotainment control module (ICM) is powered and grounded by checking that the display for the infotainment control module (ICM) lights. If the display illumination lights up, the infotainment control module (ICM) is powered and grounded.

Does the button illumination light?

Yes - FAULT FOUND

No - Fault-tracing information

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Fault-tracing information

Attempt New Test - Checking the function of the infotainment control module (ICM)

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