Signal Too Low

Signal too low

Checking components and wiring
Check the connector on the infotainment control module (ICM). Check for contact resistance and oxidation and damage.
Check the fuse for the infotainment control module (ICM).
Check the relay for the infotainment system on the central electronic module (CEM).

Hint: A diagnostic trouble code (DTC) is stored in the central electronic module (CEM) if there is a fault in the deployment of the fuse for the infotainment system.

Check the power supply cable between the fuse for the infotainment system and relay terminal #3 and between relay terminal #1 and infotainment control module (ICM) terminal #1 (#A1). Check for an open-circuit. Check for a short-circuit to ground.
Check the ground lead between infotainment control module (ICM) terminal #10 (#A10) and the ground terminal. Check for an open-circuit. Check for a short-circuit to supply voltage. Also check the ground terminal for contact resistance and oxidation.
Remedy as necessary.

Other information:
- To access or replace the infotainment control module (ICM), see Infotainment control module (ICM), replacing Infotainment Control Module (ICM), Replacing
- To connect the breakout box, see Connecting the breakout box Pinout Values and Diagnostic Parameters
- For information about signals, see Signal specification Signal Specification, Infotainment Control Module (ICM)
- Checking wiring and terminals Checking Wiring and Terminals
- For further information about the fuses and relays, see the Wiring Diagram.









Continue - Verification

-------------------------------------------------

Verification




Verification

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








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Read off the power supply to the infotainment control module (ICM) by clicking on the VCT2000 symbol.
Check that the voltage is approximately battery voltage.





Is the voltage OK?

Yes - Troubleshooting procedure complete

No - Fault-tracing information

-------------------------------------------------

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

------------------------

Attempt New Test - Checking components and wiring

-------------------------------------------------