Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ICM-U1A2400

Condition
The infotainment control module (ICM) checks that the status of the MOST network is MOST-LOCK.
MOST-LOCK means that the network is closed and that communication is possible.
The diagnostic trouble code (DTC) is stored if the control module detects that:
- The MOST network is not connected.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Control module on for longer than 5 seconds.

Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.





Substitute value
- None.

Possible source
- Dirty or damaged terminal for the MOST cable.
- Open-circuit in the MOST cable.
- MOST transceiver is damaged in one of the control modules in the MOST network.
- No power supply to a control module in the MOST network.
- Damaged fuse.
- Damaged control module in the MOST network.

Fault symptom[s]
- Audio system does not function
- Navigation; No Functionality
- Infotainment functions do not work
- Missing or reduced functionality in the phone
Hint: The following only applies to S80 (07-), V70 (08-) and XC70 (08-) manufactured before week 35, 2008: If the trouble symptom is Audio other/Audio unit (complete) not working, Audio other/Display on audio unit not working, Audio other/Other audio problems or Radio/Not working, check and troubleshoot according to: TIE TJ 18609.