Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ICM-U1A1587

Condition
The infotainment control module (ICM) can detect an open-circuit in the MOST network after the ring break diagnostic has been run.
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:
- Ignition switch position I and II.

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 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