Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information UEM-003A

Condition
The upper electronic module (UEM) supplies power to a number of functions in the car via Extended X-supply (EXT_X). These functions include the sun roof logic, mirror lamps in the sun visor, rain sensor, buttons for the headlining lighting and certain button lighting.
Diagnostic trouble code (DTC) UEM-003A is stored if the upper electronic module (UEM) registers too low a level for power supply Extended X-supply (EXT_X).
Diagnostic trouble code (DTC) UEM-003A can be diagnosed in ignition positions I or II.

Substitute value
- Sun roof, mirror lamps in the sun visor, buttons for the headlining lighting and certain button lighting are switched off.

Possible source
- The power supply to the sun roof, mirror lamps in the sun visor, rain sensor, buttons for the headlining lighting and certain button lighting functions is short-circuited to ground.

Fault symptom[s]
- The power sun roof does not operate
- The interior lighting does not operate
- No rain sensor function.