Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition
Diagnostic trouble code (DTC) AUM-4001 is stored if the ignition is on, main antenna supplied with power and the head unit/audio module detects low voltage on the main antenna output voltage.

Possible source
- The power supply from head unit to the main antenna is short-circuited to ground.
- Defective antenna amplifier

Fault symptom[s]
- Poor radio reception (AM).