AUM-40FF

Condition
Diagnostic trouble code (DTC) AUM-40FF is stored if the head unit/audio control module registers that there is an open-circuit in the power supply to the main antenna or a faulty installation.

Possible source
- Open-circuit in the power supply from the head unit/audio control module to the main antenna.
- Main antenna not installed.
- Defective antenna amplifier.

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