Diagnostic trouble code (DTC) information

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).