VOLVO
AUM-4002 - Amplifier, main antenna. Signal too high. Intermittent fault
System
Audio Unit Module (AUM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007)
Show models by year and engine (4)
What does this fault code mean?
The audio unit (AUM) has detected a high voltage on the output of the main antenna even though the ignition is off and the antenna is not powered. The fault is intermittent. The usual cause is a defective antenna amplifier, and no effect on driving or sound is normally noticed.
Possible causes
- Defective antenna amplifier
What you can do
- 1Check the contact resistance, oxidation and wiring to the antenna amplifier
- 2Have a workshop clean and secure the connectors at the antenna amplifier and the audio unit
- 3Clear the code and check whether it returns
- 4Replace the antenna amplifier if the fault returns
Symptoms you may notice1
- No noticeable symptoms
General guidance for car owners. Diagnosis on the car can point to a different cause.