VOLVO
AUM-40FF - Amplifier, main antenna. Signal missing. 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 registered that the power supply to the main antenna is missing, or that the antenna is incorrectly installed. The fault is intermittent. The usual causes are a break in the supply from the head unit, the main antenna not being fitted, or a defective antenna amplifier, and AM reception becomes poor.
Possible causes
- Break in the supply feeding the main antenna from the head unit
- Main antenna not fitted
- Defective antenna amplifier
What you can do
- 1Check the contact resistance, oxidation and wiring to the main antenna
- 2Have a workshop clean and secure the connectors at the antenna amplifier and the audio unit
- 3Make sure the main antenna is fitted correctly
- 4Replace the antenna amplifier if the fault remains after these checks
Symptoms you may notice1
- Poor AM radio reception
General guidance for car owners. Diagnosis on the car can point to a different cause.