VOLVO
AUM-41FF - Amplifier, sub-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 sub antenna is missing, or that the installation is incorrect. The fault is intermittent. The usual causes are a break in the supply from the head unit, the sub antenna not being fitted, or a defective sub antenna amplifier, and radio reception becomes poor.
Possible causes
- Break in the supply feeding the sub antenna from the head unit
- Sub antenna not fitted
- Defective sub antenna amplifier
What you can do
- 1Check the contact resistance, oxidation and wiring to the sub antenna
- 2Have a workshop clean and secure the connectors at the audio unit and at the sub antenna amplifier
- 3Have a workshop replace the sub antenna if needed
- 4Clear the code only once the connectors and antenna have been checked, and check that it does not return
Symptoms you may notice1
- Poor radio reception
General guidance for car owners. Diagnosis on the car can point to a different cause.