VOLVO
AEM-7A11 - Carphone mute signal. Signal too high or Signal missing. Permanent fault
System
Accessory Electronic Module (AEM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
What does this fault code mean?
The AEM has registered a signal that is too high on the telemute wire to the radio, or a missing signal, and the fault is permanent. Telemute on the radio does not work. The cause is usually a short to supply voltage in the wire or a faulty radio unit.
Possible causes
- Telemute wire to the radio shorted to supply voltage
- Faulty radio
What you can do
- 1Follow the telemute wire to the radio and look for chafing or damage
- 2Check the connectors at the radio for oxidation and loose connections
- 3If the fault remains, have the radio replaced by a workshop after checking the wire
Symptoms you may notice1
- Telemute on the radio does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.