VOLVO
AEM-4F63 - Back-up (reversing) warning system, buzzer. Signal too high. Permanent fault
System
Accessory Electronic Module (AEM)
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 AEM has registered a signal that is too high, or an open circuit, on the buzzer wire of the reversing warning system just after the warning was activated. The fault is permanent, and the buzzer does not work. The cause is usually a short to supply voltage, a break in the wire or a faulty buzzer.
Possible causes
- Buzzer wire from the reversing warning system shorted to supply voltage
- Break in the buzzer wire from the reversing warning system
- Faulty reversing warning buzzer
What you can do
- 1Follow the buzzer wire and look for breaks, chafing or damage
- 2Check the buzzer connector for oxidation and loose connections
- 3Check whether the buzzer sounds when reverse gear is selected
- 4If the fault remains, have the buzzer or the wire replaced after the workshop has checked it
Symptoms you may notice1
- Reversing warning system does not work
What the fault can affect1
- The reversing warning system is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.