VOLVO
UEM-0091 - Rear view mirror, display. Signal too high
System
Upper Electronic Module (UEM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
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 UEM reads an excessive level on the supply feeding the LEDs of the interior mirror display. The cause is that the wire has contact with voltage. The SRS warning lamp may then light.
Possible causes
- The supply line feeding the mirror display LEDs touches voltage
What you can do
- 1Have a workshop check that the supply wire to the mirror display has no contact with voltage.
- 2Have a workshop check the wire to the interior rear view mirror for damage.
- 3Read off the code, clear it and check whether it returns.
- 4If the SRS warning lamp is lit, have a workshop check the airbag system.
- 5If the fault remains, have a workshop read out the programmed data if possible and replace the upper electronic module.
Symptoms you may notice1
- The SRS warning lamp is lit
General guidance for car owners. Diagnosis on the car can point to a different cause.