VOLVO
UEM-0035 - Front left reading lamp. Signal missing
System
Upper Electronic Module (UEM)
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 code concerns the control signal to the front left reading lamp and is set when that signal is faulty, either while the front lamp is lit and the rear lamp is off, or the other way round. The code is also set if the connection to the roof lamp control unit is not making proper contact. UEM-0037 and UEM-0039 are often stored together with this code.
Possible causes
- Faulty bulb
- Open circuit in the signal wire for the front left reading lamp
- Short to voltage on the signal wire for the front left reading lamp
- The connection to the roof lamp control unit is not making proper contact
What you can do
- 1Check that the bulb is intact.
- 2Check the connectors at the upper electronic module and the roof lamp for contact resistance, oxidation and loose connections.
- 3Remedy the connectors where needed, then check that they are firmly seated.
- 4With a multimeter you can check that the wire between the upper electronic module and the roof lamp is not broken and has no contact with voltage.
- 5If the fault remains, have a workshop check the roof lamp and the wire.
Symptoms you may notice1
- Passenger compartment lighting does not work
What the fault can affect1
- The front left lamp goes out
General guidance for car owners. Diagnosis on the car can point to a different cause.