VOLVO
UEM-0005 - Sun roof. Communication fault
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 upper electronic module (UEM) sends requests to the sun roof and gets no reply. The code is set when the sun roof does not answer repeated requests, which is read as a communication fault. The electric sun roof can then not be used.
Possible causes
- Break in the serial cable between the UEM, the siren and the sun roof
- The serial cable is short-circuited to ground
- The serial cable is short-circuited to voltage
- Defective sun roof
- Damaged sun roof control module
What you can do
- 1Switch the ignition on and try to operate the sun roof.
- 2Read off the code, clear it and test-drive the sun roof to see whether it returns.
- 3Check that the fuses in the fuse box in the passenger compartment are intact.
- 4Look for loose connectors and corrosion at the sun roof control module and the upper electronic module.
- 5Look for damage on the cable harness between the upper electronic module and the sun roof.
- 6If the fault remains, have a workshop check the wiring and the sun roof.
Symptoms you may notice1
- The electric sun roof does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.