VOLVO
UEM-0084 - Rain sensor. Faulty signal
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) checks the communication with the rain sensor at regular intervals. The code is set if either the UEM or the rain sensor registers a communication fault. The rain sensor then provides no function.
Possible causes
- Contact resistance or oxidation on the signal wire
- Interference in the communication
- Faulty rain sensor
What you can do
- 1Check the connectors at the upper electronic module and at the rain sensor for contact resistance and oxidation.
- 2Also check the wiring to the rain sensor and to any GSM antenna. Make sure there are no sources of interference nearby.
- 3Read off the code, clear it and check whether it returns.
- 4If the fault remains, have a workshop replace the rain sensor.
Symptoms you may notice1
- The rain sensor does not work
What the fault can affect2
- The windshield wipers run intermittently
- The windshield wipers may run at high speed
General guidance for car owners. Diagnosis on the car can point to a different cause.