VOLVO
CEM-5B02 - RH heating element. Signal faulty. Intermittent fault
System
Central Electronic Module (CEM)
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 right seat heating module has reported to the central electronic module (CEM) that the heater pad in the seat has a fault. The fault is intermittent, meaning it comes and goes, so it may have occurred earlier without being active now. If the heater pad is internally faulty it needs replacing.
Possible causes
- Heater pad in the right seat is faulty
What you can do
- 1Clear the code and road test with the seat heater switched on to see whether the fault returns
- 2Check that the connectors in the cable to the right seat heater are secure and free from corrosion
- 3Check that the wiring under the seat is free from chafing and pinching
- 4Use a multimeter to check that the wires to the right seat heater are not broken and have no contact with ground (the body)
- 5If the heater pad is internally faulty, a workshop should replace it
Symptoms you may notice1
- Front right seat heating does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.