VOLVO
PSR-004A - Hall sensor backrest. Open circuit
System
Powertrain (Engine & Gearbox)
Volvo models this fault code applies to
Applies to the following models:
3 modelsC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013)
Show models by year and engine (3)
What does this fault code mean?
The right power seat control module (PSR) checks the signal from the backrest hall sensor and registers a signal that is too low. This can come from an open circuit in the cable or from the cable being shorted to ground, and backrest adjustment is reduced as a result.
Possible causes
- Open circuit in the cable to the backrest hall sensor
- Short to ground in the cable
What you can do
- 1Check that the seat fuses are intact; their locations are in the owner's manual or on the fuse chart
- 2With the battery negative lead disconnected, use a multimeter to check that the cable to the hall sensor has no open circuit
- 3Use a multimeter to check that the cable has no contact with ground (the bodywork)
- 4Check the connectors in the cable for loose or oxidised joints
- 5If the wiring is intact but the fault remains, have a workshop replace the hall sensor and, if the fault still remains, the control module
Symptoms you may notice1
- Reduced seat function
General guidance for car owners. Diagnosis on the car can point to a different cause.