B0531Passenger Door Lock Actuator Circuit
- Generic OBD-II code · Body
- How the car detects it
- B0531 is neither in the accessible J2012 lists nor in any public manufacturer document, so the code itself cannot be verified. Its title covers the lock motor in the front passenger door. The Saab 9-3 checks that motor in the passenger door module and stores B3135 02 when the line is grounded during a lock or unlock request. In GM's 2011 Saab 9-5, by contrast, the body control module drives grouped lock and unlock lines (B3125, B3130, B3135 02) at 9–18 V; a grounded line disables the power locks; once repaired, the stored entry ages out after 50 starts. Mitsuba's US7218120B2 describes how a driver stage can be checked with a small test current for shorts to supply or ground before the motor is powered. Driver door: B0530.
- What you may notice
- Passenger door stays locked or unlocked while others follow
- Whole central locking inoperative if a shared line is grounded
- Audible click without latch movement
- Likely causes
- LikelyPassenger door lock motor burnt out or seized
- PossibleLock motor wire chafed to ground in the door
- PossibleWater ingress at the latch connector
- RareDoor or body control module output faulty
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.