B0270Passenger Door Lock Switch Circuit
- Generic OBD-II code · Body
- How the car detects it
- Public evidence for B0270 is lacking: it is absent from every publicly available J2012 list, and no manufacturer describes it. The title points to the lock/unlock rocker in the front passenger door. Saab, for instance, files that switch in the 9-3 (2003–2012) under its own number B3270: when the passenger door module reads a grounded switch line, the button is ignored and central locking only responds to the remaining controls. In the active-low input of US5619075A a pressed switch pulls the module input to ground. A circuit fault therefore means the module sees a button held permanently, never pressed or giving an implausible level. Remote key and driver switch normally keep working; the driver-side switch has its own code, B0265.
- What you may notice
- Passenger door lock button has no effect on central locking
- Doors lock or unlock by themselves when the switch line is shorted
- Remote key and driver switch still lock the car normally
- Likely causes
- LikelyLock rocker in the passenger door worn, sticking or contaminated
- PossibleSwitch signal wire chafed to ground or broken in the door hinge passage
- PossibleWater ingress or corrosion at the door trim switch connector
- RareDoor or body control module input stage faulty
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.