Body, generic

B0270 Passenger Door Lock Switch Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Lock rocker in the passenger door worn, sticking or contaminated
Switch signal wire chafed to ground or broken in the door hinge passage
Water ingress or corrosion at the door trim switch connector
Door or body control module input stage faulty

Symptoms

  • 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

Repair estimate

DifficultyEasyDIY possible
Parts and labour€30–250
Time0.4–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

door lock switchbody control moduledoor harness

Related codes

B0265B0272B0531

References: saabwisonline.com, patents.google.com, patents.google.com, hella.com.