Body, generic

B0272 Power Door Lock Switch Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Neither the reachable J2012 lists nor any carmaker's documents mention B0272, which leaves the code unproven. Its title covers the interior central-locking button in general, without naming a door. Saab logs a held button in the 9-3 driver door module as B3270 61: if the input stays low, the module waits until the key is released and pressed again before acting. In US6365986B1 such a manual switch inside the door is one of two inputs, next to the key-cylinder contact, from which the control unit drives the lock motors. US6157090A codes each switch position with its own resistor, so the body module reads the position as a current level. The door-specific switch codes are B0265 and B0270; actuator faults are B0530 ff.

Likely causes

Central-locking button mechanically stuck or contacts worn
Switch wire shorted to ground or open between switch and module
Spilled liquid or condensation in the switch panel
Door or body control module misreads the switch input

Symptoms

  • Interior lock button does not lock or unlock the doors
  • Locks cycle unexpectedly or only react to the remote key

Repair estimate

DifficultyEasyDIY possible
Parts and labour€30–200
Time0.5–1.5 h

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

Parts involved

door lock switchdoor wiring harnessbody control module

Related codes

B0265B0270B0530

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