Body, generic

B0531 Passenger Door Lock Actuator Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Passenger door lock motor burnt out or seized
Lock motor wire chafed to ground in the door
Water ingress at the latch connector
Door or body control module output faulty

Symptoms

  • Passenger door stays locked or unlocked while others follow
  • Whole central locking inoperative if a shared line is grounded
  • Audible click without latch movement

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–400
Time1–3 h

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

Parts involved

passenger door lock actuatorbody control module

Related codes

B0530B0532B0533B0270

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