Body, generic

B0152 Driver Buckle Switch Circuit Malfunction

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0152 appears in no J2012 code list and in no public carmaker document. In J2012 the driver's buckle sensor is B0050, so the title duplicates that code. The switch tells the vehicle whether the tongue is latched. TRW's patent US5898366A places a Hall device, a magnet and an armature in the buckle, and the latch movement changes the flux and thus the output; US5966784A uses a flux reversal for the same purpose and adds that the signal can steer airbag deployment. FMVSS 208 S7.3 requires a driver belt warning: a lamp and a 4 to 8 second chime, or a lamp lasting at least 60 seconds. A circuit fault can leave the reminder on with the belt fastened, or silent without it.

Likely causes

Buckle plug under the driver seat loose or corroded
Buckle lead pinched or broken by seat movement
Hall sensor or contact in the buckle defective, buckle must be replaced

Symptoms

  • Belt reminder for the driver stays on or does not come on
  • Airbag warning lamp on in vehicles that read the buckle in the airbag module
  • Safety note: the buckle plug sits under the seat near airbag and pretensioner plugs; unplug only with the battery off and the wait time observed

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€60–400
Time0.5–2 h

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

Parts involved

seat belt buckle switchsrs seat wiringsrs control module

Related codes

B0050B0154B00D0

References: patents.google.com, patents.google.com, law.cornell.edu.