Code B0052 indicates a fault in the passenger seat belt buckle sensor circuit. This means the Supplemental Restraint System (SRS) cannot accurately detect whether the passenger seat belt is fastened or unfastened.
The internal switch within the seat belt buckle has worn out or failed electrically.
Wires leading from the buckle to the SRS module are frayed, pinched, or broken, often due to seat movement.
Debris, coins, or liquids lodged in the buckle mechanism prevent the sensor from triggering.
The electrical connector under the seat is loose or has developed corrosion, interrupting the signal.
The airbag control module has an internal fault and is incorrectly reporting a circuit error.
Yes, in many vehicles, a fault in the seat belt sensor may cause the passenger airbag to be disabled or to deploy with an incorrect force.
No. The vast majority of B0052 cases are caused by the buckle switch or wiring; the module is rarely the source of the problem.
If the sensor is not triggering because of a foreign object or sticky residue in the latch, cleaning the buckle may resolve the issue.