What it means
This code identifies a fault associated with the passenger seat belt sensor. The restraint control module sets it when it detects a problem with this sensor; the specific fault is identified by accompanying subfault information.
At a glance
- Usually lights the airbag (SRS) or body-system warning light
How it works
The passenger seat-belt sensor or buckle switch reports passenger belt status to the restraint control module. The module monitors that input and its circuit for a fault; B0052's accompanying subfault information identifies the particular failure detected.
Common causes
Most likely first.
- Faulty passenger seat belt buckle switch or sensor
- Damaged wiring or loose connector at the buckle
- Connector corrosion or poor electrical contact
- Fault in the restraint control module
Symptoms
- Airbag or seat belt warning light on
- Seat belt status may be misreported
How to diagnose it
- Use a restraint-capable scan tool to retrieve the B0052 subfault and freeze-frame data, and confirm which passenger seating position the vehicle identifies.
- Check that the passenger belt latches and releases correctly, then observe whether the seat-belt warning responds to its status.
- Inspect the passenger buckle connector and wiring for looseness, corrosion, damaged pins, or chafing, taking care around restraint-system wiring.
- Compare passenger belt-status data on the scan tool as the buckle is latched and unlatched.
- Test the passenger buckle sensor circuit using the manufacturer's procedure; assess the restraint control module only after the sensor and wiring are checked.
Common fixes
- Reconnect or repair damaged wiring at the passenger buckle.
- Repair corroded or loose connector terminals.
- Replace the faulty passenger buckle switch or seat-belt sensor assembly.
- Repair or replace the restraint control module only if its circuits and connections test correctly.
Can I keep driving?
The vehicle may be driveable, but the passenger belt status may be wrong and the restraint system may not respond as intended in a crash. Ensure the passenger belt latches securely and have the warning diagnosed promptly.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.