What does it mean?
B1536 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Seat Belt Switch (RH) Circuit (Power Supply Side) Shorted (For Normal/Open Terminal) .
Symptoms
- Airbag warning lamp on
- Right belt reminder permanently indicates the belt is fastened
- Belt state in scan data held high whatever the buckle does
- Occasionally a blown seat fuse or a seat function that stops working
- Fault returns as soon as the code is cleared
Likely causes
- Latch contact wire chafed against a powered lead in the seat loom
- Aftermarket seat heater, cooler or accessory wiring leaking voltage into the switch line
- Terminal pushed out of the under-seat connector and contacting a live pin
- Corrosion and moisture in the connector bridging a supply pin to the switch circuit
- Loom insulation damaged where it passes the seat frame or a rail bolt
- Internal short inside the buckle between the latch contact and a powered path
How to fix it
- Verify with live data that the belt state is stuck in the fastened position
- Unplug the buckle and check the harness side for battery voltage with the key on
- Look for aftermarket seat accessories spliced into the loom and disconnect them for a retest
- Inspect the under-seat connector for water damage, corrosion and terminals touching live pins
- Trace the loom for chafed or melted insulation against powered wiring
- Repair or replace the damaged harness section with correct terminals and reroute it clear of feeds
- Replace the right buckle assembly if the short is proven inside the switch, then clear and confirm