B0052critical severityBody
Driver Seat Belt Pretensioner Circuit Open
on 2005 Toyota 4Runner 4.0L V6 · RWD
What this code means
An open circuit detected in the driver seat belt pretensioner deployment loop.
Symptoms
- Airbag/seatbelt warning light on
- SRS fault stored
- Pretensioner will not activate in crash
- No driving symptoms
Common causes
- Disconnected pretensioner connector
- Broken wire in B-pillar
- Faulty pretensioner squib
- Seat belt assembly replaced without proper reconnection
Diagnostic steps
- Scan SRS codes
- Inspect pretensioner connector at B-pillar base
- Check wiring continuity
- Measure deployment loop resistance
Repair notes
Reconnect pretensioner or repair wiring. Replace seat belt assembly if pretensioner is faulty.
Other Body codes on this vehicle
B0001
Driver Frontal Stage 1 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0005
Driver Knee Airbag Deployment Circuit
B0006
Passenger Knee Airbag Deployment Circuit
B0007
Rear Left Side Airbag Deployment Circuit
B0008
Rear Right Side Airbag Deployment Circuit
B0010
Driver Side Airbag Deployment
B0011
Driver Side Airbag Deployment Circuit Open