B0080 DTC – Fourth Row Right Seat Belt Pretensioner Circuit Fault

DTC B0080 indicates that the Supplemental Restraint System (SRS) has detected a malfunction in the fourth-row right seat belt pretensioner circuit. The pretensioner rapidly tightens the seat belt during a collision to improve occupant safety.

Symptoms

• Airbag (SRS) warning light ON.
• B0080 stored in the SRS module.
• Seat belt pretensioner disabled.
• "Service Airbag" message may appear.

Possible Causes

• Faulty fourth-row right seat belt pretensioner.
• Loose, damaged, or disconnected connector.
• Open circuit in the wiring harness.
• Short to ground or battery voltage.
• Corroded connector terminals.
• Internal SRS control module fault (rare).

Typical Wiring Diagram

┌────────────────────────┐
│       SRS MODULE       │
└──────────┬─────────────┘
           │
           │ Deployment Signal
           │
┌──────────▼─────────────┐
│       CONNECTOR        │
└──────────┬─────────────┘
           │
           │ Wiring Harness
           │
┌──────────▼─────────────┐
│ Fourth Row Right       │
│ Seat Belt              │
│ Pretensioner           │
└────────────────────────┘

Diagnostic Procedure

1. Scan the SRS module and record all stored DTCs.
2. Inspect the connector for loose pins, corrosion, or physical damage.
3. Inspect the wiring harness for open circuits, shorts, or damaged insulation.
4. Check wiring continuity using the factory wiring diagram.
5. Repair the fault, clear the DTC, and verify that B0080 does not return.

Live Data Inspection

• Pretensioner Status: Normal
• Deployment Circuit: Active
• Open Circuit: No
• Short to Ground: No
• Short to Battery: No
• Circuit Resistance: Within manufacturer specifications

Safety Notice

Disconnect the negative battery terminal and wait at least 10 minutes before servicing any SRS component. Never apply external voltage directly to a seat belt pretensioner or airbag circuit.

Related DTCs

• B0078
• B0079
• B0081
• B0082