B0094 DTC – Seat Belt Pretensioner Deployment Loop Circuit Malfunction

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B0094 DTC – Seat Belt Pretensioner Deployment Loop Circuit Malfunction

The Diagnostic Trouble Code (DTC) B0094 indicates that the Supplemental Restraint System (SRS) has detected a malfunction in the seat belt pretensioner deployment loop circuit. The pretensioner deployment loop is monitored continuously by the SRS control module to ensure the pretensioner can activate during a collision. The exact seat location and circuit configuration vary by vehicle manufacturer.

Symptoms

  • Airbag warning light illuminated.
  • Service Airbag message displayed.
  • Seat belt pretensioner disabled.
  • B0094 stored in the SRS control module.

Possible Causes

  • Faulty seat belt pretensioner.
  • Open deployment loop circuit.
  • Short to ground or battery voltage.
  • Loose or corroded connector under the seat.
  • Damaged wiring harness.
  • Faulty SRS (SDM) control module.

How to Diagnose B0094

  1. Read all stored SRS Diagnostic Trouble Codes.
  2. Inspect the pretensioner connector beneath the seat.
  3. Check the wiring harness for cuts, corrosion, or pin damage.
  4. Verify deployment loop continuity following the service manual.
  5. Inspect for previous collision repairs or damaged connectors.
  6. Replace the pretensioner if wiring and connectors test correctly.
  7. Clear the DTC and verify that it does not return.

Typical Circuit Diagram

      SRS Control Module
             │
             │
             ▼
 Pretensioner Deployment Loop
             │
             │
             ▼
 Seat Belt Pretensioner
             │
             ▼
 Occupant Protection

Repair Cost

  • Wiring repair: $30–120
  • Seat belt pretensioner replacement: $150–500
  • SRS control module replacement: $300–900

Related DTCs

  • B0092
  • B0093
  • B0094
  • B0095

FAQ

Is it safe to drive with DTC B0094?

The vehicle may remain drivable, but the seat belt pretensioner may fail to operate during a collision, reducing occupant protection.

Can a loose connector trigger B0094?

Yes. A loose, damaged, or corroded connector beneath the seat is a common cause of this DTC.

Should the pretensioner be tested with a multimeter?

No. Direct resistance measurements on airbag or pretensioner devices are generally not recommended. Always follow the manufacturer's SRS diagnostic procedures.

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