Airbags

B0075 — Second Row Right Seatbelt Pretensioner Deployment Control Circuit

Severity: medium Safe to drive

What B0075 means

The SRS control module detected a fault in the deployment control circuit of the second row right seatbelt pretensioner. Normally the module periodically checks the resistance of this circuit and sends a firing pulse to the pretensioner in a crash. An open, a short, or resistance out of range sets the code and turns on the SRS warning light.

Symptoms

  • SRS or airbag warning light is on or flashing
  • A separate seatbelt warning light may be on
  • B0075 is stored in the SRS module
  • The rear right pretensioner may not fire in a collision
  • The light may come and go with bumps or when the seat is occupied

Possible causes

  1. Open or short in the pretensioner wiring
  2. Corroded or loose connector at the pretensioner
  3. Harness damaged under the rear seat or in the body pillar by cargo or earlier repairs
  4. Faulty pretensioner or its squib
  5. SRS module fault or software issue (uncommon)

How to diagnose

  1. Scan for codes with a tool that supports SRS and note all codes and freeze frame data
  2. Ask about recent work on the rear seat, trim or belts, and inspect the visible wiring
  3. Disconnect the battery and wait the time specified by the manufacturer before touching SRS connectors
  4. Inspect the pretensioner connector for corrosion, bent pins or a poor latch
  5. Check harness continuity and shorts to ground or power using the factory wiring diagram
  6. Never probe the squib with a regular multimeter, as it can cause deployment; follow the factory procedure only
  7. Swap in a known good pretensioner per factory procedure if the wiring tests good
  8. Clear the code and confirm it does not return

Common fixes

  • Clean or replace the connector and restore good contact
  • Repair or replace the damaged section of the harness
  • Replace the rear right seatbelt pretensioner
  • Reflash or replace the SRS module if it is confirmed faulty

Questions and answers

What does B0075 mean?

It is a fault in the control circuit of the rear right seatbelt pretensioner. The SRS module cannot be sure it can fire the pretensioner in a crash.

Can I drive with B0075?

Yes, the car drives normally. Protection for the rear right passenger is reduced, so get it checked soon.

Can I test the pretensioner myself?

You can inspect connectors and harness with the battery disconnected. Resistance tests on the squib and part replacement are best left to a professional because of the risk of accidental deployment.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.