Airbags

B00F4 — Second Row Right Inflatable Seatbelt Deployment Control Fault

Severity: high Drive with care, to a shop

What B00F4 means

The supplemental restraint system (SRS) control module continuously tests the circuit that controls deployment of the inflatable seatbelt at the rear right seat, looking for opens, shorts and out-of-range resistance. B00F4 sets when that test fails. In a crash, an inflatable belt fills with gas to spread the load across more of the occupant's chest than a normal belt.

Symptoms

  • Airbag/SRS warning light on or flashing
  • Message about a seatbelt or restraint system fault
  • Restraint system may be disabled, so the belt may not inflate in a crash
  • Rear right belt reminder or buckle indicator behaving oddly

Possible causes

  1. Damaged or loose connector under the rear seat or at the belt anchor
  2. Open, chafed or shorted wiring in the inflatable belt circuit
  3. Faulty inflatable belt assembly or its deployment module
  4. Corrosion from moisture or interior cleaning
  5. Restraint control module failure (less common)

How to diagnose

  1. Scan all modules with an SRS-capable tool and note any other rear belt or restraint codes
  2. Inspect the connectors and harness under the rear right seat and at the belt mounting for damage, moisture and corrosion
  3. Check the belt for damage or twisting and confirm the buckle works and the belt is installed correctly
  4. Verify power and ground to the SRS module and the belt circuit
  5. Measure circuit resistance per service data, never probing the inflator directly with a meter
  6. Clear the code and see if it returns after a key cycle and test drive

Common fixes

  • Repair or replace the damaged harness and connector
  • Replace the second row right inflatable seatbelt assembly
  • Replace and program the SRS control module
  • Clean corroded contacts and fix the source of moisture

Questions and answers

What does B00F4 mean?

The SRS module found a fault in the control circuit of the rear right inflatable seatbelt. That seat's crash protection may not work as designed.

Can I just clear B00F4 myself?

A scan tool can clear it, but it will return if the fault remains. Work on SRS parts needs care: disconnect the battery and follow the manufacturer's procedure, or have a shop do it.

Is it safe to drive with the SRS light on?

Engine and brakes are unaffected, but some belts or airbags may not deploy in a crash. Get it diagnosed as soon as you can.

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.