What does it mean?
B1424 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Side-airbag module (RH) (squib ignition drive circuit) .
Symptoms
- Airbag warning lamp on and staying on with the side airbag disabled
- Right side airbag will not deploy even though the module and wiring look untouched
- Code sets again on the first ignition cycle after being erased
- May be joined by other restraint codes if the control module itself is at fault
- Nothing unusual in the way the vehicle starts, runs or brakes
Likely causes
- Corroded or partly mated connector between the restraint module and the right side squib branch
- High resistance joint in the firing loop caused by a poor repair splice or a stretched terminal
- Damaged section of the yellow harness between the module in the centre tunnel and the seat
- Water reaching the restraint module connector after a leaking windscreen, heater matrix or door membrane
- Internal failure of the firing driver stage inside the restraint control module
- Wrong or incompatible airbag module presenting a load the driver cannot verify
- Low system voltage during the module self test producing a false drive circuit report
How to fix it
- Disconnect the battery and wait the specified reserve discharge time before any work on the restraint system
- Check the battery and charging system voltage, since a weak supply can make the module fail its own drive circuit test
- Unplug and inspect the restraint control module connectors for water, corrosion, bent pins and unlatched locks, then reseat them fully
- Follow the yellow harness from the module through the tunnel to the seat, checking for crush damage and poor previous repairs
- Substitute the approved load tool for the airbag module and see whether the drive circuit fault clears, which separates harness from module
- Repair the harness or connector faults found and retest before ordering any control unit
- Replace the restraint control module only when the wiring, the supply and the airbag module have all been proven good, then code it to the vehicle and clear the memory