What does it mean?
B1423 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Side-airbag module (RH) (squib) system fault power supply circuit (short-circuited to power supply) .
Symptoms
- Airbag warning lamp permanently on and side protection disabled
- Fault commonly appears after seat heater repair, seat swap or accessory installation
- Code is current at every start and returns instantly after clearing
- Other seat related codes such as heating or position memory may set at the same time
- No effect on engine, brakes or general driveability
Likely causes
- Yellow squib harness chafed against a seat heater, seat motor or lumbar supply wire routed in the same loom
- Aftermarket seat heater, phone charger or alarm wiring spliced into the seat harness
- Water or corrosion in the under seat connector bridging a squib pin to an adjacent live pin
- Insulation crushed between the seat frame and a powered accessory bracket
- Internal fault in the side airbag module connecting the initiator to its supply side
- Damaged repair joint where a previous technician taped several circuits together
- Restraint control module output stage failure feeding voltage into the circuit
How to fix it
- Turn off the ignition, disconnect the battery and observe the specified reserve energy discharge period
- Unplug the side airbag module and inspect the connector for corrosion, moisture or a pin pushed across to a live terminal
- Trace the seat loom and separate the squib pair from any power carrying wires that share the same tape wrap
- Remove or correctly reroute aftermarket wiring spliced into the seat harness before doing anything else
- With the module unplugged, check whether supply voltage is present on the squib wires with the ignition on
- Repair the damaged insulation or renew the harness section, keeping the squib pair separated and protected
- Fit a new side airbag module only if the harness proves clean, then clear the codes and confirm the warning lamp goes out