B0100 B0xxx · Body (B) Medium severity
Airbag Disable Switch Circuit
Fault in the manual passenger airbag on/off switch circuit (where fitted). The system cannot confirm the requested suppression state.
Severity guidance: Medium — drivability or emissions affected, book it in this week
Symptoms you will notice
- Passenger airbag indicator incorrect
- Airbag lamp on
- Switch position not recognised
Common causes
Ordered from most to least likely — start at the top.
- 1 Failed disable switch
- 2 Open or shorted wiring
- 3 Key-switch worn
- 4 Corroded connector
How to diagnose it
Cheapest and least invasive first — most of these codes are not a parts problem.
- ✓ Cycle the switch and watch the indicator change in live data.
- ✓ Check continuity across the switch in both positions.
- ✓ Inspect the connector behind the switch panel.
Repair options
- Replace the disable switch
- Repair the wiring
B0100 — frequently asked questions
Is my airbag on or off right now? +
Check the passenger airbag indicator and read the ECU status — never assume from the switch position alone.
Can I bypass the switch? +
No. Bypassing a safety system creates liability and fails inspection.
Confirm the diagnosis before you buy parts
Send us the code, freeze-frame data and the vehicle — our engineers will tell you what to test first.