B1100 – Airbag sensor assembly malfunction

System: SRS airbag
Dashboard light: Airbag (SRS) warning light
Check-engine blink code: —
Applies to: SRS-equipped cars
Description: Airbag sensor assembly malfunction
Possible causes: Trouble area: 1.Airbag sensor assembly
What to check: Checking points: 1.Disconnect battery and wait 90 s before touching SRS parts 2.Check connectors with the scanner, never with a test lamp
Confidence: medium (Toyota Echo 1999–2002 factory diagnostics, same XP10 platform; not confirmed on JDM 1SZ-FE)

From the factory service material. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights