B0103 · blink 12 – Short in D Squib Circuit (to B+)

System: SRS
Dashboard light: SRS airbag warning
Check-engine blink code: 12
Applies to: Cars with airbags (SRS)
Description: Short in D Squib Circuit (to B+)
Detection / symptoms: Detection: S Short circuit in D squib wire harness (to B+) S D squib malfunction S Spiral cable malfunction S Airbag sensor assembly malfunction
Possible causes: Steering wheel pad (D squib); Spiral cable; Airbag sensor assembly; Wire harness
What to check: Workshop check order (RM821E): CHECK D SQUIB CIRCUIT -> CHECK AIR BAG SENSOR ASSYCENTER -> CHECK D SQUIB -> CHECK INSTRUMENT PANEL WIRE -> CHECK SPIRAL CABLE SUB−ASSY
Confidence: high (official Toyota RM821E)

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