TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams
p.059
SRS/Supplemental Restraint System60 / 102
p.061
DTC 12 Short in Squib Circuit (to B+) — MK4 Supra Supplemental Restraint System, page 60
100%
RS–60 SUPPLEMENTAL RESTRAINT SYSTEM – TROUBLESHOOTING DTC 12 Short in Squib Circuit (to B+) CIRCUIT DESCRIPTION The squib circuit consists of the center airbag sensor assembly, spiral cable, steering wheel pad and front pas- senger airbag assembly. It causes the SRS to deploy when the SRS deployment conditions are satisfied. The front airbag sensor detects the deceleration force in a frontal collision and is located in the front fender on the left and right sides. For details of the function of each component, see FUNCTION OF COMPONENTS on page RS–4. Diagnostic trouble code 12 is recorded when a B+ short is detected in the squib circuit or the front airbag sensor circuit. DTC No. | Diagnosis 12 • Short circuit in squib wire harness (to B +). • Squib malfunction. • Short circuit in front airbag sensor + S wire harness (to B +). • Front airbag sensors malfunction. • Spiral cable malfunction. • Center airbag sensor assembly malfunction. WIRING DIAGRAM Center Airbag Sensor Assembly Power Source Front Airbag Sensor RH Airbag Squib: P squib (Front Passenger Airbag Assembly) 1 G 2 P+ 2 BR 1 P- 10 B 2 -SR Safing Sensor 11 GR 1 +SR 1 Y 3 D+ Spiral Cable 2 L 4 D- Safing Sensor 9 W 2 -SL 8 R 1 +SL Airbag Squib: D squib (Steering Wheel Pad) Front Airbag Sensor LH R06802