RS–52 SUPPLEMENTAL RESTRAINT SYSTEM – TROUBLESHOOTING CIRCUIT INSPECTION DTC (Normal) Source Voltage Drop CIRCUIT DESCRIPTION The SRS is equipped with a voltage–increase circuit (DC–DC converter) in the center airbag sensor assembly in case the source voltage drops. When the battery voltage drops, the voltage–increase circuit (DC–DC converter) functions to increase the voltage of the SRS to normal voltage. The diagnostic system malfunction display for this circuit is different to other circuits–when the SRS warning light remains lit up and the diagnostic trouble code is a normal code, voltage source drop is indicated. Malfunction in this circuit is not recorded in the center airbag sensor assembly, and the voltage source returns to normal, after approx. 10 seconds the SRS warning light automatically goes off. DTC No. Diagnosis (Normal) Voltage source drop. WIRING DIAGRAM Junction Block No. 1 W 4 4 W 1B 1J W-R 4 W-R 1B1 AM1 AM2 Relay Block No. 2 Battery B 5 P-L 8 CIG 6 L-R14 ACC 1J 1G 3B-O 3 IGN 10 B-O13 IG2 1J 1G Ignition Switch Junction Block No. 1 Center Airbag Sensor Assembly R06901