DTC Always Normal

SOURCE VOLTAGE DROP

CIRCUIT DESCRIPTION




The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly center 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.

A malfunction in this circuit is displayed differently from other codes. The source voltage drop is indicated

when the SRS warning light comes on without showing any DTCs.

A malfunction in this circuit is not recorded in the airbag sensor assembly center. The SRS warning light automatically goes off when the source voltage returns to normal.

Wiring Diagram:

Step 1-2:

Step 3-4:

INSPECTION PROCEDURE

CAUTION: Be sure to perform the following procedures before troubleshooting to avoid unexpected airbag deployment.

a. Turn the ignition switch off.
b. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
c. Disconnect the connectors from the airbag sensor assembly center.
d. Disconnect the connectors from the horn button assembly.
e. Disconnect the connectors from the front passenger airbag assembly.
f. Disconnect the connector from the instrument panel airbag assembly lower No.1.
g. Disconnect the connectors from the front seat airbag assembly LH and RH.
h. Disconnect the connectors from the curtain shield airbag assembly LH and RH.
i. Disconnect the connectors from the front seat outer belt assembly LH and RH.