DTC Always Normal

SOURCE VOLTAGE DROP

CIRCUIT DESCRIPTION




The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assy 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 assy 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 to the LOCK position.
b. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
c. Disconnect the connectors from the airbag sensor assy center.
d. Disconnect the connectors from the horn button assy.
e. Disconnect the connector from the front passenger airbag assy.
f. w/ Side and curtain shield airbag:
Disconnect the connector from the front seat airbag assy LH.

g. w/ Side and curtain shield airbag:
Disconnect the connector from the front seat airbag assy RH.

h. w/ Side and curtain shield airbag:
Disconnect the connector from the curtain shield airbag assy LH.

i. w/ Side and curtain shield airbag:
Disconnect the connector from the curtain shield airbag assy RH.

j. Disconnect the connector from the front seat outer belt assy LH.
k. Disconnect the connector from the front seat outer belt assy RH.