SRS Warning Light Circuit Malfunction (Not On, Ign Sw ACC/ON)

SRS WARNING LIGHT CIRCUIT MALFUNCTION (DOES NOT LIGHT UP, WHEN IGNITION SWITCH IS TURNED TO ON)

CIRCUIT DESCRIPTION

The SRS warning light is located on the combination meter assy.
When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the ignition switch is turned from the LOCK position to the ON position, and then goes off automatically. If there is a malfunction in the SRS, the SRS warning light comes on to inform the driver of a problem. The SRS warning light signal is transmitted through CAN and BEAN to each ECU including the airbag sensor assy center.

Wiring Diagram:

Step 1:

INSPECTION PROCEDURE

HINT: Make sure that DTC B1281 has not been output. If DTC B1281 has been output, refer to the multiplex communication system.

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. Deactivate the LEXUS link system.
d. Disconnect the connectors from the airbag sensor assy center.
e. Disconnect the connectors from the horn button assy.
f. Disconnect the connector from the front passenger airbag assy.
g. Disconnect the connector from the instrument panel airbag assy lower No.1.
h. Disconnect the connector from the instrument panel airbag assy lower No.2.
i. Disconnect the connector from the front seat airbag assy LH.
j. Disconnect the connector from the front seat airbag assy RH.
k. Disconnect the connector from the curtain shield airbag assy LH. l. Disconnect the connector from the curtain shield airbag assy RH.
m. Disconnect the connector from the front seat outer belt assy LH.
n. Disconnect the connector from the front seat outer belt assy RH.
o. Disconnect the connectors from the rear seat 3 point type outer belt assy.