B1903

DTC B1903 SHORT IN FRONT P/T SQUIB (RH) CIRCUIT (TO B+)

CIRCUIT DESCRIPTION

DTC Detecting Condition:

The front P/T squib RH circuit consists of the airbag sensor assy center and the front seat outer belt assy RH.

This circuit instructs the SRS to deploy when deployment conditions are met.
DTC B1903 is recorded when a short to B+ is detected in the front P/T squib RH circuit.

Wiring Diagram:

Step 1:

Step 2:

Step 3:

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. 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.