Toyota Sienna Service Manual: Short to B+ in Side Squib LH Circuit

DTC B0118/46 Short to B+ in Side Squib LH Circuit

DESCRIPTION

The side squib LH circuit consists of the center airbag sensor assembly and the front seat side airbag assembly LH (side squib LH).

This circuit instructs the SRS to deploy when deployment conditions are met.

DTC B0118/46 is recorded when a short to B+ is detected in the side squib LH circuit

INSPECTION PROCEDURE

HINT:

•  Perform the simulation method by selecting the "check mode" (signal check) with the intelligent tester (8).
•  After selecting the "check mode" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city or rough road

1 CHECK FRONT SEAT SIDE AIRBAG ASSEMBLY LH (SIDE SQUIB LH)

1. Turn the ignition switch to the LOCK position.
2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3.  Disconnect the connectors from the front seat side airbag assembly LH.
4.  Connect the black wire side of SST (resistance 2.1 Ω) to the floor wire.

CAUTION: Never connect a tester to the front seat side airbag assembly LH (side squib LH) for measurement, as this may lead to a serious injury due to airbag deployment.

SST 09843-18060

5.  Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
6.  Turn the ignition switch to the ON position, and wait for at least 60 seconds.
7.  Clear the DTCs stored in memory (5).
8.  Turn the ignition switch to the LOCK position.
9.  Turn the ignition switch to the ON position, and wait for at least 60 seconds.
10.  Check the DTCs

OK: DTC B0118/46 is not output.

HINT: Codes other than DTC B0118/46 may be output at this time, but they are not related to this check.

Go to step 2

REPLACE FRONT SEAT ASSEMBLY LH

2 CHECK FLOOR WIRE (SIDE SQUIB LH CIRCUIT)

1. Turn the ignition switch to the LOCK position.
2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3.  Disconnect the SST (resistance 2.1 Ω) from the floor wire.
4.  Disconnect the connector from the center airbag sensor assembly.
5.  Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
6.  Turn the ignition switch to the ON position.
7.  Measure the voltage according to the value(s) in the table below.

Standard voltage

REPAIR OR REPLACE FLOOR WIRE

3 CHECK CENTER AIRBAG SENSOR ASSEMBLY

1. Turn the ignition switch to the LOCK position.
2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. ) Connect the connectors to the front seat side airbag assembly LH and the center airbag sensor assembly.
4.  Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
5.  Turn the ignition switch to the ON position, and wait for at least 60 seconds.
6.  Clear the DTCs stored in memory (5).
7.  Turn the ignition switch to the LOCK position.
8.  Turn the ignition switch to the ON position, and wait for at least 60 seconds.
9.  Check the DTCs (5).

OK: DTC B0118/46 is not output. HINT: Codes other than code B0118/46 may be output at this time, but they are not related to this check

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

USE SIMULATION METHOD TO CHECK