Toyota Sienna Service Manual: Open in Driver Side Squib 2nd Step Circuit

DTC B1181/18 Open in Driver Side Squib 2nd Step Circuit

DESCRIPTION

The driver side squib 2nd step circuit consists of the center airbag sensor assembly, the spiral cable and the steering pad.

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

DTC B1181/18 is recorded when an open circuit is detected in the driver side squib 2nd step 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 STEERING PAD (DRIVER SIDE SQUIB 2ND STEP)

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 steering pad.
4.  Connect the white wire side of SST (resistance 2.1 Ω) to the spiral cable.

CAUTION: Never connect a tester to the steering pad (driver side squib 2nd step) 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 (5).

OK: DTC B1181/18 is not output. HINT: Codes other than DTC B1181/18 may be output at this time, but they are not related to this check.

Go to step 2

REPLACE STEERING PAD

2 CHECK DRIVER SIDE SQUIB 2ND STEP 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 spiral cable.
4.  Disconnect the connector from the center airbag sensor assembly.
5.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Go to step 4

3 CENTER AIRBAG SENSOR ASSEMBLY

1. Connect the connectors to the steering pad and the center airbag sensor assembly.
2.  Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
3.  Turn the ignition switch to the ON position, and wait for at least 60 seconds.
4.  Clear the DTCs stored in memory (5).
5.  Turn the ignition switch to the LOCK position.
6.  Turn the ignition switch to the ON position, and wait for at least 60 seconds.
7.  Check the DTCs (5).

OK: DTC B1181/18 is not output.

HINT: Codes other than DTC B1181/18 may be output at this time, but they are not related to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

USE SIMULATION METHOD TO CHECK

4 CHECK INSTRUMENT PANEL WIRE

1. Disconnect the instrument panel wire connector from the spiral cable.
2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

5 CHECK SPIRAL CABLE

1. Measure the resistance according to the value(s) in the table below.

Standard resistance

REPLACE SPIRAL CABLE

USE SIMULATION METHOD TO CHECK