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

Toyota Sienna Service Manual / Supplemental restraint system / Airbag system / Diagnostic trouble code chart / 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.

DTC No.	DTC Detecting Condition	Trouble Area
B1181/18	Open circuit in D2+ wire harness or D2- wire harness of driver side squib 2nd step Driver side squib 2nd step malfunction Spiral cable malfunction Center airbag sensor assembly malfunction	Steering pad (Driver side squib 2nd step) Spiral cable Center airbag sensor assembly Instrument panel wire

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)

CHECK STEERING PAD (DRIVER SIDE SQUIB 2ND STEP)

Turn the ignition switch to the LOCK position.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Disconnect the connectors from the steering pad.
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.

NOTICE: Do not forcibly insert the SST into the terminals of the connector when connecting.

Insert the SST straight into the terminals of the connector.

SST 09843-18060

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

CHECK DRIVER SIDE SQUIB 2ND STEP CIRCUIT

Turn the ignition switch to the LOCK position.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Disconnect the SST (resistance 2.1 Ω) from the spiral cable.
Disconnect the connector from the center airbag sensor assembly.
Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

Go to step 4

3 CENTER AIRBAG SENSOR ASSEMBLY

CENTER AIRBAG SENSOR ASSEMBLY

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

CHECK INSTRUMENT PANEL WIRE

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

Standard resistance

Standard resistance

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

5 CHECK SPIRAL CABLE

CHECK SPIRAL CABLE

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

Standard resistance

Standard resistance

REPLACE SPIRAL CABLE

USE SIMULATION METHOD TO CHECK

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