SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1181/18; Open in Driver Side Squib 2nd Step Circuit; 2007 MY LX470 [08/2006

Last Modified: 7-3-2017	6.8:8.0.40	Doc ID: RM0000017QV005X
Model Year Start: 2007	Model: LX470	Prod Date Range: [08/2006 - ]
Title: SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1181/18; Open in Driver Side Squib 2nd Step Circuit; 2007 MY LX470 [08/2006 - ]

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, the spiral cable and the steering wheel pad.

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

DTC B1181/18 is recorded when an open is detected in the driver side squib (2nd step) circuit.

DTC No.	DTC Detection Condition	Trouble Area
B1181/18	Open in driver side squib (2nd step) circuit Driver side squib (2nd step) malfunction Spiral cable malfunction Center airbag sensor assembly malfunction	Steering wheel pad (driver side squib (2nd step)) Spiral cable Center airbag sensor assembly Dash wire Column wire

WIRING DIAGRAM

Refer to DTC B1180/17 .

INSPECTION PROCEDURE

PROCEDURE

1.	CHECK DRIVER SIDE SQUIB (2ND STEP) CIRCUIT

(a) Turn the ignition switch to LOCK.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(d) Measure the resistance between D2+ and D2- of the black connector on the steering wheel pad (driver side squib (2nd step)) side between the center airbag sensor and the steering wheel pad (driver side squib (2nd step)).

Standard resistance:

Below 1 Ω

GO TO STEP 4

2.	CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Connect the connector to the center airbag sensor.

(b) Using a service wire, connect D2+ and D2- of the black connector on the steering wheel pad (driver side squib (2nd step)) side between the center airbag sensor and the steering wheel pad (driver side squib (2nd step)).

(d) Turn the ignition switch to ON, and wait at least for 10 seconds.

(e) Clear the DTC stored in memory .

(f) Turn the ignition switch to LOCK, and wait at least for 10 seconds.

(g) Turn the ignition switch to ON, and wait at least for 10 seconds.

(h) Check the DTC .

OK:

DTC B1181/18 is not output.

HINT:

Codes other than code B1181/18 may be output at this time, but they are not relevant to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

3.	CHECK DRIVER SIDE SQUIB (2ND STEP)

(a) Turn the ignition switch to LOCK.

(b) Disconnect the negative (-) terminal cable from the battery, and wait at least for 90 seconds.

(d) Connect the negative (-) terminal cable to the battery, and wait at least for 2 seconds.

(e) Turn the ignition switch to ON, and wait at least for 10 seconds.

(f) Clear the DTC stored in memory .

(g) Turn the ignition switch to LOCK, and wait at least for 10 seconds.

(h) Turn the ignition switch to ON, and wait at least for 10 seconds.

(i) Check the DTC .

OK:

DTC B1181/18 is not output.

HINT:

Codes other than code B1181/18 may be output at this time, but they are not relevant to this check.

REPLACE STEERING WHEEL PAD (DRIVER SIDE SQUIB (2ND STEP))

USE SIMULATION METHOD TO CHECK

4.	CHECK SPIRAL CABLE

(a) Disconnect the spiral cable connector from the column wire.

(b) Measure the resistance between D2+ and D2- of the black spiral cable connector on the steering wheel pad (driver side squib (2nd step)) side.

Standard resistance:

Below 1 Ω

REPLACE SPIRAL CABLE

5.	CHECK COLUMN WIRE

(a) Disconnect the column wire connector from the dash wire.

(b) Measure the resistance between D2+ and D2- of the A29 column wire connector on the spiral cable side.

Standard resistance:

Below 1 Ω

REPAIR OR REPLACE COLUMN WIRE

6.	CHECK DASH WIRE

(a) Measure the resistance between D2+ and D2- of the dash wire connector on the column wire side.

Standard resistance:

Below 1 Ω

REPAIR OR REPLACE DASH WIRE

USE SIMULATION METHOD TO CHECK