SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1153/25; Seat Position Airbag Sensor Circuit Malfunction; 2006 MY LX470 [05/2005

Last Modified: 4-30-2014	6.6 C	Doc ID: RM0000017QT001X
Model Year: 2006	Model: LX470	Prod Date Range: [05/2005 - 01/2006]
Title: SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1153/25; Seat Position Airbag Sensor Circuit Malfunction; 2006 MY LX470 [05/2005 - 01/2006]

DTC

B1153/25

Seat Position Airbag Sensor Circuit Malfunction

DESCRIPTION

The seat position sensor circuit consists of the center airbag sensor and the seat position.

DTC B1153/25 is recorded when a malfunction is detected in the seat position sensor circuit.

DTC No.	DTC Detection Condition	Trouble Area
B1153/25	Seat position sensor assembly malfunction	Seat position sensor assembly Center airbag sensor assembly No. 1 floor wire

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.	CHECK FOR DTC

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

(b) Clear the DTC stored in memory .

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

(e) Check the DTC .

OK:

DTC B1153/25 is output.

HINT:

Codes other than code B1153/25 may be output at this time, but they are not relevant to this check.

USE SIMULATION METHOD TO CHECK

2.	CHECK CONNECTION OF CONNECTOR

(a) Turn the ignition switch to LOCK.

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

OK:

The connectors are connected.

CONNECT CONNECTOR

3.	CHECK NO. 1 FLOOR WIRE

(a) Using a service wire, connect LSP+ and LSP- of the B10 No. 1 floor wire connector on the seat position sensor assembly side.

(b) Measure the resistance between LSP+ and LSP- of the C31 No. 1 floor wire connector on the center airbag sensor side.

Standard resistance:

Below 1 Ω

REPAIR OR REPLACE NO. 1 FLOOR WIRE

4.	CHECK NO. 1 FLOOR WIRE (TO GROUND)

(a) Release the service wire from the No. 1 floor wire connector on the seat position sensor assembly side.

(b) Measure the resistance between the body ground and each of LSP+ and LSP- of the C31 No. 1 floor wire connector on the center airbag sensor side.

Standard resistance:

10 kΩ or higher

REPAIR OR REPLACE NO. 1 FLOOR WIRE

5.	CHECK NO. 1 FLOOR WIRE (TO B+)

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

(b) Turn the ignition switch to ON.

(c) Measure the voltage between the body ground and each of LSP+ and LSP- of the C31 No. 1 floor wire connector on the center airbag sensor side.

Standard voltage:

Below 1 V

REPAIR OR REPLACE NO. 1 FLOOR WIRE

6.	CHECK SEAT POSITION SENSOR ASSEMBLY

(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 B1153/25 is not output.

HINT:

Codes other than code B1153/25 may be output at this time, but they are not relevant to this check.

REPLACE SEAT POSITION SENSOR ASSEMBLY, THEN GO TO NEXT STEP

7.	CHECK CENTER AIRBAG SENSOR ASSEMBLY

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

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

(d) Clear the DTC stored in memory .

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

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

(g) Check the DTC .

OK:

DTC B1153/25 is not output.

HINT:

Codes other than code B1153/25 may be output at this time, but they are not relevant to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

USE SIMULATION METHOD TO CHECK