Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM000001BR9004X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1155/39; Curtain Shield Airbag Sensor Assembly LH Malfunction; 2007 MY LX470 [08/2006 -        ]

DTC

B1155/39

Curtain Shield Airbag Sensor Assembly LH Malfunction

DESCRIPTION

The curtain shield airbag sensor LH consists of the safing sensor, diagnosis circuit and lateral deceleration sensor, etc.

It receives signals from the lateral deceleration sensor, judges whether or not the SRS must be activated, and detects diagnosis system malfunction.

DTC B1155/39 is recorded when occurrence of a malfunction in the curtain shield airbag sensor LH is detected.

DTC No.

DTC Detection Condition

Trouble Area

B1155/39

Curtain shield airbag sensor LH malfunction
  • Curtain shield airbag sensor LH
  • No. 1 floor wire
  • Center airbag sensor assembly

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 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: DTC CHECK / CLEAR .

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

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

(e) Check the DTC 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: DTC CHECK / CLEAR .

OK:

DTC B1155/39 is output.

HINT:

Codes other than code B1155/39 may be output at this time, but they are not relevant to this check.
NG

USE SIMULATION METHOD TO CHECK

OK

2.

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.

(c) Check that the connectors are properly connected to the center airbag sensor and the curtain shield airbag sensor LH.

OK:

The connectors are connected.

NG

CONNECT CONNECTOR

OK

3.

CHECK NO. 1 FLOOR WIRE

(a) Using a service wire, connect CSL+ and CSL- of the S24 No. 1 floor wire connector on the curtain shield airbag sensor LH side.

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

Standard resistance:

Below 1 Ω
NG

REPAIR OR REPLACE NO. 1 FLOOR WIRE

OK

4.

CHECK NO. 1 FLOOR WIRE

(a) Using a service wire, connect VUCL and ESCL of the S24 No. 1 floor wire connector on the curtain shield airbag sensor LH side.

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

Standard resistance:

Below 1 Ω
NG

REPAIR OR REPLACE NO. 1 FLOOR WIRE

OK

5.

CHECK NO. 1 FLOOR WIRE (TO GROUND)

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

Standard resistance:

10 kΩor higher
NG

REPAIR OR REPLACE NO. 1 FLOOR WIRE

OK

6.

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 VUCL, CSL+, CSL- and ESCL of the C31 No. 1 floor wire connector on the center airbag sensor side.

Standard voltage:

Below 1 V
NG

REPAIR OR REPLACE NO. 1 FLOOR WIRE

OK

7.

CHECK CENTER AIRBAG 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.

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

(d) Change the curtain shield airbag sensor RH position with LH position.

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

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

(g) Clear the DTC stored in memory 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: DTC CHECK / CLEAR .

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

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

(j) Check the DTC 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: DTC CHECK / CLEAR .

OK:

DTC B1155/39 and B1154/38 are not output.

HINT:

Codes other than code B1155/39 B1154/38 may be output at this time, but they are not relevant to this check.
NG

REPLACE CURTAIN SHIELD AIRBAG SENSOR ASSEMBLY (DTC B1154/38 IS OUTPUT)

NG

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (DTC B1155/39 IS OUTPUT)

OK

USE SIMULATION METHOD TO CHECK