Last Modified: 6-7-2017 6.8:8.0.40 Doc ID: RM000001D3Y005X
Model Year Start: 2007 Model: Land Cruiser Prod Date Range: [08/2006 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B0126/27,B0127/27; Seat Belt Buckle Switch LH Circuit Malfunction; 2007 MY Land Cruiser [08/2006 -        ]

DTC

B0126/27

Seat Belt Buckle Switch LH Circuit Malfunction

DTC

B0127/27

Seat Belt Buckle Switch LH Malfunction

DESCRIPTION

The seat belt buckle switch LH circuit consists of the center airbag sensor and the front seat inner belt LH (seat belt buckle switch LH). DTCs B0126/27 and B0127/27 are recorded when a malfunction is detected in the seat belt buckle switch LH circuit.

DTC No.

DTC Detection Condition

Trouble Area

B0126/B0127/27

Seat belt buckle switch LH circuit malfunction
  • Front seat inner belt LH (Seat belt buckle switch LH)
  • Center airbag sensor assembly
  • No. 1 floor wire

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK WIRE HARNESS (TO GROUND)

(a) Turn the ignition switch OFF.

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

(c) Measure the resistance of the wire harness side connector.

Standard resistance:

Tester Connection

Specified Condition

C25-19 (LBE+)*1 - Body ground

1 MΩ or higher

C25-2 (LBE-)*1 - Body ground

1 MΩ or higher

C25-11 (LBE+)*2 - Body ground

1 MΩ or higher

C25-7 (LBE-)*2 - Body ground

1 MΩ or higher

HINT:

*1: w/ Side airbag *2: w/o Side airbag

NG

GO TO STEP 6

OK

2.

CHECK WIRE HARNESS (TO +B)

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

(b) Turn the ignition switch ON.

(c) Measure the voltage of the wire harness side connector.

Standard voltage:

Tester Connection

Specified Condition

C25-19 (LBE+)*1 - Body ground

Below 1 V

C25-2 (LBE-)*1 - Body ground

Below 1 V

C25-11 (LBE+)*2 - Body ground

Below 1 V

C25-7 (LBE-)*2 - Body ground

Below 1 V

HINT:

*1: w/ Side airbag *2: w/o Side airbag
NG

GO TO STEP 7

OK

3.

CHECK FRONT SEAT INNER BELT ASSEMBLY LH

(a) Connect the connector of the front seat inner belt LH (seat belt buckle switch LH).

(b) Unfasten the seat belt for the driver's seat.

(c) Measure the resistance of the wire harness side connector.

Standard resistance:

Tester Connection

Specified Condition

C25-19 (LBE+)*1 - C25-2 (LBE-)*1

1 kΩ to 1.6 kΩ

C25-11 (LBE+)*2 - C25-7 (LBE-)*2

1 kΩ to 1.6 kΩ

HINT:

*1: w/ Side airbag *2: w/o Side airbag
NG

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

OK

4.

CHECK FRONT SEAT INNER BELT ASSEMBLY LH

(a) Fasten the seat belt for the driver's seat.

(b) Measure the resistance of the wire harness side connector.

Standard resistance:

Tester Connection

Specified Condition

C25-19 (LBE+)*1 - C25-2 (LBE-)*1

100 Ω to 500 Ω

C25-11 (LBE+)*2 - C25-7 (LBE-)*2

100 Ω to 500 Ω

HINT:

*1: w/ Side airbag *2: w/o Side airbag
NG

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

OK

5.

CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Turn the ignition switch OFF.

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

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

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

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

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

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

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

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

OK:

DTC B0126/B0127/27 is not output.
NG

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK

USE SIMULATION METHOD TO CHECK

6.

CHECK FRONT SEAT WIRE LH (TO GROUND)

(a) Disconnect the front seat wire LH connector from the No. 1 floor wire.

(b) Measure the resistance of the wire harness side connector.

Standard resistance:

Tester Connection

Specified Condition

BM4-3 (LBE+)*1 - Body ground

1 MΩ or higher

BM4-6 (LBE-)*1 - Body ground

1 MΩ or higher

BM4-3 (LBE+)*2 - Body ground

1 MΩ or higher

BM4-6 (LBE-)*2 - Body ground

1 MΩ or higher

HINT:

*1: w/ Side airbag *2: w/o Side airbag
NG

REPLACE FRONT SEAT WIRE LH

OK

REPLACE NO. 1 FLOOR WIRE

7.

CHECK FRONT SEAT WIRE LH (TO +B)

(a) Turn the ignition switch OFF.

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

(c) Disconnect the front seat wire LH connector from the No. 1 floor wire.

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

(e) Turn the ignition switch ON.

(f) Measure the voltage of the wire harness side connector.

Standard voltage:

Tester Connection

Specified Condition

BM4-3 (LBE+)*1 - Body ground

Below 1 V

BM4-6 (LBE-)*1 - Body ground

Below 1 V

BM4-3 (LBE+)*2 - Body ground

Below 1 V

BM4-6 (LBE-)*2 - Body ground

Below 1 V

HINT:

*1: w/ Side airbag *2: w/o Side airbag
NG

REPLACE FRONT SEAT WIRE LH

OK

REPLACE NO. 1 FLOOR WIRE