Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM0000017Q8005X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B0138/72; Short to B+ in Front Pretensioner Squib LH Circuit; 2007 MY LX470 [08/2006 -        ]

DTC

B0138/72

Short to B+ in Front Pretensioner Squib LH Circuit

DESCRIPTION

The front pretensioner squib LH circuit consists of the center airbag sensor and seat belt pretensioner LH.

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

DTC B0138/72 is recorded when a B+ short is detected in the front pretensioner squib LH circuit.

DTC No.

DTC Detection Condition

Trouble Area

B0138/72
  • Short in front pretensioner squib LH circuit (to B+)
  • Front pretensioner squib LH malfunction
  • Center airbag sensor assembly malfunction
  • Seat belt pretensioner LH (front pretensioner squib LH)
  • Center airbag sensor assembly
  • No. 1 floor wire

WIRING DIAGRAM

Refer to DTC B0135/73 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B0135/73; Short in Front Pretensioner Squib LH Circuit+ .

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK NO. 1 FLOOR WIRE (FRONT PRETENSIONER SQUIB LH CIRCUIT)

(a) Turn the ignition switch to LOCK.

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

(c) Disconnect the connectors from the center airbag sensor and the front seat outer belt LH.

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

(e) Turn the ignition switch to ON.

(f) Measure the voltage between the body ground and PL+ of the P20 No. 1 floor wire connector on the seat belt pretensioner LH (front pretensioner squib LH) side.

Standard voltage:

Below 1 V
NG

REPAIR OR REPLACE NO. 1 FLOOR WIRE

OK

2.

CHECK CENTER AIRBAG SENSOR ASSEMBLY

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

(b) Using a service wire, connect PL+ and PL- of the P20 No. 1 floor wire connector on the seat belt pretensioner LH (front pretensioner squib LH) side.

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

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

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

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

OK:

DTC B0138/72 is not output.

HINT:

Codes other than code B0138/72 may be output at this time, but they are not relevant to this check.

NG

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK

3.

CHECK FRONT PRETENSIONER SQUIB LH

(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 seat belt pretensioner LH (front pretensioner squib LH) connector.

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

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

OK:

DTC B0138/72 is not output.

HINT:

Codes other than code B0138/72 may be output at this time, but they are not relevant to this check.

NG

REPLACE SEAT BELT PRETENSIONER LH (FRONT PRETENSIONER SQUIB LH)

OK

USE SIMULATION METHOD TO CHECK