DTC    B0138/72    Short to B+ in Front Pretensioner Squib LH Circuit

for Preparation Click here


DESCRIPTION

The front pretensioner squib LH circuit consists of the center airbag sensor assembly and the front seat outer belt assembly LH (front pretensioner squib LH).
This circuit instructs the SRS to deploy when deployment conditions are met.
DTC B0138/72 is recorded when a short to B+ is detected in the front pretensioner squib LH circuit.

DTC No.
DTC Detecting Condition
Trouble Area
B0138/72
  1. Short circuit in front pretensioner squib LH wire harness (to B+)
  2. Front pretensioner squib LH malfunction
  3. Center airbag sensor assembly malfunction
  1. Front seat outer belt assembly LH (Front pretensioner squib LH)
  2. Center airbag sensor assembly
  3. Floor wire No.2

WIRING DIAGRAM

Click here.

INSPECTION PROCEDURE

1.CHECK FRONT SEAT OUTER BELT ASSEMBLY LH (FRONT PRETENSIONER SQUIB LH)


    C110441E02

  1. Turn the ignition switch to the LOCK position.

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

  1. Disconnect the connectors from the front seat outer belt assembly LH.

  1. Connect the white wire side of SST (resistance 2.1 Ω) to the floor wire No.2.

    CAUTION:
    Never connect a tester to the front seat outer belt assembly LH (Front pretensioner squib LH) for measurement, as this may lead to a serious injury due to airbag deployment.

    NOTICE:
    Do not forcibly insert the SST into the terminals of the connector when connecting.
    Insert the SST straight into the terminals of the connector.

SST
09843-18060  

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

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the ignition switch to the LOCK position.

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Check the DTCs (Click here).

    OK:
    DTC B0138/72 is not output.

    HINT:
    Codes other than DTC B0138/72 may be output at this time, but they are not related to this check.



NG
Go to step 2
OK

REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH 

2.CHECK CONNECTORS

  1. Turn the ignition switch to the LOCK position.

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

  1. Disconnect the SST (resistance 2.1 Ω) from the floor wire No.2.

  1. Check that the floor wire No.2 connector (on the front seat outer belt assembly LH side) is not damaged.

    OK:
    The lock button is not disengaged, and the claw of the lock is not deformed or damaged.



NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


3.CHECK FLOOR WIRE NO.2 (FRONT PRETENSIONER SQUIB LH CIRCUIT)


    C110435E02

  1. Disconnect the connector from the center airbag sensor assembly.

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

  1. Turn the ignition switch to the ON position.

  1. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester connection
    		Condition
    		Specified condition
    P24-1 (PL+) -
    Body ground
    		Ignition switch ON
    		Below 1 V
    P24-2 (PL-) -
    Body ground
    		Ignition switch ON
    		Below 1 V



NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


4.CHECK CENTER AIRBAG SENSOR ASSEMBLY


    C110442E01

  1. Turn the ignition switch to the LOCK position.

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

  1. Connect the connectors to the front seat outer belt assembly LH and the center airbag sensor assembly.

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

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the ignition switch to the LOCK position.

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Check the DTCs (Click here).

    OK:
    DTC B0138/72 is not output.

    HINT:
    Codes other than DTC B0138/72 may be output at this time, but they are not related to this check.



NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK

USE SIMULATION METHOD TO CHECK