RX400h · Service Manual RESTRAINTS

B0126/27

Diagnostic trouble codes

DESCRIPTION

The seat belt buckle switch LH circuit consists of the center airbag sensor assembly and the front seat inner belt assembly LH (seat belt buckle switch LH).
DTC B0126/27 is recorded when a malfunction is detected in the seat belt buckle switch LH circuit.
DTC No.
 DTC Detecting Condition
 Trouble Area
B0126/27
  1. Short circuit in front seat inner belt assembly LH wire harness (to B+)
  2. Short circuit in front seat inner belt assembly LH wire harness (to ground)
  3. Open circuit in LBE+ wire harness or LBE- wire harness of front seat inner belt assembly LH
  4. Front seat inner belt assembly LH malfunction
  5. Center airbag sensor assembly malfunction
  1. Front seat inner belt assembly LH (Seat belt buckle switch LH)
  2. Center airbag sensor assembly
  3. Floor wire No.2

WIRING DIAGRAM

H043056E05

INSPECTION PROCEDURE


1. CHECK DTC

  1. C110423E01
    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 B0126/27 is not output.

    HINT:
    Codes other than code B0126/27 may be output at this time, but they are not related to this check.



 NG
Go to step 2
OK

USE SIMULATON METHOD TO CHECK

2. CHECK CONNECTION OF 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. Check that the connectors are properly connected to the center airbag sensor assembly and the front seat inner belt assembly LH.

    OK:
    The connectors are connected.



 NG
CONNECT CONNECTORS, THEN GO TO STEP 1
OK


3. CHECK FLOOR WIRE NO.2 (OPEN)

  1. C110424E02
    Disconnect the connectors from the center airbag sensor assembly and the front seat inner belt assembly LH.

  1. Using a service wire, connect A23-19 (LBE+) and A23-2 (LBE-) of connector "B".

    HINT:
    Do not forcibly insert a service wire into the terminals of the connector when connecting.

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

    Voltage:
    Tester connection
    		 Condition
    		 Specified condition
    B9-1 (LBE+) -
    B9-3 (LBE-)
    		 Always
    		 Below 1 V



NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


4. CHECK FLOOR WIRE NO.2 (SHORT TO B+)

  1. C111660E01
    Disconnect the service wire from connector "B".

  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
    B9-1 - Body ground
    		 Ignition switch ON
    		 Below 1 V
    B9-3 - Body ground
    		 Ignition switch ON
    		 Below 1 V



NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


5. CHECK FLOOR WIRE NO.2 (SHORT TO GROUND)

  1. C111660E01
    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. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    B9-1 - Body ground
    		 Always
    		 1 MΩ or higher
    B9-3 - Body ground
    		 Always
    		 1 MΩ or higher



NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


6. CHECK FRONT SEAT INNER BELT ASSEMBLY LH

  1. C110423E01
    Connect the connectors to the front seat inner 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 B0126/27 is not output.

    HINT:
    Codes other than code B0126/27 may be output at this time, but they are not related to this check.



 NG
Go to step 7
OK

USE SIMULATON METHOD TO CHECK

7. REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

  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. Replace the front seat inner belt assembly LH (Click here).

    HINT:
    Perform the inspection using parts from a normal vehicle if possible.


NEXT


8. CHECK CENTER AIRBAG SENSOR ASSEMBLY

  1. C110423E01
    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 B0126/27 is not output.

    HINT:
    Codes other than code B0126/27 may be output at this time, but they are not related to this check.



 NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK

END


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