RX400h · Service Manual RESTRAINTS

B1187/55

Diagnostic trouble codes

DESCRIPTION

The front passenger side squib 2nd step circuit consists of the center airbag sensor assembly and the front passenger airbag assembly.
The circuit instructs the SRS to deploy when deployment conditions are met.
DTC B1187/55 is recorded when a short to ground is detected in the front passenger side squib 2nd step circuit.
DTC No.
 DTC Detecting Condition
 Trouble Area
B1187/55
  1. Short circuit in passenger side squib 2nd step wire harness (to ground)
  2. Passenger side squib 2nd step malfunction
  3. Center airbag sensor assembly malfunction
  1. Front passenger airbag assembly (Passenger side squib 2nd step)
  2. Center airbag sensor assembly
  3. Instrument panel wire

WIRING DIAGRAM

Click here.

INSPECTION PROCEDURE


1. CHECK FRONT PASSENGER AIRBAG ASSEMBLY (PASSENGER SIDE SQUIB 2ND STEP)

  1. C111698E02
    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 passenger airbag assembly.

  1. Connect the white wire side of SST (resistance 2.1 Ω) to the instrument panel wire.

    CAUTION:
    Never connect a tester to the front passenger airbag assembly (Front passenger side squib 2nd step) 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 B1187/55 is not output.

    HINT:
    Codes other than DTC B1187/55 may be output at this time, but they are not related to this check.



 NG
Go to step 2
OK

REPLACE FRONT PASSENGER AIRBAG ASSEMBLY

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 instrument panel wire.

  1. Check that the instrument panel wire connector (on the front passenger airbag assembly 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 INSTRUMENT PANEL WIRE
OK


3. CHECK INSTRUMENT PANEL WIRE (PASSENGER SIDE SQUIB 2ND STEP CIRCUIT)

  1. C111717E03
    Disconnect the connector from the center airbag sensor assembly.

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

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    A28-2 (P2+) -
    Body ground
    		 Always
    		 1 MΩ or higher
    A28-1 (P2-) -
    Body ground
    		 Always
    		 1 MΩ or higher



NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


4. CHECK CENTER AIRBAG SENSOR ASSEMBLY

  1. C111699E01
    Connect the connectors to the front passenger airbag assembly 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 B1187/55 is not output.

    HINT:
    Codes other than DTC B1187/55 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


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