RX400h · Service Manual RESTRAINTS

B1140/32

Diagnostic trouble codes

DESCRIPTION

The side airbag sensor RH circuit consists of the safing sensor, the diagnostic circuit and the lateral deceleration sensor, etc.
If the center airbag sensor assembly receives signals from the lateral deceleration sensor, it judges whether or not the SRS should be activated.
DTC B1140/32 is recorded when a malfunction in the side airbag sensor RH circuit is detected.
DTC No.
 DTC Detecting Condition
 Trouble Area
B1140/32
  1. Open circuit in side airbag sensor RH circuit
  2. Short circuit in side airbag sensor RH circuit (to B+)
  3. Short circuit in side airbag sensor RH circuit (to ground)
  4. Side airbag sensor RH malfunction
  5. Center airbag sensor assembly malfunction
  1. Side airbag sensor RH
  2. Center airbag sensor assembly
  3. Floor wire

WIRING DIAGRAM

H043054E09

INSPECTION PROCEDURE


1. CHECK DTC

  1. C110446E01
    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 B1140/32 is not output.

    HINT:
    Codes other than code B1140/32 may be output at this time, but they are not related to this check.



 NG
Go to step 2
OK

USE SIMULATION 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 side airbag sensor RH.

    OK:
    The connectors are connected.



 NG
CONNECT CONNECTORS, THEN GO TO STEP 1
OK


3. CHECK FLOOR WIRE (OPEN)
C110451E03

  1. Disconnect the connectors from the center airbag sensor assembly and the side airbag sensor RH.

  1. Using a service wire, connect A25-17 (VUPR) and A25-15 (ESR) of connector "B".

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

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

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    S22-4 (VUPR) -
    S22-1 (ESR)
    		 Always
    		 Below 1 Ω

  1. C110450E03
    Using a service wire, connect A25-16 (SSR+) and A25-13 (SSR-) of connector "B".

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

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

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    S22-3 (SSR+) -
    S22-2 (SSR-)
    		 Always
    		 Below 1 Ω



NG
REPAIR OR REPLACE FLOOR WIRE
OK


4. CHECK FLOOR WIRE (SHORT TO B+)

  1. C109481E03
    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
    S22-4 (VUPR) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V
    S22-1 (ESR) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V
    S22-3 (SSR+) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V
    S22-2 (SSR-) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V



NG
REPAIR OR REPLACE FLOOR WIRE
OK


5. CHECK FLOOR WIRE (SHORT TO GROUND)

  1. C109481E03
    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
    S22-4 (VUPR) -
    Body ground
    		 Always
    		 1 MΩ or higher
    S22-1 (ESR) -
    Body ground
    		 Always
    		 1 MΩ or higher
    S22-3 (SSR+) -
    Body ground
    		 Always
    		 1 MΩ or higher
    S22-2 (SSR-) -
    Body ground
    		 Always
    		 1 MΩ or higher



NG
REPAIR OR REPLACE FLOOR WIRE
OK


6. CHECK SIDE AIRBAG SENSOR RH

  1. C110449E01
    Connect the connector to the center airbag sensor assembly.

  1. Interchange the side airbag sensor RH with LH and connect the connectors to them.

  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).

    Result:
    Proceed To
    		 Display (DTC Output)
    NG: A
    		 DTC B1140/32 is output.
    NG: B
    		 DTC B1141/33 is output.
    OK
    		 DTC B1140/32 and B1141/33 are not output.



NG:A
REPLACE CENTER AIRBAG SENSOR ASSEMBLY

NG:B
REPLACE SIDE AIRBAG SENSOR RH
OK

USE SIMULATION METHOD TO CHECK


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