RX400h · Service Manual RESTRAINTS

B1100/31

Diagnostic trouble codes

DESCRIPTION

The center airbag sensor assembly circuit consists of the center airbag sensor assembly, safing sensor, drive circuit, diagnosis circuit and ignition control, etc.
It receives signals from the airbag sensor, judges whether or not the SRS must be activated, and detects diagnosis system malfunction.
DTC B1100/31 is recorded when a malfunction is detected in the center airbag sensor assembly circuit.
DTC No.
 DTC Detecting Condition
 Trouble Area
B1100/31
  1. Short in front airbag sensor RH circuit (to ground)
  2. Short in front airbag sensor RH circuit (to B+)
  3. Short in front airbag sensor RH circuit
  4. Short in front airbag sensor LH circuit (to ground)
  5. Short in front airbag sensor LH circuit (to B+)
  6. Short in front airbag sensor LH circuit
  7. Center airbag sensor assembly malfunction
  1. Center airbag sensor assembly
  2. Engine room main wire
  3. Instrument panel wire

WIRING DIAGRAM

H045980E02

INSPECTION PROCEDURE


1. CHECK FRONT AIRBAG SENSOR RH CIRCUIT (SHORT TO GROUND)

  1. C110443E05
    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 airbag sensor RH and the center airbag sensor assembly.

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

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    A7-2 (+SR) -
    Body ground
    		 Always
    		 1 MΩ or higher
    A7-1 (-SR) -
    Body ground
    		 Always
    		 1 MΩ or higher



NG
Go to step 8
OK


2. CHECK FRONT AIRBAG SENSOR RH CIRCUIT (SHORT TO B+)

  1. C110443E05
    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
    A7-2 (+SR) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V
    A7-1 (-SR) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V



NG
Go to step 9
OK


3. CHECK FRONT AIRBAG SENSOR RH CIRCUIT (SHORT)

  1. C110443E05
    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
    A7-2 (+SR) -
    A7-1 (-SR)
    		 Always
    		 1 MΩ or higher



NG
Go to step 10
OK


4. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND)

  1. C110443E06
    Disconnect the connector from the front airbag sensor LH.

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

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    A6-2 (+SL) -
    Body ground
    		 Always
    		 1 MΩ or higher
    A6-1 (-SL) -
    Body ground
    		 Always
    		 1 MΩ or higher



NG
Go to step 11
OK


5. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO B+)

  1. C110443E06
    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
    A6-2 (+SL) -
    Body ground
    		 Always
    		 Below 1 V
    A6-1 (-SL) -
    Body ground
    		 Always
    		 Below 1 V



NG
Go to step 12
OK


6. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)

  1. C110443E06
    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
    A6-2 (+SL) -
    A6-1 (-SL)
    		 Always
    		 1 MΩ or higher



NG
Go to step 13
OK


7. CHECK CENTER AIRBAG SENSOR ASSEMBLY

  1. H041086E06
    Connect the connectors to the center airbag sensor assembly, front airbag sensors RH and LH.

  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 B1100/31 is not output.



 NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK

USE SIMULATION METHOD TO CHECK

8. CHECK ENGINE ROOM MAIN WIRE (SHORT TO GROUND)

  1. C110444E05
    Disconnect the engine room main wire connector from the instrument panel wire.

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

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    A7-2 (+SR) -
    Body ground
    		 Always
    		 1 MΩ or higher
    A7-1 (-SR) -
    Body ground
    		 Always
    		 1 MΩ or higher



NG
REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

9. CHECK ENGINE ROOM MAIN WIRE (SHORT TO B+)

  1. C110444E05
    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 engine room main wire connector from the instrument panel wire.

  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
    A7-2 (+SR) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V
    A7-1 (-SR) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V



NG
REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

10. CHECK ENGINE ROOM MAIN WIRE (SHORT)

  1. C110444E05
    Disconnect the engine room main wire connector from the instrument panel wire.

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

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    A7-2 (+SR) -
    A7-1 (-SR)
    		 Always
    		 1 MΩ or higher



NG
REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

11. CHECK ENGINE ROOM MAIN WIRE (SHORT TO GROUND)

  1. C110444E06
    Disconnect the engine room main wire connector from the instrument panel wire.

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

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    A6-2 (+SL) -
    Body ground
    		 Always
    		 1 MΩ or higher
    A6-1 (-SL) -
    Body ground
    		 Always
    		 1 MΩ or higher



NG
REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

12. CHECK ENGINE ROOM MAIN WIRE (SHORT TO B+)

  1. C110444E06
    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 engine room main wire connector from the instrument panel wire.

  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
    A6-2 (+SL) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V
    A6-1 (-SL) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V



NG
REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

13. CHECK ENGINE ROOM MAIN WIRE (SHORT)

  1. C110444E06
    Disconnect the engine room main wire connector from the instrument panel wire.

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

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    A6-2 (+SL) -
    A6-1 (-SL)
    		 Always
    		 1 MΩ or higher



NG
REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK

REPAIR OR REPLACE INSTRUMENT PANEL WIRE


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