Toyota RAV4 manuals

Toyota Sienna Service Manual: Front Airbag Sensor RH Circuit Malfunction

DTC B1148/36 Front Airbag Sensor RH Circuit Malfunction

DESCRIPTION

The front airbag sensor RH circuit consists of the center airbag sensor assembly and front airbag sensor RH. If the center airbag sensor assembly receives signals from the front airbag sensor RH, it judges whether or not the SRS should be activated.

DTC B1148/36 is recorded when a malfunction is detected in the front airbag sensor RH circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B1148/36

  • Open circuit in +SR wire harness or -SR wire harness of front airbag sensor RH circuit
  •  Front airbag sensor RH malfunction
  •  Center airbag sensor assembly malfunction
  • Front airbag sensor RH
  •  Center airbag sensor assembly
  •  Engine room main wire
  •  Instrument panel wire

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK DTC

 

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
  2.  Clear the DTCs stored in memory (5).
  3.  Turn the ignition switch to the LOCK position.
  4.  Turn the ignition switch to the ON position, and wait for at least 60 seconds.
  5.  Check the DTCs (5).

OK: DTC B1148/36 is not output.

HINT: Codes other than DTC B1148/36 may be output at this time, but they are not related to this check.

Go to step 2

 USE SIMULATION METHOD TO CHECK

2 CHECK CONNECTION OF CONNECTORS

CHECK CONNECTION OF CONNECTORS

  1. Turn the ignition switch to the LOCK position.
  2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3.  Check that the connectors are properly connected to the center airbag sensor assembly and the front airbag sensor RH.

OK: The connectors are connected.

CONNECT CONNECTORS

3 CHECK FRONT AIRBAG SENSOR RH CIRCUIT (OPEN)

CHECK FRONT AIRBAG SENSOR RH CIRCUIT (OPEN)

  1. Disconnect the connectors from the center airbag sensor assembly and the front airbag sensor RH.
  2.  Using a service wire, connect A21-9 (+SR) and A21-20 (- SR) of connector "B".

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

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

Standard resistance

Standard resistance

Go to step 5

4 CHECK FRONT AIRBAG SENSOR RH

CHECK FRONT AIRBAG SENSOR RH

  1. Disconnect the service wire from connector "B".
  2.  Connect the connector to the center airbag sensor assembly.
  3.  Interchange the front airbag sensor RH with LH, and connect the connectors to them.
  4.  Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
  5. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
  6.  Clear the DTCs stored in memory (5).
  7.  Turn the ignition switch to the LOCK position.
  8.  Turn the ignition switch to the ON position, and wait for at least 60 seconds.
  9.  Check the DTCs (5).

Result

Result

HINT: Codes other than DTC B1148/36 and B1149/37 may be output at this time, but they are not related to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

REPLACE FRONT AIRBAG SENSOR RH

USE SIMULATION METHOD TO CHECK

5 CHECK INSTRUMENT PANEL WIRE (OPEN)

CHECK INSTRUMENT PANEL WIRE (OPEN)

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

    HINT: The service wire has already been inserted into connector "B".

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

Standard resistance

Standard resistance

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

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