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Home >> Toyota >> 2008 >> FJ Cruiser RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 69 (Supplemental Restraint System) >> Airbag System >> B1148/36: Front Airbag Sensor RH Circuit Malfunction >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR DTC 
    1. Turn the ignition switch to ON, and wait at least for 10 seconds.
    2. Clear the DTC stored in memory (see DTC CHECK/CLEAR  ).
    3. Turn the ignition switch to LOCK, and wait at least for 10 seconds.
    4. Turn the ignition switch to ON, and wait at least for 10 seconds.
    5. Check the DTC (see DTC CHECK/CLEAR  ).

      OK: DTC B1148/36 is output. 

      HINT:

      Codes other than code B1148/36 may be output at this time, but they are not relevant to this check.

    Fig 1: Checking For DTC
    G04438045Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: USE SIMULATION METHOD TO CHECK 

    OK: GO TO NEXT STEP 

  2. CHECK CONNECTION OF CONNECTOR 
    1. Turn the ignition switch to LOCK.
    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 and the front airbag sensor RH

      OK: The connectors are connected. 

    NG: CONNECT CONNECTOR 

    OK: GO TO NEXT STEP 

  3. CHECK WIRE HARNESS 
    1. Using a service wire, connect +SR and -SR on the A16 connector on the front airbag sensor RH side between the front airbag sensor RH and the center airbag sensor.
    2. Measure the resistance between +SR and -SR on the C26 connector on the center airbag sensor side between the front airbag sensor RH and the center airbag sensor.

      Standard resistance: Below 1 Ω 

    Fig 2: Checking Wire Harness
    G04438046Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step   7 

    OK: GO TO NEXT STEP 

  4. CHECK WIRE HARNESS (TO GROUND) 
    1. Measure the resistance between the body ground and each of +SR and -SR on the C26 connector on the center airbag sensor side between the front airbag sensor RH and center airbag sensor.

      Standard resistance: 1 kΩ or higher 

    Fig 3: Checking Wire Harness (To Ground)
    G04438047Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step   9 

    OK: GO TO NEXT STEP 

  5. CHECK WIRE HARNESS (TO B+) 
    1. Connect the negative (-) terminal cable to the battery, and wait at least for 2 seconds.
    2. Measure the voltage between the body ground and each of +SR and -SR on the C26 connector on the center airbag sensor side between the front airbag sensor RH and center airbag sensor.

      Standard voltage: Below 1 V 

    Fig 4: Checking Wire Harness (To B+)
    G04438048Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step   11 

    OK: GO TO NEXT STEP 

  6. CHECK CENTER AIRBAG SENSOR ASSEMBLY 
    1. Turn the ignition switch to LOCK.
    2. Disconnect the negative (-) terminal cable from the battery, and wait at least for 90 seconds.
    3. Connect the connector to the center airbag sensor.
    4. Change the front airbag sensor LH position with RH position.
    5. Connect the negative (-) terminal cable to the battery, and wait at least for 2 seconds.
    6. Turn the ignition switch to ON, and wait at least for 10 seconds.
    7. Clear the DTC stored in memory (see DTC CHECK/CLEAR  ).
    8. Turn the ignition switch to LOCK, and wait at least for 10 seconds.
    9. Turn the ignition switch to ON, and wait at least for 10 seconds.
    10. Check the DTC (see DTC CHECK/CLEAR  ).

      OK: DTC B1148/36 and B1149/37 are not output. 

      HINT:

      Codes other than code B1148/36 or B1149/37 may be output at this time, but they are not relevant to this check.

    Fig 5: Checking Center Airbag Sensor Assembly
    G04438049Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE FRONT AIRBAG SENSOR LH (DTC B1149/37 IS OUTPUT) 

    NG: REPLACE CENTER AIRBAG SENSOR ASSEMBLY (DTC B1148/36 IS OUTPUT) 

    OK: USE SIMULATION METHOD TO CHECK 

  7. CHECK ENGINE ROOM MAIN WIRE 
    1. Disconnect the engine room main wire connector on the center airbag sensor side.
    2. Using a service wire, connect +SR and -SR of the A16 engine room main wire connector on the front airbag sensor RH side.
    3. Measure the resistance between +SR and -SR of the EA1 engine room main wire connector on the center airbag sensor side.

      Standard resistance: Below 1 Ω 

    Fig 6: Checking Engine Room Main Wire
    G04438050Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE ENGINE ROOM MAIN WIRE 

    OK: GO TO NEXT STEP 

  8. CHECK NO. 2 ENGINE ROOM WIRE 
    1. Disconnect the No. 2 engine room wire connector from the dash wire.
    2. Using a service wire, connect +SR and -SR of the EA1 No. 2 engine room wire connector on the engine room main wire side.
    3. Measure the resistance between +SR and -SR of the IT1 No. 2 engine room wire connector on the dash wire side.

      Standard resistance: Below 1 Ω 

    Fig 7: Checking No. 2 Engine Room Wire
    G04438051Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE NO. 2 ENGINE ROOM WIRE 

    OK: REPAIR OR REPLACE DASH WIRE 

  9. CHECK ENGINE ROOM MAIN WIRE (TO GROUND) 
    1. Disconnect the engine room main wire connector on the center airbag sensor side.
    2. Measure the resistance between the body ground and each of +SR and -SR of the EA1 engine room main wire connector on the center airbag sensor side.

      Standard resistance: 1 MΩ or higher 

    Fig 8: Checking Engine Room Main Wire (To Ground)
    G04438052Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE ENGINE ROOM MAIN WIRE 

    OK: GO TO NEXT STEP 

  10. CHECK NO. 2 ENGINE ROOM WIRE (TO GROUND) 
    1. Disconnect the No. 2 engine room wire connector from the dash wire.
    2. Measure the resistance between the body ground and each of +SR and -SR of the IT1 No. 2 engine room wire connector on the dash wire side.

      Standard resistance: 1 MΩ or higher 

    Fig 9: Checking No. 2 Engine Room Wire (To Ground)
    G04438053Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE NO. 2 ENGINE ROOM WIRE 

    OK: REPAIR OR REPLACE DASH WIRE 

  11. CHECK ENGINE ROOM MAIN WIRE (TO B+) 
    1. Turn the ignition switch to LOCK.
    2. Disconnect the negative (-) terminal cable from the battery, and wait at least for 90 seconds.
    3. Disconnect the engine room main wire connector on the center airbag sensor side.
    4. Connect the negative (-) terminal cable to the battery, and wait at least for 2 seconds.
    5. Turn the ignition switch to ON.
    6. Measure the voltage between the body ground and each of +SR and -SR of the EA1 engine room main wire connector on the center airbag sensor side.

      Standard voltage: Below 1 V 

    Fig 10: Checking Engine Room Main Wire (To B+)
    G04438054Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE ENGINE ROOM MAIN WIRE 

    OK: GO TO NEXT STEP 

  12. CHECK NO. 2 ENGINE ROOM WIRE (TO B+) 
    1. Turn the ignition switch to LOCK.
    2. Disconnect the negative (-) terminal cable from the battery, and wait at least for 90 seconds.
    3. Disconnect the No. 2 engine room wire connector from the dash wire.
    4. Connect the negative (-) terminal cable to the battery, and wait at least for 2 seconds.
    5. Turn the ignition switch to ON.
    6. Measure the voltage between the body ground and each of +SR and -SR of the IT1 No. 2 engine room wire connector on the dash wire side.

      Standard voltage: Below 1 V 

    Fig 11: Checking No. 2 Engine Room Wire (To B+)
    G04438055Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE NO. 2 ENGINE ROOM WIRE 

    OK: REPAIR OR REPLACE DASH WIRE 

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