AIRBAG SYSTEM, Diagnostic DTC:B1639/81

DTC Code DTC Name
B1639/81 Driver Side Rear Sensor Initialization Incomplete

DESCRIPTION

The circuit for the driver side rear side collision sensor (to determine deployment of the rear window curtain shield airbag) is composed of the center airbag sensor assembly and driver side rear airbag sensor.

The driver side rear airbag sensor detects impacts to the vehicle and sends signals to the center airbag sensor assembly to determine if the airbag should be deployed.

DTC B1639/81 is recorded when a malfunction is detected in the circuit for the driver side rear side collision sensor (to determine deployment of the rear window curtain shield airbag).

DTC No. DTC Detection Condition Trouble Area
B1639/81

When one of following conditions is met:


  • The center airbag sensor assembly receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the circuit for the driver side rear side collision sensor (to determine deployment of the rear window curtain shield airbag) for 2 seconds.

  • Driver side - side airbag sensor (for rear side) malfunction

  • Driver side rear airbag sensor malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Driver side - side airbag sensor (for rear side)

  • Driver side rear airbag sensor

  • Center airbag sensor assembly

WIRING DIAGRAM

A0119GWE11
A0119GWE17

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CONNECTION OF CONNECTORS


    1. Turn the ignition switch off.

    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 driver side - side airbag sensor (for rear side) and driver side rear airbag sensor.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  2. CHECK CONNECTORS


    1. Disconnect the connectors from the driver side - side airbag sensor (for rear side) and driver side rear airbag sensor.

    2. Check that the connectors (on the driver side - side airbag sensor (for rear side) side and driver side rear airbag sensor side) are not damaged.

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  3. CHECK DRIVER SIDE - SIDE AIRBAG SENSOR (FOR REAR SIDE)

    A0118YEE02
    Text in Illustration
    *a Passenger Side - Side Airbag Sensor (for Rear Side)
    *b Driver Side - Side Airbag Sensor (for Front Side)

    1. Interchange the driver side - side airbag sensor (for rear side) with passenger side - side airbag sensor (for rear side) and connect the connectors to them.

    2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

    3. Turn the ignition switch to ON, and wait for at least 60 seconds.

    4. Clear the DTCs stored in the memory Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, and wait for at least 60 seconds.

    7. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1639/81 and B1649/82 are not output A
      DTC B1649/82 is output B
      DTC B1639/81 is output C

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE DRIVER SIDE - SIDE AIRBAG SENSOR (FOR REAR SIDE) Click here

    C

  4. CHECK FLOOR WIRE (SIDE AIRBAG SENSOR (FOR REAR SIDE) - REAR AIRBAG SENSOR)

    A011B2JE08
    Text in Illustration
    *A for LHD *B for RHD
    *a

    Front view of wire harness connector

    (to Driver Side Rear Airbag Sensor)

    		 *b

    Rear view of wire harness connector

    (to Driver Side - Side Airbag Sensor (for Rear Side))
    *c Driver Side Rear Airbag Sensor *d Driver Side - Side Airbag Sensor (for Rear Side)
    *e Floor Wire *f Connector C
    *g Connector B *h Service Wire

    1. Disconnect the connectors from the driver side - side airbag sensor (for rear side) and driver side rear airbag sensor.

    2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

    3. Turn the ignition switch to ON.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      G17-1 (BEL+) - Body ground Ignition switch ON Below 1 V
      G17-2 (BEL-) - Body ground Ignition switch ON Below 1 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      G16-1 (BER+) - Body ground Ignition switch ON Below 1 V
      G16-2 (BER-) - Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch off.

    6. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

    7. Using a service wire, connect terminals 2 and 1 of connector C.

      Note

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

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      G17-1 (BEL+) - G17-2 (BEL-) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      G16-1 (BER+) - G16-2 (BER-) Always Below 1 Ω

    9. Disconnect the service wire from connector C.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      G17-1 (BEL+) - G17-2 (BEL-) Always 1 MΩ or higher
      G17-1 (BEL+) - Body ground Always 1 MΩ or higher
      G17-2 (BEL-) - Body ground Always 1 MΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      G16-1 (BER+) - G16-2 (BER-) Always 1 MΩ or higher
      G16-1 (BER+) - Body ground Always 1 MΩ or higher
      G16-2 (BER-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK DRIVER SIDE REAR AIRBAG SENSOR

    A0117TGE15
    Text in Illustration
    *a Passenger Side Rear Airbag Sensor
    *b Driver Side - Side Airbag Sensor (for Rear Side)

    1. Interchange the driver side rear airbag sensor with passenger side rear airbag sensor and connect the connectors to them.

    2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

    3. Turn the ignition switch to ON, and wait for at least 60 seconds.

    4. Clear the DTCs stored in the memory Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, and wait for at least 60 seconds.

    7. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1639/81 and B1649/82 are not output A
      DTC B1649/82 is output B
      DTC B1639/81 is output C

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE DRIVER SIDE REAR AIRBAG SENSOR Click here

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here