AIRBAG SYSTEM, Diagnostic DTC:B1885/69, B1886/69, B1887/69, B1888/69

DTC Code DTC Name
B1885/69 Short in Rear Seat Cushion Squib LH Circuit
B1886/69 Open in Rear Seat Cushion Squib LH Circuit
B1887/69 Short to GND in Rear Seat Cushion Squib LH Circuit
B1888/69 Short to B+ in Rear Seat Cushion Squib LH Circuit

DESCRIPTION

The rear seat cushion squib LH circuit consists of the center airbag sensor assembly and the rear seat cushion squib LH.

The circuit instructs the SRS to deploy when deployment conditions are met.

These DTCs are recorded when a malfunction is detected in the rear seat cushion squib LH circuit.

Tech Tips

These DTCs are RHD only.

DTC Code Detection Condition Trouble Area
B1885/69

One of the following conditions is met:


  • The center airbag sensor assembly receives a line short circuit signal 5 times in the rear seat cushion squib LH circuit during primary check.

  • Rear seat cushion squib LH malfunction

  • Center airbag sensor assembly malfunction

  • No. 2 floor wire

  • Rear seat wire LH

  • Rear seat cushion airbag assembly LH (Rear seat cushion squib LH)

  • Center airbag sensor assembly
B1886/69

One of the following conditions is met:


  • The center airbag sensor assembly receives an open circuit signal in the rear seat cushion squib LH circuit for 2 seconds.

  • Rear seat cushion squib LH malfunction

  • Center airbag sensor assembly malfunction

  • No. 2 floor wire

  • Rear seat wire LH

  • Rear seat cushion airbag assembly LH (Rear seat cushion squib LH)

  • Center airbag sensor assembly
B1887/69

One of the following conditions is met:


  • The center airbag sensor assembly receives a short circuit to ground signal in the rear seat cushion squib LH circuit for 0.5 seconds.

  • Rear seat cushion squib LH malfunction

  • Center airbag sensor assembly malfunction

  • No. 2 floor wire

  • Rear seat wire LH

  • Rear seat cushion airbag assembly LH (Rear seat cushion squib LH)

  • Center airbag sensor assembly
B1888/69

One of the following conditions is met:


  • The center airbag sensor assembly receives a short circuit to B+ signal in the rear seat cushion squib LH circuit for 0.5 seconds.

  • Rear seat cushion squib LH

  • Center airbag sensor assembly malfunction

  • No. 2 floor wire

  • Rear seat wire LH

  • Rear seat cushion airbag assembly LH (Rear seat cushion squib LH)

  • Center airbag sensor assembly

WIRING DIAGRAM

A001DG1E11
*a Sf3
*b Rear Seat Cushion Squib LH
*c Center Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note


  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work Click here.

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Click here.

Tech Tips


  • Perform the simulation method by selecting "check mode" (signal check) with the intelligent tester Click here.

  • After selecting "check mode" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on various types of roads Click here.

PROCEDURE


  1. CHECK REAR SEAT CUSHION AIRBAG LH (REAR SEAT CUSHION SQUIB LH)

    A001DMUE02

    1. Turn the engine switch off.

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

    3. Disconnect the connectors from the rear seat cushion airbag LH.

    4. Connect the red wire side of SST (resistance: 2.1 Ω) to connector E (black connector).

      CAUTION:

      Never connect the tester to the rear seat cushion airbag LH (rear seat cushion squib LH) for measurement, as this may lead to a serious injury due to airbag deployment.

      Note


      • Do not forcibly insert SST into the terminals of the connector when connecting SST.

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061

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

    6. Turn the engine switch on (IG), and wait for at least 60 seconds.

    7. Clear the DTCs Click here.

    8. Turn the engine switch off.

    9. Turn the engine switch on (IG), and wait for at least 60 seconds.

    10. Check for DTCs Click here.

      OK
      DTC B1885, B1886, B1887, B1888 or 69 is not output.

      Tech Tips

      Codes other than DTC B1885, B1886, B1887, B1888 or 69 may be output at this time, but they are not related to this check.


    OK

    REPLACE REAR SEAT CUSHION ASSEMBLY LH Click here

    NG

  2. CHECK CONNECTOR


    1. Turn the engine switch off.

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

    3. Disconnect SST from connector E.

    4. Check that the No. 2 floor wire and rear seat wire connectors (on the rear seat cushion airbag LH side) are not damaged.

      OK
      The lock button is not disengaged, or the claw of the lock is not damaged or deformed.

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  3. CHECK REAR SEAT CUSHION SQUIB LH CIRCUIT

    A001EIVE02
    *1 Rear Seat Cushion Squib LH
    *2 Center Airbag Sensor Assembly
    *3 Front view of wire harness connector: (to Rear Seat Cushion Squib LH)
    *4 Connector E

    1. Disconnect the connectors from the center airbag sensor assembly.

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

    3. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      f37-1 (RCL+) - Body ground Engine switch on (IG) Below 1 V
      f37-21 (RCL-) - Body ground Engine switch on (IG) Below 1 V

    5. Turn the engine switch off.

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      f37-1 (RCL+) - f37-2 (RCL-) Always Below 1 Ω

    8. Release the activation prevention mechanism built into connector B Click here.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      f37-1 (RCL+) - f37-2 (RCL-) Always 1 MΩ or higher
      f37-1 (RCL+) - Body ground Always 1 MΩ or higher
      f37-2 (RCL-) - Body ground Always 1 MΩ or higher

    OK

    CHECK CENTER AIRBAG SENSOR ASSEMBLY Click here

    NG

  4. CHECK REAR SEAT WIRE LH

    A001EORE02

    1. Restore the released activation prevention mechanism of connector B to the original condition.

    2. Disconnect the No. 2 floor wire connector from the rear seat wire LH.

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

    4. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      Sf3-1 (RCL+) - Body ground Engine switch on (IG) Below 1 V
      Sf3-2 (RCL-) - Body ground Engine switch on (IG) Below 1 V

    6. Turn the engine switch off.

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      Sf3-1 (RCL+) - Sf3-2 (RCL-) Always Below 1 Ω

    9. Release the activation prevention mechanism built into connector D Click here.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      Sf3-1 (RCL+) - Sf3-2 (RCL-) Always 1 MΩ or higher
      Sf3-1 (RCL+) - Body ground Always 1 MΩ or higher
      Sf3-2 (RCL-) - Body ground Always 1 MΩ or higher

    OK

    REPLACE NO. 2 FLOOR WIRE

    NG

    REPLACE REAR SEAT WIRE LH

  5. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. Connect the connectors to the rear seat airbag LH and the center airbag sensor assembly.

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

    3. Turn the engine switch on (IG), and wait for at least 60 seconds.

    4. Clear the DTCs Click here.

    5. Turn the engine switch off.

    6. Turn the engine switch on (IG), and wait for at least 60 seconds.

    7. Check for DTCs Click here.

      OK
      DTC B1885, B1886, B1887, B1888 or 69 is not output.

      Tech Tips

      Codes other than DTC B1885, B1886, B1887, B1888 or 69 may be output at this time, but they are not related to this check.


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here