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

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

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

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

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

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1885 Short in Rear Seat Cushion Squib LH Circuit

One of the following conditions is met:


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

  • A rear seat cushion airbag assembly LH malfunction.

  • An airbag ECU assembly malfunction.

  • Floor wire

  • Rear seat wire LH

  • Rear Seat Cushion airbag assembly LH

  • Airbag ECU assembly

 Comes on Applicable
B1886 Open in Rear Seat Cushion Squib LH Circuit

One of the following conditions is met:


  • The airbag ECU assembly detects an open circuit signal in the rear seat cushion squib LH circuit for 2 seconds.

  • A rear seat cushion airbag assembly LH malfunction.

  • An airbag ECU assembly malfunction.

  • Floor wire

  • Rear seat wire LH

  • Rear Seat Cushion airbag assembly LH

  • Airbag ECU assembly

 Comes on Applicable
B1887 Short to GND in Rear Seat Cushion Squib LH Circuit

One of the following conditions is met:


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

  • A rear seat cushion airbag assembly LH malfunction.

  • An airbag ECU assembly malfunction.

  • Floor wire

  • Rear seat wire LH

  • Rear Seat Cushion airbag assembly LH

  • Airbag ECU assembly

 Comes on Applicable
B1888 Short to B+ in Rear Seat Cushion Squib LH Circuit

One of the following conditions is met:


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

  • A rear seat cushion airbag assembly LH malfunction.

  • An airbag ECU assembly malfunction.

  • Floor wire

  • Rear seat wire LH

  • Rear Seat Cushion airbag assembly LH

  • Airbag ECU assembly

 Comes on Applicable
Table 1. *a Rear Seat Cushion Airbag Assembly LH *b Airbag ECU Assembly
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

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

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

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Tip:

To perform the simulation method, enter check mode (signal check) with the GTS (Click here ), and then wiggle each connector of the airbag system or drive the vehicle on various types of road (Click here).

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PROCEDURE


  1. Click here

    CHECK CONNECTORS


    1. B004YBSC04
      *1 Rear Seat Cushion Airbag Assembly LH
      *2 Airbag ECU Assembly
      *3 Rear Seat Wire LH
      *4 Floor Wire

      Turn the power switch off.

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

    3. Check that the connectors are properly connected to the rear seat cushion airbag assembly LH and airbag ECU assembly.

      OK
      The connectors are properly connected.
      Tip:

      If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the rear seat cushion airbag assembly LH and airbag ECU assembly.

    5. Check that the terminals of the connectors are not deformed or damaged.

      OK
      The terminals are not deformed or damaged.

    6. Check that the floor wire connector (on the rear seat cushion airbag assembly LH side) is not loose, deformed or damaged.

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

    7. Check that the short springs of the activation prevention mechanism of the floor wire connector are not deformed or damaged.

      OK
      The short springs are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPLACE FLOOR WIRE OR REAR SEAT WIRE LH

  2. Click here

    CHECK REAR SEAT CUSHION AIRBAG ASSEMBLY LH


    1. B004SV5C01
      *1 Rear Seat Cushion Airbag Assembly LH
      *2 Airbag ECU Assembly
      *3 SST
      *a

      Front view of wire harness connector

      (to Rear Seat Cushion Airbag Assembly LH)

      Connect the connector to the airbag ECU assembly.

    2. Connect the white wire side of SST (resistance: 2.1 Ω) to connector E.

      CAUTION:

      Never connect the tester to the rear seat cushion airbag assembly 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.

      09843-18061

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

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

    5. Clear the DTCs.

      Click here


      1. Body Electrical > SRS Airbag > Clear DTCs


    6. Turn the power switch off.

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

    8. Check for DTCs.

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      1. Body Electrical > SRS Airbag > Trouble Codes


      Result
      Proceed to
      DTC B1885, B1886, B1887 and B1888 are not output
      DTC B1885, B1886, B1887 or B1888 is output
      Tip:

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

    9. Turn the power switch off.

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

    11. Disconnect SST from connector E.


    • DTC B1885, B1886, B1887 and B1888 are not output

      REPLACE REAR SEAT CUSHION AIRBAG ASSEMBLY LHClick here

    • DTC B1885, B1886, B1887 or B1888 is outputClick here
  3. Click here

    CHECK REAR SEAT CUSHION AIRBAG ASSEMBLY CIRCUIT LH


    1. B004W9TC02
      *1 Rear Seat Cushion Airbag Assembly LH
      *2 Airbag ECU Assembly
      *3 Rear Seat Wire LH
      *4 Floor Wire
      *a

      Front view of wire harness connector

      (to Rear Seat Cushion Airbag Assembly LH)
      B004SZX Release the activation prevention mechanism

      Disconnect the floor wire from the airbag ECU assembly.

    2. Check for a short to B+ in the circuit.


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

      2. Turn the power switch on (IG).

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        R52-1 - Body ground Power switch on (IG) Below 1 V
        R52-2 - Body ground Power switch on (IG) Below 1 V

      4. Turn the power switch off.

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

    3. Check for an open in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        R52-1 - R52-2 Always Below 1 Ω

    4. Check for a short to ground in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        R52-1 - Body ground Always 1 MΩ or higher
        R52-2 - Body ground Always 1 MΩ or higher

    5. Check for a short in the circuit.


      1. Release the activation prevention mechanism built into connector B.

        Click here

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        R52-1 - R52-2 Always 1 MΩ or higher

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

      Result
      Proceed to
      OK
      NG

  4. Click here

    CHECK DTC


    1. B004TI6C03
      *1 Rear Seat Cushion Airbag Assembly LH
      *2 Airbag ECU Assembly

      Connect the connectors to the curtain shield airbag assembly LH and airbag ECU assembly.

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

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

    4. Clear the DTCs.

      Click here


      1. Body Electrical > SRS Airbag > Clear DTCs


    5. Turn the power switch off.

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

    7. Check for DTCs.

      Click here


      1. Body Electrical > SRS Airbag > Trouble Codes


      Result
      Proceed to
      DTC B1885, B1886, B1887 and B1888 are not output
      DTC B1885, B1886, B1887 or B1888 is output
      Tip:

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


    • DTC B1885, B1886, B1887 and B1888 are not output

      USE SIMULATION METHOD TO CHECKClick here

    • DTC B1885, B1886, B1887 or B1888 is output

      REPLACE AIRBAG ECU ASSEMBLYClick here

  5. Click here

    CHECK FLOOR WIRE


    1. B004V4QC02
      *1 Rear Seat Airbag Assembly LH
      *2 Airbag ECU Assembly
      *3 Floor Wire
      *4 Rear Seat Wire LH
      *a

      Front view of wire harness connector

      (to Rear Seat Airbag Assembly LH)
      B004SZX Release the activation prevention mechanism

      Disconnect the floor wire from the rear seat wire LH.

    2. Check for a short to B+ in the circuit.


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

      2. Turn the power switch on (IG).

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        LR 8-1 (RCL+) - Body ground power switch on (IG) Below 1 V
        LR 8-2 (RCL-) - Body ground power switch on (IG) Below 1 V

      4. Turn the power switch off.

      5. Disconnect the cable from the negative (-) auxiliary battery terminal.

    3. Check for an open in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        LR 8-1 (RCL+) - LR 8-2 (RCL-) Always Below 1 Ω

    4. Check for a short to ground in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        LR 8-1 (RCL+) - Body ground Always 1 MΩ or higher
        LR 8-2 (RCL-) - Body ground Always 1 MΩ or higher

    5. Check for a short in the circuit.


      1. Release the activation prevention mechanism built into connector B.

        Click here

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        LR 8-1 (RCL+) - LR 8-2 (RCL-) Always 1 MΩ or higher

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

      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE REAR SEAT WIRE LH

    • NG

      REPLACE FLOOR WIRE