AIRBAG SYSTEM, Diagnostic DTC:B1855/63, B1856/63, B1857/63, B1858/63

DTC Code DTC Name
B1855/63 Short in Rear Side Squib LH Circuit
B1856/63 Open in Rear Side Squib LH Circuit
B1857/63 Short to GND in Rear Side Squib LH Circuit
B1858/63 Short to B+ in Rear Side Squib LH Circuit

DESCRIPTION

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

DTC Code Detection Condition Trouble Area
B1855/63

  • The center airbag sensor receives a line short circuit signal in the rear side squib LH circuit during the primary check.

  • Rear side squib LH malfunction

  • Center airbag sensor malfunction

  • No. 2 floor wire

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

  • Center airbag sensor assembly
B1856/63

  • The center airbag sensor receives an open circuit signal in the rear side squib LH circuit.

  • Rear side squib LH malfunction

  • Center airbag sensor malfunction

  • No. 2 floor wire

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

  • Center airbag sensor assembly
B1857/63

  • The center airbag sensor receives a short circuit to ground signal in the rear side squib LH circuit.

  • Rear side squib LH malfunction

  • Center airbag sensor malfunction

  • No. 2 floor wire

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

  • Center airbag sensor assembly
B1858/63

  • The center airbag sensor receives a short circuit to B+ signal in the rear side squib LH circuit.

  • Rear side squib LH malfunction

  • Center airbag sensor malfunction

  • No. 2 floor wire

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

  • Center airbag sensor assembly

WIRING DIAGRAM

A01NCZ5E09

INSPECTION PROCEDURE

Tech Tips


  • Perform the simulation method by selecting check mode (Signal Check) using 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 a city or rough road Click here.

PROCEDURE


  1. CHECK CONNECTORS


    1. A01NH4SE01
      Text in Illustration
      *1 Rear Side Squib LH
      *2 Center Airbag Sensor Assembly
      *3 No. 2 Floor Wire

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      Note

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the rear seat side airbag assembly LH and center airbag sensor assembly.

      OK
      The connectors are properly connected.

      Tech Tips

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

    4. Disconnect the connectors from the rear seat side airbag assembly LH and center airbag sensor assembly.

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

      OK
      The terminals are not deformed or damaged.

    6. Check that the short spring for the No. 2 floor wire with the activation prevention mechanism is not deformed or damaged.

      OK
      The short spring is not deformed or damaged.

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  2. CHECK REAR SEAT SIDE AIRBAG ASSEMBLY LH (REAR SIDE SQUIB LH)


    1. A01NHQIE02
      Text in Illustration
      *1 Rear Side Squib LH
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Rear Seat Side Airbag Assembly LH)
      *4 Connector C

      Connect the connector to the center airbag sensor assembly.

    2. Connect SST (resistance 2.1 Ω) to connector C.

      CAUTION:

      Never connect the tester to the rear seat side airbag assembly LH (rear side 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.

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061

    3. Connect the cable to the negative (-) battery terminal.

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

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

    6. Turn the power switch off.

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

    8. Check for DTCs Click here.

      OK
      DTC B1855, B1856, B1857, B1858 or 63 is not output.

      Tech Tips

      Codes other than DTC B1855, B1856, B1857, B1858 and 63 may be output at this time, but they are not related to this check.


    NG

    CHECK NO. 2 FLOOR WIRE (REAR SIDE SQUIB LH CIRCUIT) Click here

    OK

    REPLACE REAR SEAT ASSEMBLY LH

  3. CHECK NO. 2 FLOOR WIRE (REAR SIDE SQUIB LH CIRCUIT)


    1. A01NDQEE02
      Text in Illustration
      *1 Rear Side Squib LH
      *2 Center Airbag Sensor Assembly
      *3 No. 2 Floor Wire
      *4

      Front view of wire harness connector

      (to Rear Seat Side Airbag Assembly LH)
      *5 Connector C

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      Note

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Disconnect SST from connector C.

    4. Disconnect the No. 2 floor wire from the center airbag sensor assembly.

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


      1. Connect the cable to the negative (-) battery terminal.

      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
        P16-1 (SRL+) - Body ground Power switch on (IG) Below 1 V
        P16-2 (SRL-) - Body ground Power switch on (IG) Below 1 V

    6. Check for an open in the circuit.


      1. Turn the power switch off.

      2. Disconnect the cable from the negative (-) battery terminal.

        Note

        Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        P16-1 (SRL+) - P16-2 (SRL-) Always Below 1 Ω

    7. 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
        P16-1 (SRL+) - P16-2 (SRL-) Always 1 MΩ or higher
        P16-1 (SRL+) - Body ground Always 1 MΩ or higher
        P16-2 (SRL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


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

    2. A01NFEHE01
      Text in Illustration
      *1 Rear Side Squib LH
      *2 Center Airbag Sensor Assembly

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

    3. Connect the cable to the negative (-) battery terminal.

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

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

    6. Turn the power switch off.

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

    8. Check for DTCs Click here.

      OK
      DTC B1855, B1856, B1857, B1858 or 63 is not output.

      Tech Tips

      Codes other than DTC B1855, B1856, B1857, B1858 and 63 may be output at this time, but they are not related to this check.


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here