AIRBAG SYSTEM, Diagnostic DTC:B1835/58,B1836/58,B1837/58 and B1838/58

DTC Code DTC Name
B1835/58 Short in Curtain Shield Squib LH Circuit
B1836/58 Open in Curtain Shield Squib LH Circuit
B1837/58 Short to GND in Curtain Shield Squib LH Circuit
B1838/58 Short to B+ in Curtain Shield Squib LH Circuit

DESCRIPTION

The curtain shield squib LH circuit consists of the center airbag sensor and curtain shield airbag LH.

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

These DTCs are stored when a malfunction is detected in the curtain shield squib LH circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Test Mode / Check Mode

B1835/58

Short in Curtain Shield Squib LH Circuit

One of the following conditions is met:

  • The center airbag sensor detects a line short circuit signal 5 times in the curtain shield squib LH circuit during the primary check.

  • A curtain shield squib LH malfunction.

  • A center airbag sensor malfunction.

  • No. 2 floor wire

  • Curtain shield airbag assembly LH (Curtain shield squib LH)

  • Center airbag sensor assembly

*2

B1836/58

Open in Curtain Shield Squib LH Circuit

One of the following conditions is met:

  • The center airbag sensor detects an open circuit signal in the curtain shield squib LH circuit for 2 seconds.

  • A curtain shield squib LH malfunction.

  • A center airbag sensor malfunction.

  • No. 2 floor wire

  • Curtain shield airbag assembly LH (Curtain shield squib LH)

  • Center airbag sensor assembly

*2

B1837/58

Short to GND in Curtain Shield Squib LH Circuit

One of the following conditions is met:

  • The center airbag sensor detects a short circuit to ground signal in the curtain shield squib LH circuit for 0.5 seconds.

  • A curtain shield squib LH malfunction.

  • A center airbag sensor malfunction.

  • No. 2 floor wire

  • Curtain shield airbag assembly LH (Curtain shield squib LH)

  • Center airbag sensor assembly

*2

B1838/58

Short to B+ in Curtain Shield Squib LH Circuit

One of the following conditions is met:

  • The center airbag sensor detects a short circuit to B+ signal in the curtain shield squib LH circuit for 0.5 seconds.

  • A curtain shield squib LH malfunction.

  • A center airbag sensor malfunction.

  • No. 2 floor wire

  • Curtain shield airbag assembly LH (Curtain shield squib LH)

  • Center airbag sensor assembly

*2

WIRING DIAGRAM

C253326E13

CAUTION / NOTICE / HINT

Note:

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

Tip:

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

PROCEDURE

  1. CHECK CURTAIN SHIELD AIRBAG LH (CURTAIN SHIELD SQUIB LH)

    1. C219650C03

      *1

      Curtain Shield Squib LH

      *2

      Center Airbag Sensor

      *3

      Connector C

      *4

      SST

      *a

      Front view of wire harness connector

      (to Curtain Shield Squib LH)

      Turn the engine switch off.

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

    3. Disconnect the connectors from the curtain shield airbag LH.

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

      CAUTION:

      Never connect the tester to the curtain shield airbag LH (curtain shield 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.

    5. Connect the cable to the negative (-) battery terminal, 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

      Body Electrical > SRS Airbag > Clear DTCs

    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

      Body Electrical > SRS Airbag > Trouble Codes

      OK

      DTC B1835, B1836, B1837 or B1838 is not output.

      Tip:

      Codes other than DTC B1835, B1836, B1837 and B1838 may be output at this time, but they are not related to this check.

      Result

      Result

      OK

      NG

    09843-18061

    OK

    REPLACE CURTAIN SHIELD AIRBAG ASSEMBLY LH

    Click here

    NG

  2. CHECK CONNECTOR

    1. C214774C04

      *1

      Curtain Shield Squib LH

      *2

      Center Airbag Sensor

      Turn the engine switch off.

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

    3. Disconnect SST from connector C.

    4. Check that the No. 2 floor wire connectors (on the curtain shield airbag LH side) are not damaged.

      OK

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

      Result

      Result

      OK

      NG
    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  3. CHECK NO. 2 FLOOR WIRE (CURTAIN SHIELD AIRBAG LH CIRCUIT)

    1. C219651C03

      *1

      Curtain Shield Squib LH

      *2

      No. 2 Floor Wire

      *3

      Center Airbag Sensor

      *4

      Connector C

      *a

      Front view of wire harness connector

      (to Curtain Shield Squib LH)

      Disconnect the connectors from the center airbag sensor.

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

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      R7-1 (ICL+) - Body ground

      Engine switch on (IG)

      Below 1 V

      R7-2 (ICL-) - Body ground

      Engine switch on (IG)

      Below 1 V

    4. Turn the engine switch off.

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

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      R7-1 (ICL+) - R7-2 (ICL-)

      Always

      Below 1 Ω

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

      Click here

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      R7-1 (ICL+) - R7-2 (ICL-)

      Always

      1 MΩ or higher

      R7-1 (ICL+) - Body ground

      Always

      1 MΩ or higher

      R7-2 (ICL-) - Body ground

      Always

      1 MΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  4. CHECK CENTER AIRBAG SENSOR

    1. C146259C04

      *1

      Curtain Shield Squib LH

      *2

      Center Airbag Sensor

      Connect the connectors to the curtain shield airbag LH and center airbag sensor.

    2. Connect the cable to the negative (-) battery terminal, 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

      Body Electrical > SRS Airbag > Clear DTCs

    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

      Body Electrical > SRS Airbag > Trouble Codes

      OK

      DTC B1835, B1836, B1837 or B1838 is not output.

      Tip:

      Codes other than DTC B1835, B1836, B1837 and B1838 may be output at this time, but they are not related to this check.

      Result

      Result

      OK

      NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

    Click here