AIRBAG SYSTEM, Diagnostic DTC:B1800/51,B1801/51,B1802/51 and B1803/51

DTC Code DTC Name
B1800/51 Short in Driver Side Squib Circuit
B1801/51 Open in Driver Side Squib Circuit
B1802/51 Short to GND in Driver Side Squib Circuit
B1803/51 Short to B+ in Driver Side Squib Circuit

DESCRIPTION

  • The driver side squib circuit consists of the center airbag sensor, spiral cable and steering pad.

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

  • These DTCs are stored when a malfunction is detected in the driver side squib circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Test Mode / Check Mode

B1800/51

Short in Driver Side Squib Circuit

One of the following conditions is met:

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

  • A driver side squib malfunction.

  • A spiral cable malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • Spiral cable sub-assembly

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly

*2

B1801/51

Open in Driver Side Squib Circuit

One of the following conditions is met:

  • The center airbag sensor detects an open circuit signal in the driver side squib circuit for 2 seconds.

  • A driver side squib malfunction.

  • A spiral cable malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • Spiral cable sub-assembly

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly

*2

B1802/51

Short to GND in Driver Side Squib Circuit

One of the following conditions is met:

  • The center airbag sensor detects a short circuit to ground signal in the driver side squib circuit for 0.5 seconds.

  • A driver side squib malfunction.

  • A spiral cable malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • Spiral cable sub-assembly

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly

*2

B1803/51

Short to B+ in Driver Side Squib Circuit

One of the following conditions is met:

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

  • A driver side squib malfunction.

  • A spiral cable malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • Spiral cable sub-assembly

  • Steering pad (Driver side squib)

  • Center airbag sensor assembly

*2

WIRING DIAGRAM

C180430E24

CAUTION / NOTICE / HINT

Note:

  • When installing the spiral cable and steering wheel, be sure to adjust the spiral cable as it may break if the steering wheel is turned before adjusting the spiral cable (Click here).

  • 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 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).

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 STEERING PAD (DRIVER SIDE SQUIB)

    1. C213939C03

      *1

      Driver Side Squib

      *2

      Spiral Cable

      *3

      Center Airbag Sensor

      *4

      Connector E

      *5

      SST

      *a

      Front view of wire harness connector

      (to Driver Side Squib)

      *b

      Color: Orange

      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 steering pad.

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

      CAUTION:

      Never connect the tester to the steering pad (driver side squib) 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 B1800, B1801, B1802 or B1803 is not output.

      Tip:

      Codes other than DTC B1800, B1801, B1802 and B1803 may be output at this time, but they are not related to this check.

      Result

      Result

      OK

      NG

    09843-18061

    OK

    REPLACE STEERING PAD

    Click here

    NG

  2. CHECK CONNECTOR

    1. C214772C02

      *1

      Driver Side Squib

      *2

      Spiral Cable

      *3

      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 E.

    4. Check that the spiral cable connectors (on the steering pad 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 SPIRAL CABLE SUB-ASSEMBLY

    Click here

    OK

  3. CHECK DRIVER SIDE SQUIB CIRCUIT

    1. C213940C03

      *1

      Driver Side Squib

      *2

      Spiral Cable

      *3

      Center Airbag Sensor

      *4

      Connector E

      *a

      Front view of wire harness connector

      (to Driver Side Squib)

      *b

      Color: Orange

      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

      z5-2 (D+) - Body ground

      Engine switch on (IG)

      Below 1 V

      z5-1 (D-) - 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

      z5-2 (D+) - z5-1 (D-)

      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

      z5-2 (D+) - z5-1 (D-)

      Always

      1 MΩ or higher

      z5-2 (D+) - Body ground

      Always

      1 MΩ or higher

      z5-1 (D-) - Body ground

      Always

      1 MΩ or higher

      Result

      Result

      OK

      NG
    NG

    CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - SPIRAL CABLE)Click here

    OK

  4. CHECK CENTER AIRBAG SENSOR

    1. C146246C02

      *1

      Driver Side Squib

      *2

      Spiral Cable

      *3

      Center Airbag Sensor

      Connect the connectors to the steering pad 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. Clear the DTCs.

      Click here

      Body Electrical > SRS Airbag > Trouble Codes

      OK

      DTC B1800, B1801, B1802 or B1803 is not output.

      Tip:

      Codes other than DTC B1800, B1801, B1802 and B1803 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

  5. CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - SPIRAL CABLE)

    1. C213941C03

      *1

      Instrument Panel Wire

      *2

      Spiral Cable

      *3

      Center Airbag Sensor

      *4

      Connector C

      *a

      Rear view of wire harness connector

      (to Spiral Cable)

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

    2. Disconnect the instrument panel wire connector from the spiral cable.

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

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      G29-1 (D+) - Body ground

      Engine switch on (IG)

      Below 1 V

      G29-2 (D-) - Body ground

      Engine switch on (IG)

      Below 1 V

    5. Turn the engine switch off.

    6. Disconnect the cable from the negative (-) battery terminal, 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

      G29-1 (D+) - G29-2 (D-)

      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

      G29-1 (D+) - G29-2 (D-)

      Always

      1 MΩ or higher

      G29-1 (D+) - Body ground

      Always

      1 MΩ or higher

      G29-2 (D-) - Body ground

      Always

      1 MΩ or higher

      Result

      Result

      OK

      NG
    OK

    REPLACE SPIRAL CABLE SUB-ASSEMBLY

    Click here

    NG

    REPLACE INSTRUMENT PANEL WIRE