AIRBAG SYSTEM, Diagnostic DTC:B1633/81 and B1638/82

DTC Code DTC Name
B1633/81 Rear Airbag Sensor Assembly RH Initialization Incomplete
B1638/82 Rear Airbag Sensor Assembly LH Initialization Incomplete

DESCRIPTION

The circuit for the side collision sensor LH or RH (to determine deployment of the front seat airbag LH or RH and curtain shield airbag LH or RH) is composed of the center airbag sensor, side airbag sensor LH or RH and rear airbag sensor LH or RH.

The rear airbag sensor LH or RH detect impacts to the vehicle and send signals to the center airbag sensor to determine if the airbag should be deployed.

DTC B1633 or B1638 is stored when a malfunction is detected in the circuit for the rear collision sensor LH or RH (to determine deployment of the curtain shield airbag LH or RH).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Test Mode / Check Mode

B1633/81

Rear Airbag Sensor Assembly RH Initialization Incomplete

One of the following conditions is met:

  • The center airbag sensor detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the rear collision sensor RH (to determine deployment of the curtain shield airbag RH) for 2 seconds.

  • A rear airbag sensor RH malfunction.

  • A side airbag sensor RH malfunction.

  • A center airbag sensor malfunction.

  • Floor wire

  • Rear airbag sensor RH

  • Side airbag sensor assembly RH

  • Center airbag sensor assembly

*1

B1638/82

Rear Airbag Sensor Assembly LH Initialization Incomplete

One of the following conditions is met:

  • The center airbag sensor detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the rear collision sensor LH (to determine deployment of the curtain shield airbag LH) for 2 seconds.

  • A rear airbag sensor LH malfunction.

  • A side airbag sensor LH malfunction.

  • A center airbag sensor malfunction.

  • No. 2 floor wire

  • Rear airbag sensor LH

  • Side airbag sensor assembly LH

  • Center airbag sensor assembly

*1

WIRING DIAGRAM

C175145E13
C175145E14

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 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).

PROCEDURE

  1. CHECK FOR DTC

    1. Turn the engine switch off.

      Tip:

      If a communication error occurs, DTCs for both the LH and RH sides will be stored simultaneously. The malfunctioning area can be identified by turning the engine switch off and then on (IG) again.

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

    3. Check for DTCs.

      Click here

      Body Electrical > SRS Airbag > Trouble Codes

      Result

      Result

      Proceed to

      DTC B1633 and B1638 are not output

      A

      DTC B1638 is output

      B

      DTC B1633 is output

      C

      Tip:

      Codes other than DTC B1633 and B1638 may be output at this time, but they are not related to this check.

    B

    CHECK CONNECTION OF CONNECTORSClick here

    A

    USE SIMULATION METHOD TO CHECK

    C
  2. CHECK CONNECTION OF CONNECTORS

    1. Turn the engine switch off.

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

    3. Check that the connectors are properly connected to the center airbag sensor and rear airbag sensor RH.

      OK

      The connectors are properly connected.

      Result

      Result

      OK

      NG

    NG

    CONNECT CONNECTORS PROPERLY

    OK
  3. CHECK CONNECTORS

    1. C208245C03

      *1

      Rear Airbag Sensor RH

      *2

      Center Airbag Sensor

      Disconnect the connectors from the center airbag sensor and rear airbag sensor RH.

    2. Check that the connectors (on the center airbag sensor side and rear airbag sensor RH side) are not damaged.

      OK

      The connectors are not deformed or damaged.

      Result

      Result

      OK

      NG

    NG

    REPLACE FLOOR WIRE

    OK
  4. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - REAR AIRBAG SENSOR RH)

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

      C213919C02

      *1

      Rear Airbag Sensor RH

      *2

      Center Airbag Sensor

      *3

      Floor Wire

      *4

      Connector C

      *5

      Connector B

      *6

      Service Wire

      *a

      Rear view of wire harness connector

      (to Rear Airbag Sensor RH)

      *b

      Rear view of wire harness connector

      (to Center Airbag Sensor)

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      Q4-4 (BBR+) - Body ground

      Engine switch on (IG)

      Below 1 V

      Q4-3 (BBR-) - Body ground

      Engine switch on (IG)

      Below 1 V

    3. Turn the engine switch off.

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

    5. Using a service wire, connect terminals 17 (BBR+) and 18 (BBR-) of connector B.

      Note:

      Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Q4-4 (BBR+) - Q4-3 (BBR-)

      Always

      Below 1 Ω

    7. Disconnect the service wire from connector B.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Q4-4 (BBR+) - Q4-3 (BBR-)

      Always

      1 MΩ or higher

      Q4-4 (BBR+) - Body ground

      Always

      1 MΩ or higher

      Q4-3 (BBR-) - Body ground

      Always

      1 MΩ or higher

      Result

      Result

      OK

      NG

    NG

    REPLACE FLOOR WIRE

    OK
  5. CHECK REAR AIRBAG SENSOR RH

    1. C171812C09

      *1

      Rear Airbag Sensor LH

      *2

      Center Airbag Sensor

      Connect the connector to the center airbag sensor.

    2. Interchange the rear airbag sensor LH with RH and connect the connectors to them.

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

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

    5. Clear the DTCs stored in memory.

      Click here

      Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the engine switch off.

    7. Turn the engine switch on (IG), and wait for at least 90 seconds.

    8. Check for DTCs.

      Click here

      Body Electrical > SRS Airbag > Trouble Codes

      Result

      Result

      Proceed to

      DTC B1633 and B1638 are not output

      A

      DTC B1638 is output

      B

      DTC B1633 is output

      C

      Tip:

      Codes other than DTC B1633 and B1638 may be output at this time, but they are not related to this check.

    9. Turn the engine switch off.

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

    11. Return the rear airbag sensor LH and RH to their original positions and connect the connectors to them.

    A

    USE SIMULATION METHOD TO CHECK

    B

    REPLACE REAR AIRBAG SENSOR RH

    C
  6. CHECK SIDE AIRBAG SENSOR RH

    1. C171828C05

      *1

      Side Airbag Sensor LH

      *2

      Rear Airbag Sensor RH

      Interchange the side airbag sensor LH with RH and connect the connectors to them.

    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 stored in memory.

      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 90 seconds.

    7. Check for DTCs.

      Click here

      Body Electrical > SRS Airbag > Trouble Codes

      Result

      Result

      Proceed to

      DTC B1633 and B1638 are not output

      A

      DTC B1638 is output

      B

      DTC B1633 is output

      C

      Tip:

      Codes other than DTC B1633 and B1638 may be output at this time, but they are not related to this check.

    8. Turn the engine switch off.

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

    10. Return the side airbag sensor LH and RH to their original positions and connect the connectors to them.

    A

    USE SIMULATION METHOD TO CHECK

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

  7. CHECK CONNECTION OF CONNECTORS

    1. Turn the engine switch off.

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

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

      OK

      The connectors are properly connected.

      Result

      Result

      OK

      NG

    NG

    CONNECT CONNECTORS PROPERLY

    OK
  8. CHECK CONNECTORS

    1. C208244C04

      *1

      Rear Airbag Sensor LH

      *2

      Center Airbag Sensor

      Disconnect the connectors from the center airbag sensor and rear airbag sensor LH.

    2. Check that the connectors (on the center airbag sensor side and rear airbag sensor LH side) are not damaged.

      OK

      The connectors are not deformed or damaged.

      Result

      Result

      OK

      NG

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK
  9. CHECK FLOOR WIRE NO.2 (CENTER AIRBAG SENSOR - REAR AIRBAG SENSOR LH)

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

      C213920C02

      *1

      Rear Airbag Sensor LH

      *2

      Center Airbag Sensor

      *3

      No. 2 Floor Wire

      *4

      Connector C

      *5

      Connector B

      *6

      Service Wire

      *a

      Rear view of wire harness connector

      (to Rear Airbag Sensor LH)

      *b

      Rear view of wire harness connector

      (to Center Airbag Sensor)

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      R6-4 (BBL+) - Body ground

      Engine switch on (IG)

      Below 1 V

      R6-3 (BBL-) - Body ground

      Engine switch on (IG)

      Below 1 V

    3. Turn the engine switch off.

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

    5. Using a service wire, connect terminals 24 (BBL+) and 23 (BBL-) of connector B.

      Note:

      Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      R6-4 (BBL+) - R6-3 (BBL-)

      Always

      Below 1 Ω

    7. Disconnect the service wire from connector B.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      R6-4 (BBL+) - R6-3 (BBL-)

      Always

      1 MΩ or higher

      R6-4 (BBL+) - Body ground

      Always

      1 MΩ or higher

      R6-3 (BBL-) - Body ground

      Always

      1 MΩ or higher

      Result

      Result

      OK

      NG

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK
  10. CHECK REAR AIRBAG SENSOR LH

    1. C146229C06

      *1

      Rear Airbag Sensor RH

      *2

      Center Airbag Sensor

      Connect the connector to the center airbag sensor.

    2. Interchange the rear airbag sensor LH with RH and connect the connectors to them.

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

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

    5. Clear the DTCs stored in memory.

      Click here

      Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the engine switch off.

    7. Turn the engine switch on (IG), and wait for at least 90 seconds.

    8. Check for DTCs.

      Click here

      Body Electrical > SRS Airbag > Trouble Codes

      Result

      Result

      Proceed to

      DTC B1633 and B1638 are not output

      A

      DTC B1638 is output

      B

      DTC B1633 is output

      C

      Tip:

      Codes other than DTC B1633 and B1638 may be output at this time, but they are not related to this check.

    9. Turn the engine switch off.

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

    11. Return the rear airbag sensor RH and LH to their original positions and connect the connectors to them.

    A

    USE SIMULATION METHOD TO CHECK

    B

    REPLACE REAR AIRBAG SENSOR LH

    C
  11. CHECK SIDE AIRBAG SENSOR LH

    1. C171828C06

      *1

      Side Airbag Sensor RH

      *2

      Rear Airbag Sensor LH

      Interchange the side airbag sensor LH with RH and connect the connectors to them.

    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 stored in memory.

      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 90 seconds.

    7. Check for DTCs.

      Click here

      Body Electrical > SRS Airbag > Trouble Codes

      Result

      Result

      Proceed to

      DTC B1633 and B1638 are not output

      A

      DTC B1633 is output

      B

      DTC B1638 is output

      C

      Tip:

      Codes other than DTC B1633 and B1638 may be output at this time, but they are not related to this check.

    8. Turn the engine switch off.

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

    10. Return the side airbag sensor RH and LH to their original positions and connect the connectors to them.

    A

    USE SIMULATION METHOD TO CHECK

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY