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AIRBAG SYSTEM, Diagnostic DTC:B1623

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DTC Code DTC Name
B1623 Side Airbag Sensor Assembly Initialization Error (RH)
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DESCRIPTION

The circuit for the side collision sensor RH is composed of the airbag ECU assembly, door side airbag sensor RH, side airbag sensor assembly RH and rear airbag sensor RH.

The side airbag sensor assembly RH detect impacts to the vehicle and send signals to the airbag ECU assembly to determine if the airbag should be deployed.

DTC B1623 is stored when a malfunction is detected in the circuit for the side collision sensor RH.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1623 Side Airbag Sensor Assembly Initialization Error (RH)

One of the following conditions is met:


  • The airbag ECU assembly 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 side collision sensor RH for 2 seconds.

  • A side airbag sensor assembly RH malfunction.

  • An airbag ECU assembly malfunction.

  • Floor wire

  • Side airbag sensor assembly RH

  • Airbag ECU assembly

 Comes on Not applicable
Table 1. *a Rear Airbag Sensor RH *b Door Side Airbag Sensor RH *c Side Airbag Sensor Assembly RH *d 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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PROCEDURE


  1. Click here

    CHECK PAST DTC


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

    2. Check for DTCs.

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      1. Body Electrical > SRS Airbag > Trouble Codes


      Result
      Proceed to
      DTC B1622 is not output
      DTC B1622 is output

  2. Click here

    CHECK DTC


    1. Turn the power 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 power switch off and then on (IG) again.

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

    3. Check for DTCs.

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      1. Body Electrical > SRS Airbag > Trouble Codes


      Result
      Proceed to
      DTC B1623 is output
      DTC B1623 is not output
      Tip:

      Codes other than DTC B1623 may be output at this time, but they are not related to this check.


  3. Click here

    CHECK CONNECTION OF CONNECTORS


    1. 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 airbag sensor RH and side airbag sensor assembly RH.

      Result
      Proceed to
      The connectors are properly connected
      The connectors are not properly connected

    • The connectors are properly connectedClick here
    • The connectors are not properly connected

      CONNECT CONNECTORS PROPERLY

  4. Click here

    CHECK CONNECTORS


    1. Disconnect the connectors from the rear airbag sensor RH and side airbag sensor assembly RH.

    2. B004TVCC02
      *1 Side Airbag Sensor Assembly RH
      *2 Rear Airbag Sensor RH
      *3 Floor Wire

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

      Result
      Proceed to
      The connectors are not deformed or damaged
      The connectors are deformed or damaged

    • The connectors are not deformed or damagedClick here
    • The connectors are deformed or damaged

      REPLACE FLOOR WIRE

  5. Click here

    CHECK FLOOR WIRE


    1. B004XT1C05
      *1 Side Airbag Sensor Assembly RH
      *2 Rear Airbag Sensor RH
      *3 Floor Wire
      *4 Service Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)
      *b

      Front view of wire harness connector

      (to Rear Airbag Sensor RH)

      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
      L39-3 (BBR-) - Body ground Power switch on (IG) Below 1 V
      L39-4 (BBR+) - 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.

    6. Using a service wire, connect terminals 1 (BBR+) and 2 (BBR-) of connector B.

      Note:

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L39-3 (BBR-) - L39-4 (BBR+) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L39-3 (BBR-) - L39-4 (BBR+) Always 1 MΩ or higher
      L39-3 (BBR-) - Body ground Always 1 MΩ or higher
      L39-4 (BBR+) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

  6. Click here

    CHECK SIDE AIRBAG SENSOR ASSEMBLY RH


    1. B004VAHC09
      *1 Side Airbag Sensor Assembly LH
      *2 Rear Airbag Sensor RH

      Connect the connector to the rear airbag sensor RH.

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

    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 stored.

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      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 B1628 is output
      DTC B1623 is output
      DTC B1623 and B1628 are not output
      Tip:

      Codes other than DTC B1623 and B1628 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. Return the side airbag sensor assembly LH and RH to their original positions and connect the connectors to them.


    • DTC B1628 is output

      REPLACE SIDE AIRBAG SENSOR ASSEMBLY RHClick here

    • DTC B1623 is outputClick here
    • DTC B1623 and B1628 are not output

      USE SIMULATION METHOD TO CHECKClick here

  7. Click here

    CHECK DTC


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

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

    3. Clear the DTCs.

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      1. Body Electrical > SRS Airbag > Clear DTCs


    4. Turn the power switch off.

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

    6. Check for DTCs.

      Click here


      1. Body Electrical > SRS Airbag > Trouble Codes


      Result
      Proceed to
      DTC B1623 is output
      DTC B1623 is not output
      Tip:

      Codes other than DTC B1623 may be output at this time, but they are not related to this check.


    • DTC B1623 is output

      REPLACE AIRBAG ECU ASSEMBLYClick here

    • DTC B1623 is not output

      USE SIMULATION METHOD TO CHECKClick here