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Home >> Subaru >> 2022 >> WRX Premium, Standard Trans >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Air Bag System (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC B1643: Side Satellite Sensor Bus RH Initialization Error

DTC B1643: Side Satellite Sensor Bus RH Initialization Error

Diagnosis start condition: 

When the ignition voltage is 10 - 16 V.

DTC detecting condition: 

Wiring diagram: 

Airbag system Ref. to WIRING SYSTEM>AIRBAG SYSTEM>WIRING DIAGRAM

G14614912Courtesy of SUBARU OF AMERICA, INC.
CAUTION:

Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to  AIRBAG (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION  

  1. CHECK DTC  .

    Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

    Is DTC B1622 or B1623 displayed? (Current code)

    Yes  : Perform the diagnosis for the displayed DTC B1622 or B1623. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1622 SIDE AIRBAG SENSOR RH LOST COMMUNICATION  Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1623 SIDE AIRBAG SENSOR RH INITIALIZATION ERROR 

    No  : Go to  2.

  2. CHECK DTC  .

    Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

    Is DTC B1632 or B1633 displayed? (Current code)

    Yes  : Perform the diagnosis for the displayed DTC B1632 or B1633. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1632 CURTAIN AIRBAG SENSOR RH LOST COMMUNICATION  Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1633 CURTAIN AIRBAG SENSOR RH INITIALIZATION ERROR 

    No  : Go to  3.

  3. CHECK DTC  .

    Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

    Is DTC B1692 or B1693 displayed? (Current code)

    Yes  : Perform the diagnosis for the displayed DTC B1692 or B1693. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1692 LOST COMMUNICATION WITH DOOR SENSOR RH  Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1693 DOOR SENSOR RH INITIALIZATION INCOMPLETE 

    No  : Go to  4.

  4. CHECK POOR CONTACT OF CONNECTORS  .

    Check for poor contact of the connectors between the airbag control module and Side impact sensor RH (front door).

    Is there poor contact?

    Yes  : Replace the airbag rear harness and the door harness.

    No  : Go to  5.

  5. CHECK AIRBAG REAR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND Side impact sensor RH (center pillar)) (SHORTED TO GROUND AND SHORTED BETWEEN LINES)  .
    1. Turn the ignition switch to OFF, and wait for 60 seconds or more after disconnecting the ground terminal from the battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY
    2. Disconnect the connector (AB93) from seat belt pretensioner RH.
    3. Disconnect the connector (AB95) from the lap seat belt pretensioner RH.
    4. Disconnect the connector (AB99) from Rear seatbelt pretensioner RH.
    5. Disconnect the connector (AB87) from side airbag module RH.
    6. Disconnect the connector (AB91) from curtain airbag module RH.
    7. Disconnect the connectors (AB41, AB42, AB43) from airbag control module.
    8. Connect the connector (1BF) in the test harness BF to the connectors (AB41, AB42, AB43).
    9. Disconnect the connector (AB55) from Side impact sensor RH (center pillar).
    10. Measure the resistance between connector (4BF) in the test harness BF and chassis ground, and the resistance between connector (4BF) terminals in the test harness BF.

      Connector & terminal 

      (4BF) No. 1 - Chassis ground:

      (4BF) No. 5 - Chassis ground:

      (4BF) No. 1 - (4BF) No. 5:

    Is the resistance 1 MΩ or more?

    Yes  : Go to  6.

    No  : Replace the airbag rear harness along with body harness.

  6. CHECK AIRBAG REAR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND Side impact sensor RH (center pillar)) (SHORT CIRCUIT TO POWER SUPPLY)  .
    1. Install the ground terminal to the battery sensor and turn the ignition switch to ON. Ref. to REPAIR CONTENTS>NOTE>BATTERY
    2. Measure the voltage between connector (4BF) in the test harness BF and chassis ground.

      Connector & terminal 

      (4BF) No. 1 (+) - Chassis ground (-):

      (4BF) No. 5 (+) - Chassis ground (-):

    Is the voltage less than 1 V?

    Yes  : Go to  7.

    No  : Replace the airbag rear harness along with body harness.

  7. CHECK AIRBAG REAR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND Side impact sensor RH (rear wheel house)) (SHORTED TO GROUND AND SHORTED BETWEEN LINES)  .
    1. Turn the ignition switch to OFF, and wait for 60 seconds or more after disconnecting the ground terminal from the battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY
    2. Disconnect the connector (AB57) from Side impact sensor RH (rear wheel house).
    3. Measure the resistance between connector (4BF) in the test harness BF and chassis ground, and the resistance between connector (4BF) terminals in the test harness BF.

      Connector & terminal 

      (4BF) No. 6 - Chassis ground:

      (4BF) No. 2 - Chassis ground:

      (4BF) No. 6 - (4BF) No. 2:

    Is the resistance 1 MΩ or more?

    Yes  : Go to  8.

    No  : Replace the airbag rear harness along with body harness.

  8. CHECK AIRBAG REAR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND Side impact sensor RH (rear wheel house)) (SHORT CIRCUIT TO POWER SUPPLY)  .
    1. Install the ground terminal to the battery sensor and turn the ignition switch to ON. Ref. to REPAIR CONTENTS>NOTE>BATTERY
    2. Measure the voltage between connector (4BF) in the test harness BF and chassis ground.

      Connector & terminal 

      (4BF) No. 6 (+) - Chassis ground (-):

      (4BF) No. 2 (+) - Chassis ground (-):

    Is the voltage less than 1 V?

    Yes  : Go to  9.

    No  : Replace the airbag rear harness along with body harness.

  9. CHECK AIRBAG REAR HARNESS AND DOOR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND Side impact sensor RH (front door)) (SHORTED TO GROUND AND SHORTED BETWEEN LINES)  .
    1. Turn the ignition switch to OFF, and wait for 60 seconds or more after disconnecting the ground terminal from the battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY
    2. Disconnect the connector (AB61) from Side impact sensor RH (front door).
    3. Measure the resistance between connector (4BF) in the test harness BF and chassis ground, and the resistance between connector (4BF) terminals in the test harness BF.

      Connector & terminal 

      (4BF) No. 7 - Chassis ground:

      (4BF) No. 3 - Chassis ground:

      (4BF) No. 7 - (4BF) No. 3:

    Is the resistance 1 MΩ or more?

    Yes  : Go to  10.

    No  : Check the door harness, and if any fault is found, replace the harness. If there is no fault, replace the airbag rear harness together with body harness.

  10. CHECK AIRBAG REAR HARNESS AND DOOR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND Side impact sensor RH (front door)) (SHORT CIRCUIT TO POWER SUPPLY)  .
    1. Install the ground terminal to the battery sensor and turn the ignition switch to ON. Ref. to REPAIR CONTENTS>NOTE>BATTERY
    2. Measure the voltage between connector (4BF) in the test harness BF and chassis ground.

      Connector & terminal 

      (4BF) No. 7 (+) - Chassis ground (-):

      (4BF) No. 3 (+) - Chassis ground (-):

    Is the voltage less than 1 V?

    Yes  : Go to  11.

    No  : Check the door harness, and if any fault is found, replace the harness. If there is no fault, replace the airbag rear harness together with body harness.

  11. CHECK AIRBAG CONTROL MODULE  .
    1. Connect all connectors.
    2. Using the Subaru Select Monitor, perform the clear memory of [Airbag]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY
    3. Execute the inspection mode. Ref. to AIRBAG (DIAGNOSTICS)>INSPECTION MODE 
    4. Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

    Is DTC B1643 displayed? (Current code)

    Yes  : Go to  12.

    No  : Finish the diagnosis.

  12. REPLACE Side impact sensor RH (center pillar) AND CHECK AIRBAG CONTROL MODULE AFTER REPLACEMENT  .
    1. Turn the ignition switch to OFF, and wait for 60 seconds or more after disconnecting the ground terminal from the battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY
    2. Replace Side impact sensor RH (center pillar). Ref. to AIRBAG SYSTEM>IMPACT SENSOR>REMOVAL
    3. Connect all connectors.
    4. Using the Subaru Select Monitor, perform the clear memory of [Airbag]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY
    5. Execute the inspection mode. Ref. to AIRBAG (DIAGNOSTICS)>INSPECTION MODE 
    6. Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

    Is DTC B1643 displayed? (Current code)

    Yes  : Go to  13.

    No  : Finish the diagnosis.

  13. REPLACE Side impact sensor RH (rear wheel house) AND CHECK AIRBAG CONTROL MODULE AFTER REPLACEMENT  .
    1. Turn the ignition switch to OFF, and wait for 60 seconds or more after disconnecting the ground terminal from the battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY
    2. Replace Side impact sensor RH (rear wheel house). Ref. to AIRBAG SYSTEM>IMPACT SENSOR>REMOVAL
    3. Connect all connectors.
    4. Using the Subaru Select Monitor, perform the clear memory of [Airbag]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY
    5. Execute the inspection mode. Ref. to AIRBAG (DIAGNOSTICS)>INSPECTION MODE 
    6. Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

    Is DTC B1643 displayed? (Current code)

    Yes  : Go to  14.

    No  : Finish the diagnosis.

  14. REPLACE Side impact sensor RH (front door) AND CHECK AIRBAG CONTROL MODULE AFTER REPLACEMENT  .
    1. Turn the ignition switch to OFF, and wait for 60 seconds or more after disconnecting the ground terminal from the battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY
    2. Replace Side impact sensor RH (front door). Ref. to AIRBAG SYSTEM>IMPACT SENSOR>REMOVAL
    3. Connect all connectors.
    4. Using the Subaru Select Monitor, perform the clear memory of [Airbag]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY
    5. Execute the inspection mode. Ref. to AIRBAG (DIAGNOSTICS)>INSPECTION MODE 
    6. Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

    Is DTC B1643 displayed? (Current code)

    Yes  : Replace the airbag control module. Ref. to AIRBAG SYSTEM>AIRBAG CONTROL MODULE>REMOVAL

    No  : Finish the diagnosis.

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