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Home >> Subaru >> 2020 >> Crosstrek Base, Automatic CVT 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 (IMPREZA MODEL)>AIRBAG SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>AIRBAG SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>AIRBAG SYSTEM>WIRING DIAGRAM .

G11256515Courtesy of SUBARU OF AMERICA, INC.
CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to AIR BAG (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 malfunction)

    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 malfunction)

    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 malfunction)

    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 the front door impact sensor RH.

    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 AIRBAG SENSOR RH)  .
    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>REPAIR CONTENTS>NOTE>BATTERY .
      NOTE: For the hybrid model, turn the ignition switch to OFF, and wait for 60 seconds or more after disconnecting the ground terminal from the battery.
    2. Disconnect the connector (AB26) from seat belt pretensioner RH.
    3. Disconnect the connector (AB30) from the lap seat belt pretensioner RH.
    4. Disconnect the connector (AB33) from curtain airbag module RH.
    5. Disconnect the connector (AB24) of side airbag module RH.
    6. Disconnect the connectors (AB6, AB17, AB18) from airbag control module.
    7. Connect the connector (1AG) in the test harness AG to the connectors (AB6, AB17, AB18).
    8. Disconnect the connector (AB28) from side airbag sensor RH.
    9. Connect the connector (2V) in the test harness V to the connector (AB28).
    10. Measure the resistance between connector (3V) in test harness V and chassis ground, and the resistance between connector (3V) terminals.

      Connector & terminal 

      (3V) No. 1 - Chassis ground:

      (3V) No. 2 - Chassis ground:

      (3V) No. 1 - (3V) No. 2:

    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 AIRBAG SENSOR RH)  .

    Measure the voltage between connector (3V) in the test harness V and chassis ground.

    Connector & terminal 

    (3V) No. 1 (+) - Chassis ground (-):

    (3V) No. 2 (+) - 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 SIDE AIRBAG SENSOR AND CURTAIN AIRBAG SENSOR RH)  .
    1. Disconnect the connector (2V) in the test harness V from the connector (AB28) of side airbag sensor RH.
    2. Connect the connector (AB28) of side airbag sensor RH and the connector (1AI) in the test harness AI.
    3. Connect the connector (2AI) in the test harness AI and the connector (1V) in the test harness V.
    4. Disconnect the connector (AB34) from curtain airbag sensor RH, and connect the connector (2V) in test harness V to connector (AB34).
    5. Measure the resistance between connector (3V) in test harness V and chassis ground, and the resistance between connector (3V) terminals in test harness V.

      Connector & terminal 

      (3V) No. 1 - Chassis ground:

      (3V) No. 2 - Chassis ground:

      (3V) No. 1 - (3V) No. 2:

    Is the resistance less than 10 Ω?

    Yes  : Go to  8.

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

  8. CHECK AIRBAG REAR HARNESS (BETWEEN SIDE AIRBAG SENSOR AND CURTAIN AIRBAG SENSOR RH)  .

    Measure the voltage between connector (3V) in the test harness V and chassis ground.

    Connector & terminal 

    (3V) No. 1 (+) - Chassis ground (-):

    (3V) 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 CURTAIN AIRBAG SENSOR RH AND DOOR SENSOR RH)  .

    Measure the resistance between connector (3V) in test harness V and chassis ground, and the resistance between connector (3V) terminals in test harness V.

    Connector & terminal 

    (3V) No. 4 - Chassis ground:

    (3V) No. 5 - Chassis ground:

    (3V) No. 4 - (3V) No. 5:

    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 CURTAIN AIRBAG SENSOR RH AND FRONT DOOR IMPACT SENSOR RH)  .

    Measure the voltage between connector (3V) in the test harness V and chassis ground. Connector & terminal

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

    (3V) No. 5 (+) - 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 (DIAG)>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 B1642 displayed? (Current malfunction)

    Yes  : Go to  12.

    No  : Go to  15.

  12. REPLACE SIDE AIRBAG SENSOR RH 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>REPAIR CONTENTS>NOTE>BATTERY .
      NOTE: For the hybrid model, turn the ignition switch to OFF, and wait for 60 seconds or more after disconnecting the ground terminal from the battery.
    2. Replace the side airbag sensor RH. Ref. to AIRBAG SYSTEM>SIDE AIRBAG SENSOR>REMOVAL .
    3. Connect all connectors.
    4. Using the Subaru Select Monitor, perform the clear memory of [Airbag]. Ref. to COMMON (DIAG)>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 B1642 displayed? (Current malfunction)

    Yes  : Go to  13.

    No  : Go to  15.

  13. REPLACE CURTAIN AIRBAG SENSOR RH 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>REPAIR CONTENTS>NOTE>BATTERY .
      NOTE: For the hybrid model, turn the ignition switch to OFF, and wait for 60 seconds or more after disconnecting the ground terminal from the battery.
    2. Replace the curtain airbag sensor RH. Ref. to AIRBAG SYSTEM>CURTAIN AIRBAG SENSOR>REMOVAL .
    3. Connect all connectors.
    4. Using the Subaru Select Monitor, perform the clear memory of [Airbag]. Ref. to COMMON (DIAG)>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 B1642 displayed? (Current malfunction)

    Yes  : Go to  14.

    No  : Go to  15.

  14. REPLACE FRONT DOOR IMPACT SENSOR RH 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>REPAIR CONTENTS>NOTE>BATTERY .
      NOTE: For the hybrid model, turn the ignition switch to OFF, and wait for 60 seconds or more after disconnecting the ground terminal from the battery.
    2. Replace the front door impact sensor RH. Ref. to AIRBAG SYSTEM>FRONT DOOR IMPACT SENSOR>REMOVAL .
    3. Connect all connectors.
    4. Using the Subaru Select Monitor, perform the clear memory of [Airbag]. Ref. to COMMON (DIAG)>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 B1642 displayed? (Current malfunction)

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

    No  : Go to  15.

  15. CHECK FOR ANY OTHER DTC ON DISPLAY  .

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

    Is any other DTC displayed? (Current malfunction)

    Yes  : Perform the diagnosis for other displayed DTCs. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

    No  : Finish the diagnosis.

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