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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Air Bag System (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC B1648 Side Satellite Sensor Bus LH Initialization Error >> Wiring diagram

DTC B1648 Side Satellite Sensor Bus LH Initialization Error: Wiring diagram

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

Fig 1: Side Satellite Sensor BUS (LH) Initialization Error System Wiring Diagram
G10410391Courtesy of SUBARU OF AMERICA, INC.
  1. INSPECTION OF AIRBAG SYSTEM. 
    1. Perform the Inspection Mode. Ref. to AIRBAG (DIAGNOSTICS)>Inspection Mode .
    2. Read the DTC. Ref. to AIRBAG (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

    Is [AIRBAG ECU MALFUNCTION], or DTC B1625, DTC B1635, DTC B1695 a current malfunction?

  2. CHECK POOR CONTACT OF CONNECTORS. 

    Check for poor contact of the connectors between the airbag control module and the front door impact sensor LH.

    Is there poor contact?

    • Yes  : Replace the door harness LH, or replace the airbag rear harness along with body harness.
    • No  : Go to 3. 
  3. CHECK AIRBAG REAR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND SIDE AIRBAG SENSOR LH). 
    1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more.
    2. Disconnect the connector (AB21) from seat belt pretensioner LH.
    3. Disconnect the connector (AB31) from curtain airbag module LH.
    4. Disconnect the connector (AB19) of the side airbag module LH.
    5. Disconnect the connectors (AB6, AB17, AB18) from airbag control module.
    6. Disconnect the connector (AB23) from side airbag sensor LH, and connect the connector (2V) in test harness V to connector (AB23).
    7. Measure the resistance between connector (3V) in test harness V and chassis ground, and 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 1 MΩ or more?

    • Yes  : Go to 4. 
    • No  : Replace the airbag rear harness along with body harness.
  4. CHECK AIRBAG REAR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND SIDE AIRBAG SENSOR LH). 

    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 5. 
    • No  : Replace the airbag rear harness along with body harness.
  5. CHECK AIRBAG REAR HARNESS (BETWEEN SIDE AIRBAG SENSOR LH AND CURTAIN AIRBAG SENSOR LH). 
    1. Disconnect the connector (2V) in the test harness V from the connector (AB23) of side airbag sensor LH.
    2. Connect the connector (AB23) of side airbag sensor LH 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 (AB32) from curtain airbag sensor LH, and connect the connector (2V) in test harness V to connector (AB32).
    5. Measure the resistance between connector (3V) in test harness V and chassis ground, and 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 1 MΩ or more?

    • Yes  : Go to 6. 
    • No  : Replace the airbag rear harness along with body harness.
  6. CHECK AIRBAG REAR HARNESS (BETWEEN SIDE AIRBAG SENSOR LH AND CURTAIN AIRBAG SENSOR LH). 

    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 AND DOOR HARNESS LH (BETWEEN CURTAIN AIRBAG SENSOR LH AND FRONT DOOR IMPACT SENSOR LH). 
    1. Disconnect the connector (AB58) from front door impact sensor LH.
    2. Measure the resistance between connector (3V) in test harness V and chassis ground, and 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  9
    • No  : Go to 8. 
  8. CHECK AIRBAG REAR HARNESS AND DOOR HARNESS LH (BETWEEN CURTAIN AIRBAG SENSOR LH AND FRONT DOOR IMPACT SENSOR LH). 
    1. Disconnect the connector (R123) in the airbag rear harness and the connector (AB62) in the door harness RH.
    2. Measure the resistance between connector (3V) in test harness V and chassis ground, and 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  : Replace the door harness LH.
    • No  : Replace the airbag rear harness along with body harness.
  9. CHECK AIRBAG REAR HARNESS AND DOOR HARNESS LH (BETWEEN CURTAIN AIRBAG SENSOR LH AND FRONT DOOR IMPACT SENSOR LH). 

    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  : Go to 10. 
  10. CHECK AIRBAG REAR HARNESS AND DOOR HARNESS RH (BETWEEN CURTAIN AIRBAG SENSOR RH AND FRONT DOOR IMPACT SENSOR RH). 
    1. Disconnect the connector (R123) in the airbag rear harness and the connector (AB62) in the door harness RH.
    2. 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  : Replace the door harness LH.
    • No  : Replace the airbag rear harness along with body harness.
  11. REPLACE FRONT DOOR IMPACT SENSOR LH AND CHECK AIRBAG CONTROL MODULE AFTER REPLACEMENT. 
    1. Replace the front door impact sensor LH. Ref. to AIRBAG SYSTEM>Front Door Impact Sensor>REMOVAL .
    2. Connect all connectors.
    3. Connect the battery ground terminal and turn the ignition switch to ON.
    4. Clear the memory. Ref. to AIRBAG (DIAGNOSTICS)>Clear memory .
    5. Perform the Inspection Mode. Ref. to AIRBAG (DIAGNOSTICS)>Inspection Mode .
    6. Read the DTC. (Current malfunction) Ref. to AIRBAG (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

    Is DTC: B1648 a current malfunction?

    • Yes  : Go to 12. 
    • No  : Finish the diagnosis.
  12. REPLACE CURTAIN AIRBAG SENSOR LH AND CHECK AIRBAG CONTROL MODULE AFTER REPLACEMENT. 
    1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more.
    2. Replace the curtain airbag sensor LH. Ref. to AIRBAG SYSTEM>Curtain Airbag Sensor>REMOVAL .
    3. Connect the battery ground terminal and turn the ignition switch to ON.
    4. Clear the memory. Ref. to AIRBAG (DIAGNOSTICS)>Clear memory .
    5. Perform the Inspection Mode. Ref. to AIRBAG (DIAGNOSTICS)>Inspection Mode .
    6. Read the DTC. (Current malfunction) Ref. to AIRBAG (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

    Is DTC: B1648 a current malfunction?

    • Yes  : Go to 13. 
    • No  : Finish the diagnosis.
  13. REPLACE SIDE AIRBAG SENSOR LH AND CHECK AIRBAG CONTROL MODULE AFTER REPLACEMENT. 
    1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more.
    2. Replace the side airbag sensor LH. Ref. to AIRBAG SYSTEM>Side Airbag Sensor>REMOVAL .
    3. Connect the battery ground terminal and turn the ignition switch to ON.
    4. Clear the memory. Ref. to AIRBAG (DIAGNOSTICS)>Clear memory .
    5. Perform the Inspection Mode. Ref. to AIRBAG (DIAGNOSTICS)>Inspection Mode .
    6. Read the DTC. (Current malfunction) Ref. to AIRBAG (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

      Is DTC B1648 a current malfunction?

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