DTC B1698: Door Sensor LH Initialization Incomplete

Diagnosis start condition: 

When the ignition voltage is 10 - 16 V.

DTC detecting condition: 

• Open or short circuit in harness of side sensor bus LH.
• Front door impact sensor LH is faulty.
• Curtain airbag sensor LH is faulty.
• Airbag control module is faulty.

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 .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .

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

   Is DTC B1627 or B1628 displayed? (Current malfunction)

   Yes  : Perform the diagnosis for the displayed DTC B1627 or B1628. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1627 SIDE AIRBAG SENSOR LH LOST COMMUNICATION . Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1628 SIDE AIRBAG SENSOR LH 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 B1637 or B1638 displayed? (Current malfunction)

   Yes  : Perform the diagnosis for the displayed DTC B1637 or B1638. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1637 CURTAIN AIRBAG SENSOR LH LOST COMMUNICATION . Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1638 CURTAIN AIRBAG SENSOR LH 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 [AIRBAG ECU MALFUNCTION] or B1690 displayed? (Current malfunction)

   Yes  : Perform the diagnosis for the displayed [AIRBAG ECU MALFUNCTION] or B1695. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1000 AIRBAG ECU MALFUNCTION . Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1695 DOOR SENSOR LH FAILURE .

   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 LH.

   Is there poor contact?

   Yes  : Replace the airbag rear harness.

   No  : Go to  5.

5. CHECK AIRBAG REAR HARNESS (BETWEEN CURTAIN AIRBAG SENSOR LH AND FRONT DOOR IMPACT SENSOR LH)  .
   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 (AB21) from seat belt pretensioner LH.
   3. Disconnect the connector (AB31) from curtain airbag module LH.
   4. Disconnect the connector (AB19) from side airbag module LH.
   5. Disconnect the connector (AB32) from curtain airbag sensor LH, and connect the connector (2V) in test harness V to connector (AB32).
   6. Disconnect the connector (AB58) from the front door impact sensor LH, and connect the connector (1H) in the test harness H to connector (AB58).
   7. Measure the resistance between connector (3V) in the test harness V and connector (3H) in the test harness H.

      Connector & terminal 

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

      (3V) No. 5 - (3H) No. 6:

   Is the resistance less than 10 Ω?

   Yes  : Go to  6.

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

6. CHECK AIRBAG REAR HARNESS (BETWEEN CURTAIN AIRBAG SENSOR LH AND FRONT DOOR IMPACT SENSOR LH)  .

   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  7.

   No  : Replace the airbag rear harness along with body harness

7. 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 B1697 or B1698 displayed? (Current malfunction)

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

   No  : Go to  8.

8. 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.