DTC B1693: Door Sensor RH 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 RH.
• Front door impact sensor RH is faulty.
• Curtain airbag sensor RH 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 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 [AIRBAG ECU MALFUNCTION] or B1690 displayed? (Current malfunction)

   Yes  : Perform the diagnosis for the displayed [AIRBAG ECU MALFUNCTION] or B1690. 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 B1690 DOOR SENSOR RH 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 RH.

   Is there poor contact?

   Yes  : Replace the airbag rear harness.

   No  : Go to  5.

5. CHECK AIRBAG REAR HARNESS (BETWEEN CURTAIN AIRBAG SENSOR RH AND DOOR 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) from side airbag module RH.
   6. Disconnect the connector (AB34) from curtain airbag sensor RH, and connect the connector (2V) in test harness V to connector (AB34).
   7. Disconnect the connector (AB64) from the front door impact sensor RH, and connect the connector (1H) in the test harness H to connector (AB64).
   8. 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 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  7.

   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.

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 B1692 or B1693 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.