Ground Short Inspection

• MAIN-CAN

Wiring diagram: 

CAN communication system Ref. to WIRING SYSTEM>CAN COMMUNICATION SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK BETWEEN RELATED LINES AND MAIN WIRING HARNESS  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the steering angle sensor connector.
   3. Using the tester, measure the resistance between terminals.

      Connector & terminal 

      (i74) No. 2 - Chassis ground:

      (i74) No. 3 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes: Go to  2 .

   No: Currently, it is normal.

2. CHECK CONTROL MODULE  .

   With the tester connected, disconnect control module.

   NOTE: Disconnect the body integrated unit at the end.

   Connector & terminal 

   (i74) No. 2 - Chassis ground:

   (i74) No. 3 - Chassis ground:

   Did the resistance change to 10 Ω or more?

   Yes: Replace the control module whose resistance has changed. When the value changed at disconnecting the body integrated unit.

   Go to  3 .

   No: Repair or replace the short circuit of the main wiring harness and related lines between body integrated unit and ECM.

3. CHECK BETWEEN MAIN WIRING HARNESSES  .

   Using the tester, measure the resistance between terminals.

   Connector & terminal 

   (i171) No. 22 - Chassis ground:

   (i171) No. 2 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes: Repair or replace the short circuit of the main wiring harness and related lines between ECM and body integrated unit.

   No: Replace the body integrated unit. Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT>REMOVAL .

• BODY-CAN

Wiring diagram: 

CAN communication system Ref. to WIRING SYSTEM>CAN COMMUNICATION SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK BETWEEN RELATED LINES AND MAIN WIRING HARNESS  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the impact sensor connector.
   3. Using the tester, measure the resistance between terminals.

      Connector & terminal 

      (i188) No. 5 - Chassis ground:

      (i188) No. 6 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes: Go to  2 .

   No: Currently, it is normal.

2. CHECK CONTROL MODULE  .

   With the tester connected, disconnect control module.

   NOTE: Disconnect the body integrated unit at the end.

   Connector & terminal 

   (i188) No. 5 - Chassis ground:

   (i188) No. 6 - Chassis ground:

   Did the resistance change to 10 Ω or more?

   Yes: Replace the control module whose resistance has changed. When the value changed at disconnecting the body integrated unit.

   Go to  3 .

   No: Repair or replace the short circuit of the main wiring harness or related lines between body integrated unit and impact sensor.

3. CHECK BETWEEN MAIN WIRING HARNESSES  .

   Using the tester, measure the resistance between terminals.

   Connector & terminal 

   (B281) No. 31 - Chassis ground:

   (B281) No. 15 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes: Repair or replace the short circuit of the main wiring harness and related lines between ECM and body integrated unit.

   No: Replace the body integrated unit. Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT>REMOVAL .