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 .