Greater Than 52 Ω And Less Than 62 Ω: Main-Can

Wiring diagram: 

CAN communication system Ref. to WIRING SYSTEM (IMPREZA MODEL)>CAN COMMUNICATION SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>CAN COMMUNICATION SYSTEM>WIRING DIAGRAM .

• Impreza model

  Courtesy of SUBARU OF AMERICA, INC.

  Courtesy of SUBARU OF AMERICA, INC.

• Crosstrek model

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 sensor connector.
   3. Using a tester, measure the resistance between the steering sensor connector and chassis ground.

      Connector and terminal 

      (i74) No. 2 - Chassis ground:

      (i74) No. 3 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes:  Go to  2.

   No:  Go to  3.

2. CHECK CONTROL MODULE  .

   With the tester connected, disconnect control module.

   NOTE: Disconnect the body integrated unit at the end.

   Connector and 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, replace the body integrated unit. Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT>REMOVAL . Go to  3.

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

3. CHECK BETWEEN RELATED LINES AND MAIN WIRING HARNESS  .
   1. Turn the ignition switch to ON.
   2. Using a tester, measure the voltage between the steering sensor connector and chassis ground.

      Connector and terminal 

      (i74) No. 2 (+) - Chassis ground (-):

      (i74) No. 3 (+) - Chassis ground (-):

   Is the voltage 5 V or less?

   Yes:  CAN communication circuit is normal.

   No:  Go to  4.

4. CHECK CONTROL MODULE  .

   With the tester connected, disconnect control module.

   NOTE: Disconnect the body integrated unit at the end.

   Connector and terminal 

   (i74) No. 2 (+) - Chassis ground (-):

   (i74) No. 3 (+) - Chassis ground (-):

   Did the voltage change to 5 V or less?

   Yes:  Replace the control module whose voltage has changed. When the value changed at disconnecting the body integrated unit, replace the body integrated unit. Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT>REMOVAL . Go to  5.

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

5. CHECK HARNESS  .

   Measure the voltage between body integrated unit connector and chassis ground using tester.

   Connector and terminal 

   (i171) No. 1 (+) - Chassis ground (-):

   (i171) No. 2 (+) - Chassis ground (-):

   Is the voltage 5 V or less?

   Yes:  CAN communication circuit is normal.

   No:  Repair or replace the short circuit of the harness between ECM - body integrated unit.