Check Power Supply Short

MAIN-CAN
Wiring diagram:

CAN communication system Ref. to WIRING SYSTEM>CAN Communication System>WIRING DIAGRAM .

G13872987

Courtesy of SUBARU OF AMERICA, INC.

G13872988

Courtesy of SUBARU OF AMERICA, INC.

NOTE: Main wiring harness or related lines may be shorted to battery circuit, or shorted to battery circuit in one of the control modules.

CHECK BETWEEN RELATED LINES AND MAIN WIRING HARNESS .
1. Turn the ignition switch to OFF.
2. Disconnect the steering angle sensor connector.
3. Turn the ignition switch to ON.
4. Use a tester to measure the voltage between the steering angle sensor connector and chassis ground.
  Connector & terminal
  
  (i74) No. 2 (+) - Chassis ground (-):
  
  (i74) No. 3 (+) - Chassis ground (-):
  
  Is the voltage 5 V or less?
  
  Yes : Currently, it is normal.
  
  No : Go to 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 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, Go to 3.

No : Repair or replace the short circuit of the harness between body integrated unit and ECM.
CHECK BETWEEN MAIN WIRING HARNESSES .
Measure the voltage between body integrated unit connector and chassis ground using tester.

Connector & terminal

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

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

Is the voltage 5 V or less?

Yes : Replace the body integrated unit. Ref. to SECURITY AND LOCKS>Body Integrated Unit>REMOVAL .

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

BODY-CAN
Wiring diagram:

CAN communication system Ref. to WIRING SYSTEM>CAN Communication System>WIRING DIAGRAM .

G13203246

Courtesy of SUBARU OF AMERICA, INC.

NOTE: Main wiring harness or related lines may be shorted to battery circuit, or shorted to battery circuit in one of the control modules.

CHECK BETWEEN RELATED LINES AND MAIN WIRING HARNESS .
1. Turn the ignition switch to OFF.
2. Disconnect the audio or navigation unit connector.
3. Turn the ignition switch to ON.
4. Using a tester, measure the voltage between audio or navigation unit connector and chassis ground.
  Connector & terminal
  
  (i87) No. 9 (+) - Chassis ground (-):
  
  (i87) No. 10 (+) - Chassis ground (-):
  
  Is the voltage 5 V or less?
  
  Yes : Currently, it is normal.
  
  No : Go to 2.
CHECK CONTROL MODULE .
With the tester connected, disconnect control module.

NOTE: Disconnect the body integrated unit at the end.

Connector & terminal

(i87) No. 9 (+) - Chassis ground (-):

(i87) No. 10 (+) - 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, Go to 3.

No : Repair or replace the short circuit of the harness between body integrated unit and audio or navigation unit.
CHECK BETWEEN MAIN WIRING HARNESSES .
Measure the voltage between body integrated unit connector and chassis ground using a tester.

Connector & terminal

(B281) No. 17 (+) - Chassis ground (-):

(B281) No. 19 (+) - Chassis ground (-):

Is the voltage 5 V or less?

Yes : Replace the body integrated unit. Ref. to SECURITY AND LOCKS>Body Integrated Unit>REMOVAL .

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