Check Power Supply Short

MAIN-CAN
Wiring diagram:

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

G13203243

Courtesy of SUBARU OF AMERICA, INC.

G13203244

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 sensor connector.
3. Turn the ignition switch to ON.
4. 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 : 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 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, Go to 3.

No : Repair or replace the shorted part of 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 and 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 shorted part 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 and 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 and 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 shorted part of harness between body integrated unit and audio or navigation unit.
CHECK BETWEEN MAIN WIRING HARNESSES.
Using the tester, measure the voltage between terminals.

Connector and 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 shorted part of harness between combination meter and body integrated unit.