Check Body Integrated Unit Power Supply And Ground Circuit: Notes

Wiring diagram: 

• Model without keyless access with push button start: keyless entry system Ref. to WIRING SYSTEM>KEYLESS ENTRY SYSTEM>WIRING DIAGRAM .
• Model with the keyless access with push button start: keyless access with push button start system Ref. to WIRING SYSTEM>KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK FUSE  .
   1. Turn the ignition switch to OFF.
   2. Check the fuse on the upstream of the body integrated unit. Ref. to SECURITY AND LOCKS>RELAY AND FUSE>INSPECTION .

   Is the check result OK?

   Yes:  Go to  2.

   No:  Replace the defective fuse.

2. CHECK POWER SUPPLY  .
   1. Disconnect the connector of body integrated unit.
   2. Measure the voltage between the body integrated unit connector and chassis ground.

      Connector & terminal 

      (B152) No. 3 (+)- Chassis ground (-):

      (B280) No. 1 (+)- Chassis ground (-):

      (B281) No. 7 (+)- Chassis ground (-):

      (B287) No. 4 (+)- Chassis ground (-):

   Is the voltage 9 V or more?

   Yes:  Go to  3.

   No:  Check the harness for open or short circuit between body integrated unit and fuse.

3. CHECK GROUND CIRCUIT  .

   Measure the resistance between the body integrated unit connector and chassis ground.

   Connector & terminal 

   (i84) No. 4 - Chassis ground:

   (B287) No. 1 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes:  The power supply and ground circuit are OK.

   No:  Repair or replace the harness.