Check PRG Driver's SW Input Circuit: Wiring diagram

Power rear gate system Ref. to WIRING SYSTEM>Power Rear Gate System>WIRING DIAGRAM .

Fig 1: Power Rear Gate CM Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK BACK-UP FUSE. 

   Check the fuse. Ref. to CHECK FUSE .

   Is the check result OK?

   • Yes: Go to 2. 
   • No: Replace the fuse.
2. CHECK DATA MONITOR. 

   Using Subaru Select Monitor, check [D SW]. Ref. to POWER REAR GATE (DIAGNOSTICS)>Data Monitor .

   Does the display switch between OFF ←→ ON according to PRG driver's SW operation?

   • Yes: Input circuit is normal.
   • No: Go to 3. 
3. CHECK HARNESS (OPEN CIRCUIT). 
   1. Turn the ignition switch to OFF.
   2. Disconnect the PRG CM connector.
   3. Disconnect the memory height SW connector.
   4. Turn the ignition switch to ON.
   5. Measure the resistance between PRG CM connector and PRG driver's SW connector.

      Connector & terminal 

      (R423) No. 16 - (i258) No. 1:

   Is the resistance less than 10 Ω?

   • Yes: Go to 4. 
   • No: Repair or replace the open circuit of harness.
4. CHECK HARNESS (GROUND SHORT CIRCUIT). 

   Measure the resistance between PRG CM connector and chassis ground.

   Connector & terminal 

   (R423) No. 16 - Chassis ground:

   Is the resistance 1 MΩ or more?

   • Yes: Go to 5. 
   • No: Repair or replace the short circuit of the harness.
5. CHECK HARNESS (SHORT CIRCUIT TO POWER SUPPLY). 

   Measure the voltage between PRG CM connector and chassis ground.

   Connector & terminal 

   (R423) No. 16 (+) - Chassis ground (-):

   Is the voltage less than 1 V?

   • Yes: Go to 6. 
   • No: Repair or replace the short circuit of the harness.
6. CHECK HARNESS (POWER SUPPLY CIRCUIT). 

   Measure the voltage between PRG driver's SW connector and chassis ground.

   Connector & terminal 

   (i258) No. 2 (+) - Chassis ground (-):

   Is the voltage 10.5 V or more and less than 16 V?

   • Yes: Go to 7. 
   • No: Repair or replace the open circuit of harness.
7. CHECK HARNESS (OPEN CIRCUIT). 

   Measure the resistance between PRG CM connector and chassis ground.

   Connector & terminal 

   (R423) No. 8 - Chassis ground:

   Is the resistance less than 10 Ω?

   • Yes: Go to 8. 
   • No: Repair or replace the open circuit of harness.
8. CHECK MEMORY HEIGHT SW UNIT. 

   Measure the switch resistance.

   Terminals 

   No. 1 -No. 2:

   Is the resistance 1 MΩ or more at OFF, and less than 1 Ω at ON?

   • Yes: Go to 9. 
   • No: Replace the memory height SW. Ref. to REMOVAL .
9. CHECK CONNECTOR. 

   Check for poor contact of connector.

   Is the check result OK?

   • Yes: Replace the PRG CM. Ref. to REMOVAL
   • No: Repair or replace the poor contact of connector.