Check PRG Inner SW Input Circuit: Wiring diagram

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

Fig 1: Power Rear Gate Inner Switch Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DATA MONITOR. 

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

   Does the display switch between OFF ←→ ON according to PRG inner SW operation?

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

      Connector & terminal 

      (R422) No. 2 - (i154) No. 1:

      (R423) No. 6 - (i154) No. 2:

   Is the resistance less than 10 Ω?

   • Yes: Go to 3. 
   • No: Repair or replace the open circuit of harness.
3. CHECK HARNESS (GROUND SHORT CIRCUIT). 

   Measure the resistance between PRG CM connector and chassis ground.

   Connector & terminal 

   (R422) No. 2 - Chassis ground:

   Is the resistance 1 MΩ or more?

   • Yes: Go to 4. 
   • No: Repair or replace the short circuit of the harness.
4. CHECK HARNESS (SHORT CIRCUIT TO POWER SUPPLY). 

   Measure the voltage between PRG CM connector and chassis ground.

   Connector & terminal 

   (R423) No. 6 (+) - Chassis ground (-):

   Is the voltage less than 1 V?

   • Yes: Go to 5. 
   • No: Repair or replace the short circuit of the harness.
5. 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 6. 
   • No: Repair or replace the short circuit of the harness.
6. CHECK PRG CM. 

   Measure the voltage between PRG CM connector and chassis ground.

   Connector & terminal 

   (R422) No. 2 (+) - Chassis ground (-):

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

   • Yes: Go to 7. 
   • No: Replace the PRG CM. Ref. to REMOVAL .
7. CHECK PRG INNER SW UNIT. 

   Measure the switch resistance.

   Terminals 

   No. 2 -No. 3:

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

   • Yes: Go to 8. 
   • No: Replace the PRG inner SW. Ref. to REMOVAL .
8. 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.