Power Rear Gate Inner Switch Does Not Function

WARNING: This page is about a different car, the 2021 Subaru Ascent. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Before performing diagnosis, initialize the power rear gate system by opening the power rear gate in manual operation, and then operating the power rear gate auto closer in the partially latched state.

Wiring diagram:

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

Courtesy of SUBARU OF AMERICA, INC.

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 power rear gate inner switch operation?

Yes :

Input circuit is normal.

No :

Go to 2.
CHECK HARNESS (OPEN CIRCUIT) .
1. Disconnect the Power rear gate control module connector in the order of (R423) → (R422).
2. Disconnect the power rear gate inner switch connector.
3. Measure the resistance between Power rear gate control module connector and power rear gate inner switch connector.
  Connector & terminal
  
  (R422) No. 6 - (D154) No. 2:
  
  Is the resistance less than 10 Ω?
  
  Yes :
  
  Go to 3.
  
  No :
  
  Repair or replace the open circuit of harness.
CHECK HARNESS (GROUND SHORT CIRCUIT) .
Measure the resistance between Power rear gate control module connector and chassis ground.

Connector & terminal

(R422) No. 6 - Chassis ground:

Is the resistance 1 MΩ or more?

Yes :

Go to 4.

No :

Repair or replace the short circuit of the harness.
CHECK HARNESS (OPEN CIRCUIT) .
Measure the resistance between power rear gate inner switch and chassis ground.

Connector & terminal

(D154) No. 1 - Chassis ground:

Is the resistance less than 10 Ω?

Yes :

Go to 5.

No :

Repair or replace the open circuit of harness.
CHECK POWER REAR GATE INNER SWITCH .
Check the resistance between power rear gate inner switch terminals.

Terminals

No. 1 - No. 2:

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

Yes :

Go to 6.

No :

Replace the power rear gate inner switch. Ref. to POWER REAR GATE SYSTEM>POWER REAR GATE INNER SWITCH .
CHECK CONNECTOR .
Is there poor contact of connector?

Yes :

Repair or replace the poor contact of connector.

No :

Replace Power rear gate control module. Ref. to POWER REAR GATE SYSTEM>POWER REAR GATE CONTROL MODULE .