Check Power Supply And Ground Circuit

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Check power supply circuit.
1. Disconnect the remote control back rest switch.
2. Turn the ignition switch to ON.
3. Measure the voltage between harness connector terminal and chassis ground.
  Connector & terminal
  
  RH side:
  
  (R172) No. 5 (+) - Chassis ground (-):
  
  LH side:
  
  (R173) No. 5 (+) - Chassis ground (-):
  
  Is the voltage 12 V or more?
  - Yes → Go to step 2.
  - No → Check the harness between the remote control back rest switch and fuse.
Check ground circuit.
Measure the resistance between harness connector terminal and chassis ground.

Connector & terminal

RH side:

(R172) No. 1 - Chassis ground:

LH side:

(R173) No. 1 - Chassis ground:

Is the resistance less than 10 Ω when the switch is ON?
- Yes → Go to step 3.
- No → Check the switch.
Check power supply circuit.
1. Connect the remote control back rest switch.
2. Disconnect the remote control back rest actuator.
3. Turn the ignition switch to ON.
4. Measure the voltage between harness connector terminal and chassis ground.
  Connector & terminal
  
  RH side:
  
  (R170) No. 1 (+) - Chassis ground (-):
  
  LH side:
  
  (R171) No. 1 (+) - Chassis ground (-):
  
  Is the voltage 12 V or more when the switch is ON?
  - Yes → Go to step 4.
  - No → Check the harness between the remote control back rest switch and actuator.
Check ground circuit.
Measure the resistance between harness connector terminal and chassis ground.

Connector & terminal

RH side:

(R170) No. 2 - Chassis ground:

LH side:

(R171) No. 2 - Chassis ground:

Is the resistance 1 MΩ or more when the switch is ON?
- Yes → Perform the inspection of actuator unit.
- No → Repair the harness of ground circuit.