HANDSFREE Off Switch Does Not Function

Wiring diagram:

Power rear gate system Ref. to WIRING SYSTEM>POWER REAR GATE SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

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.

CHECK HARNESS (OPEN CIRCUIT) .
1. Disconnect the connector of body integrated unit.
2. Disconnect the connector of handsfree OFF switch.
3. Using the tester, measure the voltage between the body integrated unit connector and the handsfree OFF switch connector.
  Connector and terminal
  
  (i83) No. 25 - (i142) No. 1:
Is the resistance less than 10 Ω?

Yes: Go to 2 .

No: Repair or replace the open circuit of harness.
CHECK HARNESS (GROUND SHORT CIRCUIT) .
Measure the resistance between body integrated unit connector and chassis ground using tester.

Connector and terminal

(i83) No. 25 - Chassis ground:

Is the resistance 1 MΩ or more?

Yes: Go to 3 .

No: Repair or replace the short circuit of the harness.
CHECK HARNESS (OPEN CIRCUIT) .
Using a tester, measure the resistance between handsfree OFF switch connector and chassis ground.

Connector and terminal

(i142) No. 4 - Chassis ground:

Is the resistance less than 10 Ω?

Yes: Go to 4 .

No: Repair or replace the open circuit of harness.
CHECK HANDSFREE OFF SWITCH .
Using a tester, measure the resistance between terminals of handsfree OFF switch connector.

Terminals

No. 1 - No. 4:

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

Yes: Go to 5 .

No: Replace the handsfree OFF switch. Ref. to POWER REAR GATE SYSTEM>HANDSFREE POWER REAR GATE .
CHECK LAN SYSTEM .
Perform the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

Is the check result OK?

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

No: Perform the inspection according to the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .