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Rear Gate Cannot Be Unlocked With The Rear Gate Opener Button

WARNING: This page is about a different car, the 2014 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • Check that there are no other registered access keys inside the rear gate.
  • Inspect LAN system according to the basic diagnostic procedure, and make sure that there is no fault.
  • Check that the keyless access function is not stopped.
  • When the access key or keyless access control module is replaced, registration of the immobilizer is required. For the relevant procedures, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER".
Step Check Yes No
1 CHECK KEYLESS OPERATION. 
Check that the rear gate unlocks when the rear gate unlock button of the access key is pressed.		 Does it operate properly? Go to step 6  . For vehicles without power rear gate Go to step 2  .
For vehicles with power rear gate < Ref. to PRG OPENER BUTTON DOES NOT FUNCTION , INSPECTION, Diagnostics with Phenomenon. >
2 CHECK REAR GATE UNLOCK OPERATION. 
  1. Using the Subaru Select Monitor, select the function check «R gate/trunk UNLK output» of the body integrated unit.
  2. Check that the rear gate unlocks when the R gate/trunk UNLK signal is output.
 Does it operate properly? Go to step 6  . Go to step 3  .
3 CHECK HARNESS. 
  1. Disconnect the body integrated unit connector and rear gate lock actuator connector.
  2. Check the continuity between body integrated unit connector and rear gate lock actuator connector.

    Connector & terminal 

    (i171) No. 7 - (D46) No. 1: 

 Is there continuity? Go to step 4  . Repair or replace the open circuit of harness.
4 CHECK HARNESS. 
  1. Check the continuity between the rear gate lock actuator connector and chassis ground.

    Connector & terminal 

    (D46) No. 2 - Chassis ground: 

 Is there continuity? Go to step 5  . Repair or replace the open circuit of harness.
5 CHECK REAR GATE LOCK ACTUATOR. 
  1. Check the rear gate lock actuator. < Ref. to INSPECTION , Rear Gate Latch and Actuator Assembly. >
 Is the rear gate lock actuator normal? Replace the body integrated unit. < Ref. to BODY INTEGRATED UNIT . > Replace the rear gate latch and actuator assembly. < Ref. to REAR GATE LATCH AND ACTUATOR ASSEMBLY . >
6 CHECK ACCESS KEY. 
  1. Prepare all access keys registered to the vehicle.
  2. Check that the rear gate lock can be unlocked with each access key.
 Does it operate properly? Go to step 7  . Replace the access key. < Ref. to REPLACEMENT , Access Key. >
7 CHECK CURRENT DATA. 
  1. Display the current data «R Gate Release SW input» of body integrated unit using Subaru Select Monitor.
  2. Read the data when pressing the rear gate opener button.
 Does the data display ON? Go to step 14  . Go to step 8  .
8 CHECK WIRING HARNESS. 
  1. Disconnect the rear gate opener button connector and body integrated unit connector.
  2. Using a tester, check the continuity between the rear gate opener button connector and body integrated unit connector.

    Connector & terminal 

    (D77) No. 5 - (i84) No. 10: 

 Is there continuity? Go to step 9  . Repair or replace the open circuit of harness.
9 CHECK WIRING HARNESS. 
  1. Using a tester, check the continuity between the rear gate opener button connector and chassis ground.

    Connector & terminal 

    (D77) No. 6 - Chassis ground: 

 Is there continuity? Go to step 10  . Repair or replace the open circuit of harness.
10 CHECK REAR GATE OPENER BUTTON. 
Using a tester, check the continuity between rear gate opener button switch terminals.
Connector & terminal 
(D77) No. 5 - (D77) No. 6: 		 Is there continuity when pressing the switch? Go to step 11  . Replace the rear gate opener button. < Ref. to REMOVAL , Rear Gate Opener Button. >
11 CHECK WIRING HARNESS. 
  1. Disconnect the exterior rear antenna connector and the keyless access CM connector.
  2. Using a tester, check continuity between the exterior rear antenna connector and keyless access CM connector.

    Connector & terminal 

    (AD23) No. 1 - (B573) No. 2: 

    (AD23) No. 2 - (B573) No. 1: 

 Is there continuity? Go to step 12  . Repair or replace the open circuit of harness.
12 CHECK OUTSIDE REAR ANTENNA. 
Replace the outside rear antenna with new or properly working parts. < Ref. to REMOVAL , Keyless Access Outdoor Antenna. >		 Does it operate properly? The outside rear antenna has a failure. Go to step 13  .
13 CHECK CURRENT DATA. 
  1. Display the current data «R gate lock status SW input» of body integrated unit using Subaru Select Monitor.
  2. Read the data when locking/unlocking the rear gate lock actuator.
 Does the data change from ON ←→ OFF? Go to step 14  . Check body integrated unit. < Ref. to REMOVAL , Body Integrated Unit. >
14 CHECK KEYLESS ACCESS SYSTEM CHECK. 
  1. Using the Subaru Select Monitor, select System check of the keyless access CM «Rear gate external transmitter + interior tuner». < Ref. to KEYLESS ACCESS SYSTEM CHECK . >
  2. Hold the access key 1 m or more away from the trunk, then come closer to within 0.8 m.
 Does the outside buzzer sound? System is normal. Replace the keyless access CM. < Ref. to REMOVAL , Keyless Access CM. >
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