Can Not Lock When Using The Rear Lock Button

CAUTION:

Check that there are no other registered access keys inside the vehicle.
Check that the keyless access function is not stopped.
Inspect LAN system or keyless access system according to the basic diagnostic procedure, and make sure that DTC is not input.
When the access key or keyless access CM 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 REAR GATE ACTUATOR. While carrying the access key, operate the front lock button and touch sensor.	When the switch is operated, does the rear gate lock/unlock?	Go to step 2 .	Go to step 10 .
2 CHECK OUTSIDE REAR ANTENNA. Replace the outside rear antenna with new or properly working parts.	Does it operate properly?	Replace the outside rear antenna.	Go to step 3 .
3 CHECK CURRENT DATA. Display the current data «R gate lock status SW input» of body integrated unit using Subaru Select Monitor. Read the data when locking/unlocking the rear gate lock actuator.	Does the data change from ON ↔ OFF?	Go to step 4 .	Check body integrated unit. < Refer to REMOVAL , Body Integrated Unit. >
4 CHECK REAR LOCK BUTTON. Display the «Rear Gate Request SW» of the keyless access CM using the Subaru Select Monitor. Read the data when operating the rear lock button.	Does the data change between ON/OFF?	Go to step 10 .	Go to step 5 .
5 CHECK HARNESS. Disconnect the rear lock button connector and the keyless access CM connector. Using a tester, measure the resistance between harness. Connector & terminal (D77) No. 3 - (i241) No. 27:	Is the resistance less than 10 Ω?	Go to step 6 .	Repair or replace the open circuit of the harness.
6 CHECK HARNESS. Using a tester, measure the resistance between harness and chassis ground. Connector & terminal (D77) No. 3 - Chassis ground:	Is the resistance 10 MΩ or more?	Go to step 7 .	Repair or replace the short of harness.
7 CHECK HARNESS. Using a tester, measure the resistance between harness and chassis ground. Connector & terminal (D77) No. 4 - Chassis ground:	Is the resistance less than 10Ω?	Go to step 8 .	Repair or replace the open circuit of the harness.
8 CHECK REAR LOCK BUTTON. Measure the resistance when the rear lock button is operated using the tester. Connector & terminal (D77) No. 3 - No. 4:	Did the resistance change from 1 MΩ or more to less than 10 Ω?	Go to step 9 .	Replace the rear lock button. < Refer to REMOVAL , Rear Lock Button. >
9 CHECK REAR LOCK BUTTON. Display the «Rear Gate Request SW» of the keyless access CM using the Subaru Select Monitor. Read the data when operating the rear lock button.	Does the data change between ON/OFF?	Go to step 10 .	Replace the keyless access CM. < Refer to REMOVAL , Keyless Access CM. >
10 CHECK BODY INTEGRATED UNIT. Connect the disconnected connectors. Use the Subaru Select Monitor to perform the body integrated unit function check. Actuate the door lock actuator LOCK output.	Does the rear gate lock actuator lock?	It is possible that temporary poor communication occurs.	Go to step 11 .
11 CHECK HARNESS. Disconnect the body integrated unit connector and rear gate lock actuator connector. Check the continuity between body integrated unit connector and rear gate lock actuator connector. Connector & terminal (i171) No. 7 - (D47) No. 1:	Is there continuity?	Go to step 12 .	Repair or replace the open circuit of harness.
12 CHECK HARNESS. Check the continuity between the rear gate lock actuator connector and chassis ground. Connector & terminal (D47) No. 2 - Chassis ground:	Is there continuity?	Go to step 13 .	Repair or replace the open circuit of harness.
13 CHECK REAR GATE LOCK ACTUATOR. Check the rear gate lock actuator. < Refer to INSPECTION , Rear Gate Latch and Actuator Assembly. >	Is the rear gate lock actuator normal?	Replace the body integrated unit. < Refer to BODY INTEGRATED UNIT . >	Replace the rear gate latch and actuator assembly. < Refer to REAR GATE LATCH AND ACTUATOR ASSEMBLY . >