Diagnostic Procedure

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK LAN SYSTEM. Inspect LAN system. < Refer to PROCEDURE , Basic Diagnostic Procedure. >	Is LAN system normal?	Go to step 2 .	Perform the inspection according to the diagnosis for LAN system.
2 CHECK CURRENT DATA. Confirm the current data display of keyless access system using Subaru Select Monitor. Stop light SW	Is DTC displayed normally according to the brake pedal operation?	Go to step 3 .	Check the stop light switch circuit.
3 CHECK CURRENT DATA. Confirm the current data display of body integrated unit using Subaru Select Monitor. Stop light SW	Is DTC displayed normally according to the brake pedal operation?	Go to step 4 .	Check the body integrated unit and the stop light switch circuit.
4 CHECK FUSE. Remove the fuse.	Is the fuse OK?	Go to step 5 .	Replace the fuse. When the replaced fuse is blown immediately, check the power supply circuit for short-circuited.
5 CHECK HARNESS. Disconnect the keyless access CM connector. Using a tester, measure the voltage between keyless access CM connectors. Connector & terminal (B572) No. 2 (+) - Chassis ground (-):	Is the voltage 9.5 - 16 V?	Go to step 6 .	Check the power supply circuit.
6 CHECK HARNESS. Using a tester, measure the resistance between the keyless access CM connector and chassis ground. Connector & terminal (B572) No. 11 - Chassis ground:	Is the resistance less than 1 Ω?	Go to step 7 .	Repair or replace the open circuit of harness.
7 CHECK HARNESS. Disconnect the stop light switch connector. Using a tester, measure the resistance between the keyless access CM connector and stop light switch connector. Connector & terminal (B572) No. 18 - (B65) No. 3:	Is the resistance less than 1 Ω?	Go to step 8 .	Repair or replace the open circuit of harness.
8 CHECK HARNESS. Using a tester, measure the resistance between the keyless access CM connector and chassis ground. Connector & terminal (B572) No. 18 - Chassis ground:	Is the resistance 10 kΩ or more?	Go to step 9 .	Repair or replace the short circuit of the harness.
9 CHECK HARNESS. Using a tester, measure the voltage between the keyless access CM connector and chassis ground when the brake pedal is depressed. Connector & terminal (B572) No. 18 (+) - Chassis ground (-):	Does the voltage change as follows? Brake pedal not depressed: 1 V or less → Brake pedal depressed: 11 - 14 V	Replace the keyless access CM. < Refer to REMOVAL , Keyless Access CM. >	Check the power supply circuit of stop light switch.