Check Key Warning Switch

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Step	Check	Yes	No
1 CHECK KEY WARNING SWITCH. Prepare the Subaru Select Monitor kit. On «System Selection Menu» display, select {Integ. unit mode}. Select {Current Data Display & Save}. Select the {key-lock warning SW}.	Is the normal input signal displayed when the key is inserted in/removed from the ignition switch?	The key warning switch is OK.	Go to step 2 .
2 CHECK FUSE. Remove and visually check fuse No. 14 (in the main fuse box).	Is the fuse blown out?	Replace the fuse with a new part.	Go to step 3 .
3 CHECK KEY WARNING SWITCH CIRCUIT. Disconnect the harness connector of body integrated unit. Insert the key into ignition switch. (LOCK position) Measure the voltage between body integrated unit and chassis ground. Connector & terminal (B279) No. 2 (+) - Chassis ground (-):	Is the voltage 9 V or more?	Go to step 4 .	Go to step 5 .
4 CHECK KEY WARNING SWITCH CIRCUIT. Remove the key from ignition switch. Measure the voltage between body integrated unit and chassis ground. Connector & terminal (B279) No. 2 (+) - Chassis ground (-):	Is the voltage 1.5 V?	The key warning switch is OK.	Go to step 5 .
5 CHECK KEY WARNING SWITCH. Disconnect the key warning switch connector. Insert the key into ignition switch. (LOCK position) Measure the resistance between key warning switch terminals. Connector & terminal (B350) No. 3 - No. 4:	Is the resistance less than 1 Ω?	Go to step 6 .	Replace the key warning switch.
6 CHECK KEY WARNING SWITCH. Remove the key from ignition switch. Measure the resistance between key warning switch terminals. Connector & terminal (B350) No. 3 - No. 4:	Is the resistance 1 MΩ or more?	Check the following: Harness for open circuits and shorts between the key warning switch and fuse Harness for open or short between the body integrated unit and key warning switch	Replace the key warning switch.