Check Key Warning Switch

WARNING: This page is about a different car, the 2005 Subaru Baja. However, it is still accessible from the selected car via links, so may be relevant.

KEY WARNING SWITCH

Step	Check	Yes	No
1 CHECK FUSE. Remove and visually check the fuse No. 6 (in the main fuse box).	Is the fuse blown out?	Go to step 2.	Replace the fuse with a new one.
2 CHECK KEY WARNING SWITCH CIRCUIT. Disconnect the keyless entry control module harness connector. Insert the key into the ignition switch. (LOCK position) Measure the voltage between the harness connector terminal and chassis ground. Connector & terminal (B176) No. 7 (+) - Chassis ground (-):	Is the measured value more than 10 V?	Go to step 3.	Go to step 4.
3 CHECK KEY WARNING SWITCH CIRCUIT. Remove the key from the ignition switch. Measure the voltage between the harness connector terminal and chassis ground. Connector & terminal (B176) No. 7 (+) - Chassis ground (-):	Is the measured value less than 1.5 V?	Key warning switch is OK.	Go to step 4.
4 CHECK KEY WARNING SWITCH. Disconnect the key warning switch harness connector. Insert the key into the ignition switch. (LOCK position) Measure the resistance between the key warning switch terminals. Terminal No. 1 - No. 2:	Is the measured value less than 1 Ω?	Go to step 5.	Replace the key warning switch.
5 CHECK KEY WARNING SWITCH. Remove the key from the ignition switch. Measure the resistance between the key warning switch terminals. Terminal No. 1 - No. 2:	Is the measured value more than 1 MΩ?	Check the following: Harness for open circuits and shorts between the key warning switch and fuse Harness for open circuits and shorts between the keyless entry control module and key warning switch	Replace the key warning switch.