Check Key Warning Switch

CHECK CURRENT DATA .
Using the Subaru Select Monitor, display the data of «key-lock warning SW».

NOTE: For detailed procedures, refer to "PC application help for Subaru Select Monitor".

Is the normal input signal displayed when the key is inserted in/removed from the ignition switch?

Yes: The key warning switch is OK.

No: Go to 2.
CHECK FUSE .
Remove and visually check fuse No. 14 (in the main fuse box).

Is the fuse blown out?

Yes: Replace the fuse with a new part.

No: Go to 3.
CHECK KEY WARNING SWITCH CIRCUIT .
1. Disconnect the connector of body integrated unit.
2. Insert the key into ignition switch. (LOCK position)
3. Measure the voltage between the body integrated unit connector and chassis ground.
  Connector & terminal
  
  (B280) No. 4 (+) - Chassis ground (-):
Is the voltage 9 V or more?

Yes: Go to 4.

No: Go to 5.
CHECK KEY WARNING SWITCH CIRCUIT .
1. Remove the key from ignition switch.
2. Measure the voltage between the body integrated unit connector and chassis ground.
  Connector & terminal
  
  (B280) No. 4 (+) - Chassis ground (-):
Is the voltage less than 1.5 V?

Yes: The key warning switch is OK.

No: Go to 5.
CHECK KEY WARNING SWITCH .
1. Disconnect the connector of key warning switch.
2. Insert the key into ignition switch. (LOCK position)
3. Measure the resistance between key warning switch terminals.
  Terminals
  
  No. 1 - No. 2:
Is the resistance less than 1 Ω?

Yes: Go to 6.

No: Replace the key warning switch.
CHECK KEY WARNING SWITCH .
1. Remove the key from ignition switch.
2. Measure the resistance between key warning switch terminals.
  Terminals
  
  No. 1 - No. 2:
Is the resistance 1 MΩ or more?

Yes: 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.
No: Replace the key warning switch.