SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSSUBARU2005OUTBACK I, STANDARDREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSSECURITY AND LOCKSKEYLESS ENTRY SYSTEMINSPECTIONCHECK KEY WARNING SWITCH
2005 Subaru Outback i, Standard

Check Key Warning Switch

2005 Subaru Outback i, StandardSECTION Check Key Warning Switch
STEP CHECK SHEET

Step Check Yes No
1. CHECK FUSE. 

Remove and visually check the fuse No. 14 (in the main fuse box).

 Is the fuse blown out? Replace the fuse with a new one. Go to step 2. 
2. CHECK KEY WARNING SWITCH CIRCUIT. 
  1. Disconnect the harness connector of body integrated unit.
  2. Insert the key into ignition switch. (LOCK position)
  3. Measure the voltage between the harness connector terminal and chassis ground.

Connector & terminal 

(B281) No. 7 (+) - Chassis ground (-): 

 Is the voltage more than 10 V? Go to step 3.  Go to step 4. 
3. CHECK KEY WARNING SWITCH CIRCUIT. 
  1. Remove the key from ignition switch.
  2. Measure the voltage between the harness connector terminal and chassis ground.

Connector & terminal 

(B281) No. 7 (+) - Chassis ground (-): 

 Is the voltage 0 V? The key warning switch is OK. Go to step 4. 
4. CHECK KEY WARNING SWITCH. 
  1. Disconnect the key warning switch harness connector.
  2. Insert the key into ignition switch. (LOCK position)
  3. 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 5.  Replace the key warning switch.
5. CHECK KEY WARNING SWITCH. 
  1. Remove the key from ignition switch.
  2. Measure the resistance between key warning switch terminals.

Connector & terminal 

(B350) No. 3 - No. 4: 

 Is the resistance more than 1 MΩ? 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.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.