HOW TO PROCEED WITH TROUBLESHOOTING HINT: This is a flowchart for vehicle pull. 
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Toyota Tundra Service Manual > Window Defogger System: Data List / Active Test
DATA LIST / ACTIVE TEST 1. ACTIVE TEST HINT: Using the Techstream to perform the Active Tests allows relays, VSVs and actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered befo ...
