HOW TO PROCEED WITH TROUBLESHOOTING HINT: This is a flowchart for vehicle pull. 
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Toyota Tundra Service Manual > Lighting: Headlight Dimmer Relay
On-vehicle Inspection ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT HEADLIGHT DIMMER RELAY (a) Remove the headlight dimmer relay from the engine room relay box. (b) Check the resistance. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Cond ...
