When I did mine (same circumstances), I had to pop one relay in the from box and one behind the tail light (see the photo, the relay is the green box).A lot of people will tell you that all you need is the relay under the hood, but they rear relay is key. Why? because if you plugged the wiring harness in under the truck, by the spare tire and the relay under the hood, but not the green relay, a volt meter will show weak current when you check continuity at the harness. The green relay is available via mail order at Sewell Lexus.
Photo Attached.
Good luck!
Joe
Can you tell me how to get to the green relay (step by step)? thanks in advance