I had a very similar problem. The window would operate (no problem) from the interior switch but not from the key switch. When using the tailgate key switch, I could hear the relay(s) operating. I replaced the relays but that didn't fix it. I checked the key switch and that tested out okay. I found the problem after a couple of days. Below the loom connection that connects to the relay control box, there is another connector that connects the tail gate loom to the main loom. There was a very, very small amount of corrosion on this connector. Cleaned up with tons of oil based, spray, contact cleaner and now it works a treat.
For those that really want to know, the corrosion was around the up and down wires from the key switch. When you turned the key, it actually ended up turning on both relays! Any corrosion on said connector could cause no end of problems.
For those that really want to know, the corrosion was around the up and down wires from the key switch. When you turned the key, it actually ended up turning on both relays! Any corrosion on said connector could cause no end of problems.
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