Hi. Thanks for using JA! I will try and help you out.
The most common part that causes the Intake heater not to operate is the control module. It is the small black box on the top top the engine on the passenger side.
When you say you changed the switch on the engine, are you taking about the control module or something else?
Thanks for the information.
I have not ever tried to bypass it. I'm sure it's possible if you can "Jump" the correct wires together.
The Module is located on the passenger side of the engine on the head kinda near the back of the engine. Here is an image of what it looks like.
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The part number is XXXXX
Sorry for the delay.
I was trying to find an image that shows it but I cannot seem to find one. There should be a wiring harness on top of the engine. There should be a small set of wires that come out of the harness and connect to the module.