Rear defroster and light on console for rear defroster not working

Here is the entire wiring diagram for this system. If the light does not come on then I suspect either the AC control module itself (which is where the light is) or the BCM. However, if the BCM is the issue, I would suspect the light would come on. So we need to measure voltage on the pink wire of the AC module. If you have voltage there then we need to make sure the ground is good as well. If both are good then the module (button) is the issue.

Let me know and we can go from there.

Understood. I am sorry this one is not an easy answer. Unfortunately this will require some wiring testing unless you want to guess at it. More than likely it is the AC Control module. Please let me know how I can help and I am happy to do it. Thanks

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