Originally Posted by tpatten
I wouldn't rule out the door switch just yet, you have to remember there are 2 of them the driver and passenger door can both control the dome light.
Yes, both door switches control the dome light. However, I believe the driver’s door controls the key reminder. Since the OP is stating “Doors” in his original post one has to assume neither door currently activates the dome light.
Later in this thread he states the key reminder works. This would confirm the driver’s door switch is functional and providing chassis ground to the GEM with the door open.
When the GEM sees ground from either door switch, it provides a ground to the interior lamp relay, activating the dome light.
Since neither door switch is activating the dome light but can be manually activated via the dome light switch, the most likely common item would be the interior lamp relay, its associated wiring, or the GEM is not providing the ground signal for the lamp relay.