joatmon wrote: ↑
Sun Aug 04, 2019 9:36 am
If I remember correctly, one side of the bulb in the sunroof controls gets a constant +12V and the switch connects/disconnects the other side of the bulb to ground.
I looked at mine, and I did NOT remember correctly
The sunroof control bulb gets a constant ground, nad the switch connects/disconnects +12V
I can think of a couple of ways to get the sunroof light to work as a dome light.
The first way is the easiest. Tap into the dome light ground coming off the dimmer switch, and run a wire from it up behind the driver a pillar trim to the sunroof controls. Cut the wire that provides ground to the sunroof light, and connect it up to the wire from the dimmer. This would result in the sunroof light working as a dome light, but would only work when the sunroof light switch was pressed (on). You would lose the ability to turn the sunroof light on independently of the other dome lights.
A variant of this would be to add a switch in one of the blanks by the dimmer to switch the new wire running to the sunroof light between the dome ground from the dimmer, or a constant ground, that would allow selecting the sunroof light to be either auto dome or just normal manual select. Probably not worth it
It should also be possible to have the sunroof light switch work as normal and also have the sunroof light come on with the dome lights, but in addition to running a wire for the dome light ground, you'd also have to pop the pins out of the connector on the sunroof control module to swap polarity so the switch switches ground instead of +12V, nad possibly add some diodes so that hitting the sunroof light switch wouldn't turn on all the dome lights. I don't know if its worth it, guess it depends on how often you want to turn on just the sunroof light when turning on all the domes would be undesirable
Here's where I picked up the dome ground from the back of the dimmer switch. You wan to splice the new wire in addition, not cut the wire. You still want it to go where it used to go, but also now to the new place as well.