Update:

I'm still determined to track this down or at least have some kind of work around to disable the REST function that is stuck on. I did find that if I pull fuse 37 and put it back in, REST turns off but as soon as I run the car and shut it off it turns back on. 😑

I installed the new blower motor resistor but there was no change. Same REST battery drain and a new issue popped up from pulling fuse 15. My heat stayed on because the duo value default position is open. To got around this, I opened up the duo valve and moved the springs that keep the valves open by default from the bottom to the top so it pushes the valve down/closed position instead of up/open. Keep in mind I'm leaving fuse 15 out, no power to the valve at all. (credit random Mercedes forum for the idea). Yes, it disables the heater but I need AC most of the year here in FL.

My remaining drain kills the battery in about a day. When the car is off I still have 1.8v going to the blower motor resistor plug middle pin\wire. I think it's going to come down to the AC Heater control being bad but there still have to be something that provides that 1.8v to run the blower and know when it should shut off after 30min or the battery drains.

Anyway, I'll keep at it.!!!

Other stuff I've done...

- disabled the TPMS (Tire Pressure Monitoring System) warning light
- Installed LED bulbs in overhead light, trunk, marker lights, fog lights, running lights in headlight corners, glove box and tag lights.
- painted trim around the windshield, wheels and calipers matte black ( I use Dupli-color Engine paint enamel with ceramic, awesome paint very forgiving and easy to fix if you screw up.)
- Chrysler logo on my center caps were dark brown/yellow from weather. I could hardly see the logo. I discovered that if you heat it up for a short time with a lighter (maybe 3 or 4 seconds) you can peel the outer clear rubber off and the aluminum logo underneath looks like new again.
- stopped the hatch noise with electrical tape.
- unplugged the alarm siren
- replaced the power seat relay
- replaced the battery
- cleaned the leaves out from under the cowl, replaced the seals around the wipers to fill the gap
- replaced the cabin air filter
- removed the spring from the ashtray so it stays in.