Gotcha, if the factory alarm and disarm wires aren't present then you can disregard those. The locks should function fine in the door harness and no need to mess with isolating them. For ground I use a ring terminal and self tapping screw (very short) in the kick panel with a star washer...
If the locks are cycling really fast it may be a ground issue and its trying to rob the ground from another source that can't support the load. I've had that happen if a ground comes loose. Makes sure its to bear metal on the body, not a bracket.
For the not remote starting part, try to relear the tach signal by starting it with the key then holding down the valet button untill the light on the 4105 comes on and release valet and shut off the car.
You can program the horn to honk or not. If you hold down the lock button it should sound the horn that'll let you know if it's hooked up right.
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Make sure the black/white from 4105 is grounded. Make sure the brown wire is connected to the brake or disconnect it to verify. I'd disconnect the grey wire for the 4105.
Basically the only things that can prevent it from starting are.
1: Hood pin is seeing ground.
2: Brake is activated
3...
When you try to start it and it fails do the lights flash. If they do count how many times. That's a shut down diagnostic.
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Accessory output goes to blue/red in the ignition harness. The 4 pin satellite harness you won't need at all for your application.
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Yes, it is awkward, the tilted screen makes it better. The other nice feature of carplay/android-auto is text-to-voice and voice-to-text for messages which is pretty easy to use. I also like having full control over Pandora and my music you don't usually have through Bluetooth.
Not a problem, if you do have the factory alarm disarm wires present, I would run the green/black from the 4105 to keysense wire and unlock wire to unlock. Otherwise your truck will unlock whenever you remote start it.
When I have access to directechs at work tomorrow I'll cross reference for ya but yes that all sounds right, there are a few wires in there you wont need for the 4105.
Reverse Light WHITE/BLUE (+) AT SWITCH ON TRANSMISSION
Trunk Pin Switch BLUE/WHITE (-) AT SWITCH IN REAR DOOR
*wouldn't need...