Pre collision, Land departure and heater not working

Hey guys wondering if someone can please help me with this

recently my heater shut off causing my pre collision light and land departure light to come on. I’m not sure if this is a wiring issue but I took it to the dealer and all they did was reset the computer and the A/C and all sensor were clear. Fast forward a week and the same thing happen. I am completely lost in this and the dealer said the fuses were good and it most likely had to do with my vehicle modifications but just sounds like they do not want to deal with it. My vehicle is lifted and has an arb front bumper and all pro rear bumper and never had an issue. Please any information will help me resolve this issue also the temperature on the dash indicated the weather outside shows the letter “E”

 

Did you do the mods or was it a shop? Have you ruled out rodent damage?

 

Welcome to TW.
Wth is a land departure sensor?

 

That’s a feature is only available on trucks equipped with the submarine package.

 

Yes I did all modifications myself but all mods were bolt on and only required wires to be spliced for the rear lights

 

Ahhhh spliced.........