1999 Montana

Something is wrong with the electrical system. First, the "Lock/Unlock" door
button would not engage. Next the 2 radiator fans fail to run. ( I got the
left fan to run by jumping ground to the front)
Next the ABS and TSC lights came on. Next the "Cruise "control failed. Next
the "Low Coolant" light turned on and stayed on. Finally the "Fuel Guage" stays at "Empty" after engine starts and the "Low Fuel" warning light stays
on.
also...

does anyone knows where the "BCM" is located (body control module).

Has anyone experience such problem and if so, how was it corrected?

Also, is there a way to reset the ABS/TSC (TCS)?

Main electrical system is located on the Passenger side.
Look for a loose main connection. (Thick RED) or Ground.