the diagram is helpful... 
	http://wagoneers.com/XJ/tech/90-cruise-chrysler.jpg

pin 4 is ground pin 3 is power via brake switch...  I can see the orientation
of the connector as well... leaves 2 pins undetermined... 

whether they are accel decel function...

pin 2 and 1 are inputs from the computer and going to be accel or decel...

JEEP		function		GMC			XJ
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orange		GROUND			Black			pin 4 - black
dark red	Accel Power		Green			pin 1 or 2
white		Decel Power		Dark Blue 		pin 1 or 2

Gray		Potentiometer 1		Light Blue  		n/a
Tan		Potentiometer 2		Tan  			n/a

?		POWER via Brake switch  ?			pin 3 - dk blue/red


http://wagoneers.com/FSJ/Omega/TECH-INFO/cruise-crossover-jeep-gmc.txt
http://wagoneers.com/XJ/tech/93-shop/WIRING_2.pdf

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