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The easy way is to open the dash panel that has the heater control/cig lighters. It's also the easiest panel to remove. You will also have to remove the 3 screws along the upper seam to the upper panel. These are all 3/32 Allen.
On the floor, under a whale of a pile of wires and probably slightly toward the back (that is closest to windshield) you'll find this box. It may be Velcro to the TripTek and or XM/Sirius boxes if you have them.
A lot times I have found the RCA connectors seem to get flaky and simply giving them all a little twist-n-shove makes everything work again. I've had to do this a couple times.
Careful when tightening the dash screws back in, they don't need to be tight at all, or you can crack the plastic. BTW they are standard "button head" 8-32, the problem is finding the speednuts, NAPA 665-3289 seem to work best. You can "rebuild" any broken plastic speednut mounting tabs using epoxy putty and redrilling the screw hole through the epoxy.
There are also some RCA connector splices mid-wire on the wires going TO the LCD, some funky looking connectors that might need a twist-n-tighten. These are toward your upper left of the opening buried in the huge bundle of wires heading toward the speedometer.
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