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Generally speaking, the module is mounted on the side of the block and the coils are mounted to the module. You can remove the entire assembly and then swap the coils over to the new module. There should be a wiring harness plugged into the end of the module.
this is a common problem and the dash cluster must be removed and sent out for repair, cost is about $175 to replace the LED (Light emitting diode) display that has burned out, this is a faxtory defect as far as this expert is concerned, it is not a fuse problem.
it has a digatal egr valve remove the egr valve and lean it with top engine cleaner from GM, with a tooth brush, then test the stepper motor with an ohm meter if it mesures more than 6 ohms replace it.
you should not have to remove the dash to install a new radio all you have to do is remove the trim around the radio and then take out the bolts that hold the radio in and remove the wires from the back and also if there is a Walmart or Radio Shack near you get an installation kit and you plug it from the plugs from your old radio and it is alot easier to wire it that way