How-to: 5 button DIC upgrade (no reprogram necessary)
Introduction:
This method of upgrading to the 5 button DIC on 04+ GP will ensure that the mileage stumbling block isn’t an issue anymore. This method leaves the original 3 button DIC installed also so the miles continue to count up while you still get the use of the 5 button DIC. If you need service at a dealership or for inspection, etc. Simply re-install the 3 button and the mileage will still be correct between the DIC and BCM. Keep in mind, tampering with the miles is considered fraud. I am not responsible for your actions. This how-to simply explains how to stay legal and still upgrade the DIC without the need to have anything sent away for days to be reprogrammed. Another note: if you have the HUD installed and both DICs, you may find that the temp reading on the HUD will be incorrect when you first turn the car on. After a few seconds, it will correct itself and display the correct temp. You may be able to not plug the pin A into the 3 button DIC and correct this issue but I have not confirmed this as it doesn’t really bother me. 
Procedure:
1. Pull toward the rear of the car at the bottom of the DIC Trim panel. The panel pops off. Catch the ignition trim when it pops off also.
2. Unplug the DIC (and airbag notice if equipped) from the trim panel
3. Remove the DIC from the trim panel. (4 screws, 2 philips, 2 torx screws)
4. Looking at the end of the DIC connector in the dash, the pins are labeled A-M. The bottom row (side away from the connector secure clip) on the left as Pin A, the right side is pin F. The top row on the left is Pin M and the right side is pin G.
5. Cut the Male plug off of the GMCELL harness about in the middle and pull the insulator cover off of the wires.
6. The male side of the GMCELL plug has wires in it that won’t be used and others you will need to replace. Depending on the version of the GMCell the wire colors may be different but the pins you are concerned with will remain the same. The GMCELL will be missing 3 pins which would be used for cell +/- and mute functions. You can either remove the extra pins from the connector or just cut the wires off, either way, you need to make sure you have a length of wire coming out of the following pin locations: (you’ll need to remove the pin retainers in order to insert the new pins)
Pin Location : Function : Color in picture
A : Ambient Air Temperature Sensor Signal : Red
B : Compass Data Signal : Purple/Black
C : Compass Clock Signal : Green
F : Ground : Orange
G : Low Reference : Purple
L : Battery Positive Voltage : Yellow
M : Trip Computer Class 2 Serial Data : Blue 7. Next the other end of the wires need to be connected. Splice the female end of the wires with the male end and an extra length of wire (about 8 to 10 inches long) together and use either solder or a wiring nut to hold them together. Essentially you are making a “Y” connector. There will be 3 wires coming out of each wire nut, one to the male end of the GMCELL connector, one to the female GMCELL connector and another length of wire to be used in a moment. Make sure that the wires carry through properly when you splice them together. If you were to plug the male and female connectors into each other, they should make a full loop for each pin.
** The colors won’t necessarily match up as the GMCELL does cross pins between the male and female ends.** 8. Crimp one of the female pin ends (pin receptors) onto the end of the extra lengths of wire (all 7 wires) 
9. Insert the pins into the extra female connector like they are in the end of the GMCELL female connector (the two connectors should be identical when you are finished) (remember, your colors may change... this is just what I had around) 10. Put the pin retainers into the female connector to ensure that the wires stay connected securely
11. Make sure you have the pins running between the 3 connectors correctly and use some electrical tape to keep the bundle together 
12. Wiring harness complete.
13. CAREFULLY, open up your 3 button DIC. Start with the clips on the top (2 next to each other) and slowly work around until it separates into the 2 halves
14. Pull the plug for the button daughter board off. You should have the display board by itself now.
15. Plug the long end of the harness made earlier onto the back of the 3 button DIC display board and the other end into the 5 button DIC
16. Hide the old 3 button display in the space above the center vent inside the dash 
17. Using the template provided, mark the DIC trim panel for the extra 2 holes.
a. If you cut out all 5 holes, line them up and trace them onto the trim panel. If you only cut out the 3 holes, you can just use a pin to mark the center of the outer holes for drilling 18. Use the drill to make the extra holes
a. If you look at the hole on the left, you’ll see 4 markes around the outside. If you connect these lines, they will form 2 diameters that cross in the center of the hole.
b. You can use a piece of paper with a straight edge between the two points and a utility/razor knife to mark each diameter.
c. Where the two inscribed lines cross is the center of your circle. Use a nail or push pin to mark the center for where you will drill.
d. If you use the graduated drill bit, you can get the same recessed look that the other holes have fairly easily.
19. Mount the 5 button DIC back to the trim panel
20. Reinstall the trim panel
21. Plug the Temp sensor into the green plug behind the passenger side headlight and clip the plug into the hole in the shroud behind the bumper
22. Plug the compass module into the harness under the rear package tray (optional) | 
