I know that there is the problem with the mileage... the BCM holds the mileage as does the DIC. If you just switch, you (probably) won't have them match anymore. So, here's my idea which I need some confirmation on.

If I were to get a second wiring harness from a wrecked 04+ could I splice the two connectors together in the dash and then plug both of the units in and increas mileage on both DICs? I'm pretty sure that the 05 uses the Class II data bus. Is that just a digital signal? As in, it doesn't use any voltage spikes that splicing 2 in would diminish right?

If I were to just get some Cat 5 networking cable and splice together 2 plugs and hide the original computer "guts" in behind the dash then I could have all the functionality of the 5 button but then if/when I need to take it somewhere that they would care about the miles, I can just swap the guts back and forth so the display shows the correct miles again?

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That sounds doable, i think, but would want to see the wiring diagrams for each to be sure of that. the class II data is a common bus signal, so it really wouldnt matter if you added another 'leg' to the circuit.

I would use a lil thicker wire than cat5 it is a lil' smaller than our stock wiring. But all in all it sounds very doable, like Toasty said.

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Steven Oliver
2004 GTP comp-g WS6. Gator and suede all around interior.
Advanced MECP certified installer, custom upholsterer.

yeah, that is a good point... i had thought that in my head, but didnt type it :P


how many wires are on the harness for the DIC that you are going to splice? i'm assuming more than 4. if there were only 4, you might be able to stick with the CAT5, but use 2 wires per (since there are 4 pair in the CAT5)

ehh, 18 guage primary wire is only like 4 bux at best buy, or pretty much any place that sells car audio, for a pack of 5 colors with 5 foot each, so that is just what I would get. That might be easiest for me though, since I strip the ends off of primary wire about 5 million times a day ad splice it.

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Steven Oliver
2004 GTP comp-g WS6. Gator and suede all around interior.
Advanced MECP certified installer, custom upholsterer.

I think i'm going to try it. How would you do your splice in this case? Cut and solder wires together into branches or some sort of clip on splice?

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I almost never use clip on splices or vampire splices as they are known, in fact there is debate that those actually hurt your wiring. I use bellcaps at work, because it is mandatory, on everything except alarm/remote starts, but they do work fine; I personally like to use the same way backinblack uses, been using that forever w/o any problems.
Tapping and splicing wires

I solder the splice then tape it up, and backinblack reccomends that on his site, but just incase you dont see that I thought I would tell you.

To answer your question I would do it in branches.

Backinblack, hope you aren't mad I used your site as a reference.
-steven-

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Steven Oliver
2004 GTP comp-g WS6. Gator and suede all around interior.
Advanced MECP certified installer, custom upholsterer.

do you have access to the wiring diagrams/connector views for your car?


if you can get the connector part numbers, we can look and see if you can get the mating connector so you can make a Y harness that is plug and play, no splicing.

that would be awesome. I do have access to some wiring diagrams. When I get home on Friday, I'll look them up unless someone else out there has them available sooner for me

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Good thinking brother.

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Steven Oliver
2004 GTP comp-g WS6. Gator and suede all around interior.
Advanced MECP certified installer, custom upholsterer.