Originally Posted by ScoobyDooDodge
I had started a post about doing this to my new '08 Ram. I see that it is possible. Do you know if you can have the RDZ turned on before you do this mod. I don't have my controls yet. I did this to my '05 and it worked great. Thanks to all for working this out for the rest of us.
Yes the dealer can enable the controls before you do the installation. I had my local dealer do it on my truck months before I got the time to tear everything apart and do the install.
They can even verify that the controls are turned on because a harmless error code of will show up on their StarScan computer indicating power to the controls but no feedback (since the switches aren't yet installed and thus indicate an open circuit).
There is a different harness that you should use in the newer trucks. It is part number 56049424AI and it is the actual wiring harness for this install. It allows complete plug and play from the left and right audio and cruise control switches straight to the connector to the clockspring. I then cannibalized the cruise control harness I removed to make the plugs to go from the clockspring to the back of the instrument cluster.
The only disadvantage to using the new steering wheel harness part is that my dealer charged me $237 for the $5 part!
Your milage may vary. The same 56042934AA harness advocated here cost me $154, but has incompatible plugs to the new wiring, especially at the clockspring. The 56049424AI part is the EXACT one that comes up in the parts manual for our era of trucks with both cruise control and audio controls.
Good luck, this is one of my favorite mods on the truck!
#1 (533) Shows the cannibalized original harness going from the clockspring plug. One wire is grounded nearby, the other is spliced and goes to another salvaged piece of wire. This one fits into a specific empty pin spot on the plug assembly that attaches to the back of the instrument cluster.
#2 (523) Shows the part the original harness that was deconstructed with a utility knife and dikes to get the important pins.
#3 (531) Shows me inserting the salvaged wire/pin into the plug assembly that mates with the clockspring harness in the steering column.
#4 (532) This is the assembly that you add a pin to to mate the controls with the CANBUS network in the instrument cluster.
#5 (535) Is the completed and tidied harness that connects with the cluster.
All the pin locations are illustrated in your service manual. If I recall from th photos, (I did this install back in October) the pin nearest the end of the clockspring harness (in my case purple wire) is sent to a convenient ground. I used the chassis of the dash for this. The adjacent one (in my case blue wire) is tapped and extends a sufficient length where it is spliced to (in my case the green) donor wire/pin. This then mates with a slot (3rd one in from top left) shown at the open "box" in the photo in the dark gray plug assembly.