3ss D.I.C. in a 2007/2008 1ss (Driver Information Center)
This is one of the easier projects, in my opinion. It's made intentionally difficult my GM, In the respect that you only need 4 wires to the instrument cluster, and they completely omit them in the 1ss dash harness. Fortuntely, those 4 wires is all you need, no programming or activation, the feature is sitting in your dash cluster, dormant, waiting for you to wake it up. So let's do this!
DISCLAIMER: I am working from memory, so I can't remember all the wire colors and such, if I open my dash, I will update this document to be more concise. YOU WILL NEED a basic Ohmmeter to perform this installation. I am available on Facebook for questions (www.facebook.com/timthegod <-- It's supposed to be ironic) As always, if you break your truck, I'm not responsible. If you are not handy, get a friend to help you who is.
a straight pick or a cut-off wire coathanger (to release the airbag)
Correct size socket to unbolt steering wheel (like I said, going from memory here)
Philips screwdriver (#2 to be specific)
some 16-18 gauge wire, I suggest 4 pieces, about 2 foot each, 4 different colors (Can be shorter)
Crimp tool and butt crimps (or however you want to connect, solder/shrink, etc)
There is likely more, be prepared..
Parts needed from a donor TB (LTZ) or TBSS 3ss:: (This is absolutely accurate)
The steering wheel from a TBSS 3ss/LTZ (Or an aftermarket with buttons)
The clock spring (pictured above) which is attatched to the steering wheel (You need to completely disassemble the column and cut the clock-spring harness at the very bottom of the column, keeping as much wire as possible.
The harness and plug from the instrument cluster, just cut as long as possible, take the whole thing, who cares, right?)
Review this entire document before you get started, it's to install buttons to activate the DIC, but you want the functioning buttons in the steering whel anyways, right? All the connection points are 100% correct (Note: This is NOT my document, I have linked to it without asking permission, so the link may go dead.. http://www.tbmsport.com/images/DIC_install.pdf
So, following the linked document, you need to extract 4 pins from the scavanged harness by disassembling the old connector, extract any 4, Diassemble the new one, install 1 wire into each: A8, A9, A10, A11. They are for:: A8=Fuel, A9=Custom, A10=Trip, A11=Select. Extend those 4 wires straight down to the base of the steering column, put the dash back in, but leave the outer cover off. Start the truck and test each wire by touching them to any ground, you should see the display change with each.
Now you can see the feature works, super.Take the key back out of the ignition (as long as you do not turn on the ignition, the entire airbag system is disabled, you DO NOT NEED TO DISCONNECT THE BATTERY), I don't care what your buddy told you, don't pull the battery, it's a waste of time.
Start with the steering wheel CENTERED on both the donor and your truck, the clock spring is designed to turn only 2 full turns in either direction from center, the TBSS lock-to-lock is 1 and 1/2 turns either way, so you better do it right. this thing is delecate, you can carefully rewind/unwind and count your way back to centered, but be extremely gentle!
OK, now go ahead and stick a pick/coat hanger into the holes in each side of the steering wheel, just behind the airbag, to release it. Carefully remove the retainer clip holding the connections onto the airbag (SAVE THEM!!!) now disconnect the wires from the airbag, set aside. There is a little white post with a wire coming out of it, that's the horn wire, twist it 45° and give a little tug, and it pops out. Grab a socket, Extention and a wratchet, (I use an impact) and get the nut off. You should now be able to "wiggle" the steering wheel back and fourth and it will pop off. Set this on your shop shelf to admire for years to come. Now, disassemble the column, all screws out the bottom, tilt it down, separate the clamshell (carefully) and set both halves aside. Disconnect the old clock spring from the airbag wire and remove the spring, throw it away after all is done. Now, install the new 3SS spring, plug in the airbag wires (same exact plug) and run the new harness down to the bottom of the column. The new wires are as follows (I think...) 1 Ground wire (which I believe is black) which simply needs to be attached to ground. 4 DIC wires (1 goes from each button) 2 illumination wires (This is a grey area, I hooked mine up but I relamped to LED, you may need to trace this out with an ohmmeter) 2 Control wires for the radio (each button provides a different resistance value, which is output on these 2 wires ( 1 wire is reference, the other is output), this should be pretty easy to connect to a radio interface, but I havent done it yet, I will update soon as the new stereo is happening after xmas) The harness should be plenty long for you to reassemble the 2 column covers and still get to them, so do that, install new steering wheel and nut (tight) put the horn connection back in (with 1/4 turn left) connect the remaining harness for the buttons and the airbag wires (reinstall those little retainer clips or you will have problems with the airbag connection) reinstall airbag into wheel.
Using your ohmmeter (on continuity) with 1 lead on the ground wire, put the other on each wire, find the 4 wires related to each function button, connect them to the 4 wires going to the DIC appropriately, Turn on ignition and test all, (If any airbag lights come on, recheck all connections (especially the back of the airbag) Start vehicle and confirm all buttons are working and no error lights. Reassemble bottom of dash and dash cover. Enjoy!