NAV and 6 disk changer in a Silverado

linda · April 10, 2004

correct Mike, that harness is the "SLAVE" harness cable thats the same for all GM slave devices since 1998-2002, so we have to modify it a bit to work for us. What you do is plug the one end into your slave device (6 cd changer) then use the fancy "PINOUT" document that I made, to hook the other end to the head unit. The other end needs to have the pins pulled out of the connector and inserted in their correct spots in the 12 way harness on the back of your head unit. The 24 way harness is your main, that includes speaker outs, data bus, voltage, etc. The 12 way harness is your "AUX" input, its used for OnStar, slave devices, and i think thats where XM would tie in also, but im not sure about that one yet. Im still looking for info on the XM hookup. My truck being a Silverado, does not even have an option from the factory for a 6 disk changer in the console. So NO, i had no harness for the changer, just was lucky enough to fall in good with a few guys who gave me pinouts and schematics so i could create my own harness.

masterp2 · April 10, 2004

Poonis try pac-audio.com. http://www.go2pac.com/oem1kits/aoemresults...for+AOEM-1+kits

Also this retailer

http://www.audiowarehouse.peachhost.com/ct...PR179809543.htm

This harness captures up to 4 channels for additional amplification.

Michael

masterp2 · April 10, 2004

Linda, is this the same HU you had, or did you have the changer HU? This is a CD changer control head, agreed? It is the same head I have in a 04 2500HD. It is also the exact same HU in the Denali, that has the seperate 6 disc in-dash unit. Why wouldn't the harness be a straight across plug into the HU, like a Denali factory settup?

Poonis, do you have factory XM or DVD? Anything in this changer install other than just plugging in the new harness?

Michael

linda · April 11, 2004

Mike, the problem with the 03' and newer radios is they use a data bus (LAN) for controling functions. Functions such as "track skip", "NEXT CD", "fast forward", "volume", and pretty much all the steering wheel functions are executed through the data bus wire. 2002 and older do not use this type of communication. The 2003 changers use 6 wires: (even though there are 9 in the wire harness)

1. +voltage

2. ground

3. audio right +

4. audio left +

5 audio common (-)

6 Data bus

Now, only the audio wires tie into the "AUX" harness, the rest are intertwined into the main radio harness to pick up the voltage, ground and data bus wires. So you can see that a straight through harness is not possible anymore. Even the Denali, if you were to trace out the wires in the slave harness, you would see its not a straight through connection anymore.

Also, poonis did not just plug in a new harness to get this changer working, i showed him the document to follow for the soldering of the voltage wires and data bus wire. Ask him about his install.

Yes, that IS a CD changer control head so to speak. In the sense that it has the ability to have a slave unit hooked to it. The difference is, like i explained above, you cant utilize a direct connection to this cd changer anymore via the old direct connect harness. The BCM has to recognize the changer now, through the data bus system. My HU was a 6 cd changer head unit, which is incapable of controling a slave device. The BCM is now in charge of all the goings on in the cabin of your truck, this means door chimes, radio, fog lights, high beams, AMP, slave devices, and a bunch more im not mentioning. The hook up for the 2003 slave device is fairly simple, it just requires tapping into the voltage wires and the data bus wire now, where before, you didnt have to do this. I hope this made a little sense, i seem to have difficulty describing what im trying to say sometimes.

poonis · April 11, 2004

Also, poonis did not just plug in a new harness to get this changer working, i showed him the document to follow for the soldering of the voltage wires and data bus wire. Ask him about his install.

Michael, thanks for the info on PAC.

The cd changer installed in my car, I had to solder three wires to one hu harness and plug three more into the second hu harness from the aux harness. And I wouldn't have been able to figure this out without help from Linda. I tried directly connecting the cd changer harness into the hu, but I wasn't able to purchase or find such harness. I tried several GMC dealers to get the Denali harness and they couldn't find the part. I even got a Denali VIN number and told (actually lied) to the dealer that I needed for my Deanli and they told me the same. I also contected several internet GMC part sellers and I was once again told such harness did not exist. I guess GM want's to keep the cd changer to Denali's and Escalade's.

But, with help from Linda, the install was practically easy as just connecting two harness together. Not to mention making sure I had the correct cd changer. I bought my changer from eBay before I knew that it's almost impossible to buy the orignal Denali cd changer harness. So, I just lucky to be a member of this forum. Besides looking at the part number, it looks like the 03 cd changers have metal tabs on the side and the 02 cd changers have plastic guides on the side.

By the way, I don't have the factory DVD. I do have XM but it's not activated.

masterp2 · April 11, 2004

Crazy, man, crazy.

Linda, do all your steering wheel controls work as they did stock? Can you "navigate" with them?

linda · April 11, 2004

yup, everything works like a charm. All controls for the changer and NAV work perfectly through the steering wheel controls just as they would if they came from the factory like this. You would never know this was added after the fact, if you didnt know Silverado's didnt come with the NAV and changer.

poonis · April 11, 2004

all my steering controls work flawlessly too.

masterp2 · April 12, 2004

So what are your thoughts on replacing speakers? Those bose drivers usually have the build quality of paper airplanes. Do you think that quality components would provide another margin of improvement?

linda · April 12, 2004

i would say most definately......but you need to pick up something that has a relatively low RMS rating....otherwise the BOSE AMP wont be enough to power them. It would make a positive sound improvement im sure.

crookedpat · April 14, 2004

So does the nav unit have to be in the Sierra Denali for the dealer to reprogram it?

Ive got everything i need expect for putiing it into the truck.

linda · April 14, 2004

all the programming does is tweak the sound a bit....i have found that there is not that much of a noticable difference. I would install it and just let it go without the programming. You have everything?

1. head unit (radio)

2. AMP (upgrade AMP)

3. antenna

4. Microphone (not really needed)

5. AMP harness wiring switched out?

6. VSS wire from your instrument cluster ran to the HU

7. class II data wire hooked up?

I see you have the sierra denali, so that MAY come with the correct AMP for the NAV. If thats the case, you can eliminate having to do 2,4,5,7. Check your glove compartment sticker for the RPO "Y91" option to see if you have the correct AMP.

rgardjr · April 15, 2004

I see you have the sierra denali, so that MAY come with the correct AMP for the NAV. If thats the case, you can eliminate having to do 2,4,5,7. Check your glove compartment sticker for the RPO "Y91" option to see if you have the correct AMP.

I think he was asking about reprogramming the headunit for the theftlock. I know that my '03 Sierra Denali has a different amp than my cousin's '03 Silverado-we both tried to install the PAC C2A-GM24 worked in my truck and not in his. When I talked to PAC the explanation I got was that the trucks had different amps.

masterp2 · April 15, 2004

For those interested. Found the Nav HU distributor selling these for $1245 shipped, NEW. Better than EBAY. (800) 433-9657. The other parts you have to get thru GM.