Auxiliary Input via Slave Cassette for OEM Delco Radio

A how to tutorial to tap into the audio channels from a slave cd/cassette player and allow auxiliary audio sources to play over factory radio. This mod also includes a way to disable the slave unit (cassette) from playing while playing from the auxiliary source.
This information pertains to GMC/Chevy full size New Body Style (NBS) vehicles from around years 1999 to 2002. Sierra, Silverado, possibly Tahoe/Yukon with the center floor console and a slave unit, either cassette or CD player.
Modify at your own risk. It is a good idea to disconnect the battery when servicing your vehicle and especially electrical items. I take no responsibility for your actions and make no guarantees of the accuracy of the information provided.
How to remove the front section of center floor console video here: • 99-02 Silverado Sierra...
Demo song used in this video. All rights reserved by their respective owners.
Artist: Trakktor
Song: The End of Days
EP: Maximum Overkill
Follow my entire truck history/blog/modding at SilveradoSierra.com,
www.silverados...

[@Project_Recovery]

Can a 5 pin 3.5mm jack be used and ditch the whole cassette player? I would guess orange and pink would be on the switch side of the jack so the pink signal wire is hot when an input cord is plugged in.

[@silentbravo]

I don't know, I never delved further into it what it would take to trick the radio further into thinking the cassette player was on and playing. That would have been much slicker to bypass and delete the whole player.

[@charlesbailes2410]

Did you add the steering wheel volume controls to your Sierra 2500?

[@silentbravo]

Yes I did, I have a video of the install like 90% edited that I need to finish and post someday....

[@123clis321]

Gave me some clues! Thank you. I dont have a cassette, but I can run the audio path and then use a switch to trigger the voltage signal to "see" the cassette player I dont have. Ideally i can do all that through a 3.5 with a built in switch, and wire a small chip amp to boost signal.

[@silentbravo]

If you get it to work that way I'd be interested to see a video on it

[@reeseferrell2731]

i know you sent this a very very long time ago but do you still remember how you did it? im trying to do what you said you did.

[@noblsht]

I did buy a amplifier for a 92 Chevrolet Silverado which which had an auxiliary plug soldered in here is a video showing where the solder connections need to be made>>>> search on KZbin for>>>> "1988 through 1993 Chevrolet Silverado adding auxiliary jack to radio amplifier"

[@autumnjeserich2689]

I want to figure out how to use the circuit board from the cassette slave to give the signal to override having to use a switch or have a cassette play. Thank you for this video, I picked up a 10 dollar cassette slave off ebay to mimic this setup, I just had to get rid of my long disabled onstar. I got an 02 sierra 2500HD and I love that truck to death but I'm working on a tight budget.

[@silentbravo]

Yep I was on tight budget as well when I went after this one. It would be nice to take it down to the circuit board level to get rid of the bulk of the cassette player, but I'm not smart enough to figure that out. I did remove the guts from the case and built a tighter enclosure to save some space though.

[@hectora.garcia4229]

if the other cables apart from the jack are not connected, can it work? or is there any way of the other cables spliced ​​with the other stereo harness?

[@silentbravo]

Well the cassette deck has to actually work and communicate with the stereo head unit just for a few seconds, then it can be disabled/turned off and the audio input can still be used. The head unit doesn't realize the cassette audio has changed or anything. So I think most or all of the other harness wires have to be connected, otherwise the cassette deck won't work right. There may be ways to do this mod or something similar inside of the of stereo head unit itself, without the cassette deck, and there are resources on the internet that show how to do that. I actually had tried that myself, but I couldn't get my particular model to work with those mods.

[@byronraines187]

I have after market cd player and I want to use my stock cd changer will that work the same way

[@silentbravo]

No it wouldn't. The wiring harness I am modifying to tap into the audio channels comes from the stock head unit, and goes to the slave cassette unit. Your aftermarket HU almost certainly won't connect to the slave cassette unit. There may be some aftermarket wiring harness that will retain auxiliary cd changer, but I don't know about one. There are usually easier/better ways to get a bluetooth signal from aftermarket head units anyway.

[@JustAnotherAlchemist]

I need the pin out info for a very similar unit, only with a 7-pin slave input instead of 9. They make 'em! I got one in my hands right now. Can't seem to find the wiring schematic/pinout to save my life. Would be a 5 minute job if I had the pinout...

[@silentbravo]

Go to www.bbbind.com/tsb-and-wiring-diagrams-login/ and make an account, you can download just about any wiring diagram for any vehicle there. I got most of my trucks wiring diagrams there

[@h34dsh007er]

Put a cap on the pink wire to delay it's break

[@silentbravo]

Why?

[@miusername6082]

I'm no electrical engineer by any means. But, maybe he's meaning to use a capacitor to essentially cause a delay in current through the pink wire. What I'm now wondering is, if it's a capacitor that's needed, or a inductor?🤔

[@TRUTH4U2NO]

Easier to buy a adaptor kit on Amazon.

[@silentbravo]

I agree. Easier but more costly. Frankly you could buy a whole new single DIN head unit and the bezel adapter for fairly cheap as well and have all sorts of features.

[@adbyrd29]

Which adapter kit can you send a link

[@gabee4497]

It's too bad you can't buy braging rights on Amazon!

[@Noneya.]

Link?