2006 Chev Express van 2500 radio swap .

Is it repeatable? Every time it is disconnected it runs bad, but runs right every time you reconnect it?

If so, I don't know if you can jump the data line wires to bypass the radio. I know the PCM and BCM look for all of the modules, and funny/unpredictable things can happen if they are not all found. I spent at least a week trying to find a sporadic dead battery problem on a car with an aftermarket radio. The service writer lied to me, and told me that the problem had been there before the radio was replaced. I should have known better.

Might need to research something like this: LC-GMRC-LAN-01

Sort of. The "radio" in many newer vehicles does a lot more than play music. They also act as a sort of RAM memory for other systems as well. The LAN is used to read/write that memory and it plays a part in the security system, ECM data stream and things like memory seats and mirrors. It's why I cautioned you about it. Being that is a base radio in a work van I hoped it wasn't connected. BUT I should know better by now.

On Wednesday, August 23, 2017 at 2:31:35 PM UTC-4, snipped-for-privacy@gmail.com w rote:

nit with a cassette in it's place. Mechanically this is going to work howev er when I last discussed this in this group Steve advised me to first see i f the truck would run properly with the radio disconnected. Well interestin gly it won't. It seems that with the radio removed the idle speed is way do wn and it will stall when trying to put it into gear.

mance however I do have a theory. I'm thinking that somehow the data stream which is running through the truck may interlock through every device whic h "talks" to the computer and perhaps pulling the radio plug interrupted th at data that goes to the engine components that control mixture, timing, id le speed, etc?

. But in any case can someone please explain to me what is going on here, a nd if whatever it is can it be circumvented so that I can do away with the stock GM radio and put what I want in there?

I think that I have confirmed that the radio has nothing to do with the eng ine performance.. The strange thing is since that day at the lake when I pu lled the OEM radio and the engine performance went to shit I have attempted to duplicate that event countless times during the course of this installa tion both by first pulling the battery and then not pulling the battery.and the engine has not acted up since. So what caused it that first time and n ever again? Who knows?

The job was a bit of a challenge though both mechanically and electrically. The old radio is slightly smaller than the 2006 OEM radio so there was ple nty of room in the radio space. I cut the wires off the 2006 radio connecto r one by one and spliced them on to the old radio connector. Except for the fact that they changed all the color codes on he speaker wiring,(why they had to do that is beyond me), it was pretty straight forward.

I did confirm though as Steve suggested that there is only constant power t o the newer radio. It doesn't require switched power because pressing the O N button sends a signal to the microprocessor telling it to power on. This is way more sophisticated than they did in 1990. Anyway I looked for a circ uit in the truck that would go to 12 volts when the key is in either the IG N or ACCY position but there was no convenient one. So I installed a lighte d switch between constant 12 volts and the terminal on the old radio that g oes to 12 volts when the key is put in and either run or ACCY is selected. This might seem clumsy, however I actually like this arrangement better tha n the OEM arrangement. Now I can power on the radio regardless as to whethe r the key is on or off or even present,etc.

Thanks for all the help and advice I received on this group with this job. I'm really enjoying my tapes again. Lenny

Thanks for the feedback. Good to know it worked out ok.