I have a 1996 Seville SLS and I want to put a PC in my car. I want to replace the headunit with a touch screen monitor that I have. I have read that you cannot just take out the headunit as it is needed for some of the other features the car offers. One idea was to move the head unit to the trunk and run a cable from the original location to the trunk. Then the stearing wheel controls would still work. I also read that there is a connection on the back on the unit that would allow for an input device, I was thinking my PC. So if I could find the pinouts for the Radio then I could create the cable to run to the back so I could put the touch screen in the console. Does anyone know where I can get the pinout for my radio and also if there really is a place I could plug an aux input. My radio is just a stock AM/FM/CASS non Bose radio.
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If you retained your steering wheel controls, but moved the HU away, what would they control? Look at the converter modules from www.Pac-Audio.com, they might help you. THey make all different adapters and converters from adding amps to oem radio to replacing oem radio and retaining vehicle function. Also, check Car2PC.com as well.
Also, many times there are thrid-party units that will allow you to remove your HU and retain the functions it used to have. The GMDL is an example. If you take out many GM HU's, you lose the factory chime. Not so if you use the GMDL.
If you get a good answer at some automotive electronics forum, neat-o. Pinouts are only so helpful. But since I'm here...:
Contrary to popular thought, the class two data bus was introduced by GM in 1995 (not 2000'ish). On your particular model, interestingly enough they did something interesting (experimenting, I suppose). There are 2 Data communication busses. If you look at the back of your stereo, you will see part of both of them. They are the two purple wires. One on connector E, pin 6, and one on connector F, pin 6. One of those two wires is part of the class 2 data bus. The other wire is part of a UART (Universal Asynchronous Reciever/Transmitter). Here's the lowdown:
"The Body Control Module (BCM) performs the following functions: HVAC afterblow control, battery guard, door lock and unlock, fuel level for DIC, retained accessory power, theft deterrent, exterior and interior lighting control, trunk release, time of day for radio display, rear defog, fuel door release, and vehicle personalization. Signals that activate the BCM are known as "wake-up" signals. BCM is asleep when it is not controlling or monitoring the following wake-up functions: key in door lock switch, door ajar switches, power door lock switches, trunk ajar switch, trunk tamper switch, ignition on, and ignition accessory (ACC). BCM uses 2 separate data lines, the UART (Universal Asynchronous Receiver/Transmitter) and class 2, to communicate with other system control modules. UART system uses a master and remote transmitter communication process. BCM is the master and controls signals on serial data line by soliciting remote transmitters (system control modules) for information, then waits for correct response. UART remote transmitter control modules include: Electronic Brake and Traction Control Module (EBTCM), Continuously Variable Road Sensing Suspension (CVRSS), Road Sensing Suspension (RSS), and Sensing and Diagnostic Module (SDM). Class 2 system uses a peer-to-peer communication process and is transmitted at a much higher rate than the UART system. Class 2 control modules include: Air Control Module (ACM), Body Control Module (BCM), Cellular Telephone (PHN), Climate Control Panel (CCP), Instrument Panel Cluster (IPC), Integrated Radio Controller (IRC), Powertrain Control Module (PCM), memory seat/memory mirror module, and Remote Function Actuator (RFA). BCM acts as an interpreter for data communication between UART and class 2 to satisfy need for communication of serial data between modules."
I haven't checked all the info on this site for myself but it has some pretty good info on it as far as I've seen.
So it looks like, in your case the steering wheel control communicates with the radio through the class2 bus (via the BCM and possibly UART). The clock thing, possibly some muting with the car's mobile phone setup, You'll probably get an error code if you remove it, but I'm not sure at the moment. If it's important, I could look it up for you. As far as pinouts go....check here.
It's been a while...
Looks like you will get an error code: PZ2255 - Generic Loss of Serial Data (source ID unknown). But it's harmless as far as I can tell. I'd say yank it (no warranty implied) if your trunk-space wasn't so large.
It's been a while...