Interfaces for GM Steering Wheel Controls.
[ SWC Home | Home ]
Update on interfaces for these Steering Wheel Controls
I have just finished decoding the remote control codes for most of the Pioneer car stereo functions. I am currently looking for folks who have other brands of products and are willing to give up their remote for a while so I can decode more brands of stereos. If you can help me out, please let me know! Also, as I said in my 1st generation page, the serial data stream has been decoded for the 1st generation SWC's also. So, a design for a 1st generation to Pioneer interface is in the works as is a 3rd generation to Pioneer interface. The 2nd generation to Pioneer interface is also in the works, but will require replacing internal parts of the SWC pad. The 1st and 3rd generation interface will plug directly into the output from the factory pad.
I plan on having two models available. The first model will require the Pioneer radio to be slightly modified to allow direct input from the rear of the radio from my interface. The second model will have a infared LED that you mount in the interior and point towards the face of the radio. This allows control of the radio without internal modifications. The interface will match as closely as possible to the legends on the face of the buttons in the SWC pad; so that VOL UP makes the volume go up and MUTE will attenuate the audio.
When will it be available?
I plan on having an interface available by Christmas. If you are interested in helping me out by using one of the "prototypes", please let me know. I may have other brands decoded by then also and included in the prototypes. Hang in there! The 2nd generation model will take longer. I have decided to not decode the E&C bus data stream as it is a bi-directional bus and from the decoding I have done looks quite complicated. Seems the radio and SWC pad "Talk" to each other so that each knows what the other is doing. For example, if you press the AM FM button on the 2nd gen SWC pad, the SWC pad microprocessor already knows the radio is in the "AM" mode by previous communication. So, the SWC pad sends out the command "FM" to the radio. The radio switches to the FM band and lets the SWC pad know that it is in the "FM" mode so the next time you press the AM FM button on the pad, the pad will send out the "AM" command. It would take too long to fully decode this system (by myself.) I am simply going to replace the microprocessor board in the pad with one of my own design and output commands directly onto the E&C bus. Since my commands are not understood by the E&C bus, the components hooked up to the bus will just ignore the data (I hope!) In cars with the climate control system hooked up to the E&C bus, I will still use the factory controller board and just use my controller board to give the factory board the key presses required for climate control functions. Therefore, the climate control will still work and you can hook-up aftermarket stereos to the 2nd generation system.
Send mail to the Webmaster [email protected]
with questions or
comments about this web site.
Copyright © 1998 by Carl Miles
Last modified: September 16, 1998
This page has been visited 
times since 9/16/98! Thanks!
This page hosted by 
Get your own Free Homepage