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Thread: Class 2 Data Bus

  1. #11
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    i don't think its a GM radio, I worked at a pontiac dealership for a while and the vibe radio was different from the rest of the radios there, if anything is a monsoon radio adapted to a toyota, pontiac doesn't always use Bose/Delco radios

  2. #12
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    The radio on the Toyota Matrix is AC/Delco or Delphi radio. This is what it look like.



    Interior:



    This is a typical Toyota Radio on Corolla (The Toyota Matrix is AKA Toyota Corolla Matrix)

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  3. #13
    Maximum Bitrate eugenen's Avatar
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    The shape of the knobs and buttons look Delco/GM but they haven't used LEDs for the display since the 80's, everything since then has been bright white VFD. I can tell class 2 or not from the usual GM radios but have no idea on this one.

  4. #14
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    All S-10 trucks are NOT class 2 databus, even the 2003. GM doesnt use class 2 databus on every car, Only Chevys, Caddilacs, and GMCs. All Saturns, and Geo lines like the Prism dont have class 2 databus eventhough the radio looks like it. I dont even think that Pontiacs and Oldsmobiles are class 2. All class 2 radios will have door chimer built in. If you dont hear the chimer coming from the driver speaker then it's not class 2. I dont think RDS plays any role in class 2 databus.

    On a class 2 databus radio, a single wire (thin orange wire) can do
    01 ignition control. turn the key off and remove the key, the radio continues to play until the door's open.
    02 illumination control. turn on the parking lights and the lights on the radio dims
    03 door chime. GM got rid of the chimer circuit and built it into the radio. All warning chimes come from the driver speaker.
    04 Onstar control. Allows onstar's audio to play through the radio's front speakers and mute the rear speakers
    05 XM control. Allows controlling the GM XM satillite slave receiver. Audio is through the line input of the deck
    06 various vehicle function control and programming. resets low tire pressure warning, oil change service warning, keyless entry programming
    07 VIN number ID. class2 databussed radios are not interchangeable. They have VIN lock on it. You can't pull a radio out of an Impala and stick it in a silverado.
    08 VSS controlled volume. The faster you travel the louder the radio gets.

    The only cars that require relocating the radio are the ones that can control other functions such as Impalas and Monte Carlos.

    You can take the following steps to determine whether you should relocate the radio or can pull it out completely when you're installing a new radio.

    If your factory radio is 1 1/2 DIN 3" high then pull the radio out. If it's double DIN over 4" high then goto next step.

    Place the key in the ignition or turn on your parking lights and put your ear next to the driver speaker. If you dont hear the warning chime coming from the driver door then you can pull the radio out. If you hear the door chime then goto next step

    Press and hold the center button on the lower left knob for 30 seconds. If "SETTING" shows up then you HAVE to relocate the radio elsewhere with a relocation T harness. If "SETTING doesnt appear after hold the button for over a minute then goto next step

    If you don't have Onstar or XM then you can pull the radio out but you will loose the chime. You will have to run an ACC wire to the fuse box or to the ignition wire. If you want to keep the chime you can use PAC part# C2RGM24. It also provides an ACC wire and retains delayed shut off. If you have either or both then goto next step

    If you have Onstar but NO XM, you can replace the factory radio with an aftermarket deck by using PAC part# OS2. If you have BOSE then use OS2-BOSE

    If you have XM and WITH OR WITHOUT Onstar and want to keep the XM then you have keep the radio. You can use the PAC AUX IN adapter # AAI-GM12 and relocate the aftermarket radio elsewhere. You have to use the stock radio for main volume control.

    Class 2 Databus isnt as hard to deal with as some people said. I've never had any problem removing the radio or relocating the radio. I always follow 2 simple rules. 1 never disconnect anything when the ignition's on. 2, never disconnect any yellow plugs or looms then turn the ignition on. It's a good way to make the airbag light to come on and possibly deploy the airbag.

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  5. #15
    Low Bitrate Dr Jeckyl's Avatar
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    my 2000 pontiac bonneville is LED with class 2 databus

  6. #16
    Maximum Bitrate owenjh's Avatar
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    Actually my Cavalier does not have the Class 2 data bus. I was wrong. As it was a low end, the only thing affected by replacing the stock head unit was the chime when I pull my hand brake (has an idiot light but that still works) and light / key chimes. Personally I couldn't care less about my chimes. and wouldn't spend the $70 on the chimer or $50 on a wiring harness.
    If you are looking for a power source for your Aux, just buy a fuse tap, and tap into your wiper fuse, on mine its rated at 20 or 30a. Have never had a problem with this setup, I am not sure if there is even an acc wire on the ignition coil thats why i used the fuse tap.
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  7. #17
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    Sorry to bring this back but will I be able to get one of the newer radios on my 99 monte? i have the 1.5 din unit that has been the standard since 95 or so, and I want the new deck that has the tape deck and CD player combined, but if the radio is VIN activated will i be able to set it for my car?

  8. #18
    Maximum Bitrate owenjh's Avatar
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    Not sure what you are asking, do you want to get a new stereo for your monte carlo? or do you want to just want to upgrade the stock one?
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  9. #19
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    Delco radio commands?

    Hey - I'm wondering if any of you have a command reference for GM's Delco radios, using their Class 2 bus. I'm planning on hacking a computer together to put in my truck, and I'd really like to hook it up through the head unit's CD Changer port. The pinout for the port lists a Class 2 data line, which I assume is how the head unit would communicate with a CD changer (for next track, text display, etc.). Anyway, anyone know where I could find it? I'm planning on calling the dealer because they were rather helpful in handing over the pinouts, but I thought I'd ask here first.

    Thanks!

  10. #20
    Maximum Bitrate eugenen's Avatar
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    I would be surprised if the dealer has the commands, they are all preprogrammed into their tech2. Since the class II is standard OBDII it would seem to me you could build a sniffer/capture program and catch all the commands going around the bus. I'd like to try this someday, everything on my truck is controlled by the class II bus, windows, door locks, A/C, etc are all controlled by it.

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