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Originally Posted by JC327
The module is somehow connected to the airbag system, and it also emulates the switched (accessory) power circuit to the radio. Not using the module can also cause problems with the on-board diagnostic system.
If you try to hook an aftermarket radio directly to the wiring harness, it will not turn on as there is no actual accessory power there. The sytem can be rigged to work by running your own accessory power to the aftermarket unit, but as the other problems will still be there, it is not advisable to do so.
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Well I decided to take a shot at this without a bypass module just to see what would happen. After removing the stock headunit I noticed absolutely no change in the vehicle. Passes all startup checks, including airbag. Even the door chime still plays. I still would like to know where it is so I can unplug it.
So I decided to put in the new headunit. Alpine CDA-9857. Worked perfectly. The wire marked for accessory power on the cable harness I bought is a switched +12V line. So the stock wiring does bring accessory power to the headunit.
As this is the first time I've replaced a car stereo it took me all weekend, but my new stereo and speakers are installed and working perfectly. I didn't require a bypass module or have to find an accessory power line.
I also have an OBD-II connector (
www.autoenginuity.com). It's able to connect to the vehicle perfectly with the new stereo installed and finds no problems.
Thanks for the advice.