Need help from car audio experts, 2000 bonneville wiring harness?
I am replacing the factory stereo with a new pioneer head. The problem I am having is which wiring harness I need for the stereo to work. The guys at the store told me I needed the GMRC-04 in order for it to work. The problem is its $100 itself. I found a scosche wiring harness that fits my Bonneville as well for much cheaper. I was wonder, will the cheap on work with all of the steering wheel controls? And also will it work with the delayed shut off after the key is taken out (and doors remain closed)? Will it work just as well as the expensive one? Or will it not function properly?
Here's what's going on:
Your head unit is controlled through the vehicle's data bus system. The GMRC-04 communicates with the vehicle data bus to keep the radio-controlled functions working; it also reads the radio on/off signals and uses them to control an accessory power circuit for the after-market head unit. If you use the GMRC-04, the after-market radio will work with the retained accessory power feature, and the vehicle's warning chimes (which are controlled by the factory radio) will still work.
Now the question is, what Scosche harness do you have? If it doesn't include a separate control box, then it won't work like the GMRC-04. Scosche does make a harness, the GM07B, that fits the factory connector strip, and it will give you the speaker and constant power connections. However, it won't give you retained accessory power, and it won't keep your warning chimes working. To make the after-market radio work at all using the GM07B, you'll need to find a switched power source somewhere else in the vehicle--there's not one in the factory radio connector.
Scosche also makes an adapter that's their version of the GMRC-04. Scosche's model number is DCGM14B. If you have this adapter, it should work similarly to the GMRC-04; but it's not a cheap adapter, so I'm guessing what you have is a GM07B.
By the way, NONE of these adapters will keep your steering wheel controls working. You need a completely different adapter, the SWI-PS, for this function.
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