well i was also told by a service tech that in the 2002 up models, if you do not have the stock stero or the harness thing that gets rid of the stock head unit you can't do a diagnostics properly. there is somethiing integrated into the stock unit that is intergrated into the diagnostics thing. so getting rid of the stock uint altogether is not a good idea unless you install one of those adapters.
I was also told this by several car audio placesa and custom auto shops
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