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I'm having a similar issue, replacing the bad oem radio w/ wonky display (at the tail end of replacing the heater core...what a job!). New wiring harness fits in the brown and black connectors w/ nothing into the other multicolor connector. But even though I get voltage out into the new harness and connector, new radio doesn't turns on. I even tried another aftermarket radio and had the same results. I wonder if there is something in the multicolor connector which controls the antitheft system and needs to be jumped. I've searched on line but no mention of this. I've seen youtubes of people putting in aftermarket radios w/out any special interventions. My next step is to put the old radio back in and see if it works (do have the code...)
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