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Originally Posted by Strate
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Well, do not listen to those other guys on the other site. They do not know exactly what to do. Simply activating the domelight won't cause the accessory wire to shut off. Try it. Get in the car, turn ign. on then off. Make sure your radio is on then turn on the domelight. If it shuts everything else off then they are right. Some of the old Blazers and other GM cars are like this. If not, then you need to trigger the door pin switch.
You should find a white wire that test (-) at the TRW keyless entry module mounted to the under dash panel on drivers side. With the module unplugged, the drivers door lock will no longer function. If your Blazer didn't have OEM keyless, there will still be a module there. Anyway, find the wire on the RS that sends out a (-) trigger when the system shuts back down. It is usually labled as (alarm rearm output). It is commonly used to rearm OEM alarms if you shut the RS off. This will trigger the door trigger which will shut the radio off. Pretty simple really.