Quote:
Originally Posted by kingalbrect79
Lastly and most expensively, you will need a wiring harness. Unfortunately this truck is like every other GM vehicle equipped with Passlock security systems in the last 10 years. There is no ignition wire that you would traditionally find in most vehicles. Also you can't just go randomly searching for an ignition signal because you will overload the circuits in the truck and draw too much amperage blowing the circuit. Your safest alternative is to buy a wiring harness. This will allow you to plug the stereo right into the truck as if it was intended to be there. The downside, it costs about 80-100 bucks depending on where you get it.
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The harness in unnecessary. The IGN ON wire is
very low current, so it is perfectly safe to tap into the wiper fuse (on in run and acc). Just install a 1 amp inline fuse so that if it would ever short to ground it doesn't take out the wiper fuse too.
It also has nothing to do with it being passlock or not. GM started using "RDS" radios instead of the theftlock ones, matches the VIN number in the radio to the one in the BCM or PCM. Much harder to get around than having to press some buttons and call an 800- number
. The RDS radio uses a UART data line to turn the unit on/off.