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<blockquote data-quote="wsu99999" data-source="post: 6921494" data-attributes="member: 624443">Hey man - what will happen is the Deville will go into sleep mode every 6-12 hours. It does this because the factory deck has anti-theft stuff in it.&nbsp; The wiring harness WILL NOT WORK!&nbsp; You will need to relocate the existing tape deck to your trunk, run a new power, and these two purple cords called datamax or something like that to the trunk.&nbsp; That will fix your problem.It&#039;s a BIG PAIN IN THE BUTT!&nbsp; But it&#039;s doable, and no different than hooking up any other system other than you have to mount the old deck somewhere else.For newer Cadillacs, or even older ones, they have a little mod box that will correct this problem and make it to where you don&#039;t need to relocate the deck.&nbsp; Those boxes are around 100 bucks.&nbsp; The mod box WILL NOT WORK for a 98 Deville.&nbsp; Trust me, I&#039;ve tried, for some reason, it won&#039;t work.</blockquote>

[QUOTE="wsu99999, post: 6921494, member: 624443"] Hey man - what will happen is the Deville will go into sleep mode every 6-12 hours. It does this because the factory deck has anti-theft stuff in it. The wiring harness WILL NOT WORK! You will need to relocate the existing tape deck to your trunk, run a new power, and these two purple cords called datamax or something like that to the trunk. That will fix your problem. It's a BIG PAIN IN THE BUTT! But it's doable, and no different than hooking up any other system other than you have to mount the old deck somewhere else. For newer Cadillacs, or even older ones, they have a little mod box that will correct this problem and make it to where you don't need to relocate the deck. Those boxes are around 100 bucks. The mod box WILL NOT WORK for a 98 Deville. Trust me, I've tried, for some reason, it won't work. [/QUOTE]

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