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Inside courtesy lights


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My inside courtesy lights just stopped working and when I replace the fuse it instantly blew again. In addition the CD changer now keeps saying "error" and on my alarm when I turn it on it keeps showing like one of the doors are open (alarm is after market).

Do these all sound related? Where should I start looking for a problem?

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I would start by disconnecting the aftermarket alarm system and see if all the problems go away. If so, go to the alarm system vendor and have him repair it.

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