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Q: ignition switch is stuck in the on position, what would cause this & due I have on 2000 Cadillac Eldorado

to install a new switch? and if so due I have to have new keys programed to the car?
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Customer Concern: Ignition key won't come out. REV/LK fuse #31 blows immediately. When the LK/CYL relay is removed, the fuse stops blowing.

Tests/Procedures: 1. Unplug the ignition lock cylinder control actuator. If the fuse stops blowing, replace the actuator.

2. If the fuse still blows with the actuator unplugged, inspect circuit #2356 (Dk Green/White) for a short to ground between the actuator and the rear fuse block.
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Two great answers, does sound like an ignition switch problem, but just goes to show always look to see if there are bulletins from the manufacturer.There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
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