Question about 2002 Jeep Grand Cherokee

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More info Yes, all the problems happened at once...for the most part.  The interior lights started acting funny first by not cutting off when I closed the door.  That was in the evening.  The next morning, windows not rolling down, temp reading not showing up, or any other info on the display, blue bright light indicator does not work, and the air does not work.  I know of no other issues that have occurred.  Can you tell me do I need to take the door apart to look at some of the wiring?  It sounds like this is the problem according to this web site and they say the wires in the door.  You have already helped a great deal and I appreciate it.  Thanks.

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OK... First, check all fuses in the power distribution center under the hood. Generally found on right fender, close to the battery. This box contains fuses and relays. On the inside cover, the systems served are labeled. Use a volt meter for this. Write down what you found. Voltage is generally not more than one volt less than the voltage you read across the top of the battery (there are exceptions for sensors and computer related stuff which read much lower but are likely not involved with your problem. Do the same thing under the dash, at the "regular"fuse box.
I have a built in mistrust for the body grounds on most vehicles, so what I normally do is run a ground "bonding" wire around the inside of the engine compartment, connecting first to the battery, then to both front fenders, engine block, through the firewall to the metal frame of the dashboard.(not part of testing, but sometimes helps before getting into all the crazy stuff, and definitely never hurts!
While checking fuses, don't forget the circut breakers... small metal boxes slightly larger than a fuse, also plugged into the fuse box. These are checked by removing them and checking for continuity with an ohmeter., or if several are labeled as the same value, by interchanging them and seeing if problem changes. If you find a fuse that has no power on one side, change it. If it blows, there is a short somewhere in that system. If there is no power on either side with key on or off, there is a bad connection ahead of the fuse, which you need to backtrack. If you get to the point where you need to open up the door, first check power on both sides of the rubber boot that houses the wires going into the door from the body,. as this where the most flexing and wire breakage happens.I probably mentioned this before, but if you get this far into it, it's good to get an accurate wiring diagram.(not from a haynes manual...they are terrible) What you will be looking for is any place that the systems that are not functioning share a power source... either a hard wire connection, a body control module or other component.
If you find a broken wire, if there is sufficient slack, twist both ends together and solder. If not, "bridge" with a piece of wire not less than the original thickness (diameter) and solder it in. Either use tape or shrink tubing to protect the connections.
I can't get into this further without actually being there and doing it for you...Just remember that wiring is not "magical" and that it is just like a bunch of garden hoses connected together... What goes in one end, must come out on the other end.Good Luck!!!

Posted on Dec 22, 2008

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