Question about 1999 Jeep Grand Cherokee

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1999 Grand Cherokee Electrical problems

Ok, i got a good one. none of my guages on the dash work, tach, speedo, all the "idiot" lights are on, the windows will not go up or down, the controls on the back of the steering wheel for the radio will not work, the overhead console (EVIS) will not give any info, just says N 30 degrees(if it come on at all). Ok, the kicker, if I shut the engine off, all the windows will roll up and down and most of the guages work. I have no trouble changing out parts as long as i know what i need to buy and nothing needs reprogrammed. What kind of modules, relays, ect. do i need to replace. Thanks for any help!

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  • Ramie J Apr 06, 2009

    I have a problem close to this one. My thing is that sometimes when I shut my engine off, or on a rare occasion while Im driving, I lose all power to everything,...radio, gauges, windows, door locks,...etc. When I turn the keyswitch on they all come back on but I have to reset my clock on the radio. I am not sure at all what to do. I am replacing the ignition switch tomorrow. I will post if it helps. Maybe it might be same solution for you also. Hopefully you will find out soon.

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OK, well from the sounds of it you may have a bad Body Control Module on your hands OR you may have a ignition switch problem.  The reason why I say it may be the ignition is because some stuff does work when the car is off, as you described.  Its complicated so read on... The Body Control Module (BCM) handles most of the items described by communicating with each of the different systems via the data bus network.  The module is like a central computer for all NON engine or drivetrain operations. It takes information from sensors and switches and decides everything from there. The location of this module is usually under the the left hand side dash panel, I cannot be certain of the exact location because my manual covers up to 98 and the 99's were a new body style, but it should be in the same general location.  It may be hidden under a bracket, but will have several wiring harnesses attached  Since power to the module is controlled by the ignition switch, there may be a problem there... why?  Well the BCM is designed to still give power to the windows for a short time after the car is off so long as the driver door is not opened.  Best Bet? get a used BCM out of a junk yard and try it, so you don't go wasting alot of money up front.  If that doesn't solve the problem you will need an electrical diagnosis done to see if the ignition switch or power from it is bad.  Good Luck!

Posted on Dec 26, 2008

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