Question about 1999 Jeep Grand Cherokee
Hey guys i got a 1999 jeep grand cherokee that has been a good vechicle unitl recently. The problem i am seeing is when i turn on the key everything works windows,cd changer over head display ( the directional and temp display on the top ) but when i start the jeep all the guages fall to the left and all the lights come on check enginem air bag,security key light ,low fuel basicaly every light in the cluster and the guage lights come on also. now the jeep stays running and can be driven but the windows dont work the cd player dont work the overhead display dont work and none of the guages move even the miles dont count i have pulled the pcm battery fuse a few times put it back in and some times it would spring back to life also pull the light switch to make the light flash like when your passing someone will sometimes make a guage jump or a buzzer come on.
none of this ever happen until my wife wa out of work for surgery and i drove her car to save gas and the jeep sat until the battery died about 2 weeks maybe 3 i unhooked the cables and charged the battery and it has been fine since then but now the guages are going nuts any ideas or possible fixes thanks for lookin
There is a one-wire communications bus system in these cars, called by Chrysler the "PCI" bus. The symptoms described strongly suggest a failure of bus communication. Depedning upon whichpost one reads, it appears either to be a partial or imtermittent failure or a total failure. For example, the information for the guage readings on the instrument panel comes from PCM (Powertrain Contol Module) transmissions sent over the PCI bus. No info, no guage readings. The problem is that, as far as is presently known, there does not exist any 3d party (aftermarket) equipment to communicate over the bus, and, according to a jeep tech interviewed today, one will not get any good hints from anything that appears at the OBDII connector (which can be read by any of various generic scan tools.) There is a proprietary Chrysler device called a DRB-III (that is now sold at some automotive outlets for a little over three thousand dollars for the unit) that will communicate with PCI devices about what they are hearing and saying over the PCI bus.
So... you can test, so of, an instrument panel, by holding in the odometer reset button while turning the key on. The guages will sweep, all the lights will come on, the segments will illuminate in sequence if the instrument panel is good.
Beyond which, you need to get the car to a DRB-III scanner, see which module (about eight choices -- door modules, a radio connection, etc.) is messing up communication on the PCI bus.
Posted on Dec 04, 2008
One of too problems pcm cluster just had one at the dealer and found that cluster was taking the bus down checked it at the bus port all modules have a voltage limiter and when they go out it will take the bus down.only when jeep is running due to alt voltage.
Posted on Feb 08, 2013
I recently purchased a 99 jeep grand cherokee and it stalls while driving??? Very dangerous no real warning until it happens gauges go completely dead then its dead. It will restart but it has to be in park will not start in neutral...not sure but I am wondering where i cna find the PCM ?
Posted on Sep 06, 2010
97 jeep grand cherokee gas gauge stays at empty after putting 30 dollars in the tank.
Posted on Nov 26, 2009
I had that problem with my 2000 Grand Cherokee. The gauges would flicker like crazy when I first started the car, of which by the way was starting slower each time I attempted.
Finally it wouldn't start and the were dancing all over the place. The rep. responding from AAA road services first attempt at starting the car did not work and he suggested that I had a more serious problem. I insisted that he try again giving the battery a little time to recharge; he did, and car started, I drove straght to sears for a battery replacement..............No more problems. It's been over a year since that happened. Good luck.
Posted on Apr 09, 2009
I cannot get the windows to operate. I also cannot find the appropriate fuse box to check the fuse. Any ideas?
Posted on Mar 29, 2009
I had the same problem as you my firend an because of my father in law left my headlights on 2 times on my 97 jeep the altenator was bad i had all the symptoms as u an for changing it fast
i was stuck in a highway for 5hr in 20degrees wheather with my wife take it from me replace it NOW
Posted on Mar 28, 2009
Had a car in my shop with exactly same problems. Found that it was the negative battery clamp making bad contact with the terminal. I replaced the clamp, cleaned the negative and positive battery posts, refitted the clamps and VOILLA all was fine. Road tested and still good. Hope this helps.
Tony from Croatia
Posted on Feb 13, 2009
We had almost the EXACT same problem with our 99 Grand Cherokee. The difference was that our Jeep wouldn't stay running after 5 seconds (security shutoff), the power windows, mirrors and locks wouldn't work and the overhead display was stuck in some "reset mode". I took it into a dealer who had a tech who actually knew where to look! It turned out to be a short that had occured in the wiring harness leading into the PCM. The short had been caused by a water leak in the front of the inner passenger compartment. It took him 3.6 hours at $85 an hour to pinpoint the exact spot of the short, but that was WELL worth it to me, especially when the other option is a dealer trying to replace everything an nothing improving in the long run! As soon as he hard wired around the shorted section of the harness - which is ALOT cheaper than replacing the entire harness, everything immediately came back on line! Good luch everyone!
Posted on Dec 08, 2008
YA, its the white casing in the passenger door that is doing all these crazy things, you probably need to replace your passenger control module because it is wigging out, temporary fix is to just unplug the white plug in until you get a new one.
Posted on Oct 02, 2008
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