Question about 2004 Jeep Grand Cherokee

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My windows and door lock stoped working, the interior light would come on intermitaly when i turned the head lights. after fixing the broken ground in the door jam the check enging, break, and ABS light came on. speedomater stop workin and turn singel on the dash acts like the light is burned out. and wipers are not working.

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Grand Cherokee Jeeps suffer from problems related to PCI (programmable control interface) bus connectected to the PCM (main car computer). If that is the issue, then it cannot be fixed or diagnosed with ordinary tools, but scan is done using a DRBIII (not standard OBDII) reader available at the dealer's place.

Try first disconnecting the battery cable for ten minutes. Ensure you have anti theft code if needed.

Find the nearest dealer and, apart doing a standard OBDII scan, ask a scan for PCI bus problem, that is a common fault. Mention them that the problem may be related to this, the mechanic may not be aware of the common issue .

If that is not the problem, then the problem is a bad contact or a short. This is affecting different sections of your Jeep wiring.

Troubleshooting this kind of problem requires patience. Repair is done following wiring with multimeter reading Volts on wiring.
First check battery ground cable and battery connectors.Start from the underhood fuse box. Check contacts at the back. If the problem started from one single door and central lock, check the wiring behind the door panel.
Each power window has also its own control module that will also affect central locking. If problem started on a single door , then PDM and DDM (the two modules) must be checked.

Here full wiring diagrams for your jeep: exj_8w.pdf

Posted on May 31, 2010

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  • m_sciole May 31, 2010

    why is it when i found the broken ground wire in the door jam and fixed that, the other light went on the dash and the speeddometer went. now in the begining the ground wire broke and the windows all went as well all the door pannels. the button that worked was the door lock button on the front passager door. the keyless entra would not lock or unlock the driverside door only. then the battery diead. the car sat for about 3 months. replaced the battery and about 3 months later i fixed the ground and all this other stuff happened. since then i cut the wire i jumper for the broken ground to see if there was a problem there and everything still doesnt work. should i be checking fuses or anything else.

  • m_sciole May 31, 2010

    all the gauges work expect the speedomater. and the wippers are having problems. as well as the turn singels

  • m_sciole May 31, 2010

    i tried to discont the battery for 10 mins. the abs, break, and engine light are still on. the wippers still dont work. i cut the jumper cable for the driver side control pannel. and nothing changed. all the turn singles work but the front drivers side is burned out. I checked fuses and nothing seems blown. but i only check the ones i can see the middle on. now i did notice that the battery termails are lose and will not get any tighter. i was able to pull them off and on without loseing anything. is there fuse i should look for or wire, connections.



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