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Unread 09-08-2012, 07:06 PM   #1
brokarl
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1998 Jeep Grand Cherokee Electrical Issues

My jeep started having issues last week. The power seats went out, I checked the fuses and one of the relays under the dash was hot. I replaced it and now the radio, turn signals, flashers, power seats, and courtesy lights don't work. Checked all the fuses under the dash and in the power control center and all are ok. Got a used BCM module and installed-still no power to the other components. BCM is reading because the mileage of the prev Jeep is now showing. Had an issue about 3 yrs ago with the heater control switch not working and just ran a straight line to the fan motor and a manual switch. Seems like all the wiring leads back to the Power Control Center.

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Unread 09-09-2012, 03:08 PM   #2
coralman
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Sounds like you might have lost a ground. You'll be better off with a volt ,ohm meter and a factory service manual that has the wiring diagrams so you can start trouble shooting.Korea zj is the wiring wiz here. Did all the stuff go at once or did the seats go then the other stuff?
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Unread 09-09-2012, 08:08 PM   #3
brokarl
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The seats went out that am, later in the afternoon I went to change the relay and then everything else went out
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Unread 09-09-2012, 08:46 PM   #4
JS97ZJ
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Check fuse #15 in the PDC. If it checks out, You'll need a meter or a test light to test for power going to these other fuses in the JB. Fuse #15 provide power to all the affected fused circuits your having problems with.
1.png  
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Unread 09-10-2012, 05:57 AM   #5
KoreaZJ
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Quote:
Originally Posted by brokarl View Post
...The power seats went out, I checked the fuses and one of the relays under the dash was hot...
Which relay?
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Unread 09-10-2012, 06:57 PM   #6
brokarl
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CB 3, the third one up from the regular fuses on the interior fuse box.
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Unread 09-10-2012, 08:39 PM   #7
JS97ZJ
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In general, CB3, is a circuit breaker that would power either the the power seat module (limited edition) or the regular (Laredo) power seats.
Which do you have?
Either way that circuit breaker shouldn't be hot. Something is is constantly drawing on that circuit. Are any of the switches broken?
p1.png  
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Unread 09-10-2012, 09:54 PM   #8
brokarl
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Regular Laredo, both seats have been working. I swear that when I replaced that circuit breaker I heard a static sound under the passenger side seat-and then the other components did not work.
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Unread 09-10-2012, 09:57 PM   #9
brokarl
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Correction-I have not used the heated elements due to summer and don't usually adjust the lumbar-only the front to back.
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Unread 09-11-2012, 07:43 AM   #10
KoreaZJ
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Passenger side static sound might be shorted wires or switch. Disconnect the passenger seat switch connector and see if the problem goes away, and everything else works. Then just need to isolate the short or bad component.

CB-3 circuit breaker resets itself once it cools.
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Unread 09-11-2012, 07:59 AM   #11
JS97ZJ
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The circuit breaker is self resetting (probably thermally controlled. That why you felt heat. You could have pushed the limits of the circuit by replacing the cb3 and caused a burn out in the main feed section to the JB that gives power to those other fuses.
Disconnect CB 3, find the open to the JB (connector #2 pin #2) or at the PDC and repair it. Then work on the problem in the pass. seat. don't hook up the breaker until you've fixed the situation.

You could also be looking for a shorted wire leading to the seat.
p2.png   p3.png   p4.png   p5.png  
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Unread 09-11-2012, 07:32 PM   #12
brokarl
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Thanks for the assist, I will work on finding the short in the seats and check on the power connect to the PDC, Prob have to wait until Thursday, still drives fine-inspection due by Dec so have time to work on it. Don't go anywhere, may need more support.
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Unread 09-13-2012, 12:19 PM   #13
brokarl
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Pulled the passenger side switch off and it had an electrical burn on the bottom side. Put the fuse back in on the PDC and all is fine. Never would have found this simple fix without you guys-thanks
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Unread 07-23-2013, 11:03 AM   #14
Laredo98
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1998 jeep grand cherokee ignition wiring diagram

Hi Everybody I am new here wondering if you can help me out I have a this vehicle and I have crank but no start I also have no spark on my spark plugs does anyone have this ignition wiring diagram so I can pinpoint were my problem is?
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