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1998 Jeep Grand Cherokee TSI Evil Electrical Demon
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eviljeeptsi
New User
Aug 12, 2008, 6:14 PM
Post #1 of 2
(2161 views)
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1998 Jeep Grand Cherokee TSI Evil Electrical Demon
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The run down:
1997 Jeep Grand Cherokee TSI V-8 4X4
The jeep runs great at all speeds, as well as the transmission. It is pretty much sound mechanically. But electrical y it is evil.
The dash gauges do not work. The interior Lights will not go off. The power windows will not work on any door. I had to remove the interior light fuse just to get them to turn off. When you put the fuse back in, the relay clicks repeatedly, then seems to quickly drain the battery. It SEEMS that as long as the fuse is out the battery stays charged.
The radio and fan both work. The power seats work as well. The information center on the upper console and the larger display information center that has a digital picture of the jeep located near the shifter both light up, but display no information (outside temp, compass, etc.), just hyphens. The bottom info center that has a picture of the jeep will not show that a door is ajar when it is.
I have checked all fuses and circuit breakers, but all are good.
I have taken it to two shops that gave up and told me to come pick it up (I figure because they did not want to mess with it). The third shop I took it to told me that the BCM would not communicate. And that I would have to buy a new BCM at the dealership and have the dealership program it to my jeep. I took it to the dealership and had the new BCM installed. They told me that it made no difference and that it was still not communicating. Why would a new BCM not even communicate? The problem must be before the BCM.
The dealership said that they will not do anymore diagnostics on it because it has been gone through by too many other shops. All wires that have been messed with are still in-tact though. I am to the point to where I am willing to dismantle the dash and dig in. But if I could get some ideas on how to go about this, I would be very grateful.
Please note that the lights behind the gauges do work just not the needles themselves.
So after over $1000 of spending I still have the same Jeep I did at the start of all this. I cannot take it to anymore shops as I will probably end up spending all together, more than the Jeep is worth.
Could this be an ECM/PCM issue?
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Jeff Norfolk
Enthusiast
Aug 12, 2008, 7:43 PM
Post #2 of 2
(2155 views)
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Re: 1998 Jeep Grand Cherokee TSI Evil Electrical Demon
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The BCM is a good place to focus your attention. All of the problems you described are controlled either in part are totally by the BCM. If the BCM is not communicating there is a reason why (and it may not be the BCM itself). Locate the BCM(behind the lower left side of dash) and check for powers and grounds that should be present. Even though all of the fuses are good there may be a break in one of the wires to the BCM causing the no communication problem. Here is a list
Plug C1
Pin #16 Blk/Org (Ground)
Pin #18 Org (Power in run or start)(Fuse #18)
Plug C2
Pin #8 Violet (Power all the time)(Fuse #7)
Pin #15 Brn/Pnk (Power in run and acc)
Pin #24 Blk (Ground)
Plug C3
Pin #8 Blk/Org (Ground)
It sounds like the BCM may be inopperative due to lack of power or ground. Which would also cause no communication and the symptoms you are having.
Jeff
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