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  #37  
Old 01-06-2013, 05:39 PM
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Re: Immobiliser Problem?

Hi Frango, assuming that you have the same manual I have the information is in section 8W-18. The wiring diagrams are 8W-18-2, 3 & 4. 8W-18-4 shows the connector at the bottom of the page.

As soon as I saw the connector and the way it's laid out I too assumed it was primarily to allow a dealer to interrogate and identify separate subsystems on the bus.
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  #38  
Old 01-06-2013, 09:31 PM
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Re: Immobiliser Problem?

My 2004 service manual only shows the data link connector on those pages, will see tomorrow if the manual for previous years has different schematics.
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  #39  
Old 01-08-2013, 01:44 AM
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Re: Immobiliser Problem?

Ah, well, this information came from the 2001 manual.
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Old 01-08-2013, 02:15 AM
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Re: Immobiliser Problem?

well for what its worth i am in awe of youre perserverance and determination. i wish you the best of luck,keep hammering away at it, and dont give up. happy new year
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  #41  
Old 01-08-2013, 12:40 PM
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Re: Immobiliser Problem?

Yes, i saw the different schematics, on the 2004 WJ they don´t show the diagnostic junction port. Wonder if its not there though...................
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  #42  
Old 01-08-2013, 01:45 PM
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Re: Immobiliser Problem?

Quote:
Originally Posted by kennzz05 View Post
well for what its worth i am in awe of youre perserverance and determination. i wish you the best of luck,keep hammering away at it, and dont give up. happy new year
Ha ha, thanks for that. This has become a quest now and I will not let it beat me even if I have to strip out every single wire and electrical system in the car until I figure it out. I'll virtually guarantee that when I do find the cause it will be something silly that costs nothing to fix!!
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Old 01-12-2013, 03:00 PM
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Re: Immobiliser Problem?

Just found out that the diagnostic junction port was discontinued after 2003.
Have a look at the next site as well. Eventhough the signals on the bus go from 0V to 7.5V (which you should be able to see with an osciloscope), it seems that when you measure with a DVM, it should show 2.0-2.5V. Anything higher than that means a problem with one of the modules.
Grand Cherokee 2000 Electrical Problems - CNET Car Tech Forums
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Old 04-18-2013, 12:27 PM
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Re: Immobiliser Problem?

Wow, astounding amount of work you've put into this. When you changed out all the modules, did you reprogram the modules? I understand you bought what was believed to be a matched set of modules and simultaneously replaced them all. But do you still get the same no-start condition portrayed in the video? In that video, the Sentry Key Immobilizer System (SKIS) light is on steady. That indicates a fault with the Sentry Key Immobilizer Module (SKIM). If the system did not read an appropriately programmed key, the light on the instrument cluster would flash. If the SKIM module is faulty or not programmed properly, it will alter all communication with the instrument cluster and the vehicle will not start. Even though you did buy all those modules together and they were supposedly from the same vehicle, you never know, maybe one component was not the original module. When a SKIM is replaced, it must be programmed with an appropriate scan tool and you must have access to the unique 4 digit PIN number for the original vehicle. If there is any discrepancy in communication between the PCM, BCM and SKIM, the vehicle would act as you originally described. The secret key PIN has to be transferred appropriately to the PCM with a specific scan tool. It may be something as simple as one module having one VIN number and another module having another. All fault codes related to the SKIM can only be read with a particular scan tool because of the anti-theft engineering in which you have to have the PIN number and the right scan tool to access the SKIM. SKIM fault codes will not appear on the odometer with the 3-off-4-on key technique. Any possibility you could get this to an authorized Jeep dealer who has the DRB-III scan tool to do this programming?
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  #45  
Old 05-10-2013, 02:40 PM
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Re: Immobiliser Problem?

It's been a while since I last had a look at this so as I had a couple of hours to spare this afternoon I thought I'd take another look.

Guess what................ I got it running!!!!!

I cannot understand how this happened but I noticed that fuse 19 was missing from the PDC. This is labelled up as PCM battery. I placed a fuse in there, turned on the ignition and all the gauges burst into life. Tried cranking it and it fired up and ran for a couple of seconds. Tried it again and it did the same. Looks like the SKIM was not recognising the key correctly and shutting the engine down. I wondered whether I had somehow mixed up the two SKIM modules that I had so I swapped them over. No luck at all now. The SKIS light was on permanently. Swapped back to the old SKIM and the SKIS light still remained on and the engine would now not start at all.

Strange!! So I dug out the second complete ignition lock assembly and fitted that along with the SKIM module it came with. Using the key that came with this assembly I was expecting it to recognise the key but for there to be some problems with using a SKIM from a totally different car to that which the PCM and BCM came from. I was pleasantly surprised when I turned the key, the SKIS light did its three second check and then went out. Turned the key further and the engine started and kept running. So it looks like you can use any SKIM module providing it has the matching key and that they are not 'keyed' to any other of the cars electronics. It means that I will now have two different keys for the car (one for the ignition and one for the locks) but I don't care because it now starts and runs!! It's miss firing like hell at the moment, probably due to standing for nearly a year. A set of plugs will probably sort that out. The code reader is telling my two of the coils are at fault but I doubt that is really the problem.

So, this fuse 19, PCM battery. I'm guessing that there is a rechargeable battery in the PCM and I must have removed the fuse when I was trying to solve the battery drain problem and forgot to put it back. The car kept running all the time that there was charge in the PCM battery but eventually it ran down and shut down some of the PCM systems. I know that there was other power to the PCM as I had checked for the reference voltage at the distributor and there was some data on the bus so the PCM must have been partially alive.

Well, the end of a nearly year long saga. I was determined that this car would not beat me!! Now to recommission it and decide whether to keep and and sell the Mercedes or just get rid of the Jeep. At the moment I want to get some use out of the Jeep - it owes me that!!
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  #46  
Old 05-11-2013, 09:36 AM
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Re: Immobiliser Problem?

Congrats on the results.
Was just looking into the wiring and found the fuse 19 in the PDC is a constant battery feed to the PCM. Maybe feeding memory functions of the PCM? Still strange that with a different SKIM no programming was.necessary, but lucky for you.
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  #47  
Old 05-11-2013, 02:09 PM
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Re: Immobiliser Problem?

What I can't understand is that the car ran perfectly for several weeks without fuse 19 being fitted. Hence my thought that it is something to do with a rechargeable backup battery that eventually went flat.

Missfire now sorted too. The crank position sensor was a little too far away from the flywheel. Pushed it in a bit further and its now running sweetly.

I have read elsewhere that an intermittent CPS signal can also cause SKIM issues so I may try refitting the original SKIM module tomorrow and see if it will work. Can't see why the CPS could effect it but who knows!!
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