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CHANGED THE COMPUTER IN A 97 GRAND CARAVAN AND NOW IT WONT START
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tasha
User
Feb 5, 2010, 7:51 PM
Post #1 of 13
(2687 views)
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CHANGED THE COMPUTER IN A 97 GRAND CARAVAN AND NOW IT WONT START
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A FRIEND OF MIND PULLED OUT THE COMPUTER FROM MY VAN AND IT FELL ON THE GROUND SO I BOUGHT ANOTHER ONE AND IT NOT STARTING I PUT THE KEY IN AND IT NOT MAKING ANY KIND OF NOISE AT ALL HELP .
(This post was edited by tasha on Feb 5, 2010, 8:06 PM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 5, 2010, 8:25 PM
Post #2 of 13
(2674 views)
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Re: CHANGED THE COMPUTER IN A 97 GRAND CARAVAN AND NOW IT WONT START
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Hi Tasha,
Is this to say it's now behaving as if there's no battery at all? It's very standard when working on electrical stuff to disconnect at least negative post of battery while working on a vehicle. This also can and does reset stuff all thru the thing.
If connections (battery cables at both ends) are good and this won't even crank then check a few things.
Try putting headlights on such that you can see them against something. Do they work? If so, now try starter and if lights go out that would suggest a connection problem perhaps coincidental to anything just done.
If the vehicle has an anti-theft device it may be the issue! You'll need to know how to get that back in order if so especially if an aftermarket device I don't know of one way to suggest what to do with assorted ones. Need to know if that's even in the cards with this.
Also, what was the reason for replacing the computer in the first place?
T
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tasha
User
Feb 5, 2010, 8:38 PM
Post #3 of 13
(2667 views)
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Re: CHANGED THE COMPUTER IN A 97 GRAND CARAVAN AND NOW IT WONT START
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I HAD TO CHANGE THE COMPUTER BECAUSE THE GUY DROPPED THE OLD ON ON THE GROUND AND BROKE 3 PINS WHERE THE PLUGS GO . HE SAID HE WAS RESETTING THE COMPUTER IN MY CAR FOR WHAT IS I DON'T GET AND YES WHEN I PUT THE NEW ONE IN I UNPLUGGED THE BATTERY .AND YES IT DOES HAVE A NONE FACTORY ALARM ON IT .
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 5, 2010, 9:44 PM
Post #4 of 13
(2659 views)
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Re: CHANGED THE COMPUTER IN A 97 GRAND CARAVAN AND NOW IT WONT START
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OK: I'm not the site's Mopar whiz which doesn't matter much as it's an aftermarket alarm and who knows what it does when power is lost? Some would prevent the vehicle from running, starting or just make noise and flash lights. If there was one easy way to defeat that there would be no point in the things at all so you need to find out what procedure or how to enable the vehicle.
I also don't know why it had to be removed or why it needed or thought to need resetting??
Generally when disconnecting a battery an assortment of info is lost and "Memory Savers" are to be used to prevent something like this.
Give it some time now for others to suggest but what I see now is you need the specific method to enable this vehicle again as it probably is reacting normally for that specific anti theft system. For now, I'd find out the make of the system and contact them or if you know who or where, the installer of it is,
T
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DanD
Veteran
/ Moderator
Feb 6, 2010, 4:51 AM
Post #5 of 13
(2654 views)
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Re: CHANGED THE COMPUTER IN A 97 GRAND CARAVAN AND NOW IT WONT START
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Like what Tom has said there are so many variables; “A”is the problem caused by the factory anti theft, the after market system, the compatibility of the replacement computer with the after market alarm system?
“B” None of the above and there’s an issue with the starting system, itself?
The way things are suppose to work with the factory anti theft (if your vehicle has one; not all models do).
You park the van, remove the ignition key, get out, close & lock all the doors; this arms the anti theft; after 16 seconds.
You come back to the van; unlock the door(s) with the key or key fob (remote transmitter). This signals the Body Control Module (BCM) (computer) that the door has been opened “normaly” and not set off the lights or horn.
You now insert the key in the ignition; the BCM recognizes the chip that is imbedded in the key. The BCM now signals the Powertrain Control Module (PCM) (engine management computer) that all is ok. The PCM now applies ground to the starter relay’s pull-in coil; making it ready and waiting for you to turn the ignition to the start position. When you do turn the ignition; to the start position; that applies power to the starter relay. That closes (turns on) the relay; which applies power to the starter solenoid which in turn, engages the starter motor.
Crap that’s a mouth full and I think I still left some things out? LOL
Now you’ve got an after market alarm to add to the mix; where do we go, as in offering advice?
The only thing I can think of is; close all the doors, lock the doors wait for the 16 seconds for the factory alarm (if there’s one) to set. Then unlock and try starting?
If that doesn’t work and if you were a customer of mine I say tow it in.
Where we would go through and check the different systems that might be triggering this to happen.
Way to many variables?
Dan.
Canadian "EH"
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tasha
User
Feb 6, 2010, 11:32 AM
Post #6 of 13
(2641 views)
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Re: CHANGED THE COMPUTER IN A 97 GRAND CARAVAN AND NOW IT WONT START
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there is no factory alarm and the key to this van looks regular like it is a copy i bought it from a friend and she said she never had a factory key
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tusseltussel
User
Feb 6, 2010, 1:39 PM
Post #7 of 13
(2634 views)
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Re: CHANGED THE COMPUTER IN A 97 GRAND CARAVAN AND NOW IT WONT START
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most times an aftermarket alarm can be disabled very simply, thier should be a small toggle switch or small red button( attached somewhere up under the dash like if you were sitting in there it would be up in front/above your left shin. if i remember you just had to hold that button in as you turned on the key and it would disable the alarm, may have been hold it in count to 5 and turn key on but either way wouldnt hurt to just give it a look and see if their is a button to disable the alarm... other than that i remember slightly that the gm cars had a prom (Programmable Read Only Memory) you needed to take them out from the old ECM and instal in the new one, not sure if dodge did the same thing but it may be something to research
poke here ----> http://www.autocomputerexchange.com/Product/302 not sure i can get the link to work but might find some info there looks like they have sales agents you can chat with online and you can ask what the programing and all is about in the part discription that might be what i do and if thats not it than no harm done and no money spent
(This post was edited by tusseltussel on Feb 6, 2010, 1:53 PM)
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tasha
User
Feb 6, 2010, 10:12 PM
Post #8 of 13
(2620 views)
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Re: CHANGED THE COMPUTER IN A 97 GRAND CARAVAN AND NOW IT WONT START
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wow the sit you just ref. that is the company i bought the new computer from that's so weird . im going to call them back up and have a talk about the computer.thanks
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tasha
User
Feb 6, 2010, 10:34 PM
Post #9 of 13
(2617 views)
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Re: CHANGED THE COMPUTER IN A 97 GRAND CARAVAN AND NOW IT WONT START
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thanks Dand i tried that too didn't work im stuck like chuck i feel kinda dum right now guys i'm not a mechanic you guys should see me running back and fourth from the computer to the van and being a mom playing with a baby omg i feel like i'm going nuts lol if this thing not fix by Monday off it goes to the shop i tried can i get a C+ for trying lol
(This post was edited by tasha on Feb 6, 2010, 10:38 PM)
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tasha
User
Feb 7, 2010, 2:36 PM
Post #10 of 13
(2595 views)
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Re: CHANGED THE COMPUTER IN A 97 GRAND CARAVAN AND NOW IT WONT START
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hey guys !!! would you believe i
fix my van and after trying everything everyone said i sat in the van
put my head down on the wheel and started crying and then i said to my
self im going to take the whole dash apart and as i started pulling
thing out i ran across another fuse box that also had relays in it i
guess that was for the alarm but any how i started pulling out relays
and wow there was one relay very loose so i pushed it in and bamm the
van now starts with no problem and i am soo happy i just want to say
thank you to everyone who tried to help me it really means alot to me
that no one said omg she's a women tring to fix her own car but thanks
guys!!!!
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tusseltussel
User
Feb 7, 2010, 2:53 PM
Post #11 of 13
(2591 views)
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Re: CHANGED THE COMPUTER IN A 97 GRAND CARAVAN AND NOW IT WONT START
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congratulations... take a nice drive by yourself and soak it up.................. be sure to bring a cell phone
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tasha
User
Feb 7, 2010, 3:54 PM
Post #12 of 13
(2583 views)
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Re: CHANGED THE COMPUTER IN A 97 GRAND CARAVAN AND NOW IT WONT START
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ha ha funnnny!!
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