A) yes, sorta. The dealer tool is a DRB, specifically a DRB3, and many dealers don't like to admit they still have one even if they do.
B) nope, it's a bit more involved that just the scanner
C) also no! the zj pcm/bcm do not care about the VIN that is programmed into one matching the VIN programmed into the other.

It sounds like you started with a non-security jeep and have now enabled security in the PCM?

 

I'm not sure what the PCM is, but i'm almost certain my jeep is security because it came with a fob and has a red light indicating security. There is a guy upstate who says he has a scanner but he says the BCM may not be the only issue and something else may be at fault which caused the original BCM to fry.

 

How was the old BCM determined to be fried? You'll also need to redo the odometer mileage with a capable scan tool as whatever is stored in the BCM is what will show up on the dash.

 

I took it to a mechanic to determine where a parasitic draw was coming from, I knew it had something to do with the BCM because pulling out fuse #7 seemed to stop the power draw. He told me the BCM was fried and I'd need to get a knew one, never even mentioning that I'd have to find someone to reprogram the new one as well.

 

agree no vin in zj bcm

your issue is vtss (the bcm had vtss and now your pcm has its previously sleeping vtss programing activated)

you can add an intermittent switch to ground the vtss disarm wire to the bcm and if you ground it after entry your engine will start and run

don't do a continuous ground or it will keep interior lights on and drain battery

 

add intermittent ground switch to the vtss disarm sense wire as shown here

 

pin 10 on the smaller square connector on the BCM not either larger rectangle 24 pin

 

if your connector lacks this wire you will need to add it

replacing or reprogramming just BCM won't work as the VTSS function in PCM was activated by multiple starts with BCM that had VTSS attached over ccd bus
so to go back to no vtss you would have to also reprogram pcm

 

Sorry I'm no electrician so I wouldn't know how to ground wires to disarm the vtss. Do you just recommend taking out the PCM and bringing both the BCM and PCM to someone with a DRB 3 scanner? Thank you though this was very good info

 

Chrysler PCM horror stories and simple solution

Over the years I have read enough horror stories about Chrysler PCM (old style no CAN vehicles). Like swapping it from another car for testing purposes and now the donor has not start condition. It happened because of VTSS system. This system is optional and c

www.iatn.net

 

Have you tried the FOB? It should still work fine as it's tied to the Passenger Door Module. It may also need to be started 20 times for the things to get back in sync. Fuse 7 goes to a few more things than the BCM also, the PCM is one, Powertrain Control Module under the hood, aka engine and transmission computer.

 

Ya, parasitic draw on fuse 7 is almost never the fault of the BCM itself. Usually it's some other component in the jeep that is keeping the BCM from sleeping.

 

Yeah it's weird because I knew that when I brought it to a mechanic and he said it was the BCM alone because it was fried.

 

I actually think your idea is do able and I'll attempt it. I've heard of other people grounding a "Yellow Purple" in the door panel and that solving the issue as well though Im not sure if that would cause other issues.

 

Yes, grounding the "yellow purple" on a BCM jeep will cause issues, like high parasitic draw from the BCM never sleeping and the interior lights staying on.

Make sure you've done the thing RDC mentioned, it may take a silly number of tries to get the BCM and PCM to sync.

 

I'm not sure what you mean by getting the BCM and PCM to sync. Do you mean I have to use my key fob a bunch of times? because My key fob has never worked which may be an issue.

 

No, like RDC said, it may take starting the jeep a number of times to get the PCM and BCM to work together.

 

it may take up to 20 starts for a BCM programed with VTSS to awaken/activate that feature in the pcm but you already did as that is what shuts off engine after a second or 2 (VTSS being active in PCM and armed)
no number of starts with any BCM (with or without VTSS programing) will reverse the PCM VTSS activation

 

If it's armed, and the LED is blinking, then try cycling the key in both front door locks, don't open anything just turn the key both ways, as well as try the rear hatch lock a few times. If any one of those 3 switches are still working that should disable the VTSS for a bit.

 

if he did not have vtss on original vehicle/bcm there may not be any switches on the key cylinders
as I understand his history he connected a vtss active bcm onto his non vtss vehicle and now engine starts and immediately stops

 

Post #4 makes it plausible, plus it takes no rewiring to try.

 

if he just runs a vin based build sheet on this link and looks for security option on the sheet we will know
(I know it says 98 and newer but works fine for my 93 zj and 92 yj so ignore that it says build sheets only for 98 and newer)

FCA RAM

fcagroup.my.site.com

 

Thanks. The website says "SECURITY ALARM" so I think my vehicle has VTSS, so the BCM should have VTSS too right?

 

could be other way around
started with vtss vehicle and with pcm having received an arm signal swapped to no vtss bcm which could not send disarm signal to the pcm
if so all he needs to do is put back original bcm disarm then ground out ccd bus while he removes old and reconnects new non vtss bcm then und ground out ccd bus and system will stay unarmed as in horror story link I previously posted

build sheet should tell the tale

 

I'm not sure if that's an option because the original BCM was discarded by the people who gave me a new BCM. Do you think I could just bypass the immobilizer by grounding the purple/yellow wire and install a toggle switch on the wire so I can ground and reground the wire with a flip of a switch because it would drain the battery otherwise.

 

so the old BCM had VTSS but the new one might not so just follow the guidance I linked in post 10 as it shows how to make a vtss activated pcm (like yours) work in a vehicle without VTSS module/BCM like yours is now

 

Muy Buenos dias, gracias por la ayuda a mi pregunta, y bueno tengo otra duda al resoecto de mi modulo BCM, de mi mi vehiculo grand cherokee limited 1997, 5.2,,, cuales son los numeros especificos que deven coincidir con mi modulo bcm original, en caso que yo consiga uno, en que me debo de dar cuenta, por que puedo observar que los modulo train algunos numeros seriales, gracias por la ayuda.

 

Overall it makes really no difference which one you pick, as long as it's for a 96-98. The VTSS option is the main thing that needs to match whatever your Jeep originally had, but you can't tell if that option is enabled from the serial number or not, and even if you could, it could have had that option turned on or off at some point in the last 30 years. The mileage displayed will also change based on whatever the 'new' BCM mileage is.

What is wrong with your BCM?