DIGITAL Cadillac IP swap into GMT400

[AuroraGirl]

Ooooh I want one of those wonder if it'd work with the Vortec PCM tho...

Well, it works on the oldsmobile i have and that they came in by serial data from the PCMs that used PROM chips. So not the vortec PCM.

 

[AuroraGirl]

The 1986 Cimarron came with a i4 and a v6, could the PCM for a v6 run a v8?
like mentioned, if its batch fire, the batch fire could probably run TBI

 

[Scooterwrench]

The 1986 Cimarron came with a i4 and a v6, could the PCM for a v6 run a v8?
like mentioned, if its batch fire, the batch fire could probably run TBI

I looked at the .bin file for an '86 A body with 2.8L and MPFI and there was no parameter to select number of cyl's or cyl. displacement, seems those ECM's were application specific.

 

[89k25004x4]

Reviving this thread... with some... news.

I have acquired an '84 C4 Corvette Digital IP and switch panel from my local scrapyard. I have ZERO faith in this thing being functional, as I know this cluster has been been exposed to the elements for at minimum a year. Snow, ice, rain, all of it. It's seen it. So far I've got no signs of life to it... Looking at it you'd expect that. Hopefully I can work some sort of miracle to get it working.

You must be registered for see images attach

I will get a nicer IP and Switch panel when one pops up instead of putting these ugly things in my truck. Cluster only has 90k miles on it, which is rather sad, considering the kind of condition the car is in now. It did catch fire, so I guess that explains the mileage being so low.

 

[Jake_Caulley]

There's 2 in my local yard. They both have the clusters, but both look like they've been on fire. That or the plastic is oxidized like old car headlights in the sun for too long. Perhaps I can fix that. I'll pick it up next time I'm out there. If memory serves correct, the Firebirds also had a digital cluster. I'm also pretty sure that it's an oddball shape, so it wouldn't fit regardless.

Thanks for your help!

Edit:
I'm just starting to look at the wiring diagrams for the C4 cluster.... this is NOT going to be fun to wire up. If I want all of it to work I will have to custom install all the sensors that the corvette has that the trucks don't.
For example....
Ambient temperature sensor
Oil temperature sensor
Cruise control interface
Many more...

Though, there is good news. All of the readouts for vitals (OP, Volts, temp, tach, etc. is all ran off their own inputs, and NOT controlled by serial data. Looks like it also gets it's speed signal from the ECM. Here's my diagrams I'm looking at:

You must be registered for see images attach

You must be registered for see images attach

This is going to take a lot longer than I thought....

I own an 85 C4 and can probably answer a few questions about the dash.
The early C4 "Atari" dash gets the speedometer signal directly from the speed sensor in the transmission. If you want to use the oil temperature, I would suggest getting the one from the car you got the dash from. I don't believe there are aftermarket replacement sendors for that. There is no ambient air temperature feature for the dash.
The cruise control is run by the dash in early C4s. The speed on your wiring diagram is an output- the ECM would use it for either the TCC in the autos or the electronic overdrive in the 4+3 manual.

 

[1998_K1500_Sub]

OMG, the Cimarron.

Here's one that sold recently, the instrument cluster and the car that comes with it.

No Reserve: 15k-Mile 1987 Cadillac Cimarron

Bid for the chance to own a No Reserve: 15k-Mile 1987 Cadillac Cimarron at auction with Bring a Trailer, the home of the best vintage and classic cars online. Lot #159,327.

bringatrailer.com

 

[Scooterwrench]

OMG, the Cimarron.

Here's one that sold recently, the instrument cluster and the car that comes with it.

No Reserve: 15k-Mile 1987 Cadillac Cimarron

Bid for the chance to own a No Reserve: 15k-Mile 1987 Cadillac Cimarron at auction with Bring a Trailer, the home of the best vintage and classic cars online. Lot #159,327.

bringatrailer.com

I think that's when Cadillac wanted to make a small car, didn't go over so well because people wanted a real Cadillac. Now they're all small little P'sOS.
The emblems in the tail lights on that one look like thunder chicken emblems.

 

[89k25004x4]

I own an 85 C4 and can probably answer a few questions about the dash.
The early C4 "Atari" dash gets the speedometer signal directly from the speed sensor in the transmission. If you want to use the oil temperature, I would suggest getting the one from the car you got the dash from. I don't believe there are aftermarket replacement sendors for that. There is no ambient air temperature feature for the dash.
The cruise control is run by the dash in early C4s. The speed on your wiring diagram is an output- the ECM would use it for either the TCC in the autos or the electronic overdrive in the 4+3 manual.

Thanks for the info. The wiring diagram I posted was for an '89, and the '84 diagram is vastly different. I'm getting my diagrams from this website, which is an awesome website I found looking for some wiring on my Volvo. It's a great website with a lot of makes and models. Here's the diagrams it lists for the '84.

You must be registered for see images attach

You must be registered for see images attach

You must be registered for see images attach

Big surprise though.. my cluster doesn't power on. Looking inside it, it looked quite dusty and dirty. I cleaned the boards and threw it back together and it still didn't light up. Whenever I connect the "Memory power" wire I do hear a click from something, but nothing else happens other than that. Maybe I'm missing a ground or something.. But I would think at least something would happen. My switch panel is functional, all of the switches work, but NONE of the illumination works. Even feeding 12v directly to the bulbs doesn't work, which is interesting. I'll continue playing with it and see what I can get working and update it here.

And about getting the oil temp sensor.. the engine from that car is long gone. You can buy a new one on rockauto for $31... but then there's the question of, where do I put mine?

Thanks again for the info. Any more you may have on the '84s, feel free to share.

 

[Jake_Caulley]

Batee has a bunch of info about the digital dash. They also sell the parts to repair them and offer a repair service.
Link to the info: https://batee.com/pages/84-89-corvette-service-parts-and-information

 

[murphy455]

You must be registered for see images attach

This could be a problem for you, your truck uses a 0-90 ohm resistor so the gauge may work but it will give a false reading. You may be able to compensate by adding a 30 ohm resistor to your adapter harness inline with the fuel sensor wire.

I have 6 91 clusters with 3 matching harnesses which would be much simpler