[Gmecm] gm 92 riv prom chip

[Jay Vessels]

Hi there!

I have an '89 Eldorado shop manual, which is an E-body car like your Riv 
(though a bit older).  If I can dig it up, I'll see what I can find.

The problem is that the EEPROM that contains the odometer mileage is not 
in the ECM ("computer").  It's in either the BCM (another computer) or 
the IPC (instrument panel cluster, yet another computer).  Replacing the 
ECM won't do you any good  -- it's more-or-less not involved in the 
IPC's displaying the odometer.

Search through that manual (by the size, I'm assuming the Helm manual?) 
and look for "BCM" and "IPC" and see what you find.

If you take your car to a GM dealer, they'll take the IPC out and send 
it off for remanufacturing.  I don't know if the original mileage will 
still be there or not.  If not, then the title to the car may have to be 
marked "unknown mileage" if you try to sell it (going by my experience 
in KY).

Good luck,
Jay Vessels
1982 Chevrolet S-10 Sport, 2.8V6 TBI
1984 Chevrolet S-10 Blazer Sport, 2.8V6 (TBI pending)


kc wrote:
> my 4" thick manual only shows ONE behind the dash. It is held in place 
> with TORX screws and rather small.
> 
> SSO....if I replace the computret behind the glove box might my problem 
> disappear?
> 
> I CANNOT reset the BCM codes when I get them thru the system
> 
> I don't trust GM to diagnose the problem w/o costing me a FORTUNE
> 
> I *did* win a new computer (a steal at $9.95)
> 
> If you go to partsamerica.com and punch in my 92 riv there is the one 
> computer starting with (from memory) 16... and that is the one I won
> 
> kc
> 
> ----- Original Message -----
> From: "Scott Pearson" <mrcad472 at iowatelecom.net>
> To: <gmecm at diy-efi.org>
> Sent: Wednesday, August 08, 2007 9:27 AM
> Subject: Re: [Gmecm] gm 92 riv prom chip
> 
>> ----- Original Message ----- From: "kc" <kctobyjoe1 at verizon.net>
>> To: <gmecm at diy-efi.org>
>> Sent: Tuesday, August 07, 2007 7:38 PM
>> Subject: Re: [Gmecm] gm 92 riv prom chip
>>
>>
>>> there is only 1 computer in this ride has 3 connections
>>> not taking it out until i have a replacement i won on ebay
>>
>> There's going to be more than one computer in this car. Without 
>> looking at the schematics, I'm going to guess 5-7 individual modules. 
>> The PCM (under the passenger side of the dash) and the BCM (behind the 
>> glove box) both have 3 connections. The two black ones will be the 
>> same, but the colored one will be different. I think a 92 will have 
>> red on the BCM and green on the PCM.
>>
>> Scott
>>
>>
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