C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

91 dash cluster

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Old Aug 17, 2006 | 10:21 PM
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Default 91 dash cluster

Does anyone know what year dash clusters will fit and work in a 91?
Thanks for any help.
Randall
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Old Aug 18, 2006 | 03:27 PM
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Originally Posted by rcr103
Does anyone know what year dash clusters will fit and work in a 91?
Thanks for any help.
Randall
90-91 with swap directly

92-96 will work if you swapp the LCD with one from a 90-91 there are also a few warning lights that are different.

What is the problme you are having with yours?
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Old Aug 18, 2006 | 05:41 PM
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Originally Posted by -=Jeff=-
90-91 with swap directly

92-96 will work if you swapp the LCD with one from a 90-91 there are also a few warning lights that are different.

What is the problme you are having with yours?
Well to start with the tach pegs and goes bac to 0,with or without the filter,the digitals blink on and off rapidly,and there is no illumination in the back,with or without lights on.
Any thoughts?
Randall
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Old Aug 18, 2006 | 07:21 PM
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Originally Posted by rcr103
Well to start with the tach pegs and goes bac to 0,with or without the filter,the digitals blink on and off rapidly,and there is no illumination in the back,with or without lights on.
Any thoughts?
Randall

Tach makes it sound like a Cluster problem..

The Backlighting could be a bad Photo sensor located on the DIC to the right of the Cluster. The blinking LCD could be a bad CCM, infact all (except the tach issue) could be CCM related.

You should be able to find a cluster on eBay for a reasonable price
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Old Aug 20, 2006 | 10:26 PM
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Originally Posted by -=Jeff=-
Tach makes it sound like a Cluster problem..

The Backlighting could be a bad Photo sensor located on the DIC to the right of the Cluster. The blinking LCD could be a bad CCM, infact all (except the tach issue) could be CCM related.

You should be able to find a cluster on eBay for a reasonable price
Ok,I understand that a 92 -96 cluster does not work with a 91 ccm,if I get a 92 -96 ccm what will I have to do to make it work?
Thanks for any help.
Randall
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Old Aug 20, 2006 | 11:50 PM
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If you want to stay with the orange letters, don't go past 93. They changed to white letters in 94.
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Old Aug 21, 2006 | 08:06 AM
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Originally Posted by rcr103
Ok,I understand that a 92 -96 cluster does not work with a 91 ccm,if I get a 92 -96 ccm what will I have to do to make it work?
Thanks for any help.
Randall
to make a 92-96 work you need to:
Swap the LCD from your 90-91 cluster.
you also need to cut and modify some of the Circuit board routing to work the correct Idiot lights.
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Old Aug 21, 2006 | 09:19 AM
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Originally Posted by -=Jeff=-
to make a 92-96 work you need to:
Swap the LCD from your 90-91 cluster.
you also need to cut and modify some of the Circuit board routing to work the correct Idiot lights.
What if change out the ccm also?will i still have to reroute the circuit board?
Thanks,
Randall
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Old Aug 21, 2006 | 09:35 AM
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Originally Posted by rcr103
What if change out the ccm also?will i still have to reroute the circuit board?
Thanks,
Randall
the 92-newer CCM will not play nice with the 91 ECM, No the 92 ECM will not work. Now if you bought a 92 cluster, swapped in your LCD and installed it to VERIFY it will fix the issue, then you do not need to chnage the Circuitboard wiring. those cluster mods for the Circuit board are just to Light up the correct Idiot light. For example when you turn the key, the Seat belt light, might be the brake light instead.
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Old Aug 21, 2006 | 01:19 PM
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Originally Posted by -=Jeff=-
the 92-newer CCM will not play nice with the 91 ECM, No the 92 ECM will not work. Now if you bought a 92 cluster, swapped in your LCD and installed it to VERIFY it will fix the issue, then you do not need to chnage the Circuitboard wiring. those cluster mods for the Circuit board are just to Light up the correct Idiot light. For example when you turn the key, the Seat belt light, might be the brake light instead.
O K thanks,I bought a 94 cluster on E bay for $25 it looks good we'll how it works.
Thanks,
Randall
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Old Aug 21, 2006 | 10:11 PM
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Originally Posted by rcr103
O K thanks,I bought a 94 cluster on E bay for $25 it looks good we'll how it works.
Thanks,
Randall
Good luck
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Old Aug 22, 2006 | 10:06 PM
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Originally Posted by -=Jeff=-
Good luck
While I'm waiting on the new cluster I started checking the old cluster board. Found 2 blown fuses and a bad resistor.Replaced all ,pluged in the cluster,turned on and the digital lights up but it is blank,clean screen,everything else works.ccm? if so how do I reprogram another one,and does the ccm control the a/c control module?
Thanks for any help
Randall
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Old Aug 22, 2006 | 10:16 PM
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Nothing on the digital display lights at all? when the key is first on there is a blanking control, lights all the LCD pixels.

Sounds like it could be the CCM (dealer item only)
what is wrong with the AC?
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Old Aug 22, 2006 | 10:25 PM
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Originally Posted by -=Jeff=-
Nothing on the digital display lights at all? when the key is first on there is a blanking control, lights all the LCD pixels.

Sounds like it could be the CCM (dealer item only)
what is wrong with the AC?
Yes the screen lights up but there are no numbers or anything,just a blank orange screen,for the a/c the buttons are not controlling the functions,seems to be stuck in auto.
Randall
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