91 ccm replacement
Thread Starter
Instructor
Joined: Jan 2005
Posts: 145
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From: Ft.Worth Texas
91 ccm replacement
What is involved in a ccm replacement,I'm not possitive but I think my ccm has gone goofy,no digitals on screen,just orange ,blank.I'm going to try another known working cluster first,then go from there.
Thanks for any thoughts,
Randall
Thanks for any thoughts,
Randall
Instructor
Joined: Jul 2002
Posts: 172
Likes: 0
From: jax fl
ccm replacement
I fought with my digitial cluster it would go blank, freeze and show gibberish for data. Turned out to be the dirty/loose connections on the lcd panel in the cluster. I would try that as my first option.
Someone recommneded cleaning the connections on the ccm and I went down that path. To get the ccm out you need to disassemble the drivers side bolster and dash center support. The ccm is in a pretty tight space. I did clean the connections to no avail. It is my understanding that once you have it out and go to replace it with a different ccm, it has to be programmed for your car by a dealer (not the gospel but what I read here and in the shop manual for a 91)
I also bought a 94 cluster off ebay and tried it, the 90 and 91 are the same cluster and newer models will not work. A later model cluster will show data but it will not be correct. If you try a newer cluster and get something it may mean your ccm is functional, at least to some degree. According to a post farther down from yours, it is suggested that a later model cluster will work if you swap out the lcd from your 91.
good luck and take none of the above as professional advice, just my hard knocks
Someone recommneded cleaning the connections on the ccm and I went down that path. To get the ccm out you need to disassemble the drivers side bolster and dash center support. The ccm is in a pretty tight space. I did clean the connections to no avail. It is my understanding that once you have it out and go to replace it with a different ccm, it has to be programmed for your car by a dealer (not the gospel but what I read here and in the shop manual for a 91)
I also bought a 94 cluster off ebay and tried it, the 90 and 91 are the same cluster and newer models will not work. A later model cluster will show data but it will not be correct. If you try a newer cluster and get something it may mean your ccm is functional, at least to some degree. According to a post farther down from yours, it is suggested that a later model cluster will work if you swap out the lcd from your 91.
good luck and take none of the above as professional advice, just my hard knocks
Last edited by 1lapRacer; Aug 23, 2006 at 11:20 PM.
Thread Starter
Instructor
Joined: Jan 2005
Posts: 145
Likes: 0
From: Ft.Worth Texas
Originally Posted by 1lapRacer
I fought with my digitial cluster it would go blank, freeze and show gibberish for data. Turned out to be the dirty/loose connections on the lcd panel in the cluster. I would try that as my first option.
Someone recommneded cleaning the connections on the ccm and I went down that path. To get the ccm out you need to disassemble the drivers side bolster and dash center support. The ccm is in a pretty tight space. I did clean the connections to no avail. It is my understanding that once you have it out and go to replace it with a different ccm, it has to be programmed for your car by a dealer (not the gospel but what I read here and in the shop manual for a 91)
I also bought a 94 cluster off ebay and tried it, the 90 and 91 are the same cluster and newer models will not work. A later model cluster will show data but it will not be correct. If you try a newer cluster and get something it may mean your ccm is functional, at least to some degree. According to a post farther down from yours, it is suggested that a later model cluster will work if you swap out the lcd from your 91.
good luck and take none of the above as professional advice, just my hard knocks
Someone recommneded cleaning the connections on the ccm and I went down that path. To get the ccm out you need to disassemble the drivers side bolster and dash center support. The ccm is in a pretty tight space. I did clean the connections to no avail. It is my understanding that once you have it out and go to replace it with a different ccm, it has to be programmed for your car by a dealer (not the gospel but what I read here and in the shop manual for a 91)
I also bought a 94 cluster off ebay and tried it, the 90 and 91 are the same cluster and newer models will not work. A later model cluster will show data but it will not be correct. If you try a newer cluster and get something it may mean your ccm is functional, at least to some degree. According to a post farther down from yours, it is suggested that a later model cluster will work if you swap out the lcd from your 91.
good luck and take none of the above as professional advice, just my hard knocks
Randall
Le Mans Master
Joined: Dec 2005
Posts: 8,969
Likes: 0
From: Bay Area CA
Mine had faulty wiring between the LCD ant the back of the cluster. Fixed it with a paper clip (So the bad wire made contact) when you get the cluster out, youll see how inexpensively they were produced.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
But the 1990-96 clusters are SO much more reliable than the 84-89 IPs.
If the CCM is freaking, the car more than likely won't start... it's what sends the VATS signal to the ECM to start the car... if the CCM was dying a slow death, that would not work. Even with a VATS bypass, it wouldn't read the known good resister.
Also, the ABS/Audio and climate controls might get wacky, too.
If the CCM is freaking, the car more than likely won't start... it's what sends the VATS signal to the ECM to start the car... if the CCM was dying a slow death, that would not work. Even with a VATS bypass, it wouldn't read the known good resister.
Also, the ABS/Audio and climate controls might get wacky, too.
