"Sys"
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Joined: Oct 2005
Posts: 501
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From: Columbia MD
"Sys"
Just took my '94 in to get serviced. The interior dome lights would not turn off. The dealer diagnosed the problem and discovered that an "electronic module" inside the car was bad. The dealer did not have the part and I was told that it was on "national back order." I told the dealer to pull the fuse so that the interior lights would remain off and not drain the battery.
Got the car back from the dealer with the fuse pulled and I am waiting on the part. I am now seeing an occasional message flash on my digital gauge area though. The word "sys" flashes briefly and inconsistently. It flashed when the car was in park and when I stomped on the throttle the other night.
Is this another problem or is this because the fuse was pulled?
Got the car back from the dealer with the fuse pulled and I am waiting on the part. I am now seeing an occasional message flash on my digital gauge area though. The word "sys" flashes briefly and inconsistently. It flashed when the car was in park and when I stomped on the throttle the other night.
Is this another problem or is this because the fuse was pulled?
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
well... a question, do the lights EVER go off? Or would they stay on all the time?
I am betting money you are getting a CCM error because the courtesy timer has given up.
I would recommend you buy a copy of the Helm Factory Service Manual - www.helminc.com - and study the section on the dome light.
I would bet money too that you can get a used one from www.vette2vette.com... that's if you don't find that the door switch is bad.
I am betting money you are getting a CCM error because the courtesy timer has given up.
I would recommend you buy a copy of the Helm Factory Service Manual - www.helminc.com - and study the section on the dome light.
I would bet money too that you can get a used one from www.vette2vette.com... that's if you don't find that the door switch is bad.
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Yes id be looking to the GM service manual as well, but while youre here, get the CCM code and tell us what it is. Ill look it up in the GM service manual for ya and we can move forward from there 
Follow the procedure below and its the Module 1 codes youll be looking for to report to us. 5Y5 on the dash indicates an issue in Module 1 (the CCM) the same as the SERVICE ENGINE SOON light indicates an issue in Module 4.
On a 94/95 you can check the codes with a paper clip as follows:
You short pin "12" to pin "4" and turn the ignition switch to "On" without starting the engine.
The speedometer will display any codes using the same protocol as the 1990-1993 model but there are some changes in the designation for the modules plus additional modules are added:
Module "1" is still the CCM module.
Module "4" is now called the PCM module (Powertrain Control Module) because automatic transmission computer control was added to Engine Control Module in 1994.
Module 7 (on the 1996 model only) is the RTD module. (This is the Real Time Dampening module which replaced the Selective Ride Control module in 1996).
Module 9 is the ABS/ASR module number from 1994 through 1996.
Finally, Module "A", the DERM (Dynamic Energy Control Module --- (the air bag control module) will be requested to show any codes.
Just like the 1990-1993 display, you read the codes on the speedometer (big) and read the module number on the trip odometer (small).
A series of dashed lines for instance “ - - -“ indicates no more stored codes for that module.
A code showing as “C12” for the CCM module (module #1) means no codes are stored. So C12 is a good thing to see.
Again, you can cause the codes to repeat by turning the ignition off for five seconds and then back on.
Turn the ignition off and remove the short to restore normal operation.
To clear the codes,
1. With ignition "off" ground terminal #12 of the DLC (use bent paper clip to connect pin 4 to pin 12)
2. Turn ignition "on".
3. Press trip/odo button on the DIC until 1.7 appears in the trip
monitor area of the instrument cluster.
4. Press eng/met button on the DIC & hold until "---" appears in the
speedometer area of the cluster, this will clear CCM DTC'S.
To clear PCM/ECM codes do the following:
1. Press the trip reset button on the DIC until the desired system is displayed. In this case it will be 4.0.
2. Press trip/odo button on the DIC until the desired diagnostic mode(4.7) is displayed on the trip monitor area of the cluster.
3. Press & hold the eng/met button on the DIC until "---" is
displayed in the speedometer area of the cluster, this will clear PCM codes.
To clear ABS/ASR codes do the following:
Same as above but you’re looking for “9.7” on the trip odo
Follow the procedure below and its the Module 1 codes youll be looking for to report to us. 5Y5 on the dash indicates an issue in Module 1 (the CCM) the same as the SERVICE ENGINE SOON light indicates an issue in Module 4.
On a 94/95 you can check the codes with a paper clip as follows:
You short pin "12" to pin "4" and turn the ignition switch to "On" without starting the engine.
The speedometer will display any codes using the same protocol as the 1990-1993 model but there are some changes in the designation for the modules plus additional modules are added:
Module "1" is still the CCM module.
Module "4" is now called the PCM module (Powertrain Control Module) because automatic transmission computer control was added to Engine Control Module in 1994.
Module 7 (on the 1996 model only) is the RTD module. (This is the Real Time Dampening module which replaced the Selective Ride Control module in 1996).
Module 9 is the ABS/ASR module number from 1994 through 1996.
Finally, Module "A", the DERM (Dynamic Energy Control Module --- (the air bag control module) will be requested to show any codes.
Just like the 1990-1993 display, you read the codes on the speedometer (big) and read the module number on the trip odometer (small).
A series of dashed lines for instance “ - - -“ indicates no more stored codes for that module.
A code showing as “C12” for the CCM module (module #1) means no codes are stored. So C12 is a good thing to see.
Again, you can cause the codes to repeat by turning the ignition off for five seconds and then back on.
Turn the ignition off and remove the short to restore normal operation.
To clear the codes,
1. With ignition "off" ground terminal #12 of the DLC (use bent paper clip to connect pin 4 to pin 12)
2. Turn ignition "on".
3. Press trip/odo button on the DIC until 1.7 appears in the trip
monitor area of the instrument cluster.
4. Press eng/met button on the DIC & hold until "---" appears in the
speedometer area of the cluster, this will clear CCM DTC'S.
To clear PCM/ECM codes do the following:
1. Press the trip reset button on the DIC until the desired system is displayed. In this case it will be 4.0.
2. Press trip/odo button on the DIC until the desired diagnostic mode(4.7) is displayed on the trip monitor area of the cluster.
3. Press & hold the eng/met button on the DIC until "---" is
displayed in the speedometer area of the cluster, this will clear PCM codes.
To clear ABS/ASR codes do the following:
Same as above but you’re looking for “9.7” on the trip odo
Last edited by Casethecorvetteman; Feb 19, 2007 at 03:19 AM.
Thread Starter
Pro
Joined: Oct 2005
Posts: 501
Likes: 64
From: Columbia MD
Oh, forgot to mention guys. The dealer also put a new battery in and recharged the system. The battery was completely gone. Maybe they never reset something?
Can't get to the car to check the codes since I live in a different location than where the car is stored.
Can't get to the car to check the codes since I live in a different location than where the car is stored.
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Well with no code we cant help you any more than we have. Its as simple as that. We have done all we can now, the next part requires the DTCs.
There is nothing to reset when you install a new battery, if you disconnect the battery long enough it will reset everything.
There is nothing to reset when you install a new battery, if you disconnect the battery long enough it will reset everything.
