I've been working on a friend's '97 coupe. The DIC could not be reset, and no DIC switches would work to affect the DIC readout. This has been like this for some time. Car runs fine and all other functions are working properly. Battery voltage apx 12.6.

Friday we installed a new DIC switch assembly, suspecting that being the fault. It did not solve the problem. In the process of troubleshootong, I opened the back of the cluster and checked DIC to switch plug terminals on the ckt board and associated circuitry using a eyloop and all looked ok. No cold solder anywhere.

It is now however intermittent. His Oil Life Monitor was still reporting "Change Oil Now", and I used the Fuel Pedal Reset sequence to clear that.

After doing that, the DIC started to work. All buttons appeared to work and activate the DIC properly. We then disconnected the battery to put everthing back together, and of course now we are back to the intemittent operation. Sometimes the E/M switch works.

Is the digital electronics for the DIC located in the cluster, or the BCM?

Grounds? I would think that the DIC ground is ok as the entire cluster ground is likely ok if all gauges, speedo, tach, etc are ok.

Are there other areas that I should consider to be at fault? Or are we looking at a new Cluster or BCM?

Thanks,
Rich
p.s. There is what appears to be a Led or Light at the top of the DIC switch panel. That never lights. Should it?

 

Can' help with the intemittent DIC prolem but what looks like a LED is the interior temp or light sensor (can't remember which). It does not light up.

 

Thanks........I thought it was a indicator of some sort..........

I took the old one apart to see it up close and get the pinouts for the next time. Simple Hall Effect switches like everything else these days. Obviously negative trigger for the electronics. Notice that the indicator lights are replaceable from the back of a assembled switch. I didn't show the front of the switch as we all know what it looks like.

Here's the pinout if anyone needs it in the future.....Pin 1 is the top pin when the switch is installed. Pin 10 towards the floor. Unfortunately I forgot to write the wiring colors down the other day.

Pin Function
--- ---------
1- Sensor trigger
2- Ground/Common to all Switches
3- Fuel(sw1)
4- Gages(sw2)
5- Trip(sw3)
6- Options(sw4)
7- E/M(sw5)
8- Reset(sw6)
9- Indicator lights (+/-)?
10-Indicator lights (+/-)?

 

Just for extra info, put a meter across the battery when the ignition is off and tell us what you've got. Your reported 12.6 is on the hairy edge of the absolute minimum of 12.5 for the computers to even run. You need to get the power up there for things to work right.

 

....good idea. I'll have him check it again. I suspect it may be a bit higher than 12.6 now, as I measured after a while during debug. After he left and ran the car a while I think it got recharged, but worth another look.

 

I am having the same problem, I am thinking of just replceing the whole switch, did you evere get the thing working?

 

I replaced the switch, and it is still not working right. We are getting some functions working but it is intermittent. Some things work and we even stepped through the diagnostics once. The RESET button never works though. Very frustrating.......We reset the oil life monitor by doing the gas pedal reset i.e.(Ign-on, floor pedal 3 times). Voltage at the battery is 12.8 so that is ok.

When I had the cluster out, I checked as much as I could but saw no obvious problems. I am still unsure where the digital electronics is located for the DIC. I would imagine it's part of the cluster control circuit board(behind the gages), and that the problem is there. No one ever responded with the answer to where the DIC logic is located.

We're still diagnosing on occasion. Monday he's back in town and I'm planning to check a few more areas. First up is to check and clean all ground connectors, especially in the engine bay. I'll reply back with any results after that.........but my gut tells me the circuit logic in the cluster(if there?) for the DIC is the problem.

 

I am having similar problems with the DIC, Recently my DIC started to randomly display all the various pages (temps, tire pressures, etc) on its own. It periodically changes the display to a new one as if the buttons were being pressed. The buttons themselves are not functional so I have no control over the display. I have tried cleaning the general chassis ground connectors as described in the post and they were in good shape.

How did you get access to the DIC button panel, does the whole dashboard assembly need to removed? Any pictures or links to DIY would be appreciated.

 

Yes, starting at the center console then up into the cluster. I used this procedure. It's how to change gauge bezels but it gets you there. After I did it once it's now easy!...excellent write up.

http://www.vetteessentials.com/instr...zel_howto.html

 

My '99 just started doing the same thing yesterday for the first time. So far its only the GAUGES button that comes on all on its own and scrolls through all of the readings. If I push another button it stops doing it and it will display the information that the button is supposed to do. All of the information appears to be correct as far as the temperatures and volts go. The tire pressure sensors have never worked since I bought the car a year ago - I just hit RESET each time the car is started to make that warning stop. Please let me know what you find out or how you solved your problem!! Thanks!

 

It appears lots of people are showing up in this thread with similar problems. This is a tough one. Without having detailed circuit diagrams and some diagnostic aids and troubleshooting information, it's like a shooting gallery.

I have a gut feeling the DIC logic is in the cluster circuit board. I'm still trying to figure that out, but for now this is going to be a part time thing for me. My C5 friend uses his car infrequently, and is here in Florida only for the winter months. I have a few months left to help him fix it.....if we ever do.

I'll keep the thread in mind if I ever find it and post the results. I've been restoring a few "non-electronic" Corvettes as of late and like to learn about the "new" Corvettes too! I've owned a '59 for 25 years, and have a '07 base C6 coupe, the ones in my avatar, and have gotten a bit intimate with the '07 over the last 2 years with some interesting issues, thankfully covered by the power train warranty. I now own a OBD2 diagnostic scanner.

Rich
p.s. fyi this is the kind of stuff I also do......http://home.comcast.net/~richmz
Now working on a 67 and a ongoing 1959 project for a friend.