1999c5gremlins

1999 C5, DIC not functioning any, none of the buttons do anything. Could this possibly be a fuse? Is the DIC only a display unit? I know you can use it to pull codes and diagnose, but is it displaying information gathered from other modules?

cadillac531

I have the same thing going on with this 98 I just acquired. From what I understand, it' the IPC (Instrument Panel Cluster) that has gone bad. The DIC just displays the information from the data the IPC collects.

If I'm wrong someone else will probably chime in, but you'll have to switch out the IPC.

RazinKane69

Following. Having the same problem with my 98. The little light at the top of the cluster also isn't functioning on mine. But the DIC is showing other prompts.

Bill Curlee

YES, the IPC is fused. Find the fuse/s and use a DC Voltmeter and TEST the two test slots on top of the fuse/s. Measure both test slots to chassis ground and you need to see full battery voltage at each slot. If its low or nonexistent, your ignition switch is most likely bad. I don't have my schematics at work so, I don't remember if the IPC is powered by more than one fuse or not.



If power is good,, The IPC is an assembly of MODULES. Remove it and disassemble the back cover. You will see that there are lots of plugs/ribbon connectors and slide in parts that can come loose or just need reseating. Make sure that the main connector on the back of the IPC is properly connected also..

Give that a shot before you get to involved in parts swapping.

NO ONE has internal IPC schematics so, if that doesn't fix it, its time to get a good used IPC from Marc at VETTENUTS

Bill

cadillac531

That's some good information. Thanks for sharing. I have been trying to find information on the DIC not functioning and all I've been finding is the IPC needs to be swapped out.

I'm glad to hear something different.

1999c5gremlins

Thanks for the info, I will double check the fuses and I just replaced the ignition switch, that is why I decided to go ahead and try to fix the DIC while I already had some of the dash apart. Hopefully just loose or dirty connections. Please excuse my ignorance I have never had the dash apart, where is the assembly of modules located?

Bill Curlee

Inside the IPC Just remove the IPC and disassemble it.

Bill

1999c5gremlins

Thanks. Will post when I find out

Bill Curlee

Check out these post:

- C5 Gage Cluster disassembly - http://forums.corvetteforum.com/c5-t...post1570380674

- C5 Gage Cluster Post - http://forums.corvetteforum.com/c5-t...post1570380878

j99vette

Mine went bad in my 99 as well. I bought a used one from a 00 for $100 from the big online selling place and swapped the chip in this thread http://forums.corvetteforum.com/c5-t...post1570380674. Everything works like it should now and my mileage is what it should be. Looking at the IPC apart it will take someone way smarter than me to figure out what causes them to go bad without a schematic. I couldn't find anything obvious.

CJ1957

Just this last week my HUD completely quit after I traveled over a high and rough railroad crossing. I dismantled the console to remove the IPC and sure enough the ribbon cable from the HUD that connects to the top rear on the IPC was not seated all the way. I re-seated it and the HUD worked again. Worth a try. If I remember, there is one large connector cable coming from the chassis and two side cables connecting the two IPC halves.

Link to removing IPC: http://www.vetteessentials.com/instr...zel_howto.html

wvufan1965

My GF saw the title of this post and her reply was,

"does he need viagra?"

It took me a second to figure out what she meant jumping from the acronym of Driver Information Center. LOL

No more looking at CF posts for her.

1999c5gremlins

I removed the IPC and checked for loose connections, and everything was tight. I ordered a replacement IPC from Marc@vettenuts and swapped the boards and now everything works as it should, the only thing left to do before I put it back together is take the boards and have the eprom chips swapped so the mileage will show correct.
A big Thank you to Marc@vettenuts, would highly recommend them.

Phinstr

I just replaced the multi switch in the car and now the DIC buttons don’t work (they do light up when the headlights are on). All I have is my odometer reading. I checked fuse 19 and there is 12.2v to ground. The car does not have a fuse in position 25. I do not have a HUD. Would seem like a strange coincidence that the DIC/IPC would go out at the same time that I replace the multi switch. Could something have been bumped loose while changing the switch? Any ideas?

C5 Diag

I see you posted this issue as a new thread…which one of the 2 do you want deleted since this is a duplicate post ??