DIC wiring
Thread Starter
Pro
Joined: Nov 2005
Posts: 684
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From: San Antonio TX
DIC wiring
ok...i pulled out the instrument panel to see what the problem with my DIC may be. it doesnt appear to be unplugged or anything. now with a power tester i can see that every wire has power to it except one. the purple one read nothing, not a power or a ground wire. now, all the rest are power except for the gray one, its a ground, im assuming that is normal.
does anyone by vhance know what the purple one should be?
the vette is a daily so it needs to go back together now. but, my question pertains to what i need to do next.
get another DIC setup, or trace the purple wire back to where something is wrong.
thanks in advance for any help.
does anyone by vhance know what the purple one should be?
the vette is a daily so it needs to go back together now. but, my question pertains to what i need to do next.
get another DIC setup, or trace the purple wire back to where something is wrong.
thanks in advance for any help.
Racer
Joined: Aug 2005
Posts: 388
Likes: 6
Originally Posted by tjcleary
ok...i pulled out the instrument panel to see what the problem with my DIC may be. it doesnt appear to be unplugged or anything. now with a power tester i can see that every wire has power to it except one. the purple one read nothing, not a power or a ground wire. now, all the rest are power except for the gray one, its a ground, im assuming that is normal.
does anyone by vhance know what the purple one should be?
the vette is a daily so it needs to go back together now. but, my question pertains to what i need to do next.
get another DIC setup, or trace the purple wire back to where something is wrong.
thanks in advance for any help.
does anyone by vhance know what the purple one should be?
the vette is a daily so it needs to go back together now. but, my question pertains to what i need to do next.
get another DIC setup, or trace the purple wire back to where something is wrong.
thanks in advance for any help.
I think purple wires are Data Link.
Drifting
Joined: Oct 2004
Posts: 1,384
Likes: 8
From: Southwest Virginia
Originally Posted by tjcleary
ok...i pulled out the instrument panel to see what the problem with my DIC may be. it doesnt appear to be unplugged or anything. now with a power tester i can see that every wire has power to it except one. the purple one read nothing, not a power or a ground wire. now, all the rest are power except for the gray one, its a ground, im assuming that is normal.
The DIC is a Vacuum Florescent Display (VFD) which is basically a tube and normally require over 100 volts to operate the display. Most likely if a VFD will not light it is a problem with it's power supply. The display will have an inverter type power supply that will bump the 12VDC up around 100 volts to run the display. It is high voltage but very low current supply. No volts, no display.
If everything else on your IPC works OK like gages and lights then your problem is probably internal in the IPC.
Good luck
Thread Starter
Pro
Joined: Nov 2005
Posts: 684
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From: San Antonio TX
ok sorry thats my fault for not explaining it correctly.
the display works. the DIC buttons do not, the ones on the right of the speedo and stuff. the cluster that says fuel,gauge, E/M, Reset and so forth. those buttons do not work.
the display works. the DIC buttons do not, the ones on the right of the speedo and stuff. the cluster that says fuel,gauge, E/M, Reset and so forth. those buttons do not work.
Drifting
Joined: Oct 2004
Posts: 1,384
Likes: 8
From: Southwest Virginia
Originally Posted by tjcleary
ok sorry thats my fault for not explaining it correctly.
the display works. the DIC buttons do not, the ones on the right of the speedo and stuff. the cluster that says fuel,gauge, E/M, Reset and so forth. those buttons do not work.
the display works. the DIC buttons do not, the ones on the right of the speedo and stuff. the cluster that says fuel,gauge, E/M, Reset and so forth. those buttons do not work.
With the cable hooked up try using a straight pin and sliding it down in the back of the connector beside the wire and checking for volts on each pin while pushing each button. The buttons will probably ground each pin as you push buttons, but you will probably have to have the cable hooked up on both ends before you can see exactly what it is doing. Write down what you see each pin/wire do and you will quickly figure out the switch.
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Thread Starter
Pro
Joined: Nov 2005
Posts: 684
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From: San Antonio TX
that makes since. so you think the buttons themsleves are not functioning. makes sense. now i just need to ge tthe time to do that. i should have thought of that when i had the panel out, i only took readings with a power probe (pos or ground) , but only on the harness.
i am assuming that it is the buttons that are at fault, not the harness, as it does have some sort of power going to it.
i am assuming that it is the buttons that are at fault, not the harness, as it does have some sort of power going to it.
Drifting
Joined: Oct 2004
Posts: 1,384
Likes: 8
From: Southwest Virginia
Here is the diagram for the DIC wiring. It is much better than I thought it would be from what I remember the same HUD wiring cable details was very slim. Anyway, it appears if your wiring colors are the same you should be able to short the Gray and Brown wire and have it to toggle between gages. It looks like if anything happens in the switch (or harness) to break the ground then all buttons will quit working. Since you have voltage on the lines my guess is probably 85% chance bad switch and 15% bad cluster. Short that gray and brown wire and you will know really quick! If it is the switch you can probably open it up and fix it. It has to be a pretty simple switch.
If shorting the gray and brown does not cause the gauges to toggle, then hook up the switch and harness and probe for volts on the brown wire while you press the gauge button. If it goes to 0 volts and the gauge don't toggle your IPC is bad. If it don't go to 0 check the gray wire and make sure it don't come up from 0 when you press the button. If the gray wire comes up then your IPC is not holding the gray wire at ground and you can probably wire it to ground and fix the problem.
Good luck
If shorting the gray and brown does not cause the gauges to toggle, then hook up the switch and harness and probe for volts on the brown wire while you press the gauge button. If it goes to 0 volts and the gauge don't toggle your IPC is bad. If it don't go to 0 check the gray wire and make sure it don't come up from 0 when you press the button. If the gray wire comes up then your IPC is not holding the gray wire at ground and you can probably wire it to ground and fix the problem.
Good luck
3rd Gear
Joined: Feb 2024
Posts: 4
Likes: 0
Same issue
purple- 5v
orange-10v
brown-10v
white-10v
green-10v
red-10v
blue-10v
yellow- said 0 at first then saw 8.1v
black-11.1
trying to track this down would appreciate any help! Dic lights up but buttons don’t work. Also have tested 2 dic controls and nothing changes
3rd Gear
Joined: Feb 2024
Posts: 4
Likes: 0
I figured as much, just got a c5 and trying to fix the little things here and there, just wanted to see if there was any other possibility besides a whole new clusters. Some of the dic harness wires were in fact loose on the dic connection side but fixed those still nothing.. tested volt on all wires and that where I am now.
Safety Car
Joined: Mar 2017
Posts: 3,737
Likes: 924
From: Orlando Florida
I have a spare cluster and a spare set of DIC buttons. Another thread recently pointed out the IPC wiring and the correct connector, so I'm trying to fab a bench harness so that I can maybe test the spare before going to all the trouble to swap it in. If it works and I swap it in, then I'm going to try to power up the original cluster and see if I can find anything like a missing or loose ground or similar. I worry, of course, about the high voltage in the inverter, so who knows where it will end up.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,396
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
NOTHING in the car runs off 10 vdc.
What is the battery voltage reading at the battery??
What is the voltage reading on the IPC FUSE??
There are two test points on all your fuses. Read both test points to ground and see if you are reading the full battery voltage on the fuse. I also recommend load testing that fuse and measuring the voltage to insure it isnt dropping low under load!
Bill
What is the battery voltage reading at the battery??
What is the voltage reading on the IPC FUSE??
There are two test points on all your fuses. Read both test points to ground and see if you are reading the full battery voltage on the fuse. I also recommend load testing that fuse and measuring the voltage to insure it isnt dropping low under load!
Bill
3rd Gear
Joined: Feb 2024
Posts: 4
Likes: 0
NOTHING in the car runs off 10 vdc.
What is the battery voltage reading at the battery??
What is the voltage reading on the IPC FUSE??
There are two test points on all your fuses. Read both test points to ground and see if you are reading the full battery voltage on the fuse. I also recommend load testing that fuse and measuring the voltage to insure it isnt dropping low under load!
Bill
What is the battery voltage reading at the battery??
What is the voltage reading on the IPC FUSE??
There are two test points on all your fuses. Read both test points to ground and see if you are reading the full battery voltage on the fuse. I also recommend load testing that fuse and measuring the voltage to insure it isnt dropping low under load!
Bill
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,396
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
SWITCH 6? Please list the exact code description. BCM CXXXX H, C, HC etc...
You do NOT need scanners to read codes for C5
Follow this video: How To Read C5 DTCs Using Internal Code reader: how to read c5 corvette codes - Google Search
You do NOT need scanners to read codes for C5
Follow this video: How To Read C5 DTCs Using Internal Code reader: how to read c5 corvette codes - Google Search
3rd Gear
Joined: Feb 2024
Posts: 4
Likes: 0
SWITCH 6? Please list the exact code description. BCM CXXXX H, C, HC etc...
You do NOT need scanners to read codes for C5
Follow this video: How To Read C5 DTCs Using Internal Code reader: how to read c5 corvette codes - Google Search
You do NOT need scanners to read codes for C5
Follow this video: How To Read C5 DTCs Using Internal Code reader: how to read c5 corvette codes - Google Search