HUD Troubleshooting
Thread Starter
Racer
Joined: Mar 2016
Posts: 312
Likes: 6
From: Florida
HUD Troubleshooting
My HUD has quit working. Is there a separate fuse just for the HUD display? Don't see it listed in owners manual. The display motor is still working so thinking it's not the fuse. When I shine a flash light down at the display I don't see anything. What are the steps to take to determine why I have no display? I've had a towel over the top of the dash, could this have had any affect? Thanks for you help in advance.
Team Owner
Joined: Jul 2012
Posts: 34,479
Likes: 531
From: Central PA. - - My AR15 identifies as a muzzleloader
I believe in the Beer Fairy
You're probably going to have to pull the dash (not a big deal) to see what's going on. If you have power to the cluster, you should have power to the HUD.
It's doubtful any wires came off. The projector itself could have died, though I think that's rare. They're 'fairly' cheap. The power supply on the cluster could have died. That would give you no display even with a working projector. There's any number of possibilities, but I'd lean toward the projector itself or the power supply (easily replaceable in both cases) just due to the fact you have no display.
I suppose it's possible it could be your switch. Have you checked that?
It's doubtful any wires came off. The projector itself could have died, though I think that's rare. They're 'fairly' cheap. The power supply on the cluster could have died. That would give you no display even with a working projector. There's any number of possibilities, but I'd lean toward the projector itself or the power supply (easily replaceable in both cases) just due to the fact you have no display.
I suppose it's possible it could be your switch. Have you checked that?
Melting Slicks
Joined: Nov 2005
Posts: 3,322
Likes: 141
From: Green Valley Arizona
If you need a HUD projector to troubleshoot yours or for a replacement, I have one sitting on a shelf. Send me a PM.
Oh and I agree, taking the dash top off is not all that difficult.
Later
Oh and I agree, taking the dash top off is not all that difficult.
Later
Thread Starter
Racer
Joined: Mar 2016
Posts: 312
Likes: 6
From: Florida
Thanks for the responses. Do I have to remove dash pad to have access to off/brightness switch?
Team Owner
Joined: Jul 2012
Posts: 34,479
Likes: 531
From: Central PA. - - My AR15 identifies as a muzzleloader
I believe in the Beer Fairy
To remove it, yea, more or less you'd have to pull the dash pad. But that's only if you wanted to check the switches with a meter. I really don't think the switches are known to fail. They're just not something you mess with every day.
Melting Slicks
Joined: Aug 2013
Posts: 2,491
Likes: 315
St. Jude Donor '15-'16-'17-'18-'19-'20-'21-'22
The consensus is that there is no "hud fuse".
Last edited by laurent_zo6; Feb 8, 2017 at 01:46 AM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Pro
Joined: Aug 2005
Posts: 503
Likes: 50
From: Bradenton, FL
More than likely the pin holding the mirror has given way and the HUD is still displaying fine. Start here -> https://www.corvetteforum.com/forums...d-display.html
This should give some perspective on performing the repair.
This should give some perspective on performing the repair.
Heel & Toe
Joined: Aug 2016
Posts: 18
Likes: 0
From: Arkansas
I did have new belts and a power steering hose installed last week and it was dead first time I took it out, didn't notice when leaving the repair shop if it worked then, it was several days later.
They could have killed power for some reason, but can't think of why they would have for those maintainance issues.
Melting Slicks
Joined: Nov 2005
Posts: 3,322
Likes: 141
From: Green Valley Arizona
Cohdad: I suggest making sure the brightness switch is up all the way, turn ignition key to ON, then look down into the HUD mirror to see if you see the display lit up. You could also hold the position button and watch & listen to see if the mirror motor moves.
If you see the display or hear the mirror motor move, then HUD has power. And if it does have power then you can probably determine if it is the mirror pivot that has broken.
Good luck.
If you see the display or hear the mirror motor move, then HUD has power. And if it does have power then you can probably determine if it is the mirror pivot that has broken.
Good luck.
Heel & Toe
Joined: Aug 2016
Posts: 18
Likes: 0
From: Arkansas
Cohdad: I suggest making sure the brightness switch is up all the way, turn ignition key to ON, then look down into the HUD mirror to see if you see the display lit up. You could also hold the position button and watch & listen to see if the mirror motor moves.
If you see the display or hear the mirror motor move, then HUD has power. And if it does have power then you can probably determine if it is the mirror pivot that has broken.
Good luck.
If you see the display or hear the mirror motor move, then HUD has power. And if it does have power then you can probably determine if it is the mirror pivot that has broken.
Good luck.
Thank you very much and will do that next time out in it. If it does not have power do you have any advice as to my next step before taking it to a shop. I don't mind getting into it a bit myself, but electronics are not my strongsuit.
Pro
Joined: Aug 2005
Posts: 503
Likes: 50
From: Bradenton, FL
I'm not sure looking down into the unit will tell you if its just the mirror. Mine was a mirror issue, but when I looked down into the unit, I couldn't see any display...
I wasn't smart enough to listen for the motor though... Luckily it was the mirror. Honestly, I haven't heard or read about many flat out electronically failed units... If it is electrical, either a fuse (no one knows which one) or the unit will be out. Unlikely to be a wire in the middle. If all of your fuses are good, then the unit will need to come out either way to fix...
I wasn't smart enough to listen for the motor though... Luckily it was the mirror. Honestly, I haven't heard or read about many flat out electronically failed units... If it is electrical, either a fuse (no one knows which one) or the unit will be out. Unlikely to be a wire in the middle. If all of your fuses are good, then the unit will need to come out either way to fix...
Melting Slicks
Joined: Nov 2005
Posts: 3,322
Likes: 141
From: Green Valley Arizona
A bit late getting back to this thread; but if the HUD problem is the mirror pivot you will see the display by looking into the HUD area from outside. The display is on the driver's side of the HUD unit so you do need to look a bit sideways to see it, but it is there.
And only way to repair the HUD mirror pivot is to remove from the dash. It sounds like a huge task, but it really only takes about 30 minutes. Just takes notes or pictures of what screws go where. Only tricky part is getting the connector off of the emergency flasher switch.
Also I have not read about any HUD unit failing electrically, only the mirror pivots. Doubt that you will find a shop that will repair the pivots, R&R the HUD yes. So if this is the route you take, I still have the fully working HUD unit sitting on a shelf.
And only way to repair the HUD mirror pivot is to remove from the dash. It sounds like a huge task, but it really only takes about 30 minutes. Just takes notes or pictures of what screws go where. Only tricky part is getting the connector off of the emergency flasher switch.
Also I have not read about any HUD unit failing electrically, only the mirror pivots. Doubt that you will find a shop that will repair the pivots, R&R the HUD yes. So if this is the route you take, I still have the fully working HUD unit sitting on a shelf.
Le Mans Master
Joined: Oct 1999
Posts: 6,366
Likes: 34
The VFD is on the drivers side, aimed towards the passenger side. It is housed inside a plastic housing. You cannot see it straight on. You have to look to the side where the 45* mirror is (by the defroster vent). There is a small window there to see it. You will probably have to bend down as low as you can, yet be able to still see inside.
This is assuming the movable mirror has fallen off the plastic pins and is no longer picking up the VFD image.
I don't think there is any fuse because it is getting power off the cluster.
If it no longer works, you have to figure out if it is the cluster, or the hud unit itself that gave up.
If it is the mirror, remove, disassemble, and replace the pin with a tiny screw. Someone on here did a write up somewhere on this.
Last edited by bill mcdonald; Feb 14, 2017 at 10:21 PM.
Le Mans Master
Joined: Oct 1999
Posts: 6,366
Likes: 34
Heel & Toe
Joined: Aug 2016
Posts: 18
Likes: 0
From: Arkansas
Cohdad: I suggest making sure the brightness switch is up all the way, turn ignition key to ON, then look down into the HUD mirror to see if you see the display lit up. You could also hold the position button and watch & listen to see if the mirror motor moves.
If you see the display or hear the mirror motor move, then HUD has power. And if it does have power then you can probably determine if it is the mirror pivot that has broken.
Good luck.
If you see the display or hear the mirror motor move, then HUD has power. And if it does have power then you can probably determine if it is the mirror pivot that has broken.
Good luck.
Finally made some time to investigate this yesterday and the HUD was working fine, just simply came back on. In all honesty I don't remember if I may have been wearing a particular pair of sunglass clip ons I know blocks it the time I thought it wasn't working. HMMMM, I sometimes don't like being an old guy
