Question about HUD wiring
Thread Starter
Race Director
Joined: Nov 2017
Posts: 12,759
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From: Prosper TX/Austin TX
2020 C6 of the Year Winner - Modified
Question about HUD wiring
Today was the first day I drove the car after installing a HUD unit. Everything worked fine in the garage yesterday. I played with all the buttons (up/down, bright/dim, mode, etc.) no problems. Tonight, however, I noticed when the headlights came on the HUD disappeared. I’ve searched & read this is not supposed to happen.
* edit: the HUD was actually on when I started driving tonight & the headlights were on. However, I started messing with the +/- buttons and then the display disappeared for the remainder of my drive home.
When I pulled in the garage, I turned off the lights and the HUD popped back up full brightness. I hit the - button & then noticed the + button did nothing & the display would not get brighter.
I also noticed the up/down arrows & Mode buttons are not illuminated with the lights on. Wondering if these symptoms are an issue with the wiring or with the projector/switch themselves? Thanks for any suggestions.
* edit: the HUD was actually on when I started driving tonight & the headlights were on. However, I started messing with the +/- buttons and then the display disappeared for the remainder of my drive home.
When I pulled in the garage, I turned off the lights and the HUD popped back up full brightness. I hit the - button & then noticed the + button did nothing & the display would not get brighter.
I also noticed the up/down arrows & Mode buttons are not illuminated with the lights on. Wondering if these symptoms are an issue with the wiring or with the projector/switch themselves? Thanks for any suggestions.
Last edited by JABCAT; Nov 22, 2018 at 11:03 PM.
Racer
Joined: Jul 2017
Posts: 439
Likes: 68
Get out the continuity meter and check connections. At night lights on or off the display should be very bright. Mine only gets washed out on light pavement during mid day. Shine your cell phone light directly at the photo sensor on the hud it should jack up the intensity to confirm sensor is working.
Thread Starter
Race Director
Joined: Nov 2017
Posts: 12,759
Likes: 10,657
From: Prosper TX/Austin TX
2020 C6 of the Year Winner - Modified
Get out the continuity meter and check connections. At night lights on or off the display should be very bright. Mine only gets washed out on light pavement during mid day. Shine your cell phone light directly at the photo sensor on the hud it should jack up the intensity to confirm sensor is working.
Racer
Joined: Jul 2017
Posts: 439
Likes: 68
It’s hard to say without checking continuity to make sure that everything is getting the power that it should be. I had a wire pull out of the harness and couldn’t start the car… I damn near lost my mind, wiring has to be checked before you can go forward
Le Mans Master
Joined: May 2016
Posts: 7,185
Likes: 1,546
From: Florida
Yeah - I haven't done one in a while now, but there is a gray and a brown wire in the dash harness that is commonly confused and the wrong one chosen. They're very close to the same color.
Last edited by BlindSpot; Nov 24, 2018 at 04:15 PM.
Thread Starter
Race Director
Joined: Nov 2017
Posts: 12,759
Likes: 10,657
From: Prosper TX/Austin TX
2020 C6 of the Year Winner - Modified
Im out of town but will pull it apart and check the wiring on Tuesday when I get back.
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Thread Starter
Race Director
Joined: Nov 2017
Posts: 12,759
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From: Prosper TX/Austin TX
2020 C6 of the Year Winner - Modified
this may be the case as a wire did pull out of the harness that plugs into the projector as I was splicing the wires together. I put it back in when got all the wires spliced and ready to go, but the custom wire harness I purchased was almost too short & I had a heck of a time trying to get the blue plug into the switch when I put the cluster back in because it just wasn’t long enough. I’m thinking tugging on the harnes to get the plug to clip into the switch could’ve maybe made that wire loose and after driving for a bit t came out?
Safety Car
Joined: Jan 2001
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From: Boise ID
Could be as simple as the button module connector not fully seated and clicked in. When I installed my hud, all was working until I got the cluster installed, then had nothing. Found that the connector on the projector was not fully plugged in.
Thread Starter
Race Director
Joined: Nov 2017
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From: Prosper TX/Austin TX
2020 C6 of the Year Winner - Modified
Pulled the cluster, checked all the wires & they all seem good. Everything works on the display except the + to increase brightness & the display disappears when the lights turn on?
Thread Starter
Race Director
Joined: Nov 2017
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From: Prosper TX/Austin TX
2020 C6 of the Year Winner - Modified
update: received a new switch and all buttons illuminate however, the HUD display still does not increase in brightness & disappears when the lights are turned on. Ideas on what to check next? Thanks!
Race Director
Joined: Sep 2009
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From: Eastern
It does sound like a wiring issue, and quite possibly a short on that wire for the dimming, or a bad grounding wire from the harness.
It's tough to troubleshoot without being there.
I do have a PDF of the service manual section on Instrument /HUD that may help. It does show all the connectors, wiring etc and troubleshooting guides.
It may help you out. If you want it, PM me your e-mail and I'll send it to you. it's too large to insert in the post.
Good Luck
It's tough to troubleshoot without being there.
I do have a PDF of the service manual section on Instrument /HUD that may help. It does show all the connectors, wiring etc and troubleshooting guides.
It may help you out. If you want it, PM me your e-mail and I'll send it to you. it's too large to insert in the post.
Good Luck
Thread Starter
Race Director
Joined: Nov 2017
Posts: 12,759
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From: Prosper TX/Austin TX
2020 C6 of the Year Winner - Modified
Here’s something I noticed when messing with it last night. With the drivers door open the mirror lights were on. When I would press the up button on the HUD switch, the passenger side mirror light would dim?
Thread Starter
Race Director
Joined: Nov 2017
Posts: 12,759
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From: Prosper TX/Austin TX
2020 C6 of the Year Winner - Modified
