I've got the Zo6 screens on my ride how do I adjust the fog lights through the screen.....!

 

Fog Light Adjustment:
Insert a TORX® driver through the front fascia deflector access hole to reach the fog lamp vertical adjustment screw.
Place the vehicle on a level surface 7.6 m (25 ft) away from a target screen.
Adjust the fog lamp up or down until the top edge of the high intensity zone on the screen is 102 mm (4 in) below the horizontal center line.
Turn OFF the front fog lamps. (Oldvetter)

 

Got it thanks......!

 

I thought Z06's did not have fog light's? Because foglight's are redundant with screens? Rob

 

Good info - thanks.

 

He probably has them on for cosmetic reasons. Fogs can still emit light through the screens. Especially HID fogs.

 

True dat, fine Sir!

They work well through the screens. The PITA is cleaning them.

 

Fog Lamp Aiming

There is no horizontal aiming for the C5 foglamps

Preparation:

Prepare the aiming area. You can use the garage wall providing its at least 25’ from the car and the ground is level. Make sure the tire pressures are correct and the tank is full or the calibration may be out. Park the vehicle square with the aiming surface. Close the doors and rock the car to stabilise the suspension.

Mark some calibration lines using chalk or masking tape:
Find the center of the headlight and measure the distance to the ground. Mark a horizontal line on the surface (garage door or wall) using masking tape at the same distance from the ground.
Stick a piece of tape in the center of the windscreen and another on the rear glass to use as reference marks.
Line these up from behind the car and use them to mark the centerline of the car on the wall.
Measure the distance between the center of both headlight lenses and use this to measure from the center point you just marked on the surface.

Adjustment

Raise the hood.
Raise the headlamps.
Turn ON the low beam lamps. Block the light from both headlamps to allow you to adjust the fog lights. Don’t cover the headlights or they may get too hot.
Turn on the fog lamps

Insert a torx driver through the front fascia deflector access hole to reach the fog lamp vertical adjustment screw



Adjust the fog lamp up or down until the top edge of the high intensity zone is 4” below the horizontal centre line.



Turn off all the lights


Thanks to Junkman for his pics

 

Great explanation, but how do you do it if the car has Z06 screens? Mine doesn't because it's a coupe haha, but for "screened" cars, how do you take the screen off?

 

Damn, the lens in the picture looks as pitted as mine.

 

I believe the Z06 screens on the stock car are screwed into the fender.

You can take out the lower access panels to get to the foglights. Some prefer to go in around the headlights but this would be one job where I'd go in from underneath.

Heres a post for changing the DRL bulb but it shows how to get in there

You'll get three suggestions

Go in through the brake ducts - not easy with a Z06 or if you have screens

Go in through the bottom by taking out the bottom panel



The one that works for me is:

Turn on the headlights and back off one position to kill the lights.
Unscrew the 3 small screws on the black plastic housing around the headlight. Gently pull the housing clear. Reach down around the headlight unit and release the bulb holder. It comes out by turning the bulb holder a ¼ turn counter clockwise but it has a plastic clip which you need to squeeze to release it. Here’s how the bulb fits into the lamp unit. The DRL bulb is the lower of the two.



Here’s the light socket. This one’s after market but it gives you the idea. You can see the clip you need to squeeze.



BTW, if you ever need to replace this socket the part #s are GM 12083689, AC Delco LS15 or Dorman 85882 (Thanks to UM Rebel)

Change the bulb. It’s a push fit into the lamp holder. Push it home firmly but don’t handle the glass. Use latex gloves if you have them. Reseat the bulb holder and turn clockwise until it clicks back in place. Put the plastic headlight housing back in place making sure to locate the small plastic tab in the bracket on the headlamp cover. Replace the 3 screws and close the lights.

It’s a 10 minute job. Some guys have had the lights close if they’ve taken a while to do the fix. If you’re worried about that, disconnect the battery once the lights are up.

The bulb is a 4157NA

Some guys with big arms remove the hood adjusting screw for better access. Guys with even bigger arms have had to take off the headlight cover. Four torx screws (2 back, 1 each side). Take the back ones off first with the lamps down. Raise the lights and take the side ones out.

 

You'll more than likely have to remove the screens to adjust. I doubt you'll be able to get a torx bit through the small openings.

http://www.c5forum.com/diy/fog_lamps.php

 

OK I keep seeing reference to the 25ft from headlight aiming screen. I don't want to buy one can someone just tell us how far off the ground the cutoff should be at 25ft? While your at it the same for the headlights. Oh DeeGee's directions are wrong too the fog lights come on with the parking lights so you do not need to cover the headlights. At least they do on my car.

There are also Torx screwdrivers that should fit through the screen.

 

Not quite wrong, but you're right; it's easier just to back off the switch to the park position which turns off the lights:

Turn to parking lights - headlight cover down, fog lamps on
Turn to Headlights - headlight cover up, headlights on, fog lights on
Turn to parking lights - headlight cover up, headlights off, fog lights on.

It depends if you want to adjust the fog lights from above or from below. If you plan to go in through the headlight shroud you need to raise the headlights. If you go in from below take your choice.

I'll edit the advice.

 

Here Ya Go!

 

There is no adjusting from above therefore no need to even raise the headlights to do the fogs. Explain how you do it through the headlight shroud.

 

This got complicated and I hope I haven't confused anyone. As always, just trying to help.

To answer your question I wouldn't but its possible.

If I'm wrong, then GM is wrong. As with all my How To's I try to base it on the service manual procedures plus any of my own experiences. Thats how the Service Manual says to do it (cover the headlamps). I agree that there doesn't seem to be any reason why you cant back off the headlights to park rather than cover them. As with all these things if you prefer another procedure; no problem.

I agree, the easiest way to adjust the fogs is from the front. thats what I said in my original post.

My screens are after market so I can remove them. The stock Z06 screens are screwed to the fender so harder to get out but its still possible.

The video above is great. If you have a long shaft torx driver thats a great way to do it. I don't but then I dont need one as I can pull the screen. The OP has fixed screens so he has a problem. Not seen that tool before so problem solved. Thanks slvrz06.

As with DRL bulbs (my additional post above), it's possible to get access to the fog light by removing the lower access panel or the headlight shroud. Thats how you change the bulb. I don't recommend that method because the foglight sits tight to the fender screen and its very difficult to get to the adjuster as its on the front face. (see picture)

So if anyone decides they cant remove the screen or go in from the front, I guess there are other, albeit difficult, options. It would probably mean loosening the attaching bolt, making the adjustment and tightening the bolt.

But now thanks to slvrz06 we all know how Z06 owners adjust them.

I'll retire hurt now as I don't wish to generate an argument.

 

Ah I get you DeeGee yes doing both BULBS is very doable by removing the headlight bezel. I was not trying to be an azzhat but trying to keep it simple and not confusing. Turn on parking lights, Adjust with torx screwdrive, Done.

 

Now that's what I'm talking about THANKS.........!