Took my 2000 coupe out last week for the first time in about ten days. The first two times I turned on the left turn signal, there was a loud "buzzer" noise. I quickly turned it off both times, noise stopped. The third time, and since, no buzzer. It seemed to come from the dash or front of the car, no warnings from the DIC. Any ideas? I am baffled.

 

Sounds to me like the turn signal relay may be going bad. If a relay wears out, sometimes they buzz because the switch inside isn't actually clicking over, but just trying to, hence a buzzing sound. I would replace that. The usually aren't too expensive and it should be a relatively easy fix.

 

The relay would make sense. If it does it again, I will start there and replace it. Thanks.

 

This has happened to me in my '04. The buzzing is coming from a circuit card behind the emergency flasher button. That circuit card controls the turn signals and emergency flasher. To clear the issue, I quickly depressed the emergency flasher button several times in a row. There are other threads on the forum that tell you how to spray contact cleaner in the switch to clear it.

 

There is no circuit card/board related to the Hazard flasher. There are only contacts and the actual flasher which serves the Hazard function and turn signals.

If you determine that the Hazard switch is the source of your problem here is some info to consider.

The reason so many Hazard switches fail is NOT the internal Flasher but the internal contacts that feed it for the turn signal function. A different set of contacts feed the "hazard " function. I can post the schematic for those who can read it. That is why people say when having turn signal issues to try and exercise the Hazard switch by pressing the “hazard” function, thereby helping to swipe the contacts for the turn signals. A temporary fix.

Whenever a “hard/consistent” turn signal issue sets in for either the left or right turn signals it is NOT the hazard switch but the Multifunction switch.

Here are 4 ways to fix a turn signal Hazard switch issue.

1. Remove the console and radio surround bezel and remove and replace the Hazard switch. Cost about $25 for a new switch and can be done in about 1 to 1 1/2 hours. Very easy to do, not hard or really complicated.

After removing the console and radio bezel you need to remove the radio. If you look at your replacement switch you will see the 2 green tabs on the top and bottom that lock it in place. You will be able to see the lower one when the radio is removed. Push up on the lower tab with a screwdriver while pressing in on the lower part of the switch and you can release the lower tab. Now the switch should be angled up on the end where the wiring connects. Now take a large flat bladed screw driver and place it at the top of the switch. Give the screwdriver a swift rap with a hammer. DON’T overdo it, just a reasonable hard hit and the switch will just pop out.

How to remove the console and bezel for access to the radio:
http://www.vetteessentials.com/instr...zel_howto.html

2. Buy a Hyperflash unit for about $65 and install it under the dash. Just requires removing the Knee bolster. About a 1/2 hour job.

3. Buy a used wiring harness that goes from the steering column to the hazard switch. Remove the knee bolster and unplug the existing one and install the replacement. Then install the new Hazard switch on the other end and just place it under the ignition switch where you can access it if you ever need Hazards. Dash will look stock since the old bad switch is still there. Cost is 25$ for switch and about 25$ for used harness. Takes the same time as installing a Hyperflash unit.

Here is info on the wiring harness:

GM P/N 12163776
http://www.corvetterecycling.com/product-p/233776.htm


4. Lastly, this is what I did. A relocation similar to #3 but I used the process in #1 to move the existing wiring harness to beneath the ignition switch where I placed a new Hazard switch. I then reinstalled the old Hazard switch in the dash for a stock appearance.

Here is a link for relocation:
http://forums.corvetteforum.com/c5-t...elocation.html

PS: I see a lot of people do not understand that a Hyperflash mod (and others) only bypasses the turn signal function of the Hazard switch. If your actual Flasher in the Hazard switch is bad you will NOT have the "hazard" function by just installing a Hyperflash. I can go on if needed.

Hope this helps. If you have questions I will try to answer them.

 

Thank you guys, that is a big help.

 

May be a bit skewed to the topic, but I installed a Hyperflash unit a few years ago (for my LED Turn Signal Mirrors - not for a Hazard Switch issue).

I have had my 2001 C5 as a DD for 14 years and have never touched the Hazard Switch (or the horn button, or even the windshield washer switch for that matter!).

Is it just that the stock hazard switches are cheap and the contacts lose their pressure over time or that they wear out from over use?

Guess I need to try mine to see if it works!

 

That is a good question. I think the issue is that just the contacts for the turn signal function get burned from use since they carry the current for the 2 bulbs up front and the 4 in the rear. When you turn the Hazards on they are fed from different contacts. When you cycle the Hazards ON and OFF I think it tends to help swipe the turn signal contacts which is a temporary fix.

Far left contacts are for brake lights. Next set of contacts for the turn signals. Next are the ones for the Hazards.