Is it my multi-function switch or hazard switch?!
Thread Starter
Burning Brakes
Joined: Jun 2009
Posts: 787
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From: Santa Rosa California
Is it my multi-function switch or hazard switch?!
My 2000 has a strange problem. Left side brake lights don't work, but the blinkers and all other lights work fine. This makes me think its the multi function switch..
However, sometimes my blinker stops working and I need to push the hazard switch a bunch of times and it gets going again. But could a failing hazard switch cause this problem?
However, sometimes my blinker stops working and I need to push the hazard switch a bunch of times and it gets going again. But could a failing hazard switch cause this problem?
Race Director
Joined: Apr 2004
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From: Newberry FL
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St. Jude Donor '07
There is a relay you can buy that costs about $50 and it should fix this problem in about 20 minutes of installing. Someone should chime in or you can do a search on this, because I cann't remember exactly what the name is. I know a vendor on here makes them.
Micah
Micah
Tech Contributor
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From: Dyer, IN
Curious to why the hazard switch would be suspect, when only the left side brake lights don't work? The stop lamp switch output, goes through the hazard switch, and supplies 12 volts (on a single wire) to BOTH left and right rears.
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From: South Western Ontario
So, you have 2 problems, the hazard switch causing your turn signals to stop working and the multi-function switch causing your brake lights to quit working.
Peter
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From: Newberry FL
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St. Jude Donor '07
They are connected.*
Go ahead and pay top dollar or do the cheap fix I mentioned. *Up to you. *If you do the search and contact the vendor that supplies the relay he will tell you.
My buddy spent $900 at a steamers up getting the hazard switch, blinker switch and a battery replaced and it did not fix his issues. *I am not a mechanic, but I have had this problem in my 2000, 2001, a buddies 2000 and another friends 2001 and the relay fixed everyone. *$70 is a heck of a lot cheaper and if you are playing the guessing game, and that is what is going on here, because no one knows, $70 is a lot cheaper than the hundreds you may spend swapping everything else out and the install is less than 20 minutes. *http://www.corvette-enhancements.com/c5_flasher_fix.php contact them and tell them what is going on and see what they say.
It is just like the column lock by pass. *The recall came out never completely fixed everyone's problem, but the by pass worked everytime. *It only ran $70 and took 20 minutes. *It's crazy, but true.
Micah
Go ahead and pay top dollar or do the cheap fix I mentioned. *Up to you. *If you do the search and contact the vendor that supplies the relay he will tell you.
My buddy spent $900 at a steamers up getting the hazard switch, blinker switch and a battery replaced and it did not fix his issues. *I am not a mechanic, but I have had this problem in my 2000, 2001, a buddies 2000 and another friends 2001 and the relay fixed everyone. *$70 is a heck of a lot cheaper and if you are playing the guessing game, and that is what is going on here, because no one knows, $70 is a lot cheaper than the hundreds you may spend swapping everything else out and the install is less than 20 minutes. *http://www.corvette-enhancements.com/c5_flasher_fix.php contact them and tell them what is going on and see what they say.
It is just like the column lock by pass. *The recall came out never completely fixed everyone's problem, but the by pass worked everytime. *It only ran $70 and took 20 minutes. *It's crazy, but true.
Micah
Last edited by mph1972; Mar 26, 2011 at 12:57 PM.
Tech Contributor
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From: Dyer, IN
Drifting
Joined: Feb 2008
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From: Bahama North Carolina
[QUOTE=lucky131969;1577167805]Fair enough. Please show me on the schematic below, how the brake light circuit flows, and why it's possible....for the hazard swith to affect the left rear brake lights...and not the right rear.
======================================== ============
Assuming you described your problem correctly, I would listen to Lucky. He knows his stuff better than anyone else on this forum.
======================================== ============
Assuming you described your problem correctly, I would listen to Lucky. He knows his stuff better than anyone else on this forum.
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Tech Contributor
Joined: Jan 2007
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From: Dyer, IN
[QUOTE=BigGun;1577167923]
...thanks for the kind words; however, my knowledge pales in comparison to someone like Bill Curlee. I just try to offer my experience, coupled with my understanding of the schematics, to help people make a logical decison.
Fair enough. Please show me on the schematic below, how the brake light circuit flows, and why it's possible....for the hazard swith to affect the left rear brake lights...and not the right rear.
======================================== ============
Assuming you described your problem correctly, I would listen to Lucky. He knows his stuff better than anyone else on this forum.
======================================== ============
Assuming you described your problem correctly, I would listen to Lucky. He knows his stuff better than anyone else on this forum.
Race Director
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From: South Western Ontario
You are playing the guessing game. Lucky and I are not playing the guessing game because the MFS is the solution for the problem that was described.
Peter
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From: Newberry FL
Cruise-In VIII Veteran
St. Jude Donor '07
You guys can show your flow charts and tell me what is what and I appreciate it sincerely, I am not an electrician nor a mechanic and only speak from past experiences when it came to this hazard switches and blinkers, as well as the break lights and that a new battery, replacement switch, column turn signal switch did not solve a similar problem. I hope you find out your problem. I am not taking anything away from anyone, I offered my advice on what fixed my problem as well as three buddies who had very like problems and the relay did the trick.
Good luck figuring it out and I hope it isn't a pricey repair. I also look forward to hearing what the fix was.
Micah
Good luck figuring it out and I hope it isn't a pricey repair. I also look forward to hearing what the fix was.
Micah
Melting Slicks
Joined: Sep 2006
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From: Redding CA
You guys can show your flow charts and tell me what is what and I appreciate it sincerely, I am not an electrician nor a mechanic and only speak from past experiences when it came to this hazard switches and blinkers, as well as the break lights and that a new battery, replacement switch, column turn signal switch did not solve a similar problem. I hope you find out your problem. I am not taking anything away from anyone, I offered my advice on what fixed my problem as well as three buddies who had very like problems and the relay did the trick.
Good luck figuring it out and I hope it isn't a pricey repair. I also look forward to hearing what the fix was.
Micah
Good luck figuring it out and I hope it isn't a pricey repair. I also look forward to hearing what the fix was.
Micah
I don't know how to read them either but if it doesn't show the brake lights "flowing" through the hazard switch or it's relay..they're not connected.
Is the bypass that you're referring to the hazard switch bypass or could it be something different?
So, 4 people now at least with an issue where ONLY the left brake lights don't work??
@ the op...you're blinkers not working and then working when you push the hazard button a bunch of times definitely points you to having to replace the hazard switch OR do the bypass.
The brake lights I don't believe are connected so maybe a separate issue. I would do the bypass since MPH says it fixed his exact same issue cause you're going to have to either to that or replace the hazard switch itself to get your turn signals working without having to mess with the hazard button anyway.
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From: South Western Ontario
I love people that just "know" what must be the issue and the fix based on a fix fixing a similar issue yet also fully admitting they can't read a schematic...
FYI, the flasher bypass harness/wiring does nothing that would change the working of the brake lights. I posted the DIY bypass fix and it never touches any wire for the brakes.
If you look at the schematic above, the left side of the hazard switch shows a contact with a white wire coming in and a brown wire going out - that is where the brake light power passes through the hazard switch and it's one wire which is used for both the left and right brake lights. Further to the right is a pink wire and a purple wire - the flasher bypass connects to these wires.
http://forums.corvetteforum.com/1569256474-post48.html
Hmm, so do the flasher bypass to fix your intermittent flasher problem and then come back and tell us how you eventually replaced the MFS to fix the left brake lights.
Peter
FYI, the flasher bypass harness/wiring does nothing that would change the working of the brake lights. I posted the DIY bypass fix and it never touches any wire for the brakes.
If you look at the schematic above, the left side of the hazard switch shows a contact with a white wire coming in and a brown wire going out - that is where the brake light power passes through the hazard switch and it's one wire which is used for both the left and right brake lights. Further to the right is a pink wire and a purple wire - the flasher bypass connects to these wires.
http://forums.corvetteforum.com/1569256474-post48.html
Hmm, so do the flasher bypass to fix your intermittent flasher problem and then come back and tell us how you eventually replaced the MFS to fix the left brake lights.
Peter
Last edited by lionelhutz; Mar 27, 2011 at 02:23 PM.
Thread Starter
Burning Brakes
Joined: Jun 2009
Posts: 787
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From: Santa Rosa California
Thanks for all of the responses fellas, so this is what I need? http://www.vettenuts.net/index.php?l...t_detail&p=188
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From: Dyer, IN
Tech Contributor
Joined: Jan 2007
Posts: 19,401
Likes: 1,143
From: Dyer, IN
Here is the deal. From the hazard switch, there are two outputs to the MFS. The brown wire, circuit 27, is for the brake lights, and rear hazards. This means, if the right rear brake lights work, and the left rear brake lights don’t, it cannot be a problem with the hazard switch. The brown wire also flashes both left and right rears, when the hazard switch is depressed. If the right rear flashes with the hazards on, but the left rear does not, the problem is not with the hazard switch.
The purple wire, circuit 16, is for the turn signal flashers. This means, if the right rear turn signal flashes, and the left rear turn signal does not, it cannot be a problem with the hazard switch.
The purple wire, circuit 16, is for the turn signal flashers. This means, if the right rear turn signal flashes, and the left rear turn signal does not, it cannot be a problem with the hazard switch.
Race Director
Joined: Apr 2007
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From: South Western Ontario
When you press the hazard switch the contacts inside connect the flasher to the wire that is normally used for the brakes (same contact on the left side in the schematic). So, both problems are the same issue with the MFS not passing the power from the brown wire to the left bake/turn lights (yellow wire). You posting the hazards also don't work on the left rear just helps confirm the issue.
Now, you also said the left signal works. Well, that uses the same wire back to the same bulb filaments as the brake lights would use. So, the signal working but the brake not working indicates the wiring is OK and the bulbs are OK.
You can test this by pulling the covers under the dash and unplugging the switch. Jumper the bown wire to the yellow on the car side connector and I bet the left brake lights will begin to work. I also bet the left will flash when you turn the hazards on.
Peter
Last edited by lionelhutz; Mar 27, 2011 at 09:49 PM.