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Old Apr 2, 2008 | 12:24 PM
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Default Headlight Operation

When you guys (and/or gals), turn on your headlights, do you have to turn the switch more than once to get them to come up? This is usually the case with mine, but every once in a while, they pop up on the first attempt. I looked at the manual, and found nothing that suggested I should have to double click my headlight switch.
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Old Apr 2, 2008 | 12:35 PM
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No, they should come up the first time you turn them on. You either need to replace your headlight gears with brass gears or replace the switch.
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Old Apr 2, 2008 | 12:48 PM
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When the plastic gears fail, how do they fail? Do they bind, strip, or just break off? I would be surprised if it was a gear problem due to the fact the car has less than 20K miles on it, unless it is some sort of failure based on the age of the material and not the wear. My feeling is these gears fail because of fatigue, not necessarily age.

I would lean toward a switch problem, but the first stage is fine (fog lights). It doesn't seem to be a contact issue, because I can't make them come up by wiggling or twisting harder on the switch. Also, if I do have to try a second time to make them come up, I can not just go back to the first stage of the switch, then to the second. I have to go all the way to the off position and straight to the second stage, (or headlight up position of the switch), to make them pop up. It's odd.
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Old Apr 2, 2008 | 12:53 PM
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They will get stripped and its a common problem with the C5's. They are nylon gears so they break down pretty easily.
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Old Apr 2, 2008 | 01:45 PM
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Originally Posted by Black_6-Speed
When the plastic gears fail, how do they fail? Do they bind, strip, or just break off? I would be surprised if it was a gear problem due to the fact the car has less than 20K miles on it, unless it is some sort of failure based on the age of the material and not the wear. My feeling is these gears fail because of fatigue, not necessarily age.

I would lean toward a switch problem, but the first stage is fine (fog lights). It doesn't seem to be a contact issue, because I can't make them come up by wiggling or twisting harder on the switch. Also, if I do have to try a second time to make them come up, I can not just go back to the first stage of the switch, then to the second. I have to go all the way to the off position and straight to the second stage, (or headlight up position of the switch), to make them pop up. It's odd.
the contact points of the switch are not at the end where they would be affected by wiggling. the switch it has to be removed to clean or to
put more pressure on them.
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Old Apr 2, 2008 | 02:33 PM
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I have the same issue with mine. But I have HID bulbs, so I know what causes this problem. It's not enough voltage recognized by the BCM, it thinks a bulb is out.
Can you turn the lights on on the first try if you have just the high beams on? Try that and let us know if it works. If it does, then I would look at replacing the low beam bulbs. You may have one that is not pulling enough voltage and tricking your BCM into thinking there is a bulb out.
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Old Apr 2, 2008 | 02:55 PM
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Originally Posted by sneakelman
I have the same issue with mine. But I have HID bulbs, so I know what causes this problem. It's not enough voltage recognized by the BCM, it thinks a bulb is out.
Can you turn the lights on on the first try if you have just the high beams on? Try that and let us know if it works. If it does, then I would look at replacing the low beam bulbs. You may have one that is not pulling enough voltage and tricking your BCM into thinking there is a bulb out.
I tried that, but it didn't work. It's an interesting theory though. Could it be that one of the bight bulbs isn't pulling enough voltage too. It doesn't act any different with brights as it does with low beams. These bulbs could be original. I bought the car last year with 9K miles so they wouldn't have been used a whole lot, but would be 11 years old, if original.
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Old Apr 2, 2008 | 03:42 PM
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Originally Posted by Black_6-Speed
I tried that, but it didn't work. It's an interesting theory though. Could it be that one of the bight bulbs isn't pulling enough voltage too. It doesn't act any different with brights as it does with low beams. These bulbs could be original. I bought the car last year with 9K miles so they wouldn't have been used a whole lot, but would be 11 years old, if original.
Are you 100% positive that you DON'T have HID's? I've never heard of this issue with a non-HID setup.

Here's a picture of a bad gear:

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Old Apr 2, 2008 | 06:39 PM
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Being that it is both headlights. I kinda rule out stripped gears. Not that it couldn't be, just that you would hear a crapload of noise if it were.
I'm with junkman on this one, are you sure you don't have HIDs? But then, you would have to have low and high HIDs for the problem to occur. When you hit the lights, do they come on bright, go dim, then brighten back up? If they do, then they are HIDs. If not, maybe the control module for the headlights is failing.
Good luck, and let us know what you find.
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Old Apr 3, 2008 | 12:47 PM
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I don't think they are HID. They aren't extremely intense like the cars I've seen with the HID. I may be mistaken though. Is HID the same as xenon headlights? They are definitely not the crazy blue intense lights that you see on newer cars. Also, I would be surprised if the original owner would have made any changes to the car. He was in his 60s and put only 9K miles on it in the 10 years he owned it.

Thanks for the interest in helping me figure this out. Sorry it took me so long to get back to the thread.
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