Headights Down - Lights On - New HCM?
Thread Starter
Heel & Toe
Joined: Jan 2007
Posts: 17
Likes: 0
From: Odessa Florida
Headights Down - Lights On - New HCM?
The headlights on my 2000 C5 will not come up but the lights operate. I have check the resistance of the C1 D terminal (black wire) and it was with in the 0-2 ohm tolerance. I also check the C1 terminal A (white wire) and it had voltage when the headlight switch was turned on. I assume this eliminates the headlight switch itself as the problem.
DTCs from 40-BCM are
B0502 H C
B0507 H C
B2482 H C
Are there any other diagnostic checks that I should do or is it time to start throwing new parts, like a new Headlight Control Module, at the problem?
DTCs from 40-BCM are
B0502 H C
B0507 H C
B2482 H C
Are there any other diagnostic checks that I should do or is it time to start throwing new parts, like a new Headlight Control Module, at the problem?
Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,171
From: Dyer, IN
The headlights on my 2000 C5 will not come up but the lights operate. I have check the resistance of the C1 D terminal (black wire) and it was with in the 0-2 ohm tolerance. I also check the C1 terminal A (white wire) and it had voltage when the headlight switch was turned on. I assume this eliminates the headlight switch itself as the problem.
DTCs from 40-BCM are
B0502 H C
B0507 H C
B2482 H C
Are there any other diagnostic checks that I should do or is it time to start throwing new parts, like a new Headlight Control Module, at the problem?
DTCs from 40-BCM are
B0502 H C
B0507 H C
B2482 H C
Are there any other diagnostic checks that I should do or is it time to start throwing new parts, like a new Headlight Control Module, at the problem?
Thread Starter
Heel & Toe
Joined: Jan 2007
Posts: 17
Likes: 0
From: Odessa Florida
Both orange are hot all the time. Pin A does go to 0v in off position. Not sure about pin C. I believe C did not have voltage with switch in "off". Wouldn't that prevent them from going down? Would it have any impact on opening? I will check pin C this evening and post results.
Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,171
From: Dyer, IN
Both orange are hot all the time. Pin A does go to 0v in off position. Not sure about pin C. I believe C did not have voltage with switch in "off". Wouldn't that prevent them from going down? Would it have any impact on opening? I will check pin C this evening and post results.
Thread Starter
Heel & Toe
Joined: Jan 2007
Posts: 17
Likes: 0
From: Odessa Florida
LUCKY131969,
There was no voltage on the green wire until I replaced the fuse you suggested. It was blown and now the headlights are working correctly. Any idea what might have caused the fuse to blow?
New issue with the RH drive. When it closes there is a grinding noise for about 15 seconds then stops. Any suggestions?
Finally, there is on other electrical issue regarding the driving lights and the LH turn signal. I will start a new thread for it but your help would be greatly appreciated.
I feel like a real idiot for not having found that fuse! In any event, your help on this problem is greatly appreciated. Folks like you make this forum one of the most valuable resources I have found on the internet. Once again a sincere "THANK YOU"!
There was no voltage on the green wire until I replaced the fuse you suggested. It was blown and now the headlights are working correctly. Any idea what might have caused the fuse to blow?
New issue with the RH drive. When it closes there is a grinding noise for about 15 seconds then stops. Any suggestions?
Finally, there is on other electrical issue regarding the driving lights and the LH turn signal. I will start a new thread for it but your help would be greatly appreciated.
I feel like a real idiot for not having found that fuse! In any event, your help on this problem is greatly appreciated. Folks like you make this forum one of the most valuable resources I have found on the internet. Once again a sincere "THANK YOU"!
Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,171
From: Dyer, IN
http://forums.corvetteforum.com/c5-t...iy-thread.html
No problem. Glad you posted up....before changing the control module.
