Headlights Low Beam Strange Problem
Team Owner
Joined: Mar 2008
Posts: 21,502
Likes: 461
From: Southern Utah
This type of fuse box is not confined to the Corvette...it is used in every GM car, so it can't be all that bad. This means that there are literally millions of these out there functioning every day. That one connection for the low beams is a weak point, easily fixed. Replacing the entire box seems like asking for trouble to me. There are a number of different ways of making that one connection more robust.
Replace the wire.
Solder it.
Add another wire so that both have to fail to disrupt the lights.
Replace the wire.
Solder it.
Add another wire so that both have to fail to disrupt the lights.
Instructor
Joined: Sep 2007
Posts: 233
Likes: 0
My friend has a 2005 with 89xxx on the clock. She is having the same issue. The fuse box gets really warm then the lowbeam headlights go out. I noticed when this happens if I apply a bit of pressure on the headlight relay the lights illuminate. Remove my hand and off they go. Checked for the broken wire and really didn't see much of crack. Replaced it anyway. Same problem!
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Inside the FUSE BOX, are solid copper wiring traces. The one for the head light can and will burn in half. You can disassemble the fuse box and repair /replace the trace yourself and save a ton of cash.
Give it a try.
Bill
Give it a try.
Bill
Instructor
Joined: Sep 2007
Posts: 233
Likes: 0
Yes I did take it apart and replaced the copper trace. To no avail, problem still persist. ?
Cruising
Joined: Apr 2014
Posts: 12
Likes: 0
i just had this problem last night...it was about 90 degrees or more outside...roughly how much is this to have the dealership fix out of warranty?
btw its a 2007 c6
thank you in advanced!
btw its a 2007 c6
thank you in advanced!
Last edited by NETRIDER; Jul 14, 2014 at 05:16 PM.
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1st Gear
Joined: Dec 2014
Posts: 1
Likes: 0
headlights
You can start with the normal headlight low beam function via the headlight switch.
The BCM has an internal pull up for it's digital inputs.
So with that pin high from the internal pull up it = OFF
Pulled low from a switch or relay to ground= ON
So if the headlight switch is turned on, PIn 15 on the BCM should be pulled low via the headlight switch to ground 201. If the parking lamps turn on then that ground is good, if neither the parking lamps and the headlights do not turn on, then you could take a jumper wire form pin K on the headlight switch to ground. If they turn on then you need to trace that ground connection. If they do not turn on and pin 15 on the BCM is low, then check pin C2-3 on the BCM for a low signal. This is what toggles the ground for the low beam relay. If you have any questions on this just let me know.
DJ
The BCM has an internal pull up for it's digital inputs.
So with that pin high from the internal pull up it = OFF
Pulled low from a switch or relay to ground= ON
So if the headlight switch is turned on, PIn 15 on the BCM should be pulled low via the headlight switch to ground 201. If the parking lamps turn on then that ground is good, if neither the parking lamps and the headlights do not turn on, then you could take a jumper wire form pin K on the headlight switch to ground. If they turn on then you need to trace that ground connection. If they do not turn on and pin 15 on the BCM is low, then check pin C2-3 on the BCM for a low signal. This is what toggles the ground for the low beam relay. If you have any questions on this just let me know.
DJ
