Lost both low beams
#1
Lost both low beams
This is what I have so far:
1. Replaced both bulbs
2. Checked HDLP relay , clicks when you turn on lights
3. Checked voltage at HDLP fuses, both at 12volts when relay is engaged , continuity’s are good
This seems to indicate that there is a failure between the fuse and the bulb, or a failure between the bulb and the ground. Both circuits are independent ,and have no active components down stream of the fuses. I lost one low beam, then shortly lost the other, so in a rush, I replaced the bulbs, and did not trouble shoot at the low beams, big mistake, it’s not easy to change the bulb, you have to pull the head lights. I saw the high beams , mistook them for the low beams. With all that said , I still need to pull the lights and determine if the failure is the power or ground. It Just amazes me that two independent circuits would go out together in a short period of time.
Another interesting fact is that when you turn on the high beams, you don’t lose power at the low beam fuses, I thought BCM was supposed to cut the low beams off, when the highs were turned on?
I have a 2008 suburban
Any help is appreciated thanks
1. Replaced both bulbs
2. Checked HDLP relay , clicks when you turn on lights
3. Checked voltage at HDLP fuses, both at 12volts when relay is engaged , continuity’s are good
This seems to indicate that there is a failure between the fuse and the bulb, or a failure between the bulb and the ground. Both circuits are independent ,and have no active components down stream of the fuses. I lost one low beam, then shortly lost the other, so in a rush, I replaced the bulbs, and did not trouble shoot at the low beams, big mistake, it’s not easy to change the bulb, you have to pull the head lights. I saw the high beams , mistook them for the low beams. With all that said , I still need to pull the lights and determine if the failure is the power or ground. It Just amazes me that two independent circuits would go out together in a short period of time.
Another interesting fact is that when you turn on the high beams, you don’t lose power at the low beam fuses, I thought BCM was supposed to cut the low beams off, when the highs were turned on?
I have a 2008 suburban
Any help is appreciated thanks
#2
solved the problem, new spyder head lights low beam plug did not exactly line up with the original light harness, and the plug prongs were bent in both fixtures. I spread the prongs a little and carefully inserted them, all is good.