GMC Envoy: No Low Beam Headlights
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Date: 2022-10-24
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Comments and reviews: 14
Samuel
Good advice Eric, never overlook the bulbs blowing simultaneously. On my 2001 GM Holden Commodore, the cruise control stopped working, it would make a clack noise when turning the key and it wouldn't respond to any inputs. Long story short, some testing and trawling through forum posts later, I found out that when the brake light circuit has a fault, the cruise control stops working. I checked my brake lights, the one on the spoiler was working, but the bulbs were dead. I put a test light on both the bulb sockets while I used a broomstick to depress the brake, and both had power. It was only then I took a closer look at the actual bulbs. Turns out both bulbs just blew at the same time. And to think I was nearly going to pull the trigger on a new cruise module.
To my credit, I was far less experienced back then several years ago, I never considered the possibility of both bulbs blowing at once.
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Good advice Eric, never overlook the bulbs blowing simultaneously. On my 2001 GM Holden Commodore, the cruise control stopped working, it would make a clack noise when turning the key and it wouldn't respond to any inputs. Long story short, some testing and trawling through forum posts later, I found out that when the brake light circuit has a fault, the cruise control stops working. I checked my brake lights, the one on the spoiler was working, but the bulbs were dead. I put a test light on both the bulb sockets while I used a broomstick to depress the brake, and both had power. It was only then I took a closer look at the actual bulbs. Turns out both bulbs just blew at the same time. And to think I was nearly going to pull the trigger on a new cruise module.
To my credit, I was far less experienced back then several years ago, I never considered the possibility of both bulbs blowing at once.
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machintelligence
Many years ago I had a friend who absolutely hated repairing his car. One low beam burned out so he just ran with the highs on all of the time. Then the high beam burned out on the other side. I helped him replace the bulbs, which wasn't all that difficult. He was pretty handy in most other respects, but anything electrical flummoxed him.
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Many years ago I had a friend who absolutely hated repairing his car. One low beam burned out so he just ran with the highs on all of the time. Then the high beam burned out on the other side. I helped him replace the bulbs, which wasn't all that difficult. He was pretty handy in most other respects, but anything electrical flummoxed him.
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Robinson's
Yep remember those failures. I remember the first one I ran into many years ago. Even if you knew or not you followed a testing process that is excellent and helped your viewers learn instead of just going hey lets swap this and see. As always a great learning resource for up and coming techs or even just the person in their own garage.
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Yep remember those failures. I remember the first one I ran into many years ago. Even if you knew or not you followed a testing process that is excellent and helped your viewers learn instead of just going hey lets swap this and see. As always a great learning resource for up and coming techs or even just the person in their own garage.
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Richard
I have had that happen before on an older car with the 4 lamp square bulbs, it had no headlights. The customer called and wanted me to install a new headlamp switch because it was not working. Lucky for me I checked the system first, well you got it, all four headlamps were burned out!
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I have had that happen before on an older car with the 4 lamp square bulbs, it had no headlights. The customer called and wanted me to install a new headlamp switch because it was not working. Lucky for me I checked the system first, well you got it, all four headlamps were burned out!
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COVRTDESIGN
This video definitely doesn't suck Eric. What a great way to show how to assess if the wiring is good throughout the system quickly and in a smart fashion. Pretty sure the customer is quite happy to only have to deal with a new relay.
I really enjoy these videos.
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This video definitely doesn't suck Eric. What a great way to show how to assess if the wiring is good throughout the system quickly and in a smart fashion. Pretty sure the customer is quite happy to only have to deal with a new relay.
I really enjoy these videos.
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Sandbag1300
Excellent video. The process to resolution was terrific. Gotta chase two of these electrical issues myself today - airbag and garage door opener on 17 year old Jeep Grand Cherokee. Did find a mouse nest in the engine yesterday when changing valve cover gaskets.
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Excellent video. The process to resolution was terrific. Gotta chase two of these electrical issues myself today - airbag and garage door opener on 17 year old Jeep Grand Cherokee. Did find a mouse nest in the engine yesterday when changing valve cover gaskets.
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Frank
Once again, nice video. Can never get tired of watching you logically approach an issue and solve the problem. No matter how mundane it may be for you, it's interesting for us, of course along with your witty comments and real-life advice. Keep'm coming.
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Once again, nice video. Can never get tired of watching you logically approach an issue and solve the problem. No matter how mundane it may be for you, it's interesting for us, of course along with your witty comments and real-life advice. Keep'm coming.
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Graham
Classic fault finding protocol. This is where many shops fail, by using common knowledge', rather than a fact based logical method. Nice touch to shine up his lamp covers. Thanks so much for the link, this is VERY useful
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Classic fault finding protocol. This is where many shops fail, by using common knowledge', rather than a fact based logical method. Nice touch to shine up his lamp covers. Thanks so much for the link, this is VERY useful
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DIY
That 3M headlight restoration kit is the real deal. I've used them on my wife's car and my daughter's car and they both turned out fantastic, even when done by a DIYer like me. Thanks as always, Eric!
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That 3M headlight restoration kit is the real deal. I've used them on my wife's car and my daughter's car and they both turned out fantastic, even when done by a DIYer like me. Thanks as always, Eric!
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Allister
Your teaching technique is excellent. Describing all your actions and the reason for them. Lecturers could learn from you. Yes a simple diagnosis but the explanation of the process was excellent.
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Your teaching technique is excellent. Describing all your actions and the reason for them. Lecturers could learn from you. Yes a simple diagnosis but the explanation of the process was excellent.
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John
This video follows logic so clearly that it could easily be used at any tech school 101. It's clarity helps us understand how to dig a little further had there been the need to. Thank you!
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This video follows logic so clearly that it could easily be used at any tech school 101. It's clarity helps us understand how to dig a little further had there been the need to. Thank you!
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Broken
There's a TSB on that failed solid-state relay. They all fail. It runs at 70% duty cycle for DTR. In 06 and older GMT360's there is a second one for the fan clutch also.
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There's a TSB on that failed solid-state relay. They all fail. It runs at 70% duty cycle for DTR. In 06 and older GMT360's there is a second one for the fan clutch also.
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Daniel
I had that happen on my 2009 Malibu and it turned out that the bulbs just needed to be replaced. Actually replacing them takes a bit of work, though.
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I had that happen on my 2009 Malibu and it turned out that the bulbs just needed to be replaced. Actually replacing them takes a bit of work, though.
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Satguy141
Your reaction when you plugged in the fan relay and the lights came on was surprise and a hint of disappointment at the same time, it was great.
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Your reaction when you plugged in the fan relay and the lights came on was surprise and a hint of disappointment at the same time, it was great.
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