This video quickly shows the location and what the unit looks like:
(Yukon is the same place as the Silverado)
2003 silverado truck flasher relay location
SOURCE: 1997 sonoma turn signal flasher
it is inside, under dash, on left side is a plastic sound protector, mine had 3 screws holding it up, drop this down and straight in you will see a 1" round thing - this is the flasher, pull it out and replace with new one (there are two flat prongs that plug in). It appears this is a well guarded secret!
SOURCE: 1997 sonoma turn signal flasher
The flashers are located behind the instrument panel trim, roughly between the base of the steering wheel and the ashtray, just to the left of the car lighter. To access the flashers, you need to at least loosen the lower instrument panel trim. Just under the steering column there are two screws with star heads. One to the left of the column and one to the right. You need to remove both of these screws. You will need to remove your ashtray. On the upper left corner of the hole left by removing the ashtray is a 9/32 hex head screw. You need to remove it. Once these three screws are removed you should be able to pull down on this portion of trim under your instrument cluster. When you do this it may cause trim around your instrument cluster to loosen that you can just pop back into place with your hand. You won't need to pull down to far on this trim piece as there are still some screws holding the bottom. You should be able to pull it down far enough to see the flasher units behind and just to the left of the cigarette lighter. There are two flasher units and I found that the one on the right is for the turn signals.On the left the other is for the hazard flashers. It may be a hand scraping experience to replace the flasher but it beats paying someone to do it for you. They are easy to recognize because the are silver and round metallic plug ins. The flasher unit on the left is for the emergency flashers and the one on the right is for turn signals. You can place the emergency flasher unit into the slot the turn signal unit belongs until you get a replacement. These flasher units are pretty cheap.
SOURCE: 2004 GMC Yukon xl......If I put left turn signal
That vehicle has all three switches attached to the same module. Spray a little wd-40 into the flasher switch. Sometimes the slide on the flasher switch gets a little sticky and won't allow the turn signal to work independently. If that isn't the case, there is a repair kit for that available on ebay. the module of course costs around three hundred to replace but could possibly be found at a boneyard for much less. Also, check ebay for that module. Hopefully the WD-40 will fix it. Good luck.
SOURCE: GMC 2003 Yukon XL left turn signal works
Hi, I think your flasher has separate relays for right and left. It is not a normal flasher (has 10 pins), but it is plugged into the fuse panel under the left side dash. Try replacing that, or if you have a voltmeter you could check the flasher socket for a proper signal from the switch. There should be power on pin C of the socket when the left signal is clicked on (key on). It has to be the switch or the flasher as I have looked at everything downstream from there. Please let me know if you have questions, and thanks for using FixYa.
SOURCE: replace turn signal flasher 1999 yukon
There is not such flasher module available, this uses an electronic flasher. The old ones where a mechanical heated metal design and louder ones where made.
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