- Dec 24, 2018
- Reaction score
Has anybody here tried the plug and play harness for the fog light installation from Gen5diy?
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Guys, great thread. I've got a '17 LT and am amassing parts and research info to do this installation. Couple of questions:
- Does anyone know precisely where the factory front fog lamp relay (KR46 in the schematics) is located in the underhood fuse block (schematics all say it's in there)? Could it be one of the upfit relays that's dedicated to the T3U option? Yeah, I looked in my Owner's manual, chatted online with GM, and called 4 Chevy, GMC and Cadillac dealers. The location of this relay must be some huge state secret - even looking at OMs from '15 on, there's no mention of it and no one I've talked to can answer the question.Also, here's why LSs and LTs without Premium packages aren't capable of having fog lights... There is a separate bumper harness - part #23181386 - that feeds the collision sensors and cameras on the front bumper, and as it turns out, the fog lights. It's fed through the X100 connector up front on the passenger side. If you wanted to stay as close to factory as possible/practical, it wouldn't necessarily mean rewiring the entire engine compartment; it would require that harness (street price ~$70) and getting juice to it from the fuse block. Can't believe they put the fog light terminals/wiring on that harness when the front light harness could have carried them. Thanks, GM...
- When bypassing the BCM, using the 611T and BYO relay, do the fog lights remain on when high beams are on? Pretty sure that would fail inspection in VA (and probably other states). If they do stay on, is there a way to provide a trigger when EITHER the parking lights or low beams are on but goes off when high beams come on or are flashed?
- Looking at the top of the X50A underhood fuse block, it appears the fog lamps fuse (94) is pinned on my '17. Assuming there's connectivity from the (ghost) relay to the fuse pins, did anyone consider using a fuse tap to start the 12+ circuit to the lamps? I'm thinking if I can find the factory front fog lamp relay, adding a fuse tap to the F94UA fuse location might solve being able to use the BCM, once programmed by the dealer (who's willing to do that, BTW).
Many thanks to all who've contributed here - Especially nilleo for the incredible detail and effort that went into his initial and subsequent posts.
I used pin 1 on X4 connector for the switch on the fog lightsand I get a buzzing in the BCM in daytime but not on nighttime or if the headlights switch is on and not auto. My low beams act as DRL so they either don't get full 12 V or there is a issue with the fact that I installed LED bulbs and I no longer have halogen bulbs. Any thoughts?It's definitely the same switch assembly in the body builder's schematic for both front and rear fog lamps at least for our US models ¯\_(ツ)_/¯.
For a low beams signal inside the truck--If you have halogens, yellow at the BCM, plug X4, pins 1 and 2 go out to the low beams (12V when on). If you have HID, it's still yellow at the BCM, but in connector X1, pins A2 and C2.
For switched ignition or accessory--there are tons of sources all over, I'd say check out the body builder's manual to see which one would be more convenient to you.
I used pin 1 on X4 connector for the switch on the fog lightsand I get a buzzing in the BCM in daytime but not on nighttime or if the headlights switch is on and not auto. My low beams act as DRL so they either don't get full 12 V or there is a issue with the fact that I installed LED bulbs and I no longer have halogen bulbs. Any thoughts?