2016 Suburban LT Fog Lamps install with OEM switch

[Usdmskyline20]

Can anyone confirm what bulb pattern comes with the Spyder fog light kit ?

I finally had my fogs installed yesterday by a friend of mine who has a local stereo shop. Looking to put HIDs or LEDS in from Vanquish but need the pattern. Any info is appreciated.


2011 Dodge Ram 1500 Big Horn
2017 Chevy Tahoe LT
Sent from my iPhone using Tapatalk

 

[Z71Jack]

Can anyone confirm what bulb pattern comes with the Spyder fog light kit ?

I finally had my fogs installed yesterday by a friend of mine who has a local stereo shop. Looking to put HIDs or LEDS in from Vanquish but need the pattern. Any info is appreciated.


2011 Dodge Ram 1500 Big Horn
2017 Chevy Tahoe LT
Sent from my iPhone using Tapatalk

I'm wondering the exact same thing...what do you think of the kit so far?

 

[Hutch08]

vanquish HID low beam, LED high beam and LED fog light kit.

Used there supplied Spyder light housings and wired to turn on whenever low beams are on.

Sorry no pics of fogs on by themselves. They do a decent job of lighting up the ditches.

 

[bezimmer]

Thanks, I downloaded the schematics and looked them over, here are some notes, be advised, all this refers to a 2016 vehicle/schematic:

Front Fog Lamps (RPO T3U) and Rear Fog Lamps (RPO T79)
most info is shown on page 41, it is comprised of three circuits:
Circuit 192 - from Headlamp switch to BCM
Circuit 1317 - is from the BCM to control Fog Relay KR46
Circuit 2234 - +12v output to Fog Light bulbs.


RPO Description
T3U LAMP FRT FOG-FRT FOG
T79 LAMP-FOG, RR (T79 is the ReaR fog lamps, which are only European? canadian?)

here are the page numbers to find the connector picture/description/schematic:

X50A Fuse Block - Underhood X1 page 430
Pin Size Color Circuit Function Terminal Type ID Option
J3 0.5 BN/VT 2234 Front Fog Lamp Supply Voltage III T3U

X50A Fuse Block - Underhood X3 page 434
Pin Size Color Circuit Function Terminal Type ID Option
L5 0.5 BN/WH 1317 Fog Lamp Relay Control I T3U

K9 Body Control Module X1 page 727
Pin Size Color Circuit Function Terminal Type ID Option
4 0.5 RD/BN 2240 Battery Positive Voltage
15 0.35 D-BU/GY 192 Front Fog Lamp Switch Signal T3U
22 0.35 L-GN/GY 13 Headlamp Switch Park Lamp Signal

K9 Body Control Module X5 page 735
Pin Size Color Circuit Function Terminal Type ID Option
10 0.5 BN/WH BN 1317 Fog Lamp Relay Control T3U

S30 Headlamp Switch page 1001
Pin Size Color Circuit Function Terminal Type ID Option
10 0.35 D-BU/GY 192 Front Fog Lamp Switch Signal I T3U

X100 Forward Lamp Harness to Front Bumper Harness (X88 or Z88) page 1122
Pin Size Color Circuit Function Terminal Type ID Option
3 0.5 BN/VT 2234 Front Fog Lamp Supply T3U

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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.

- 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).
​

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...

​

Many thanks to all who've contributed here - Especially nilleo for the incredible detail and effort that went into his initial and subsequent posts.

 

[Ruikee]

- 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?

​

I live in VA, and an option would be to disconnect the fogs b4 inspection, and if asked, just for show. Did this with HIDs that wouldnt pass. Not optimum, but an option....​

 

[bezimmer]

I live in VA, and an option would be to disconnect the fogs b4 inspection, and if asked, just for show. Did this with HIDs that wouldnt pass. Not optimum, but an option....​

Thanks, Ruikee. Thought about that but there are two potential issues. As you may know in VA if you have lights - of whatever type - on a vehicle, they must work. So disabling them might also fail. Second is, with the OEM switch bypassing the BCM, I don't believe there's an idiot light for "fog lamps on." So, if you forget they're on and a cop sees you with high beams and fogs, you're likely to get pulled over (at least most communities around where I live).

As an aside, I checked a "Premium" model Suburban with factory fog lights at the dealer today, thinking the relay would be stuck in one of the "upfit" option slots. Its underhood fuse block was identical, absolutely identical to mine. So if there's a foglight relay it's either somewhere else or handled by some solid state device(??) that I've never heard of. Very frustrating that no one can answer where this relay is.

Anyway, thanks for the reply. BZ

 

[Usdmskyline20]

I'm wondering the exact same thing...what do you think of the kit so far?

Sorry for the late reply. Vanquish HID kit is amazing. I like the fogs. I have the vanquish led kit just no time to install it yet. No idea what the exact bulb pattern is.


2011 Dodge Ram 1500 Big Horn
2017 Chevy Tahoe LT
Sent from my iPhone using Tapatalk

 

[bezimmer]

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.

- 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).
​

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...

​

Many thanks to all who've contributed here - Especially nilleo for the incredible detail and effort that went into his initial and subsequent posts.

So here's an update. I haven't done my install yet, but I will take pictures and post. This solution seems incredibly easy compared to previous ones because it doesn't involve the 611T MOSFET latching relay. A little background (some of this will be repeats of previous posts - purpose is to outline the new procedure stuff in one place):

• Install OEM switch as was previously described.
• When the momentary fog light switch is pressed, the OEM switch fires a ground signal to the Body Control Module (BCM) which in turn sends ground to the relay to turn on the fog lights. We need to tap that circuit (1317 in the schematics) to grab the ground pulse. The most easily accessible place to grab this connection is found by opening up your fuse block and finding connector X3. In position L5, you will find and follow the brown wire to a bundle outside the fuse block. This will serve as the source for firing a BYO (bring your own) relay.
• Splice a tap in this brown wire and connect it to pin 86 on a general purpose BYO relay (at least 20A rating).
• Find a 12V+ power supply and add an inline 15A fuse.
• Connect fused power to pins 30 and 85 on the relay.
• Assuming your lights are already in place and wire has been run to the fuse block area, connect lights to pin 87 on the relay.
• Have your dealer reprogram your BCM for "Equipped with fog lights (Option T3U)". Mine was more than happy to work with me on this.
• You're done. I believe this will also activate the idiot light on the DIC. And it will behave legally for places where highs and fogs cannot be on at the same time.

There is another option that I'm toying around with. Since my fuse block was identical to the Premium model on my dealer's lot, I'm assuming that it already has relay KR46 (fog lamps relay in circuit 2234). As nilleo pointed out, the fog lamps fuse is already installed in position 94 even on vehicles without them, so I think it's safe to assume the relay is there too (somewhere - I still don't have an answer where it's physically located - one guy I talked to thought it might be soldered to the X50A Underhood Fuse Block somewhere. Dunno).

Anyway, in his first post, nilleo points out that fuse 94 (position J3 in connector X1) isn't pinned - but that's not the whole story. The fuse block appears to be set up for fog lights, just not the X1 connector below. That's because a terminated lead is missing that would run the 12V+ power to the fog lights from the X1 connector. My dealer is looking for that part. It's not a catalog part - kept in what they call their Electric Service Trays - think trays of miscellaneous consumables that mechanics don't need to go to the parts desk for. The part number for the terminated lead is 19301752 and I believe if my dealer can locate that terminated lead, I'll pop it into X1/J3, wire that to the fog lights, and I won't even have to mess with a BYO relay! Almost all factory!

Anyway this is all theory until I get it wired up this week, hopefully, if I can find the time. I love the second option because everything can be OEM except for the wiring from the fuse block to the lamps. Love it. I'll upload some excerpts from the schematics.

 

[bezimmer]

Here's the wiring diagram for the BYO relay option.

 

[bezimmer]

Here's the OEM wiring diagram (confirmed it's the same for 2015-2018):