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Adding fog light option

Tiny
BEASTFROMTHEEAST
  • MEMBER
  • 2003 CHEVROLET S-10
Computer problem 6 cyl Four Wheel Drive Automatic 50,000 miles

I was wonderingif anyone really knows how to program a BCM for an add on RPO-ANL foglights

Lots of people say how easy iti s but I am yet to find anyone who can outline how to do it.

I have installed a switch in the dash for the foglight option, have a ground reference at the proper BCM terminal. I have tested the circuit fromthe BCM which when power is applied enegizes the foglight relay, lights the indicator light on the foglight switch and send power to the foglight electrical connector in the grill.

I have twice installed a new BCM as they lock after VTD learn and are useless from a programming aspect. With no favorable results. Considering the BCM 2002-2004 are all the same for the s-10 and the foglight option was available the circuitry is in the BCM to power the relay.

I was hoping someone would know exactly how this can be done as I am beside myself wondering how something so simple has been made next to impossible by GM.

Thanks-Bruce

I willpay for the right answer but only for a detailed procedure that a GM tech with a tech II can follow and get these lights working
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Thursday, August 27th, 2009 AT 4:10 PM

19 Replies

Tiny
RACEFAN966
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I don't find that there is any reprogramming needed. It seems to be all in the wiring of it. If you want I can print and try to include the wiring for the lighting. Here is what I find. First there is the fog light fuse it is a 15 amp, go to the fog lamp relay. Term A7 (dk green wire with white stripe) from the BCM go to the fog light relay. Now from the relay you go to the park lamp relay and to the fog light switch. From the relay power output to the fog lights. Now the switch then goes to gound and the fog light switch in on the BCM to term B5 orange wire. Like I said I can try to print and scan the wireing diagram if you like and include it for you but I don't know how well it will show up for you. Let me know if you want me to try anyway. I would use the factory style foglight relay too.
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Friday, August 28th, 2009 AT 10:19 AM
Tiny
BEASTFROMTHEEAST
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I know how the thing works, and have checked all the wires and switches and relays and fuses, it all works. The BCM does not know what do do with the ground reference from the switch. And yes programming is required for accesory operation in a GM BCM otherwise nothing works. MY question was how do you program the BCM, what steps and in what order! For 20.00 I get check your fuse, great
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Friday, August 28th, 2009 AT 4:56 PM
Tiny
RACEFAN966
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Ok here is what I finally was able to find on Mitchel 1. I didn't tell you check you fuse either I also gave you a full discription of the wire and pulled a wiring diagram. I don't know how far you with the install. Now you need a techline terminal and a scan tool to program the BCM. You simply plug them in and follow the promps.
Here is something else I found.
Remove key, rmove BCM fuse and then close all doors. Now insert key and turn on fog lights, then turn key off and back to accessory after you hear chimes. You should hear another short chime telling you now that it is done.
I am not confident of the second procedure but I know the first one is 100% correct.
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Saturday, August 29th, 2009 AT 9:17 AM
Tiny
BEASTFROMTHEEAST
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It sounds resonable, the problem is I have had 4 experts tell me 4 different ways to do it. Ihave also spent 600 dollars on 2 BCM's and been to 2 different GM dealers for programming. The problem is 1000.00 later my foglights don't work. Follow the prompts does not help because I am not there when it is being done. I was hoping for someone to say something like got to special functions, pick RPO code ANL and bla, bla, bla. I should have bought a tech 2 and done it myself I am sure I could figure it out given some time. I just find it hard to believe there are no technicians anywhere that have done this or know how to do it. I think it boiles down to GM does not care unless I am buying a new car and when I do it will be a toyota. Thanks-Bruce

PS I have all the wiring diagrams and have gone through all the hardware
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Saturday, August 29th, 2009 AT 11:15 AM
Tiny
RACEFAN966
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Ok I understand better now. Yes that would be very frustrating to spend that and still not work. Now did the procedure I send work at all? If not let me know I will look to see if I find another procedure to try.
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Monday, August 31st, 2009 AT 10:57 AM
Tiny
BEASTFROMTHEEAST
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Nothat did not work, but I was unsure exactly ehat youmeant you said put the key in, then turn the key off I missed the part about thurning it on and was not sure if on meant run on or acc on. Also if the BCM fuse is unplugged I don't think there will be any chime as it is contained inside the BMC killing the power to the BCM should kill the chime as well. I will however try anything at this point. Thanks-Bruce
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Monday, August 31st, 2009 AT 2:44 PM
Tiny
RACEFAN966
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So tell me have you thought about just using a relay and wiring it from your switch to a relay and then to the lights? Therefore not using the BCM for the ground? Wiring it like such.


https://www.2carpros.com/forum/automotive_pictures/249564_relaydiagram_small_1.gif

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Tuesday, September 1st, 2009 AT 10:06 AM
Tiny
BEASTFROMTHEEAST
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I could doit as I have drawn it out here as well and use the existing foglight switch(ground reference) however they would be on until the lights went out or the truck was shut off. In order to shut them off I would need the momentary push button drawn in here. The problem is drilling holes in the dash and cutting wires at the BCM to do this. Then there is no going back. I guess I just am to thick to understand why with thousands of these trucks running around with the foglight option working from the factory with then same part number BCM as mine why nobody on the planet knows how to program it. They had to program it on the factory option when they came stock. I find it hard to believe that if a factory equiped truck with foglights cooks a BCM the dealer says " by the way you foglights will not work any more cause we can't program them" I mean you must admit I have a point there, right? Thanks-Bruce
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Tuesday, September 1st, 2009 AT 4:58 PM
Tiny
RACEFAN966
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It can be programmed but you need a tech line and a scan tool to program it according to Mitchelle 1. Now there is a chance that with 03 being one of those years that they still used the non programable BCM that you have one. But the right dealer with an SPS system can reprogram it to see the fog lights but they need to have the sps system and follow the prompts to do this. This comes from a friend that works for GM and has for many years.
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Wednesday, September 2nd, 2009 AT 9:59 AM
Tiny
BEASTFROMTHEEAST
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OK, I guess that is the whole problem I can't find anyone that knows what they are doing. My BCM is one of the last that can not be reprogramed, this is why I bought new ones for the programming. It was done at GM dealer but the foglight option was never activated. I asked them to call the techline but I guess they didn't. I think the real problem is nobody but me cares if the foglights work in stock configuration. I am trying to get a tech 2 now. If I can get one I will go to dealer and have him download the SPS into the tech 2 and do the job myself as I can follow simple computor instruction. The problemis the cost, used 1500-2500. Does your friend know for a fact it can be done as in he has done it? As many have said it can be done but nobody can outline the procedure for me?-Bruce
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Wednesday, September 2nd, 2009 AT 2:59 PM
Tiny
RACEFAN966
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Ok my friend told me that you are right you just not finding the right guy that knows what to do. He should be willing to look it up if he isn't sure how it is done. With the tech line and a scanner it should be able to be turned on. He said you may have to turn on options you don't have but no worries about that. Hope you have better luck.
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Tuesday, September 8th, 2009 AT 10:03 AM
Tiny
BEASTFROMTHEEAST
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Thanks for your help-Bruce
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Tuesday, September 8th, 2009 AT 3:18 PM
Tiny
RACEFAN966
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Let me know how it goes ok. I would like to know you got it going.
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Wednesday, September 9th, 2009 AT 10:00 AM
Tiny
BEASTFROMTHEEAST
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I don't trust that I can find anyoneto do it for me, remember every time it cost money for a new BCM.
I have drawn up a set of 4 relays that should work off the ground reference and allow me to turn on or off with a pulse from the orignal switch. Having it hooked to the ashtray light will supply 12 volts only when lights are active. A pulse from the switch and output tothe foglight relay should makeit go.I ordered some small relays and a small enclosure to build it all with. That my next move-Bruce
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Wednesday, September 9th, 2009 AT 3:26 PM
Tiny
RACEFAN966
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Hey didn't think of doing it that way. That will make it work just as you want. Don't blame you on the lack of trust.
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Thursday, September 10th, 2009 AT 10:25 AM
Tiny
BEASTFROMTHEEAST
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I willlet you know how it works out-Bruce
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Thursday, September 10th, 2009 AT 2:42 PM
Tiny
RACEFAN966
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Yes please do.
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Friday, September 11th, 2009 AT 10:21 AM
Tiny
DIGGER DEGROFF
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Your best bet (experience with the same issue) is to contact ACDelco Techline and asking them to re calibrate your vehicle to include the ANL code. They will do a Vehicle Calibration Index for your truck. Then take that VCI to your local dealer and tell them you need bcm programmed with VCI.
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Thursday, November 2nd, 2017 AT 6:43 PM
Tiny
KEN L
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Great addition to this thread! Please feel free to help out whenever you are on the site :)

Cheers, Ken
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Friday, November 3rd, 2017 AT 3:53 PM

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