Adding fog lamps may require "reprogrammed BCM"? - Chevy Impala Forums
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post #1 of (permalink) Old 09-12-2016, 02:25 PM Thread Starter
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Adding fog lamps may require "reprogrammed BCM"?

So I've been wanting to add fog lamps on my car since I bought it. Now that I have the new bumper (soon), lamps, bezels, and harness, I called up my local Chevy dealer to have them wire it up and they said the BCM may need to be reprogrammed?? I thought that was only if you were wanting to run the factory button? Sounds really expensive and wanted to know if that is true, and I'll end up returning it all..

2015 Impala Limited, currently no fog lamps nor interior button.

2015 Chevrolet Impala Limited "SS"
3.6L V6 - 316HP/282FT-LB

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post #2 of (permalink) Old 09-12-2016, 05:21 PM
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BCM would only need reprogramming if you wanted the factory button. If you wired a separate switch you wouldn't need anything programmed. You could wire to the parking light fuse and skip the switch if you don't mind them always on when the parking lights are on. That's what I did, except I added aftermarket lights to the non fog bumper. See my post below.

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post #3 of (permalink) Old 09-12-2016, 08:03 PM
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im sure its not much help, but when i had my challenger and added fogs it cost me about $100 to get reprogrammed for them to work with factory switch. not sure if what the dealer would want would be comparable.
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post #4 of (permalink) Old 09-12-2016, 08:10 PM
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You can also get them working with a factory switch on your own. You just need to buy an inexpensive part (available on Ebay). There are details about this posted on the forum somewhere (search for "DEI 611T" or "DEI611T" and you should find it).

EDIT: Here you go: http://www.impalaforums.com/showthread.php?t=335762

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post #5 of (permalink) Old 09-13-2016, 03:40 PM
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Thought I would mention a few things that could be Important...
1. In most places you have to have your FOG lights set up in a way that they are not on if you turn on your High Beams.
2. The DEI 611 is a Latched system for use as a Timer with less then a 10a use so would need to be used with a Relay in most applications.
3. Easiest way to add Fog Lights to your car would be with some Relays that you could get from a local Automotive store or Car Stereo store.

I will post a Drawing of two 5 pin Relays. You could get away with one and one 4 pin however most places charge more for the 4 pin Relays.

Looking at my bad drawing lol on the left side relay under the words Bosch Relays is the Control Relay, Pin 85 goes to Ground, Pin 86 would have Trigger + input from your cars High Beams, Pin 87 Goes to the High Beam Output 12V+ , Pin 30 goes to a Fuse then 12V+ battery. Pin 87A would go to Pin 30 of Relay two, Working on Relay two Pin 85 Ground, Pin 86 12V+ Trigger from dash switch, Pin 87 12V+ to the Fog Lights and Pin 87A isn't used...

What this will do is when you press or flip the switch to turn on the Fog lights it will send power to Relay two, However if Relay One is powered up it will not do anything to Relay two. However if you have your normal headlights on, Relay one will be at Rest and the power will be going to Pin 30. So when you have the Fog light switch on it would then power them.. I didn't do it another way however if you want to have your Fog lights on when you turn on your head lights you could move Relay two Pin 86 to be your Headlight trigger. That could save you from having to put in a different switch for the Fog lights. I personally would like the ability to turn them on or off on a new switch.

James


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James

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post #6 of (permalink) Old 09-13-2016, 06:04 PM
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FYI - Check the thread I linked to above - all that is needed for the 8th gen Impala is the DEI-611T device. There is a diagram from BB Engineering showing how to wire it up in the 8th gen Impala. Another member has done it and confirmed that it works perfectly.

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post #7 of (permalink) Old 09-13-2016, 06:38 PM
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@jtosky I was only offering a way to save the op the extra 22+ for a part that isn't really needed. Offers no added benefit. Only would use the item of I wanted add a timer function.

When in doubt source it out to a shop that does it for a living. Always support your local small company is the way I see it.

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post #8 of (permalink) Old 09-14-2016, 07:20 AM
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I just wanted confirm that the DEI-611T does work (by itself) - without needing any additional relays, etc. The first few statements of your post made it sound questionable whether the DEI-611T would work (by itself) for this application. I just wanted to clarify that all you need is the DEI-611T. Seems to be a pretty straight-forward and clean way of adding factory foglights to an 8th gen using a factory foglight switch.

I'm sure it can be done other ways, but this is the only way I've seen it *actually* done (so far). Since the plans in that link have been successfully used by another member, you know for sure that it works.

Although, that being said, it's also important to note that the fog light symbol on the instrument cluster will NOT light up like it does from the factory. Just one difference to note.

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post #9 of (permalink) Old 09-14-2016, 08:43 AM
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Quote:
Originally Posted by jtrosky View Post
I just wanted confirm that the DEI-611T does work (by itself) - without needing any additional relays, etc. The first few statements of your post made it sound questionable whether the DEI-611T would work (by itself) for this application. I just wanted to clarify that all you need is the DEI-611T. Seems to be a pretty straight-forward and clean way of adding factory foglights to an 8th gen using a factory foglight switch.

I'm sure it can be done other ways, but this is the only way I've seen it *actually* done (so far). Since the plans in that link have been successfully used by another member, you know for sure that it works.

Although, that being said, it's also important to note that the fog light symbol on the instrument cluster will NOT light up like it does from the factory. Just one difference to note.

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The fog light symbol does light up on the instrument cluster if the factory headlight knob is used. I know this for a fact because I did this on my previous 2012 LT model.
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post #10 of (permalink) Old 09-14-2016, 08:51 AM
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Interesting - the person that used the factory foglight switch in the link I posted above said that his foglight symbol didn't work. I wonder what the difference is... Maybe he just didn't connect things properly?

DId you use the DEI-611T as well?

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post #11 of (permalink) Old 09-14-2016, 09:00 AM
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Quote:
Originally Posted by jtrosky View Post
Interesting - the person that used the factory foglight switch in the link I posted above said that his foglight symbol didn't work. I wonder what the difference is... Maybe he just didn't connect things properly?

DId you use the DEI-611T as well?

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Yes, I used the DEI-611T, but I installed the the knob first, which is a direct plugin, and the the fog light symbol came on. I didn't even install the DEI-611T or any of the wiring till a month later.
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post #12 of (permalink) Old 09-14-2016, 09:08 AM
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Strange. Not sure I understand why it worked for you and not him. But it's good to hear that it should work - that's even better then!

Has anyone else done this yet? If so, does your foglight indicator work?

Just so I understand, the foglight symbol on the foglight switch itself doesn't light up when they are on, correct? It's just a light-up indicator on the instrument panel, correct?

Maybe it only works for 2012+ (different computers)? Not quite sure.

Not sure if I'll ever actually do this (expensive mod just to add foglights), but it's nice to know that everything will work if I do decide to do it. If I could add the factory foglights to the non-foglight bumper, I'd do it for sure, but since you need to replace the entire front bumper cover (and have it painted to match), that just makes it too cost prohibitive to consider - at least for me.

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post #13 of (permalink) Old 09-14-2016, 02:26 PM
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@jtrosky you say that the link you posted shows that it worked and there was no need for a RELAY? I looked over the Post and in that POST with a photo from BB it is in the bottom of the left side of that picture that clearly shows the use of a Relay... I did look and there was another that asked if there was a need for a RELAY to make this work and IMHO that answer would be Yes. Reason is that FOG lights are going to take more AMP draw then what that box could handle. CAN IT TURN ON SOME FOG LIGHTS? YES as you said in your last message that you did it and tested it and it worked. Something to think about

Power in Watts equals current in amps Squared times the resistance in Ohms. for the sake of easy math I am going to bring up an old school light doing 100 watts, would need 10amps at 1 ohm the draw on most older Headlight switches where such 100 watt bulbs were used, them things would be hot enough to fry an egg... LOL

You can power anything you want from anything... I am not sure what you did a test with, or how long you ran your test. But I will say I am sure that you wouldn't drive very far running some CatZ MSP 120Watts powered off just the 611T. Can you set up a set of fog lights on a test bench and power up some lights. SURE... Not much Resistance without adding the extra wire needed, being setup on a bench. I am sure I could do some Welding with the box as well. But I wouldn't.

In closing of my thoughts on this. I have worked on many many cars that had problems from an install gone wrong. From Lights, Amps, Alarms, and many many more issues. Some known some tracking down the issue for the first time. My thought is there is no better way to install something then to do it right the first time.

@mwilson62000 I see now after reading this and clicking on your link (Didn't know you had link still learning this forum setup) see your setup is just as my Drawing is set up... I guess I need to look over linking from now on... I like the fact that you used the Fuse holder taps for your install however in mine tapped off the wires going to the lights. I am not a big fan of cutting holes into sealed fuse blocks where water can enter. Other then that I like that you went out of your way to make sure that water tight connections where used and dielectric sealing was also done.

James
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post #14 of (permalink) Old 09-15-2016, 03:37 AM
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Honestly, I thought that the relay in the BB Engineering diagram was an existing relay in the underhood fuse box. But, I haven't done this personally, I'm just going by what the folks that have used the DEI-611T have reported - like I said, I've only seen the factory foglights added using the factory foglight switch with the DEI-611T.

I'm assuming (which admittedly is a bad idea!) that BB Engineering used the DEI-611T in their plans (instead of a basic relay) for a specific reason. Could it have something to do with the way that the factory foglight switch works?

Instead of speculating, we might as well go straight to the source here - @carlos64030 - when adding the factory foglights, foglight switch and DEI-611T, did you also have to add an additional relay? Or does it use an existing relay?

My point is just that we *know* that the DEI-611T allows the factory foglights to work properly when using the factory foglight switch, since multiple people have done it. I also have to assume that BB Engineering specifically used the DEI-611T over a simply relay for a reason. Since we know it works and it's inexpensive (~$20 vs. ~$5-$10 for a standard relay), why bothering trying to "reinvent the wheel" here? We already have well-designed and professionally printed plans specifically for this purpose from BB Engineering.

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post #15 of (permalink) Old 09-15-2016, 04:40 AM
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Quote:
Originally Posted by jtrosky View Post
Honestly, I thought that the relay in the BB Engineering diagram was an existing relay in the underhood fuse box. But, I haven't done this personally, I'm just going by what the folks that have used the DEI-611T have reported - like I said, I've only seen the factory foglights added using the factory foglight switch with the DEI-611T.

I'm assuming (which admittedly is a bad idea!) that BB Engineering used the DEI-611T in their plans (instead of a basic relay) for a specific reason. Could it have something to do with the way that the factory foglight switch works?

Instead of speculating, we might as well go straight to the source here - @carlos64030 - when adding the factory foglights, foglight switch and DEI-611T, did you also have to add an additional relay? Or does it use an existing relay?

My point is just that we *know* that the DEI-611T allows the factory foglights to work properly when using the factory foglight switch, since multiple people have done it. I also have to assume that BB Engineering specifically used the DEI-611T over a simply relay for a reason. Since we know it works and it's inexpensive (~$20 vs. ~$5-$10 for a standard relay), why bothering trying to "reinvent the wheel" here? We already have well-designed and professionally printed plans specifically for this purpose from BB Engineering.

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Yes, I used a stand alone relay. I kept it simple and purchased a heavy-duty H11 wiring harness that has the relay, fuse and bulb pigtails bundled together and ready to install. The harness I used looked like this:

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