'03 OEM Fog Lights Install

Going to help a buddy install OEM fog lights in his '03 GMC Sierra 2500 HD. Posted this in the GMC forum, but there's way more action here and I'm hoping the only difference is in the fog lamp style between the two. Question is about the wire hookup to the underhood BEC (bussed electrcal center). Written directions say to put it into receptical "D6" of the "forward lamp 32 pin connector". Drawing right below that shows it going into the "A4" receptical. Can anyone verify which one is correct using an '03 and up service manual wiring diagram for the fog lights? Thanks..........Steve

would the wiring not already be in place? You'll have to get the BCM programmed for them with a tech II scan tool

would the wiring not already be in place? You'll have to get the BCM programmed for them with a tech II scan tool

Thanks for that info, although the instructions mention nothing about programming the BCM. I'll look into that. All the in the cab wiring is supposed to be there. It's the wiring harness that comes with the OEM kit that I need info for the correct receptical to place the power wire to the fog lamps.

My 2003 sierra didn't come with foglights from the factory. I purchased one of the oem kits from a guy off of ebay sometime back. The kit came with the lights, harness, button, and instructions. To install the kit, you don't have to reprogram the BCM. You simply pop out the button on the dash and install the new one with the fog lamp and cargo light button. Then, you run the wires from the harness to the button and to the BEC. You have to unbolt the BEC and pull out the right pin and install the wires from the harness there. I have the diagram which shows the right pin in my shop somewhere. I will look for it tomorrow and try to post you a pic. It's too late to go find it now. I hope this helped, and I will try to get the diagram for you.

My 2003 sierra didn't come with foglights from the factory. I purchased one of the oem kits from a guy off of ebay sometime back. The kit came with the lights, harness, button, and instructions. To install the kit, you don't have to reprogram the BCM. You simply pop out the button on the dash and install the new one with the fog lamp and cargo light button. Then, you run the wires from the harness to the button and to the BEC. You have to unbolt the BEC and pull out the right pin and install the wires from the harness there. I have the diagram which shows the right pin in my shop somewhere. I will look for it tomorrow and try to post you a pic. It's too late to go find it now. I hope this helped, and I will try to get the diagram for you.

Thanks. Any diagram you've got would be appreciated. Really don't have any problem doing this, it's just that ? of "D6" (written) or "A4" (visual)..........Steve