Fog Light Installation - S Model (with Pics)

[Chaddz3]

Originally Posted by Tiger-Heli

I have a few more annoying questions:

First off - I'm not crazy about splicing wiring on a brand new car unless you absolutely have to. Is there a real reason that you spliced into the BCM connector wiring rather than using something like an add-a-circuit and using a 12V Constant and 12V IGN Fuse at the fuse panel? (I think there probably isn't a fuse that is hot when the parking lights come on, so you probably DO have to splice there, but the above would eliminate two splices.)? (Or was it an "In for a penny, In for a pound" and if you have to make one splice, what harm are two more thing)?

I like the idea of the control module, and I'm sure it looks more professional, but couldn't you just tape the two Bosch/TYCO automotive relays together and be done with it? Like I said, it's very professional, but seems like a bit of overkill to me.



Thanks again!

The parking light circuit is not fuse protected in this car, it uses an internal circuit breaker in the BCM for short circuit protection, therefore no fuse to do the add-a-circuit with... so if i have to do one, I might as well do both that way. I could have done it with the IGN feed wire, but as long as I was in that particular BCM connector for the output wires to the fog lamps themselves it was just easier to splice the ignition feed wire there since its apart anyway... that and its easier to conceal up in the harness during reassembly. In a perfect world, I would have just replaced the terminal in the fusebox and wired directly to fuse terminal using a double up termination on the backside of the fusebox.. but they sealed the thing.. :-(

The Fog module idea basically was done primarly for ease of troubleshooting later down the road if the system develops a problem... hopefully will require less disassembly of the system to troubleshoot a potential problem then having to unwrap the harness to get to every splice and connection... I can test each circuit at the module itself then only have to disassemble to the circuit in question. and if i have a component inside the box fail its just a matter of build a replacement box, which i can do at my kitchen table, then swap everything out... mainly did it for convience. to swap the box, just requires removing the glovebox and disconnect the wires at the box. then plug in its replacement. once built its a plug and play setup.

Quote By thelaw65:
By the way, if you are gonna order a switch get the one with auto lights. Works with the S model without any modifications. I got the one with the fog light button just in case I ever wanted to add fog lights.

Got mine at Rock Auto Parts for $80.

Part # SW6863A

This was how i originally wanted to do this. I ordered a headlight switch with factory foglight button and auto lamps.. however, the body control module in my S model has the fog light control circuit not present. so the factory fog light button does nothing. The Auto lamps worked, but the fog light button did not.

Unless your BCM will accept a fuse for the fog lights where the owners manual says its supposed to go, the factory switch will not run the fog lights...