Heated Washer Fluid Switch, 07 GMC Sierra

Well, that does sound like what I want then. They are cheap enough, I will get one and see what happens. And, thanks again for your help.

OK, I lied. I cant find anyone local that has a DEI 611T in stock. So, Im going to try to do it with a relay instead. And, I think I got it figured out, just wanted to run it by you and see what you think. 12V source going to post 85 of the relay Ground going to post 86 of the relay Ground going to post 30 of the relay Post 87 of the relay will have a wire going to the black wire on position 3 of the plug for the switch Then the light green wire from position 7 will run to the BCM as the trigger wire Then just splice the dark blue wire in position 8 into the wire on position 7 Now, in my head, this will work. But I'm sure just about everybody on this site knows more about this than me. That's why I wanted to run it by the pros first.

No, it won't work. What wire is the "trigger" one at the BCM?

From what I found out, it is a white with black stripe wire, in the pink plug, pin #2, on the BCM.

So that wire with a positive signal will turn on just the cargo lamp? From the schematics i've seen, the cargo lamp and dome lamp circuits are in parallel with each other. Nothing independent.

Well, from what I've read. I have yet to do this mod, because of wanting to use the washer switch. But several people have done it and said it worked. I got the idea from another board that I belong to. I will post the link up so you can see what it says. I may have missed something that you will see. http://www.silveradosierra.com/how-to-articles/how-to-add-a-separate-switch-to-turn-on-your-cargo-light-t2232.html

Ok, did more research. Schematics show the WHITE/ black in question to be an output (positive from BCM). It then goes to the junction block ,by the firewall, left of the column (Mid BEC). From there to the roof harness and then the cargo light. The switch in the link shown is a SPST (on-off) type. The switch for the windshield heater system is a SP-NO (momentary). You need a way to make the momentary button latch, which is why i recommended the 611t.

Oh, ok. I had a couple of relays laying around, and couldn't find the dei 611t in stock anywhere. That's the reason I was trying to use the relay. I will order the dei 611t. But, don't be surprised if I come back here and ask you how to hook it up! Thanks again for all your help.

Ok, I got the 611T in the mail yesterday. Still looking at it to try and do this right the first time. Take a look at my plans here and see what you think. ON THE 611T: Black: Ground Green: Ground Red: 12V hot Yellow: Ground Then the brown wire will hook to the black wire (pos #3) at the switch. AT THE SWITCH: The light green (pos #6) will hook to the white with black stripe at the BCM. And the dark blue can hook to the light green wire. The yellow wire for the dash lights are working fine now. So I don't need to do anything to it. And the switches on the 611T 1 shouldn't really matter 2 normally open (up) 3 latched (up) 4 - input (down) Again, I think this is right, just don't want to burn anything up!

Black: ground, Red: 12V battery, Green: Light green at switch, Brown: 12V battery, Yellow: WHITE/ Black at BCM.