Martin, Microcontrolelr was a bit excessive for the fan relays, but couold be a very good alternative for the door lock module. After looking at the pictures in the vault of a stock relay harness i came up with the idea of having two relays and have one on a delay. After i came up with the initial design i alsmot laughed on how simple it really was, 3 small transistors, 2 resistors and a cap. I actually fitted the circuitry in project box the size of a keyless entry remote (not recomended, was a pain to build). I have not tackled my fan fail light yet, and really does seem that inportant to me (like the door lock light). Well it's a hot day out, lets seem if mine functions properly ;) Happy Easter! - Shain #10140 ----- In Response To ----- > Shain, give me two weeks and I'll have posted my design for > this very function. I have also worked out the system for > the fan fail light which you need the stock wiring to be > able to use. > > A microcontroller is a bit of an overkill IMO. A couple of > comparators and some RC timers are all I'm going to use. > It keeps things simple. > > Martin > #1458 [moderator snip]