Logic or sequence controller

It seems that my 74 has a electronic module in the rear compartment that I have seen referred to as a sequence controller or logic controller. All of the seat, belt and door switches terminate there. Problem is none of the wiring diagrams I have seen show this controller. My intention is to completely eliminate it but I need to know how it works first.

Thoughts anyone?

Blain

A logic controller??? What does it look like?

About 8 wires in one end and 3 out the other. Opened it up and is a full printed circuit board with I/C.


My intention is to eliminate all the "Big brother" crap.

Blain said:

About 8 wires in one end and 3 out the other. Opened it up and is a full printed circuit board with I/C.


My intention is to eliminate all the "Big brother" crap.

Click to expand...

My sympathies are with you entirely....IF you can't find a diagram...try a '73-75 vette as maybe you got into that changeover situation with your car...the '72 I have has been very proudly DE Naderized....only saftey stuff on it is the seatbelt of course, and the key in steering wheel....ALL that mechanical/electronic interlock crap is GONE, all within less then 2 weeks of owning the car....

:hissyfit::smash:

1974 was the first year for the seat belt safety interlock. The seat belt had to be buckled or the car wouldn't start. Maybe that's it?

BBShark said:

1974 was the first year for the seat belt safety interlock. The seat belt had to be buckled or the car wouldn't start. Maybe that's it?

Click to expand...

That's what I thought too, but that was nothing but a relay, as I recall in MY '72....why it was there, I dunno. but there was a switch on the side of the old seat belt housings...that I remember....maybe just a light?? I forget...

I remember so many people would just sit on the buckles seat belt, back when....

Seatbelts and airbags are the only two that make any sense, the rest is a bunch of crap...flat overboard with too much crap.....

:crap:

It IS the seat belt starter interlock relay.

Should have the following wires:

ABCDEF
GHIJKL

A light blue
B empty
C brown
D tan
E orange
F white
G light green
H to seat belt switch ?? not sure what color
I dark green
J yellow
K white
L empty

Here's the complete wiring diagram for your car:
http://www.vettemod.com/forum/downloads.php?do=file&id=47

Thanks TT. That is the same diagram I'm using but it still doesn't show the controller. Page 8 of the wiring should be it, but it does not relate at all.

Blain

Couldn't wait. Unwrapped the harness and removed all that crap. Really wasn't as bad as I thought. I have an electrical background so not too intimidated. Besides the cost of a new harness is quite a motivator.

Unwrapped.

Unnecessary junk.

Re-taped and ready.

Still would like a wire diagram if anyone runs across one.

Blain

Blain, that what you did above, is MY attitude.....winter 01-02 I had the car in the air for 6 months....rack conversion floorboards modded, pedals moved, and the entire electrical system totally rewired....MY way....only the forward lighting is in the bulkhead connector now...all the rest is hard wired....NO assy line would do it that way...not that I know of anyway....

:drink:

Try and make 'em better, aren't we?
Blain

The diagram doesn't show the controller, but it does show the harness going to it.

You had me confused TT until I went back to read the posts. That is not the relay. The relay comes off of the dash harness. Ditched that crap too. I started on the dash and engine compartment harnesses yesterday. Purged most of the related wiring. Just wish I had a way to test it all without a full installation. If I goofed somewhere it will be a bitch to find wrapped and in the car.

Blain said:

Couldn't wait. Unwrapped the harness and removed all that crap. Really wasn't as bad as I thought. I have an electrical background so not too intimidated. Besides the cost of a new harness is quite a motivator.

Unwrapped.

Unnecessary junk.

Re-taped and ready.

Still would like a wire diagram if anyone runs across one.

Blain

Click to expand...

The 74 diagrams are in the downloads section.
http://www.vettemod.com/forum/downloads.php?do=cat&id=2

Recognize these plugs? Engine harness, before wiper plugs. The single wire is the other end of the orange wire from these plugs. Looks like the single end goes to the auto trans.

Blain