I have a question about removing the control module (seat belt interlock
and key buzzer) from my late 74 TR6 (CF27582).
I think I understand what almost everything does. Although I don't
understand why the control module is so complicated (what's this circut
board doing in my car?)
My understanding:
1. White - In - Switched power thru the ignition switch
2. Black/Slate - In - Seat sensor switch - Ground when closed
3. Black/Red - In - Seat belt latched switch - Ground when closed
4. Purple - In - Unswitched power thru the fuse box (always on)
5. Black/Blue - In - Seat sensor switch - Ground when closed
6. Black/Brown - In - Seat belt latched switch - Ground when closed
7. Green/Lt Green - In - Seat belt neutral switch - ?????
8. Lt Green/Orange - Out - Seat belt light - Ground when active
9. Black - In - Ground
10. Black/Orange - In - Door switch and key contact - Ground when closed
11. White/Red - In - Key start - Power when active
12. White/Orange - Out - Starter relay - Power when active
It would seem likely that #4, the unswitched power is used to supply
power to the insanely annoying key/door buzzer in combination with #10
the door switch/key contact.
It would seem likely that #1, the switched power is used to supply power
to the seat belt buzzer in combination with the ground supplied by
#2,3,5,6.
It would seem likely that something more complicated is happening, since
ground is supplied to #8, the seat belt light, only when the ignition
key is switched on.
It would seem likely that #11, key in start, is used to determine that
power should be sent to #12, the starter relay (assuming there are no
butts in the seats without seat belts fastened). But, is the power sent
straight from #11 out to #12 or is the power from #1, or #4. Does it
make a difference?
Obviously, the seat belt switches are long gone. So there is no problem
with the seat belt buzzer.
It is easy to disable the door/key buzzer by simply taking the door
switch out of the loop. I did this in the first week at the request of
the wife.
Now the problems/questions:
If the outside cover is not connected to ground, the insanely irritating
buzzer sounds. This seems like a bad thing. Perhaps this is normal, but
it seems to me it was not designed to work this way. Is this an
indication of failure? I really don't want the whole thing to fail and
be unable to start the car without crawling under the dash. And it
seems unlikely I'll be able to find a replacement control module if this
one goes bad in a big way.
So, can I remove the whole control module simply by connecting #11 to
#12?
Are there any other considerations here?
Would anyone care to expand on my guesses about how this thing
functions?
Thanks,
jim
74 TR6 CF27582UO (Josephine)
"Can't this car go any faster? 'Cause I can still see where I am."
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