Sunroof Problems – Bentley let me down

[mike mcclurg]

Sunroof Problems – Bentley let me down

Patient is an ’89 100q. Sunroof suddenly stopped in
mid-stroke. Power windows continue to work.

Upon disassembly of the dome light/sunroof control
assembly, I find there is no power at any of the leads
to the sunroof switch, but there is power to the dome
roof light.

The problem comes as I try to find a wiring schematic
in my Bentley. Can someone tell me if I am just
missing it, or is it true that Bentley has neglected
to include this circuit in the schematics? I did find
one in the book, but I think it was for the 200
20valve. At any rate, the wire colors don’t match.

I also have a set of Mitchell schematics for a ’90 100
which at least has the circuit for the sunroof. Again
though, the wire colors don’t match. It looks from
this schematic that a whole bunch of hot leads for all
the windows and the sunroof are welded together at
some point. Since my windows still work, I’m thinking
that the break must be somewhere downstream from that
weld. Where is the weld?

If my guess is right, the hot should come into my
switch at terminal #5 on a black with blue tracer. By
the way, my switch is part #443 959 561B. If I put 12
volts on that lead, I can get the sunroof to work.

I also read in the Bentley and in my owner’s manual
and have seen in a recent thread, that there is some
overload circuit breaker for the sunroof. I don’t see
it in this schematic, though. Any idea where it is
located?

Thanks for your help.
Mike

’89 100q – My daily driver, 245,000 miles
’85 4ksq – My son’s college car
’86 5ktq – Parts car


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