'94 4Runner woes...serious woes.

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RZF - 27 Apr 2007 03:45 GMT

My '94 SR5 4Runner window will not roll down!

I had this problem when I first got the truck 4 years ago. I fixed it by
replacing the rear-window drive motor and the rear-window ECU relays.

The strange thing is that it will roll up...just not down. I'm pretty good
with mechanics and electronics, but this has me baffled. Here are the facts:

1. The rear-window rolls up perfectly. No resistance since the mech assy. is
clean and well lubricated.
2. It does not roll down.
3. When I try to roll it down from the rear door key or the front control I
can hear a relay click from the rear-window ECU.
4. I've replaced the rear-window ECU with a known good one. Nothing.
5. I've verified the drive motor spins in both directions by removing and
testing it.
6. I beat my head against the bumper and cried...nothing.

If anyone has any ideas please offer them up because I'm close to losing my
marbles.

Cheers,

Richard.

magnu @ telus . net (no spaces)

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Jeff Strickland - 27 Apr 2007 03:49 GMT

Does the window regulator work? It could be bound in the down direction, but
work freely in the up. Can you use a tool in place of the motor and drive
the window down by hand?

> My '94 SR5 4Runner window will not roll down!
>
[quoted text clipped - 26 lines]
>
> magnu @ telus . net (no spaces)

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Mike - 27 Apr 2007 16:21 GMT

> My '94 SR5 4Runner window will not roll down!
>
[quoted text clipped - 12 lines]
> I
> can hear a relay click from the rear-window ECU.

Is the relay part of the ECU or can it be replaced seperately ? Is the
relay bad ?

> 4. I've replaced the rear-window ECU with a known good one. Nothing.

Are the relays part of the ECU or can they be replaced seperately ?

> 5. I've verified the drive motor spins in both directions by removing and
> testing it.

OK. Get a multimeter and a wiring digram. Disconnect the wiring to the
window motor and check for power and ground, at the connector, as you
operate the switch. Power and ground should swap wires from window up vs.
window down. Find out what is missing (power/ ground) when the window won't
go down and follow the wiring back until you find the problem.

> 6. I beat my head against the bumper and cried...nothing.
>
[quoted text clipped - 7 lines]
>
> magnu @ telus . net (no spaces)

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Speedy Pete - 28 Apr 2007 00:55 GMT

I also had troubles with the rear window but it was related to RUST and
the lock mechanism.

-SP

> My '94 SR5 4Runner window will not roll down!
>
[quoted text clipped - 22 lines]
>
> magnu @ telus . net (no spaces)

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