Hey,

266 thousand on 87 4Runner. Back glass used to go down with console switch and key. Recently it would go down occassionally but now nothing. I swapped the circuit breaker with a known good one. Even jumpered the breaker plug.

Any way to get the glass down manually to open gate so I dont have to try to get my 6'2" body over the seats to try and diagnose? Any suggestions on how to test to see if motor is bad? Perhaps a safety switch somewhere?

Thanks

 

Not sure if its the same as my 2nd gen but if the wiper isn't seated back in the off position the window won't go down, just a thought.

 

The relay box is behind the driver seat inside / under a cover. Pull it out and you can use two wires to hard jump it down. Probably needs a motor, so you will probably have to go back there and manually lower it.
Might be better to find a small framed person to strip the tailgate and coax it down.

The motor is DC reversable so if you take a 12vdc battery and a couple of large gauge wires w/ probes you can get the motor to lower it all the way down so you can overhaul the tailgate. Sounds about the time for the motor to fail.

 

Forgot that little interlock. Do try first!

 

I've got the rear panel off exposing the gate mechanism, window motor and such. How can I manually lower the glass?

I forgot the interlock too but that wasn't it. However, now the back wiper doesn't work either. It just did stop working cause I used it a week ago.Haven't used the back window for awhile.
Thought the window lock switch between the wiper and window switch might have gotten pushed on but it was off. Will try reversing motor with 12 v to get window down the get the DVM out for some elect. troubleshooting. Thanks

 

you'll need to pull the rear panel behind the drivers seat, and check out the relay box.

i replaced all of the relays on the circuit board, they are cheap, but then i found problems with the connection between the wiring harness plug getting too loose, where it plugged into the circuit board.

i squeezed the connectors on the harness in order to get a better connection, using a very small screwdriver, then zip-tied the plug up, so that it wouldn't get loose and slip down.

 

good info right there !!


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How can the window be manually lowered?

I will also check the relay. Thanks.

 

You can put a battery in the rear and run two wires to the plug on the motor and manually bring it down that way. It is a pain to do it that way but how I have done it. Once you have the cover off of the tailgate, the plug is mounted on the inside of the frame. https://www.yotatech.com/forums/f199...l#post51723243 Post 185, just above this one has some information on it. I bypass my safety swithces with the ground wire trick, if the realy is good it will work for a temporary trick as well.

 

There is really no easy way to get the hatch window down with out the motor.

The only way it can be done is by physically removing the motor from the regulator .

Even so the regulator is under tension .

If the motor is no longer working at all with it engaged in the lowering direction sometimes it is possible to assist the window going down .

Remember old glass gets brittle and breaks ( shatters) quite easy Two stitches and $ 1800.00 later I will not forget .

 

If you're in a hurry, then go for manually and directly powering up the motor...

However, if you have time... yes below could cause intermittent issue.

On first gens, as soon as wiper leaves the park of retract position, rear wiper retraction detection switch closes so pin 13 of relay is grounded.

Try removing pin 13 from the connector (schematic here), and see if problem disappears.