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95 4Runner rear window. Age old question maybe.

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95 4Runner rear window. Age old question maybe.

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Old 11-06-2018, 08:35 AM
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95 4Runner rear window. Age old question maybe.

My first ever toyota of any type.
Window works as it should from inside at the console. Tailgate key only goes up. Key is a little wonky trying to go up but is does seem to go all the way.
Based on what research I have done it could have something to do with the wiper position sensor. But why does the inside switch work?
Any help is appreciated.
Also, I'll post up some photos of the new ride as soon as I get this done.
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Old 11-06-2018, 09:58 AM
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Not the wiper interlock, or window would never work.
Likely an open wire between the tailgate key switch and the relay box in the drivers rear quarter panel. Or possibly a defect in the key switch itself.
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Old 11-06-2018, 11:11 AM
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I accessed the tailgate switch and jumped across the terminals. Same thing, up not down. So now probably need to access the relays in the left rear quarter panel.
That will have to wait until Thursday, got a couple jobs backed up now.
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Old 11-06-2018, 11:20 AM
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duplicate post removed.

Last edited by millball; 11-06-2018 at 11:38 AM.
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Old 11-06-2018, 11:33 AM
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Originally Posted by bmiller View Post
I accessed the tailgate switch and jumped across the terminals. Same thing, up not down. So now probably need to access the relays in the left rear quarter panel.<br />That will have to wait until Thursday, got a couple jobs backed up now.
What does 'jumped across the terminals mean???? The key switch works by grounding one pin on the relay module. One pin is grounded for up, and a different single pin grounded for down.I installed an inside cargo area switch for the back window that operates from these same two pins, but I don't have the schematic at hand to give the pin-out numbers. Looking at the wire colors at the switch and at the relay box plug might tell.

The tailgate key switch is the only rear window switch that ordinarily works even when the ignition is off

Last edited by millball; 11-06-2018 at 11:39 AM.
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Old 11-06-2018, 04:07 PM
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I pulled the connection apart that connects to the tailgate switch. Then used a multimeter and found one hot and two not. So assumed one of the nots went to up and one to down. With the window part way down I used a jumper wire and jumped from the known hot to each of the others. The window went down on and nothing on the other.
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Old 11-06-2018, 04:41 PM
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Window works as it should from inside at the console.
Then... piece of cake.

Originally Posted by bmiller View Post
...Then used a multimeter and found one hot and two not.
Good job testing and sharing results.

The "NOT hot" one is the one that goes to ground.
BOTH of the other two should be "hot" = meaning have voltage. That voltage is not exactly battery voltage but "leakage" voltage through the relay circuit.
Connecting either of the so-called "hot" wire (only one at a time, please) to ground or the "not hot" line should cause the window to roll one way or the other.

The supposedly "hot" line that does not have voltage most likely has a broken wire between it and the relay module. Inspect the flex cable between body and tailgate for broken wire. If no finding, the whole wire run between tailgate switch and the relay module.

Last edited by RAD4Runner; 11-06-2018 at 04:43 PM.
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Old 11-06-2018, 04:55 PM
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Thanks, i was looking at it backwards. Thinking one hot source sending voltage to the other poles in the connection. As opposed to two hots sending to ground. Tons of work in the way until friday, so back at it then.
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Old 11-06-2018, 06:00 PM
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i ended up replacing my tailgate key switch and having it rekeyed to match the ignition/front doors when i added a constant hot window switch in the back
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