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Old 06-15-2020, 12:16 PM #1
earth1 earth1 is offline
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tailgate motor wiring

Let me know if there is a better section to post this. I have a 1st gen body/3rd gen everything else so unfortunately I may not get the best response in Gen specific sections.

Rear window got stuck down after not starting the truck for 2 years, I lowered the window to open the tailgate- motor worked and then window wouldn't go up. Started looking into the tailgate/rear panel wiring and found a birds nest of both gen's harnesses with lots of unused plugs and DIY clamp connectors. Very much a hack job by PO. My electrical knowledge is limited, but I could fumble through with a diagram, test light and multimeter. I want to try this myself before trying to find a shop that will even do it.

I've been over 4crawler info and the 1st gen diagram. I'm getting clues from the internal cargo switch mod write ups on both gens. My ignorance with electrical is confusing the issue of which "extra" plugs in the harness clusterF might be redundant or if something there is necessary to complete a circiut.

Center console/switch from 3rd gen.

No tailgate key cylinder switch. I removed the entire plastic housing years ago after making a bumper/tire carrier that was too close to close :bang:

I believe rear wiper function was eliminated long ago, doesn't appear to be connected/never worked.

99 relay control module did have some interior corrosion due to 1st gen body rust, corrosion was only on 1 corner- not near the internal relays. I cleaned it as carefully as possible. Test light confirms one pin has constant Bat, one pin has key on- module is working to some degree.

Shell safety switch tests OK with multimeter/Ohms- opens & closes.

1.How do I test motor with 12v? Bat +/- to which connector (87 tailgate wiring) and which polarity to which pin?
Assuming motor works:
2. Anyone have a 96- mid 99 relay control module diagram? I found the FSM online but in 2152 pages, I can't find a table of contents or a map of that connector.
3. a) Can I operate the window from the control module harness connector (module removed)/ what are the pin receptacles?
b) Can those pin receptacles in the harness connector be tested by grounding a test light to the right pin? By jumping a combo of pins? By applying 12v?
4.How do I jump the connector at the front console switch? I have not tested the console switch itself for Ohms
5) If I find no power at the rear panel mess, how do I start to find a ground issue or short?
6) Is there a better forum with some wiring guru's? IH8MUD, others?
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87/99 frankenshit 4Runner hybrid (1st gen body on a 3rd gen)
66 FJ45 workrod
13 4Runner Limited

Last edited by earth1; 06-15-2020 at 12:19 PM.
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Old 07-06-2020, 05:03 PM #2
earth1 earth1 is offline
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I'm getting desperate here so I'm bumping this thread after seeing 140 views.

I'm pretty inept with wiring and trying to get this thing to roll up with the console switch. Anyone with wiring knowledge that could help me troubleshoot? I have a new motor and can operate it now with direct power. I'm stuck.
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87/99 frankenshit 4Runner hybrid (1st gen body on a 3rd gen)
66 FJ45 workrod
13 4Runner Limited
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