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Old 01-06-2020, 02:04 AM #1
TheSaturnV TheSaturnV is offline
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Back Window Not Working: Check these wires

Installed a new backup camera this weekend and accidentally stumbled upon the reason my back window quit rolling up/down. At first it started failing intermittently, then finally quit altogether.

In the main wiring harness from the roof into the tailgate I found not only the power wire for the rear window (heavier white with black stripe), but also TWO others that were broken.

Both green wires, one with a white stripe and one with a reddish brown stripe. Anybody know what those two wires do?

Anyway, if your back window quits check these wires out. Just pull the boot up where it comes out of the roof. Looks like the motion of the tailgate opening finally broke a few.

Updated: I had added this photo, no idea where it went.
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Back Window Not Working: Check these wires-img_6512-jpg 

Last edited by TheSaturnV; 01-06-2020 at 11:58 AM. Reason: photo missing
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Old 01-06-2020, 04:52 PM #2
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Thanks for posting this - mine is fine, so far. I'll keep this in mind when it isn't....


Luck and enjoy those Toyotas. : ^ )))
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Old 01-06-2020, 05:34 PM #3
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Very typical of older vehicles. I been warning people for years if windows and locks are not working properly to check the wire boots for broken wires. If I remember tonight. I will post the Electrical wiring diagram for the tailgate.

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Old 01-06-2020, 05:51 PM #4
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Quote:
Originally Posted by brillo_76 View Post
Very typical of older vehicles. I been warning people for years if windows and locks are not working properly to check the wire boots for broken wires. If I remember tonight. I will post the Electrical wiring diagram for the tailgate.

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please do!

Im having the same issue and opened up all of the looms/boots yesterday to check them. All intact so i started testing and can get the motor to move if i skip the control unit so i supsect its the culprit.
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Old 01-06-2020, 07:38 PM #5
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Thanks brillo, that would be very helpful. I did look through the service manual PDF, but Im not all that good at finding the right schematics. I was just about to start looking for a new window motor because I could hear the relay clicking, but turned out to be practically free to fix instead.

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Old 01-06-2020, 10:12 PM #6
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Well the EWD is busted into circuits mostly. I looked through all 1996 thru 2002 years quickly and found that the 1996-1998 look identical and the 1999 thru 2002 look identical which is fairly common as 1999 was the hybrid year.

So here is a 1998 EWD for the rear power windows and rear wiper
and here is a 1999 EWD for therear power window and rear wiper
Attached Images
File Type: pdf PowerWindow_Rear_Wiper_Washer98.pdf (75.9 KB, 153 views)
File Type: pdf Power_Window_Rear_Wiper_and_Washer_1999.pdf (88.6 KB, 101 views)
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Old 01-06-2020, 10:35 PM #7
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Quote:
Both green wires, one with a white stripe and one with a reddish brown stripe. Anybody know what those two wires do?
looking like the Green White GW is your 3rd High stop light on your tailgate.
Rear defroster in the tailgate possibly brown.

I didnt locate the Green reddish brown strip wire.
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Old 01-07-2020, 01:28 AM #8
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Fantastic. I haven't driven this truck very much in the past few years so my "3rd" brake light may very well have been out and I just thought it was the bulb. I'm thinking that one of those greens was Green-Red, which says it belongs to Tailgate Control Switch "UP" which makes sense because when it started to fail I noticed I could roll it down with ease, but sometimes getting it to go back up was a challenge. Also turns out the White-Black is a ground.

Thanks a million for the PDFs and here's the T4R in question: 2000 4WD w/DL
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Back Window Not Working: Check these wires-img_4390sm-jpg 

Last edited by TheSaturnV; 01-07-2020 at 01:32 AM.
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Old 01-07-2020, 12:49 PM #9
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Quote:
Originally Posted by brillo_76 View Post
So here is a 1998 EWD for the rear power windows and rear wiper
and here is a 1999 EWD for therear power window and rear wiper
Much appreciated!
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Old 01-07-2020, 09:54 PM #10
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Originally Posted by TheSaturnV View Post
Fantastic. I haven't driven this truck very much in the past few years so my "3rd" brake light may very well have been out and I just thought it was the bulb. I'm thinking that one of those greens was Green-Red, which says it belongs to Tailgate Control Switch "UP" which makes sense because when it started to fail I noticed I could roll it down with ease, but sometimes getting it to go back up was a challenge. Also turns out the White-Black is a ground.

Thanks a million for the PDFs and here's the T4R in question: 2000 4WD w/DL
Ah a later model one. :]

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Old 01-07-2020, 09:54 PM #11
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Much appreciated!
Hope it helps.

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Old 01-07-2020, 10:04 PM #12
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W/B is always ground. I was tired of staring at screens all day so I gave up looking for the Green red. I would say you are correct. The other green wire I found in the stop light circuit. I just didn't include the diagram.


If you ever see cracked insulation in these joints that section of wire is done. It may not be broken now but in 6 months to a year it will be.

I could never figure out way they didn't put in replaceable wire joints in all these boots. So you could just unplug the wire in both sides and plug new section in but that would cost more.

I had my share or broken wires or shorts in the jams over the years.

Mostly it's the drivers door and your tailgate boots that get you.

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Old 01-07-2020, 10:20 PM #13
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What is the best way to fix any broken wires here? How far back can you get to allow a good splice? And how much is usually bad? Do you just have to replace an inch or two or do you need to do a few feet?



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Old 01-08-2020, 02:45 AM #14
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Just get a foot or so of automotive wire in the same gauge and splice in. (Westlake/Ace Hardware sells it by the foot) The wire really isn't bad, although the insulation does get a bit tired and brittle. The problem is that it's been bent back and forth many 1,000s of times and finally breaks apart. You don't need to splice in much, just a couple of inches. Remember, you've got to be able to tuck it all away and pull the boot back over.

What you cannot do is try to pull the broken ends of the wire together and solder that. Excessive pulling on the wires will just cause another break somewhere else in the harness. In this particular area the space is very constricted and you won't have very much wire at all to work with. Pull the boot back as far as you can and if at all possible get some heat shrink over all the joints.
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Old 01-08-2020, 08:48 AM #15
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@TheSaturnV is correct. The only issue when you have to splice in the same area as were it broke is it will break again where the soldered it together at either end that can flex. Matching the gauge of wire is very important.

However, it's a very long time before it will break again.

I mostly splice the wire on both sides of the flexing area. By doing it this way. I shouldn't have to replace it again. As I tend to hang on to vehicles a very long time.

Granted, at times it's not easy to do and to get to both sides of the wires. So you can just do the best you can to fix and and resinsulate that wire.

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7 3rd gens listed in the build thread (2 are parts mobiles)
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Brillo's Bucket Fluid Ex changer: https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information: https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html
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