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Rear Switch for Tailgate Window - Procedure
Contributed By: Bill Kelsey
The wiring for these electric lift tailgate windows is pretty simple, and if it works from the dash but not from the tailgate it is pretty certain the tailgate switch is defective.
ou will need to remove the tailgate carpetting and access panel to see the following.
Briefly, there are three wires that control the tailgate motor:
I may have the functions of the brown and tan wires reversed.
Since the dash switch and the tailgate switch share the same wiring, and the motor works from the dash switch, the problem should be in the main (keyed) tailgate switch, which you should plan on replacing (new of used), unless you can repair yours (I don't know if these are repairable -- I went the below route for a permanent fix).
You can test the tailgate switch as follows (from the 1979 TSM); note that you can use a multimeter in place of the test lamp:
Tailgate Window Switch
Tailgate Window Safety Switch
Another alternative is to find a manual tailgate life and install it in place of the electric one. The only thing that goes bad with these is that the teeth inside the outside crank handle may eventually wear out and the crank handle have to be replaced. The electric-to- manual lift parts swap is very easy -- a couple of hours work if you take your time.
Then you can have what Jeep never sold -- a manual rear window with a defogger!
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