The door locks and the power windows get power through separate wires
(they don't even share a ground lead) so the fact that the power locks
work does not mean much.

As you probably know, each window regulator has its own fuse. The fuse
for left rear is #7.

If you open up the rear door panel, try unplugging the wires to the
motor and measure the voltage at the wires as you operate the switches
(try both the one in the driver's door and the one in the left rear
door). On "UP" you should see battery voltage with positive at the
RED/YEL wire and negative at the RED/BLU wire. On "Down" you should get
the opposite polarity.

Measuring at the switch in the left rear door, there should be battery
voltage at YEL/BLK (with respect to ground) any time the ignition is on.
With the driver's door switch left alone there should be continuity to
ground on both the YEL and the YEL/GRN at the switch in the left rear
door.

To check the motor apply battery voltage to the terminals at the motor.
If nothing happens, reverse polarity and try again. If nothing happens
either way, your motor probably has failed.

Let me know if you want scans from the service manual.

gsp wrote:
>
> Hello,
> Need help with 93 Civic LX; left rear electric window will not raise
> using switch at either driver's door switch panel or rear left door switch.
> Have full access to rear door panel. Left rear door lock is operable so
> current is getting to the door panel; wires leading from door to center post
> do not appear frayed. 20 Amp fuse for electric window intact. Trying just
> to raise window to fully "up" position; if the window regulator is broken,
> is there a way to manually raise the widow to the "up" position? Any help
> with this would be appreciated. Haynes manual is not helping much.
> George