1991 toyota camery passanger moving seat belt doesn't work. tested motor and it is good. i am not getting any volatge to motor.

SOURCE: 1991 Camry seat belt

I had exactly the same problem and also power window problems. I found the wires in the bundle in the door jamb were broken in several places. When you open/close the door, the ends of the wires make contact intermittently and allow your seatbelt to move.
This wire bundle bends every time the door is opened, and the old, now brittle wire insulation breaks, then the copper conductor inside breaks.
You will have to take off the door panels for access.Pull the wiring out of the connector from the chassis side, pull the wires out of the feed through in the door so you have room to work, unwrap the tape and splice the wires that are broken. You will probably have to do this on both front doors since they are used so much.
Also, some of the wires may be broken inside the insulation, but the insulation looks OK:

so make sure to check for operation of seat belt/windows/doors/power locks, etc. by bending the bundle while holding the appropriate button. Otherwise you may have to do this again.
Try to buy low diameter splices because you will not have a lot of room if you splice too many in the same place (They all break in the same area)-otherwise you will have to install a new wire and splice at both ends.

SOURCE: 94 toyota camery no spark

I had the same problem recently but replacing the ignition Coil under the distributor (inside) solved the problem. Also replaced the distributor Cap and rotor at the same time.

SOURCE: i need a diagram of a 1991 toyota camry motor to replace a timing belt

some one directed me to autozone.com where i found what i was looking for. it is free once you register your car information. thank you so much.

SOURCE: 1991 Toyota Camry Automatic seatbelt harness

http://www.toyotanation.com/forum/showthread.php?t=300887
Full version about Automatic Seatbelt troubleshooting for 87-91 Camry written by Professor Oleg Turkin

SOURCE: power steering belt on 1991 toyota camry

Locate the idler pulley. Loosen the nut in the center of the idler pulley. Then loosen the bolt that protrudes from the back of the pulley. This will let the belt go slack.