1999 Pontiac Montana wipers

TEST 4: FRONT WIPERS INOPERATIVE IN LOW SPEED, DELAY, OR MIST MODES, HIGH SPEED IS OKAY 1. Turn ignition switch to RUN position. Turn wiper/washer switch to LOW position. Using DVOM connected to ground, measure voltage (backprobe) at wiper/washer switch 48-pin connector C201, terminal "E2" (Dark Green wire). Connector is located to left side of steering column, near base. See Fig. 1 . If voltage is more than one volt, go to step 3 . If voltage is less than one volt, go to next step. 2. Check for poor connection at connector C201, or for open in pigtail to wiper switch. See WIRING DIAGRAMS . If wiring is okay, replace wiper/washer switch assembly. See appropriate STEERING COLUMN SWITCHES article. 3. Measure voltage between wiper/washer switch 48-pin connector C201, terminal E3 (Gray wire) and ground. If voltage is more than one volt, go to step 5 . If voltage is less than one volt, go to next step. 4. Check for poor connection at connector C201, or for open in pigtail to wiper switch. If wiring is okay, replace wiper/washer switch assembly. See appropriate STEERING COLUMN SWITCHES article. 5. Disconnect wiper motor 5-pin connector. Measure voltage between wiper motor connector terminal "D" (Dark Green wire) and ground. If voltage is more than one volt, go to next step. If voltage is less than one volt, repair open in Dark Green wire between wiper motor connector terminal "D" and connector C201, terminal "E2". See WIRING DIAGRAMS . 6. Measure voltage between wiper motor connector terminal "E" (Gray wire) and ground. If voltage is more than one volt, replace wiper motor cover assembly. See WIPER MOTOR CIRCUIT BOARD under REMOVAL & INSTALLATION. If voltage is less than one volt, repair open in Gray wire between wiper motor connector terminal "E" and connector C201, terminal "E3". See WIRING DIAGRAMS . Page 1 of 1 3/25/2010 ...

TEST 6: FRONT WIPERS DO NOT PARK
1. Turn ignition switch to RUN position. Turn wiper/wiper switch off. Disconnect wiper/washer switch connector C201 located to left side of steering column, near base. If wipers do not park properly, go to next step. If wipers park properly, replace wiper/washer switch. See appropriate STEERING COLUMN SWITCHES article. 2. Measure voltage between ground and connector side of C201, terminal E2 (Dark Green wire). See Fig. 1 . If voltage is less than one volt, go to step 4 . If voltage is more than one volt, go to next step. 3. Reconnect wiper/washer switch connector C201. Disconnect wiper motor 5-pin connector. Measure voltage between wiper motor connector terminal "D" (Dark Green wire) and ground. If voltage is less than one volt, go to next step. If voltage is more than one volt, repair short to voltage in Dark Green wire between connector C201, terminal E2 and wiper motor connector terminal "D". 4. Replace wiper motor cover. See WIPER MOTOR CIRCUIT BOARD under REMOVAL & INSTALLATION.
Can also be the crank arm needs to be replaced:
FRONT WIPER MOTOR CRANK ARM ASSEMBLY
Removal 1. Remove wiper system module cover. Remove drive link from wiper motor crank arm. Loosen 2 screws and remove wiper linkage assembly from wiper motor crank arm assembly. Go to next step. 2. Remove crank arm cover and seal. Loosen screw holding wiper motor crank arm assembly to wiper motor assembly. While holding up on crank arm, tap on screw with soft-faced mallet to loosen crank arm from wiper motor. Remove screw from crank arm. Remove crank arm from wiper motor. Installation 1. DO NOT rotate wiper motor assembly shaft during installation of wiper motor crank arm assembly. Turn ignition switch to ACC position. Set wiper switch to DELAY position. Turn ignition switch to OFF position when wiper motor is in inner-wipe position. 2. Install wiper motor crank arm assembly to wiper motor assembly while maintaining a .157- .315" (4-8 mm) gap between wiper motor crank arm assembly and tab. Install retaining screw and tighten. Install wiper linkage assembly onto front wiper motor crank assembly. Tighten wiper linkage screws to specification. See TORQUE SPECIFICATIONS . To complete installation, reverse removal procedure.

As for the window, look in the top right corner of our page, click on more repairs, then look for window motor or regulator replacement, or remove the trim panel and see if a bolt came out of the frame and re install it.