1988 Buick Century custom 4 door, passing your front window regulator will not roll down. New window regulator on testing circuit outside vehicle regulator works OK. in vehicle it will not work. It will roll up but not down. relay replaced.not getting reverse polarity?anybody have any ideas?

I could see one window not working from a broken wire inside the door flex , but not both back windows . Back windows are controlled by LF door module . Both back windows have different grounds - LR G200 an RR G201 . Also both rear window switches have different power supply's .RR switch fuse # 18 30 amp . LR is fuse b# 9 40 amp . Both window motors or switche's going out at same time ???? wouldn't think so .

• Driver door module circuits open/shorted.
• Loose, corroded connectors.
• Damaged window regulator control switch.
• Damaged window regulator electric drive.
• Open fuse in fuse junction panel Fuse 39 (10A), 28 (10A), 30 (10A).
• Open fuse in power distribution box Fuse 9 (40A), 10 (40A), 8 (40A).
• Glass, Frames and Mechanisms
  
  Inspection and Verification
  
  1. Verify the customer's concern by operating the power windows/heated back window to duplicate the condition.
  1. Inspect to determine if one of the following mechanical or electrical concerns apply:
     
     
     VISUAL INSPECTION CHART Mechanical Electrical
     • Front door power window regulator damaged.
     • Front window run damaged.
     • Front door window glass out of window run.
     • Front door window glass broken.
     • Driver door module circuits open/shorted.
     • Loose, corroded connectors.
     • Damaged window regulator control switch.
     • Damaged window regulator electric drive.
     • Open fuse in fuse junction panel Fuse 39 (10A), 28 (10A), 30 (10A).
     • Open fuse in power distribution box Fuse 9 (40A), 10 (40A), 8 (40A).
     • Scratched grid.
  1. If inspection reveals an obvious concern that is readily serviced, correct the concern before continuing with Inspection and Verification.
  1. If the concern remains after inspection, connect the Rotunda New Generation Star (NGS) Tester 007-00500 or equivalent to the data link connector (DLC) located beneath the instrument panel to perform DATA LINK DIAGNOSTICS test. If the NGS responds with NO RESPONSE/NOT EQUIPPED for the driver door module, go to Pinpoint Test A . If the NGS responds with NO RESPONSE/NOT EQUIPPED for the lighting control module, go to Pinpoint Test B . If the DATA LINK DIAGNOSTICS test is passed for the drivers door module and lighting control module, retrieve continuous DTCs and execute Self Test Diagnostics for the driver door module and lighting control module to retrieve current DTCs.
  1. If self test is passed and no DTCs are retrieved, go to the Symptom Chart to continue diagnostics.
  1. If DTCs are retrieved, go to the Driver Door Module (DDM) Diagnostic Trouble Code (DTC) Index or Lighting Control Module (LCM) Diagnostic Trouble Code (DTC) Index to continue diagnostics.
  1. If the driver door module cannot be accessed by the NGS, GO to Pinpoint Test A . If the lighting control module cannot be accessed by the NGS, go to Pinpoint Test B .
  Rotunda Service Bay Diagnostic System (SBDS®) 001-00001 may also be used to diagnose this system.
  
  • Power Windows Completely Inoperative
  • Supply open or shorted.
  • Ground open.
  • Window regulator control switch inoperative.
  • Circuits open or shorted.
  • Window regulator electric drive inoperative.
  • Driver door module.
  • PERFORM driver door module self test. Service DTCs. If no DTCs are retrieved, GO to Pinpoint Test C .
  • Single Power Window Inoperative
  • Window regulator electric drive circuits.
  • Window regulator electric drive.
  • Window regulator control switch circuits.
  • Window regulator control switch.
  • Driver door module.
  • GO to Pinpoint Test D .

Go to http://bbbind.com/free_tsb.html free wiring diagrams !

• Power Windows Completely Inoperative

• Window regulator control switch.
• Circuits open or shorted.
• Window regulator electric drive.
• Driver door module.

• PERFORM Self Test to retrieve Diagnostic Trouble Codes. If no DTCs retrieved, GO to Pinpoint Test C .

2. VISUAL INSPECTION CHART

2. Mechanical
4. Electrical

• Front door power window regulator damaged.
• Front window run damaged.
• Front door window glass out of window run.
• Front door window glass broken.

• Lighting control module.
• Driver door module.
• Circuits open/shorted.
• Loose, corroded connectors.
• Damaged window regulator control switch.
• Damaged window regulator electric drive.
• Power distribution box Fuse D 40 for heated back window concern; Circuit Breaker 14 (20A), Circuit Breaker F (30A) or window regulator safety relay for power window concern.
• Fuse junction panel Circuit Breaker 14 (20A), Fuses 6 (10A), 9 (5A), 15 (15A), Fuse 13 (10A), Fuse 4 (10A) or Circuit Breaker 12 (18A).
• Scratched grid.

1. If the inspection reveals obvious concerns that can be readily serviced, correct the concern before continuing with Inspection and Verification.
   

1. If the concern remains after the inspection, connect the Rotunda New Generation Star (NGS) Tester, 007-00500 or equivalent, to the data link connector (DLC) located beneath the instrument panel to perform DATA LINK DIAGNOSTICS test. If the NGS responds with NO RESPONSE/NOT EQUIPPED for the driver door module, go to Pinpoint Test A . If the NGS responds with NO RESPONSE/NOT EQUIPPED for lighting control module, go to Pinpoint Test B . If the DATA LINK DIAGNOSTICS test is passed for the driver door module and lighting control module, retrieve continuous DTCs and execute self test diagnostics for the driver door module and lighting control module to retrieve current DTCs.
   

1. If self test is passed and no DTCs are retrieved, go to Symptom Chart to continue diagnosis.
   

1. If DTCs are retrieved for the driver door module, go to the Driver Door Module (DDM) Diagnostic Trouble Code (DTC) Index to continue diagnosis. If DTCs are retrieved for the lighting control module, go to the Lighting Control Module (LCM) Diagnostic Trouble Code (DTC) Index to continue diagnostics.
   

1. If the driver door module cannot be accessed by the NGS tester, go to Pinpoint Test A . If the lighting control module cannot be accessed by the NGS, go to Pinpoint Test B .
   

Rotunda Service Bay Diagnostic System (SBDS®) 001-00001 may also be used to diagnose this system.
You'll need more then wiring diagrams ! A good scan tool for starters .
Youl

Enter this string in your web browser under the images search bar"wiring diagram for a 1988 buick century window switch"
and you also look at this web page:
http://ricksfreeautorepairadvice.com/window-goes-up-but-not-down-window-goes-down-but-not-up/

see the diagram and troubleshooting. and fix it. God bless you
test wires, connector, fuse, loose , dirty, bad contact, corrosion, faulty motor, switchs open or dirty or faulty

1985-1998 Oldsmobile Grand Am/Achieva/Calais/Skylark/Somerset
REMOVAL & INSTALLATION

Door Glass and (manual) Regulator

See Figure 1

Fig. 1: Common window attachment

SEE ILLUSTRATION #1 BELOW

1. Remove the door panel.
2. Remove the water deflector from the door.
Be careful not to tear the water deflector when removing it from the door.
The "water deflector" is also known as the "dew wiper"
3. Connect the power window switch/window regulator handle.
4. Lower window to full down position.

CAUTION
Use extreme caution when operating the window with the door panel removed. The window regulator can cause severe personal injury if body parts become entangled in the mechanism.
5. Remove the window run channel.
6. Move window to the half down position.
7. Remove the window retaining nuts.
8. While holding onto the window, lower the regulator to the full down position.
9. Remove the window by sliding it towards the rear and rotating the front of the window upward.

To install:
10. Position the new window in the door.
11. While holding onto window move regulator to half up position.
12. Install the nuts. Roll the window to the full up position.
13. Install the rear run channel.
14. Install the plastic water deflector. If necessary, secure with waterproof adhesive
15. Install the door trim panel.

Window Regulator

See Figures 2 and 3

Fig. 2: Location of the front door window regulator-1995 vehicle shown

SEE ILLUSTRATION #2 BELOW

Fig. 3: Exploded view of the rear door window regulator-1995 vehicle shown.

SEE ILLUSTRATION #3 BELOW

1. Remove the door panel.
2. Remove the plastic window deflector. Be careful not to tear the deflector when removing it from the door.
3. Remove the door window assembly.
4. Remove the bolts securing the regulator to the door.
5. Remove the nuts securing the upper regulator guide.
6. Using a 1/4 in. drill, drill out the regulator rivets.
7. If equipped with power windows, detach the electrical connector.
8. Remove the regulator through the large access hole in door.

To install.
9. Install the regulator to the door, and attach the electrical connector if equipped with power windows.
10. While holding the regulator to the inner door panel, insert the rivets, and secure them with a rivet tool.
11. Fasten the regulator bolts and upper guide nuts.
12. Install the door glass, and inside door plastic panel.
13. Install the inside door trim panel.
14. Install the plastic water deflector. If necessary, secure with waterproof adhesive.
15. Install the door trim panel.

Fig.1---------------------------------------------------------------------- Fig. 2



Fig. 3

Check for broken wires in the door jamb of the drivers door. You will have to **** the rubber boot which the wires pass through to gain access. This was a very common problem for those vehicles, and there is probably more than one wire broken.

I think that the ABS TRAC OFF light has more to do with the ABS sensors not giving reliable speed or movement information to the ABS Control Module. Harness connections or broken wires to the module can cause the same problem, or the hub assembly ($49 to $79 to $109 for the part) may have to be replaced to start with.

The driver door window switch not functioning correctly may be a bad or dirty switch which can be obtained from a salvage yard for a lower price than from the dealer. I would test the switch current before replacing, though, with a test light to ensure the wiring is not an issue with this circuit, as well.

Good luck on these repairs on the 2005 Buick Century.

Hi,
Hi!!

Here is a little information on how window regulator works. Also step by step instruccions on how to remove and install the window glass.

Door Glass & Regulator Power Windows
Diagnosis & Testing
When the rear window lockout feature is enabled, the circuit is open and no voltage is supplied to the rear window switches. When the feature is not enabled, the circuit is connected to battery positive voltage. If this circuit is shorted to ground when the lockout feature is not enabled, the PWR WDO circuit breaker may cycle continuously OFF/ON until, either the lockout switch is pressed to open the circuit, or the circuit breaker is permanently damaged. All windows may be partially or totally inoperative while the fault is present.
Inspect for aftermarket devices which could affect the operation of the system. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. Faulty electrical connections or wiring may be the cause of intermittent conditions.
Removal & Installation
Window Motor & Regulator

1. Position window approximately half way down in the door.
2. Remove the interior trim panel.
3. Remove the water deflector.
4. Tape the window to door frame to prevent it from moving.
5. Remove the three front door window regulator motor screws.
6. Disconnect the electrical connector from the window regulator motor.
7. Remove front side door window regulator motor.
8. To install, reverse removal procedure.

Window Switch
Front

1. Remove the front door pull cup screws and pull cup from the front door trim panel.
2. Disconnect the electrical connectors from the front door power window control switch.
3. Remove the front door window control switch using a small, flat-bladed tool at the side of the switch.
4. To install, reverse removal procedure.

Rear

1. Remove the rear door pull cup from the rear door trim panel.
2. Disconnect the electrical connectors from the power window control switch.
3. Remove the rear door window control switch from the pull cup using a small, flat-bladed tool at the side of the power window control switch to release the power window control switch retainer.
4. Remove the power window control switch from the rear door pull cup.
5. To install, reverse removal procedure.

There is no type of sensor in that system, however the problem could be a broken wire inside of the weather boot that runs between the door and the body of the vehicle. (The broken wire(s) will most likely be inside of the driver side door weather boot, but it could also be inside of the weather boot on the door that has the window problem)

If the window does go part of the way back up then most likely the window regulator assembly or the drive gear between the regulator assembly and the power window motor is damaged, and the door panel will have to be removed to inspect for the actual problem.

Here is a wiring diagram of a typical power window circuit for that year and vehicle to help assist you.

I need to instal a window regulator on the driver side, I need step by step to install it