Question about 1991 Buick Century
Replaced switch, still doesn't control windows. Rear and passenger windows work individually. Drivers window does not work.
Motor which runs when u press the switch has loosened connections or is not functioning
Get it checked
Posted on Jun 07, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
Passenger Front Door Module (PDM)
LH Rear Door Module (LRDM)
RH Rear Door Module (RRDM)
Driver Door Switch Assembly (DDSA)
RH Front Power Window Switch
LH Rear Power Window Switch
RH Rear Power Window Switch
LH Front Power Window Motor
RH Front Power Window Motor
LH Rear Power Window Motor
RH Rear Power Window Motor
Class 2 serial data circuit
Power door serial data circuit
PWR WDO 30 Amp Circuit Breaker
DRVMDL Fuse (10 amp)
Driver Door Switch Assembly and Driver Door Module logic, Driver Door Module internal driver operation
PASS MDL Fuse (10 amp)
Front Passenger Door Module logic and internal driver operation
RRDR MDL Fuse (10 amp)
Left Rear Door Module and Right Rear Door Module logic and internal driver operation
Do you know about computer controlled power windows ?
Power Windows Operation
The vehicle is equipped with power windows controlled by the door modules. Each passenger door window can be operated, either from a switch built into the driver door switch assembly (DDSA), or from a switch mounted locally to its associated door. The driver door window can be operated only from the driver door window switch built into the DDSA.
When a window is operated from the DDSA, the DDSA interprets the window switch signal as a specific window switch request and sends the information to the driver door module (DDM) via the power door serial data circuit. The DDM examines the request and checks to see if it has received any class 2 serial data messages from any of the other vehicle modules (i.e. ignition switch position) prohibiting the movement of the window. If the window being operated is the driver door window, and if no prohibitive class 2 messages have been received, the DDM then applies voltage and ground to the driver door window motor to move the window glass as requested. If the window being operated is a passenger door window, and no prohibitive class 2 messages have been received, the DDM sends the request, via the power door serial data circuit, to the appropriate passenger door module. The passenger door module then applies voltage and ground to the passenger door window motor to move the window glass as requested.
When a passenger door window is operated from the power window switch mounted locally to its associated door, the passenger door module first checks to see if the DDM has received any prohibitive class 2 serial data messages. If there are no prohibitive messages, the passenger door module powers the associated passenger door window motor.
Both front door windows have the express down feature. This allows the front door windows to be fully opened by momentarily pulling the appropriate window switch lever to the second detente and then releasing.
Oct 30, 2016 | Buick Cars & Trucks
Front Passenger window switch
Left Rear window switch
Right Rear window switch
Window regulator motors in each of the doors
PWR WINDOWS PWR SUNROOF Circuit Breaker 30A
When the ignition switch is in the RUN or ACCY position, or Retained Accessory Power (RAP) is enabled and the lockout switch is disengaged, battery positive voltage will be available at the passenger window switches. When an individual window switch is pressed in the down position, battery positive voltage is applied to the window regulator motor causing that window to open. When the individual window switch is pressed in the up position, voltage is applied to the window regulator motor in the opposite direction causing that window to close. The return path to ground is supplied through the inactive control circuit being normally grounded through the driver window switch.
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