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Power Windows Buick Regal III

Windows 3 illustrations ~1455 words

DESCRIPTION & OPERATION

Power window system uses a permanent magnet motor to operate each window. Motor operation is controlled by a master switch assembly alone or in combination with individual window switches. Window is lifted or lowered depending on polarity of current applied to window motor.

When ignition switch is in RUN position, power for window system is supplied to master switch assembly through fuse block 30-amp circuit breaker. When any master switch is operated, power is applied through related window switch to motor, driving drive motor in either direction to either raise or lower window. Each motor is protected by an internal circuit breaker which will reset after switch is released (voltage removed).

SYSTEM CHECK

Note. In text, master switch refers to left hand front window switch (4 Door) or left hand master switch assembly (2 Door).

  1. Operate each window UP and DN from the master switch. Each window should operate quietly and smoothly, without sticking.
  2. Operate each window from its individual window switch. Each window should operate quietly and smoothly, without sticking.
  3. Momentarily press left hand front switch DN past the first detent. Window should continue to fully down position.
  4. Lock out switch in LOCK position (4 Door), windows should operate from left hand master switch assembly and not from their individual switches.
  5. Lock out switch in OFF position (4 Door), all windows should operate normally from their individual switches.
  6. If any of the above steps are not as specified, see «SYMPTOM DIAGNOSIS»(/buick/regal/iii-1988-1997/remont/windows/#power-windows__symptom-diagnosis) in this article.

SYMPTOM DIAGNOSIS

Note. If your symptom does not appear below, perform all tests under TESTING .

Express Down Feature Inoperative

Replace master switch assembly.

Go to TEST A: WINDOW POWER & GROUND TEST under TESTING.

Go to TEST A: WINDOW POWER & GROUND TEST under TESTING.

Left Hand Front Window Does Not Operate

Go to TEST B: MASTER SWITCH TEST under TESTING.

Right Hand Front, Left Hand Rear, or Right Hand Rear Window Does Not Operate Master Switch

Go to TEST B: MASTER SWITCH TEST under TESTING.

All Windows Operate From Master Switch, But Do Not Operate From Its Individual Switch

Go to TEST C: WINDOW SWITCH TEST under TESTING.

Lock Out Function Does Not Work But Windows Operate Normally Otherwise (4 Door)

Go to TEST E: LOCK OUT SWITCH TEST under TESTING.

TESTING

Note. To identify specific circuits, see WIRING DIAGRAMS .

TEST A: WINDOW POWER & GROUND TEST

  1. With ignition switch in RUN position, connect test lamp at the following master switch connector wires. Leave master switch connector connected.
  2. Connect test lamp between Pink wire and ground. The test lamp should light. If not, check Pink wire (Circuit 76) for an open.
  3. Connect test lamp between Pink and Black wires. The test lamp should light. If not, check Black wire (Circuit 150) for an open.
  4. If results above are OK, go to «TEST B: MASTER SWITCH TEST»(/buick/regal/iii-1988-1997/remont/windows/#power-windows__test-b-master-switch-test) below.

TEST B: MASTER SWITCH TEST

  1. With ignition switch in RUN position, connect test lamp at the following master switch connector wires. Leave master switch connector connected. Operate left hand front window UP and DN from master switch.
  2. Connect test lamp between Dark Blue and Brown wires. The test lamp should light. If not, check for a poor connection. If OK, replace master switch.
  3. Operate right hand front window UP and DN from master switch. If all results are correct, and problem is with left hand front window, go to «TEST D: WINDOW MOTOR TEST»(/buick/regal/iii-1988-1997/remont/windows/#power-windows__test-d-window-motor-test) . For all other windows, go to «TEST C: WINDOW SWITCH TEST»(/buick/regal/iii-1988-1997/remont/windows/#power-windows__test-c-window-switch-test) .
  4. Connect test lamp between Dark Blue/White and Tan wires. The test lamp should light. If not, check for a poor connection. If OK, replace master switch.
  5. Operate left hand rear window UP and DN from master switch (if equipped). If all results are correct, and problem is with left hand front window, go to «TEST D: WINDOW MOTOR TEST»(/buick/regal/iii-1988-1997/remont/windows/#power-windows__test-d-window-motor-test) . For all other windows, go to «TEST C: WINDOW SWITCH TEST»(/buick/regal/iii-1988-1997/remont/windows/#power-windows__test-c-window-switch-test) .
  6. Connect test lamp between Dark Green and Purple wires. The test lamp should light. If not, check for a poor connection. If OK, replace master switch.
  7. Operate right hand rear window UP and DN from master switch (if equipped). If all results are correct, and problem is with left hand front window, go to «TEST D: WINDOW MOTOR TEST»(/buick/regal/iii-1988-1997/remont/windows/#power-windows__test-d-window-motor-test) . For all other windows, go to «TEST C: WINDOW SWITCH TEST»(/buick/regal/iii-1988-1997/remont/windows/#power-windows__test-c-window-switch-test) .
  8. Connect test lamp between Purple/White and Light Green wires. The test lamp should light. If not, check for a poor connection. If OK, replace master switch.

TEST C: WINDOW SWITCH TEST

  1. With ignition switch in RUN position, connect test lamp at the suspect window switch connector wires. Leave window switch connector disconnected.
  2. Connect test lamp between Pink wire and ground. The test lamp should light. If not, for Coupe models go to step 3 and for Sedan models go to step 4.
  3. Check Pink wire (Circuit 76) for an open or short to ground.
  4. Check Pink wire (Circuit 76) for an open or short to ground. If OK, go to «TEST E: LOCK OUT SWITCH TEST»(/buick/regal/iii-1988-1997/remont/windows/#power-windows__test-e-lock-out-switch-test) .
  5. On all models operate associated switch in master switch UP and DN. If results are correct, go to «TEST D: WINDOW MOTOR TEST»(/buick/regal/iii-1988-1997/remont/windows/#power-windows__test-d-window-motor-test) .
  6. Connect test lamp between right hand front window switch connector terminals B and E (4-Door) or L and K (2-Door). The test lamp should light. If not, check wires from master switch for an open or short to ground.
  7. Connect test lamp between rear window switches connector terminals B and E on 4-Door models only.. The test lamp should light. If not, check wires from master switch for an open or short to ground.

TEST D: WINDOW MOTOR TEST

  1. With ignition switch in RUN position, connect test lamp at the suspect window motor connector wires. Leave window motor connector disconnected. Operate associated switch in master switch UP and DN.
  2. Connect test lamp between Dark Blue and Brown wires. The test lamp should light. If not, check Dark Blue and Brown wires for an open or short to ground.
  3. Operate associated window switch UP and DN. If results are correct, check for a poor connection. If OK, replace window motor.
  4. Connect test lamp between Dark Blue and Brown wires. The test lamp should light. If not, replace suspect window switch.

TEST E: LOCK OUT SWITCH TEST

  1. With ignition switch in RUN position and lock out switch OFF, connect test lamp at the following master switch connector wires. Leave master switch connector connected.
  2. Connect test lamp between C2/A (Pink wire) and ground. The test lamp should light. If not, check for a poor connection. If OK, replace master switch.
  3. Lock the lock out switch. Connect test lamp between C2/A (Pink wire) and ground. The test lamp should not light. If lamp lights, check Pink wire (Circuit 76) for a short to battery. If OK, check for a poor connection. If OK, replace master switch.

TEST F: CHECK FOR OPEN CIRCUIT

  1. Disconnect suspect individual switch connector. Ensure passenger window lockout switch is off. With ignition switch in RUN position, connect a test light between suspect window switch Dark Blue wire (from master switch) connector terminal and ground.
  2. If light comes on, replace suspect individual switch. If light does not comes on, check for open in Dark Blue wire between master switch and suspect switch. If wire is okay, replace master switch.

Removal

  1. Raise window to full up position and secure in place. Remove door panel covering and insulator. Window may be disengaged from regulator and removed from vehicle. If motor is held to door and regulator with nuts and bolts, remove nuts and bolts as necessary.
  2. If motor is held to door and regulator with rivets, punch out center of regulator-to-door rivets and drill out rivets using a 1/4" drill bit. Disconnect window from regulator.
  3. Move regulator and motor assembly rearward to access motor-to-regulator rivets. Punch out center of motor-to-regulator rivets and drill out rivets using a 3/16" drill bit. On all types, disconnect electrical connector and remove motor from door.

Installation

To install, reverse removal procedure. On models attached with rivets, use Rivet Installer (J-34940) with 3/16" rivets for motor-to-regulator attachment and 1/4" rivets for regulator-to-door attachment.

Removal & Installation

Using a thin-blade screwdriver, probe between switch and door panel for spring clip (if equipped). Press down on clip to release switch and pry outward. Disconnect electrical connector and remove switch. To install, reverse removal procedure.

Scheme 1

Scheme 1: WIRING DIAGRAMS
Scheme 1: WIRING DIAGRAMS

Scheme 2

Scheme 2
Scheme 2

Scheme 3

Scheme 3
Scheme 3