2002 Buick Regal LSFACTORY OEM SERVICE PROCEDURE

Test D: Lock-Out Function Inoperative

NOTE: Reviewing system description and operation information will help determine if condition described by customer is normal operation, and may help determine correct symptom diagnostic procedure when a malfunction exists.
  1. If power window system description and operation has been reviewed, go to next step. If description and operation has not been reviewed, see POWER WINDOW SYSTEM  under DESCRIPTION & OPERATION.
  2. Operate power windows lock-out function. If lock-out function does not operate properly, go to next step. If lock-out function operates properly, go to DIAGNOSING INTERMITTENTS  .
    3. NOTE: Driver door window switch may be referred to as left front window switch, master window switch or master switch.
  3. Disconnect master switch harness connectors. Turn ignition switch to ON position. Connect a test light between ground and master switch C2 5-pin harness connector terminal "A" (Dark Blue wire). See Figure . If test light illuminates, go to next step. If test light does not illuminate, go to step  5 .
  4. Repair short to voltage in Dark Blue wire between master switch and other window switches. See WIRING DIAGRAMS  . After repair, go to step  7 .
  5. Check for poor connections at master switch connectors. If poor connections are not found, go to next step. If poor connections are found, repair as necessary. After repair, go to step  7 .
  6. Replace master switch. See WINDOW SWITCH  under REMOVAL & INSTALLATION. After repair, go to next step.
  7. Operate system to verify repairs. If system does not operate properly, go to step  2 . If system operates properly, system is okay.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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