1997 Buick Century CustomFACTORY OEM SERVICE PROCEDURE

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  1. Turn ignition switch to RUN position. Using a test light, backprobe between ground and Yellow wire (Brown wire on Cutlass Supreme) at master switch connector. If test light is on, go to next step. If test light is off, repair poor connection or open power circuit between master switch and power window circuit breaker in instrument panel fuse block. See WIRING DIAGRAMS  . Recheck system operation.
  2. Using a test light, backprobe between Black wire and Yellow wire (Brown wire on Cutlass Supreme) at master switch connector. If test light is on, check for poor connection at master switch. Repair as necessary and recheck system operation. If connection is okay, replace master switch and recheck system operation. If test light is off, repair open circuit in Black wire between master switch and ground. Recheck system operation.
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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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