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Home >> Buick >> 1997 >> Park Avenue Ultra >> Repair and Diagnosis >> Accessories & Equipment >> Headlights - Automatic Twilight Sentinel >> Diagnosis & Testing >> Headlight System Tests >> Diagnostic System Check

Diagnostic System Check

  1. Turn ignition off. Turn headlights off. All exterior lights should be off. If headlights are not off, see HEADLIGHTS DO NOT TURN OFF procedure.
  2. Turn parking lights on. All parking lights should be illuminated. If parking light(s) are not illuminated, locate and repair problem in exterior lighting system. See appropriate wiring diagram in EXTERIOR LIGHTS article.
  3. Turn low beam headlights on. Parking lights should remain lit. Both low beam headlights should be illuminated. If low beams do not operate as specified, see LOW BEAM HEADLIGHTS INOPERATIVE procedure.
  4. Turn high beam headlights on. Parking lights should remain lit. Headlights should switch from low beam to high beam. If high beams do not operate as specified, see HIGH BEAM HEADLIGHTS INOPERATIVE procedure.
  5. Turn low beam headlights on. Turn headlights off. Turn ignition switch to RUN position. Apply parking brake. Put gearshift lever in Drive. Expose ambient light sensor to sunlight or bright incandescent light. Both high beam headlights should illuminate at reduced intensity. All other exterior lights should be off. If headlights do not operate as specified, see DAYTIME RUNNING LIGHTS INOPERATIVE procedure.
  6. Put gearshift lever in Park. Turn twilight sentinel on, with twilight sentinel delay in MIN position. Cover ambient light sensor. Both low beam headlights should illuminate at full intensity and all parking lights should turn on within 30 seconds. If headlights do not operate as specified, see TWILIGHT SENTINEL INOPERATIVE procedure.
  7. Put twilight sentinel delay in MAX position. Turn ignition off. All exterior lights should turn off after about 3 minutes. If exterior lights do not operate as specified, see TWILIGHT SENTINEL INOPERATIVE procedure.
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