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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P1574: Stoplight Switch Circuit ("Y" Body) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
  2. Using scan tool, monitor stop/brakelight switch. If scan tool display indicates RELEASED go to next step. If scan tool display does not indicate RELEASED, go to step  7.
  3. Depress brake pedal about halfway. If scan tool display indicates APPLIED, see DIAGNOSTIC AIDS . If scan tool display does not indicate APPLIED, go to next step.
  4. Check stop/brakelight fuse. If fuse is blown, go to step  11. If fuse is okay, go to next step.
  5. Disconnect stop/brakelight switch harness connector. Using a test light connected to ground, probe stop/brakelight feed circuit at harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  12.
  6. Jumper stop/brakelight circuit together at harness connector. Observe scan tool. If scan tool display indicates APPLIED, go to step  8. If scan tool display does not indicate APPLIED, go to step  10.
  7. Disconnect stop/brakelight switch harness connector. Observe scan tool. If scan tool display indicates RELEASED, go to next step. If scan tool display does not indicate RELEASED, go to step  9.
  8. Check stop/brakelight switch adjustment. Adjust if necessary. After adjusting stop/brakelight switch, go to step  15. If stop/brakelight switch does not need adjustment, go to step  13.
  9. Turn ignition off. Disconnect TAC module harness connector containing stop/brakelight circuit. Check for short in battery feed circuit to stop/brakelight circuit between switch and TAC module. Repair as necessary. After repairs, go to step  15. If circuit is okay, go to step  14.
  10. Turn ignition off. Disconnect TAC module harness connector containing stop/brakelight circuit. Check for open in circuit between stop/brakelight switch and TAC module. Repair as necessary. After repairs, go to step  15. If circuit is okay, go to step  14.
  11. Repair short to ground in stop/brakelight switch signal circuit. After repairs, go to step  15.
  12. Repair open between stop/brakelight fuse and switch. After repairs, go to step  15.
  13. Replace stop/brakelight switch. After replacing switch, go to step  15.
  14. Replace TAC module. After replacing module, go to next step.
  15. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step  2.
  16. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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