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Home › Chevrolet › 1998 › Corvette 2D Convertible, Standard › Repair and Diagnosis › Engine Performance › System › Engine- Tests W/Codes › Diagnostic Trouble Codes › DTC P1574 - Stoplight Control Circuit › Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Start engine. Using scan tool, monitor brakelight (STOP LAMP) switch. Depress brake pedal about half-way down. If scan tool displays APPLIED, see DIAGNOSTIC AIDS. If scan tool does not display APPLIED, go to next step.
  3. Check brakelight switch adjustment. Adjust if necessary. After adjustment, go to step 9). If adjustment is okay, go to next step.
  4. Turn engine off. Disconnect brakelight switch connector. Turn ignition on. If scan tool displays APPLIED, go to next step. If scan tool does not display APPLIED, go to step 7).
  5. Turn ignition off. Disconnect PCM connector. Turn ignition on. Install Brown connector from Connector Kit (J 35616-A) into brakelight switch signal circuit. Using a DVOM, check voltage on brakelight switch signal circuit. If voltage is greater than .5 volt, go to next step. If voltage is not greater than .5 volt, go to step 8).
  6. Repair short to voltage in brakelight switch signal circuit. After repairs, go to step 9).
  7. Replace brakelight switch. After replacing switch, go to step 9).
  8. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  9. 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).
  10. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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