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Diagnostic Procedure

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1998 GMC Savana Special, 1998 GMC Savana Camper Special, 1998 GMC Savana, 1998 Chevrolet RV Cutaway, and 1998 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect scan tool to DLC. Turn ignition switch to ON position. DO NOT start engine. Using scan tool, record freeze frame and failure records for reference. Data will be lost when DTCs are cleared later in this test.
  2. Select "TCC Brake switch" on scan tool. Disconnect brake switch connector. If brake switch status on scan tool changed from closed to open, replace brake switch, then go to next step. If brake switch status on scan tool did not change from closed to open, check for short to voltage in brake switch input circuit. Repair as necessary, then go to next step. If circuit is okay, replace VCM, then go to next step.
  3. After repair is complete, select DTC on scan tool. Select "Clear Info" function. Select "Specific DTC" and enter DTC "P0724". On diesel engines, select "TCC Brake Switch" on scan tool. Depress brake pedal. Ensure brake switch status changes as pedal is depressed. On gasoline engines, operate vehicle and ensure VCM sees brake switch closed for more than 3 seconds a total of 5 consecutive times. If DTC P0724 is not present, repair is complete. If DTC P0724 is still present, repeat test.
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