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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 332 (Disc Brakes) >> Diagnostic Tests >> DTC C1247: Brake Fluid Switch Input Grounded >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. If hydraulic brake system diagnostic system check has been performed, go to next step. If hydraulic brake system diagnostic system check has not been performed, see HYDRAULIC BRAKE SYSTEM DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Inspect brake fluid level. If brake fluid level is below MIN mark on master cylinder, repair leak in brake system. If brake fluid level is above MIN mark on master cylinder, go to next step.
  3. Turn ignition switch to OFF. Connect scan tool to Data Link Connector (DLC). Using scan tool observe BRAKE FLUID LEVEL parameter in Instrument Panel Cluster (IPC) data list. If scan tool indicates parameter is OK, system is functioning properly at this time. Check brake fluid level sensor connector for poor or intermittent connections. If scan tool indicates parameter is not okay, go to next step.
  4. Turn ignition switch to OFF. Disconnect brake fluid level switch. Turn ignition switch to ON. Using scan tool, observe BRAKE FLUID LEVEL parameter in IPC data list. If scan tool indicates parameter is OK, go to step  6. If scan tool indicates parameter is not OK, go to next step.
  5. Check purple wire between brake fluid level switch connector and IPC connector C1 terminal B4 for short to ground. See Fig 1. Repair wiring as necessary, then go to step  10. If no problem is found, go to step  7.
  6. Check brake fluid level switch connector for poor connection or corroded terminals. Repair connection as necessary, then go to step  10. If no problem is found, go to step  8.
  7. Check IPC connector for poor connections or corroded terminals. Repair connection as necessary, then go to step  10. If no problem is found, go to step  9.
  8. Replace brake fluid level switch. When repair is complete, go to step  10.
  9. Replace IPC. See INSTRUMENT PANEL CLUSTER under REMOVAL & INSTALLATION in appropriate ANALOG INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. When repair is complete, go to next step.
  10. Using scan tool, clear DTC. Scan for IPC/EBCM DTCs, If DTC C1247 resets, go to step  2. If DTC does not reset, repair is complete.
Fig 1: Identifying Instrument Cluster Connector Terminals
G00011672Courtesy of GENERAL MOTORS CORP.
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