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Home >> Saturn >> 2000 >> LS Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0719: Brake Switch Circuit Low >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, monitor brake switch status while depressing and releasing brake pedal. If scan tool indicates the correct status (Applied/Released), problem is intermittent. See DIAGNOSTIC AIDS . If scan tool does not indicate the correct status (APPLIED/RELEASED), go to next step.
  3. Check BRAKE/PARK LOCK fuse (10-amp) located in underhood fuse block. Replace as necessary. Disconnect stoplight switch harness connector. Using fused jumper wire, connect jumper to stoplight switch harness connector terminals. Observe scan tool while connecting and disconnecting jumper wire to stoplight switch harness connector. If scan tool does not indicate the correct status (Applied/Released), go to next step. If scan tool indicates the correct status (Applied/Released), check for terminal tightness at harness connector. Repair as necessary. If terminals are okay, replace stoplight switch.
  4. Check fuse in jumper wire. If fuse is blown, repair short to ground in circuit (Light Blue wire) between stoplight switch and left instrument panel fuse block or to components attached to this circuit. See WIRING DIAGRAMS article. If fuse is okay, go to next step.
  5. Using a DVOM, check voltage on stoplight switch harness connector terminal No. 1 (Orange wire ) circuit. If voltage is not present, repair open in Orange wire circuit. If voltage is present, check for open in stoplight switch harness connector terminal No. 2 (Light Blue wire) circuit. Repair as necessary. If circuit is okay, check for terminal tightness. Repair as necessary. If terminals are okay, replace PCM.
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