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Home >> Pontiac >> 2001 >> Aztek Base, AWD >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System With Traction Control System - BOSCH 5.3 >> Diagnostic Tests >> DTC C0161: STOPLAMP Switch Circuit Failure

DTC C0161: STOPLAMP Switch Circuit Failure

  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
  2. Press brake pedal. Using scan tool, observe Brake Switch Status parameter in ABS data list. If Brake Switch Status parameter displays Active, go to step  4. If Brake Switch Status parameter does not display Active, go to next step.
  3. Test stoplamp switch connector terminal "B" (White wire) for an open. Repair circuit as necessary, then go to step  15. If condition was not found, go to step  11.
  4. Press brake pedal. If all stoplamps are off, go to next step. If all stoplamps are on, go to step  7.
  5. Test stoplamp switch connector terminal "A" (Orange wire) for an open or high resistance. Repair circuit(s) as necessary, then go to step  15. If condition was not found, go to next step.
  6. Test stoplamp ground circuits for an open or high resistance. See WIRING DIAGRAMS . Repair circuit(s) as necessary, then go to step  15. If condition was not found, see INTERMITTENT & POOR CONNECTIONS  under DIAGNOSIS & TESTING.
  7. Press brake pedal. Using scan tool, observe Brake Switch Status parameters. If Brake Switch Status parameter changes state, see INTERMITTENT & POOR CONNECTIONS  under DIAGNOSIS & TESTING. If Brake Switch Status parameter does not change state, go to next step.
  8. Turn ignition off. Inspect stoplamp switch. Adjust and/or calibrate switch as necessary, then go to step  15. If condition was not found, go to next step.
  9. Turn ignition switch off. Disconnect stoplamp switch connector. Turn ignition on, with engine off. Using scan tool, observe Brake Switch Status parameter. If scan tool displays Released, go to step  11. If scan tool does not display Released, go to next step.
  10. Check stoplamp switch connector terminal "B" (White wire) for a short to voltage. Repair circuit as necessary, then go to step  15. If condition was not found, go to step  12.
  11. Inspect for poor connections at stoplamp switch harness connector. Repair as necessary, then go to step  15. If condition was not found, go to step  13.
  12. Inspect for poor connections at EBCM harness connector. Repair as necessary, then go to step  15. If condition was not found, go to step  14.
  13. Replace stoplamp switch. Go to step  15.
  14. Replace EBCM. See ELECTRONIC BRAKE CONTROL MODULE & BRAKE PRESSURE MODULATOR VALVE ASSEMBLY  under REMOVAL & INSTALLATION. Go to next step.
  15. Using scan tool, clear DTCs. Operate vehicle to verify repair. If DTC resets, go to step  2. If DTC does not reset, system is okay.
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