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Home >> Toyota >> 1999 >> Camry CE, Standard >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System W/Traction Control System >> Diagnostic Tests >> DTC 49: Stoplight Switch >> Diagnostic Procedure

Diagnostic Procedure

  1. Depress brake pedal and ensure brakelights illuminate. If brakelights illuminate, go to next step. If brakelights do not illuminate, check stoplight switch adjustment. See STOPLIGHT SWITCH  under ADJUSTMENTS.
  2. Turn ignition off. Remove ABS/TRAC ECU. Do not disconnect electrical connectors. Measure voltage between ground and terminal STP at ABS/TRAC ECU harness connector when brake pedal is depressed. See Figure. If voltage is 8-14 volts, stoplight switch circuit is okay at this time. If voltage is not 8-14 volts, go to next step.
  3. Check for open circuit in wiring harness between stoplight switch and ABS/TRAC ECU. Repair as necessary. See WIRING DIAGRAMS . If wiring harness is okay, substitute a known-good ABS/TRAC ECU and retest system.
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