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Home >> Toyota >> 2000 >> RAV4 Base, AWD, Standard >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake 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. If stoplight switch adjustment is okay, locate and repair fault in stoplight circuit. See WIRING DIAGRAMS .
  2. Turn ignition off. Remove ABS ECU. Do not disconnect electrical connectors. Measure voltage between ground and terminal STP at ABS 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 ECU. Repair as necessary. See WIRING DIAGRAMS . If wiring harness is okay, replace ABS ECU.
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