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Home >> Lexus >> 1997 >> SC 300 Standard >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System - Without Traction Control >> Diagnostic Tests >> DTC 49: Stop Light Switch Circuit >> Diagnosis & Repair

Diagnosis & Repair

  1. Ensure stoplight is functioning properly. See STOPLIGHT SWITCH CIRCUIT . Repair as necessary. If stoplight is functioning properly, go to next step.
  2. Remove ABS ECU but do not disconnect connector. See ABS ECU  under REMOVAL & INSTALLATION. Depress brake pedal. Ensure ignition switch is in LOCK position. Backprobing, measure voltage between ABS ECU A24 connector terminal No. 5 (Green/White wire) and ground. If voltage is not 8-14 volts, go to next step. If voltage is 8-14 volts, check ABS actuator using Actuator Checker (SST 09990-00150). See ABS ACTUATOR CHECK . If ABS actuator is not okay, check hydraulic circuit for leakage.
  3. Check for open in Green/White wire between ABS ECU A24 connector terminal No. 5 and stoplight switch. Repair as necessary. If wire is okay replace ABS ECU.
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