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Code 33: BRAKELIGHT Switch Circuit

NOTE: Code 33 is output if an open circuit is detected when brakelight switch is on for 15 minutes or more. Code will also be output if a short circuit is detected.
  1. Check if brakelights are functioning correctly. If brakelights function correctly, go to next step. If brakelights do not function correctly, check brakelight circuit and repair as needed.
  2. Ensure ignition is off. Disconnect ABS ECU harness connector C-64. Using DVOM, measure voltage between terminal No. 4 and ground while depressing brake pedal. If battery voltage is not present, repair or replace wiring harness between brakelight switch and ECU. If battery voltage is present, brakelight switch circuit is okay. Replace faulty ECU and retest.
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