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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 226 (ANTI-LOCK BRAKE SYSTEM)DIAGNOSTIC TESTSDTC C1249/ 49: STOPLIGHT SWITCHDIAGNOSTIC PROCEDURE
2004 Toyota Matrix XR, FWD, Standard

Diagnostic Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2003 Toyota Tundra, 2002 Toyota Tundra, and 2001 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
  1. Depress brake pedal and ensure stoplights illuminate. If stoplights illuminate, go to next step. If stoplights do not illuminate, check stoplight switch adjustment. If stoplight switch adjustment is okay, locate and repair fault in stoplight circuit. See WIRING DIAGRAMS .
  2. Remove ABS ECU. Measure voltage between terminal STP of ABS ECU wiring harness side connector and body ground when brake pedal is depressed. If voltage is 8-14 volts, replace ABS ECU. If voltage is not 8-14 volts, check for open circuit in wiring harness between stoplight switch and ABS ECU. Repair as necessary. See WIRING DIAGRAMS .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.