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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 430 (HYBRID VEHICLE CONTROL SYSTEM - DIAGNOSTICS)CIRCUIT INSPECTIONDTC P1520: STOP LIGHT SWITCH (CRUISE CONTROL SYSTEM) MALFUNCTIONCIRCUIT DESCRIPTION - DTC P1520 - INFORMATION CODE 115INSPECTION PROCEDURE
2004 Toyota Matrix XR, FWD, Standard

Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure
WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. Is DTC of brake ECU being output? 
    1. YES  : Check DTC of brake ECU. See RETRIEVING DIAGNOSTIC TROUBLE CODES .
    2. NO:  Go to  2.
  2. Check voltage between terminal 2, 3 of stop light switch and body ground. 
    1. NG:  Repair or replace wire harness or connector.
    2. OK:  Go to  3.
  3. Check for open and short in wire harness between stop light switch and terminals STP, ST1- of HV ECU  . See . HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION .
    1. NG:  Repair or replace wire harness.
    2. OK:  Check and replace stop light switch. See STOP LIGHT SYSTEM .
RENDER: 1.0x

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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.