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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 861 (AIR CONDITIONING SYSTEM - DIAGNOSIS)CIRCUIT INSPECTIONDTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUITINSPECTION 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 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

In case of using the LEXUS hand- held tester, start the inspection step 1 and in case of not using the LEXUS hand-held tester, start from step  2.

  1. Check room temp, sensor using LEXUS hand- held tester. 

    PREPARATION: 

    Connect the LEXUS hand-held tester to the DLC3.

    CHECK: 

    Check the room temp, sensor using DATA LIST.

    1. OK : Check and replace A/C ECU. 
    2. NG : Go to next step. 
  2. Check voltage between terminals TR and SG-2 of A/C ECU connector. 

    PREPARATION: 

    Remove A/C ECU with connectors still connected.

    CHECK: 

    1. Turn ignition switch to ON.
    2. Measure voltage between terminals TR and SG-2 of A/C ECU connector at each temperature.

    OK: 

    Voltage : 

    at 25°C (77°F) : 1.8 - 2.2 V 

    at 40°C (104°F) : 1.2 - 1.6 V 

    HINT:

    As the temperature increases, the voltage decreases.

    Fig 1: Identifying Voltage Between Terminals TR And Sg-2 Of A/C ECU Connector
    G03376721Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Go to step 3. 
    2. OK : Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). However, if DTC B1411/11 is displayed, check and replace A/C ECU. 
  3. Check room temperature sensor. 

    PREPARATION: 

    Disconnect room temperature sensor connector.

    CHECK: 

    Measure resistance between terminals 1 and 2 of room temperature sensor connector at each temperature.

    OK: 

    Resistance : 

    at 25°C (77°F) : 1.65 - 1.75 kΩ 

    at 50°C (122°F) : 0.55 - 0.65 kΩ 

    HINT:

    As the temperature increases, the resistance decreases.

    Fig 2: Identifying Room Temperature Sensor
    G03376722Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Replace room temperature sensor. 
    2. OK : Go to next step. 
  4. Check harness and connector between A/C ECU and room temperature sensor (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG : Repair or replace harness or connector. 
    2. OK : Check and replace A/C ECU. 
RENDER: 1.0x

NO RELATED

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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.