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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 692 (AIR CONDITIONING SYSTEM DIAGNOSTICS)HEATER RELAY 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 2004 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUSE (HTR) 
    1. Remove the HTR fuse from the driver side J/B.
    2. Measure the resistance according to the value(s) in HTR FUSE RESISTANCE  .

      Standard: 

      HTR FUSE RESISTANCE

      Tester item Condition Specified condition
      HTR fuse (10 A) Always Below 1 Ω
    1. NG: CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED FAILURE FUSE 
    2. OK: Go to Next Step. 
  2. CHECK FUSE (HTR) 
    1. Remove the HTR fuse from the engine room J/B.
    2. Measure the resistance according to the value(s) in HTR FUSE RESISTANCE  .

      Standard: 

      HTR FUSE RESISTANCE

      Tester item Condition Specified condition
      HTR fuse (50 A) Always Below 1 Ω
    1. NG: CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED FAILURE FUSE 
    2. OK: INSPECT HEATER RELAY 
  3. INSPECT HEATER RELAY 
    1. Measure the resistance according to the value(s) in HEATER RELAY RESISTANCE  .

      Standard: 

      HEATER RELAY RESISTANCE

      Terminal No. Condition Specified condition
      3 - 5 Always 10 kΩ or higher
      3 - 5 When battery voltage applied to terminals 1 and 2 Below 1 Ω
      Fig 1: Inspecting Heater Relay
      G03036802Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE HEATER RELAY 
    2. OK: Go to Next Step. 
  4. INSPECT AIR CONDITIONING AMPLIFIER 
    1. Measure the voltage according to the value(s) in Fig 2 .

      Standard: 

      Fig 2: Inspecting Air Conditioning Amplifier (1 Of 2)
      G03036803Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.