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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 623 (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. 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 engine room J/B and driver side J/B.
    2. Check that the continuity exists of HTR fuse.
    1. NG: REPLACE FUSE 
    2. OK: Go to next step. 
  2. INSPECT HEATER BLOWER MOTOR RELAY ASSY 
    1. Measure the resistance according to the value(s) in TESTER CONNECTED CONDITION SPECIFICATION  .

      Standard: 

      TESTER CONNECTED CONDITION SPECIFICATION

      Tester connected Condition Specified condition
      3-5 Always 10 kΩ or higher
      3-5 When battery voltage applied to terminals 1 and 2 Below 1.0 Ω
      3-4 Always Below 1.0 Ω
      3-4 When battery voltage applied to terminals 1 and 2 10kΩ or higher
      Fig 1: Inspecting Heater Blower Motor Relay Assy
      G02894818Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE HEATER BLOWER MOTOR RELAY ASSY 
    2. OK: Go to next step. 
  3. CHECK HARNESS AND CONNECTOR (BETWEEN HEATER CONTROL HOUSING SUB-ASSY AND BATTERY) 
    1. Remove the A/C amplifier with assy connectors still connected.
    2. Measure voltage according to the value(s) in TESTER CONNECTED CONDITION SPECIFICATION  .

      Standard: 

      TESTER CONNECTED CONDITION SPECIFICATION

      Tester connected Condition Specified condition
      A13-32 (HR) - Body ground Ignition switch OFF 0 V
      A13-32 (HR) - Body ground Ignition switch ON (Blower switch ON) Below 1.0 V
      A13-32 (HR) - Body ground Ignition switch ON (Blower switch OFF) 10 to 14 V
      Fig 2: Checking Harness & Connector (Between Heater Control Housing Sub-Assy & Battery)
      G02894819Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: Go to next step. 
  4. CHECK HARNESS AND CONNECTOR (BETWEEN BLOWER W/FAN MOTOR, BLOWER MOTOR CONTROL AND BATTERY) 
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE 
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.