Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 731 (AIR CONDITIONING SYSTEM - DIAGNOSIS)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 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE (HTR)
1. Remove the HTR fuse from the driver side J/B.
2. Check that the continuity exists of HTR fuse.
NG: REPLACE FUSE

OK: Go to next step.
INSPECT HEATER BLOWER MOTOR RELAY ASSY
1. Check that the continuity exists between each pair of terminals of heater blower motor relay assy, as shown in the chart.
  
  Fig 1: Checking Continuity Exists Between Each Pair Of Terminals Of Heater Blower Motor Relay Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard
  
  Fig 2: Continuity Results Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery voltage between terminals 1 and 2.
3. Check continuity each pair of terminals, as shown the chart.
  Standard
  
  Fig 3: Continuity Results Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE HEATER BLOWER MOTOR RELAY ASSY

OK: Go to next step.
CHECK HARNESS AND CONNECTOR(BETWEEN HEATER CONTROL HOUSING SUB-ASSY AND BATTERY)
1. Remove the A/C amplifier with connector.
2. Measure voltage between terminal HR of A/C amplifier and body ground when ignition switch is ON and OFF.
  
  Fig 4: Measuring Voltage Between Terminal HR Of A/C Amplifier And Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard
  
  Fig 5: Voltage Results Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.
CHECK HARNESS AND CONNECTOR (BETWEEN BLOWER W/FAN MOTOR, BLOWER MOTOR CONTROL AND BATTERY)
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (SEE 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.