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 796 (AIR CONDITIONING)HEATER MAIN RELAYINSPECTION

2004 Toyota Matrix XR, FWD, Standard

Heater Main Relay: Inspection

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection

WARNING: This page is about a different car, the 2004 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

REMOVE FRONT DOOR SCUFF PLATE LH (See REMOVAL )
REMOVE COWL SIDE TRIM BOARD LH (See REMOVAL )
REMOVE HEATER MAIN RELAY
1. Disconnect the connectors.
2. Remove the 2 passenger side junction block set nuts.
  
  Fig 1: Removing Passenger Side Junction Block Set Nuts
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Remove the heater main relay from passenger side junction block.
  
  Fig 2: Removing Heater Main Relay From Passenger Side Junction Block
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT HEATER MAIN RELAY CONTINUITY

Fig 3: Inspecting Heater Main Relay Continuity (1 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If continuity is not as specified, replace the relay.

Fig 4: Inspecting Heater Main Relay Continuity (2 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSTALL HEATER MAIN RELAY
1. Install the heater main relay to passenger side junction block.
2. Install the passenger side junction block set nuts.
3. Connect the connectors.
INSTALL COWL SIDE TRIM BOARD LH (See INSTALLATION )
INSTALL FRONT DOOR SCUFF PLATE LH (See INSTALLATION )

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.