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)VEHICLE SPEED SIGNAL 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.

INSPECT HEATER CONTROL HOUSING SUB-ASSY(SPD)
1. Remove A/C amplifier with connectors still connected.
2. Shift the shift lever to neutral.
3. Lift up the vehicle.
4. Turn the ignition switch ON.
5. Measure voltage between terminal SPD of the A/C amplifier connector and body ground when the front wheel is turned slowly.
  Voltage is generated intermittently:
  
  Fig 1: Measuring Voltage Between Terminal SPD Of A/C Amplifier Connector And Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (SEE PROBLEM SYMPTOMS TABLE )

NG: Go to next step.

Voltage

Fig 2: Identifying Graphic Of Voltage Generated Intermittently
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK COMBINATION METER ASSY
1. Remove combination meter with connector.
2. Shift the shift lever to neutral.
3. Lift up the vehicle.
4. Turn the ignition switch ON.
5. Measure voltage between terminal C7-33 of the combination meter and body ground when the front wheel is turned slowly.
  Voltage is generated intermittently:
  
  Fig 3: Measuring Voltage Between Terminal C7-33 Of Combination Meter And Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

RENDER: 1.0x

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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.