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 738 (FRONT POWER SEAT CONTROL SYSTEM (WITH MEMORY) - DIAGNOSIS)PARK/NEUTRAL POSITION SWITCH 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 HARNESS AND CONNECTOR (POSITION CONTROL ECU & SWITCH ASSY - BATTERY)
1. Disconnect M6 ECU connector.
2. Measure the voltage of each terminal of the wire harness side connectors.
  Standard:
  
  Fig 2: Harness and Connector (Position Control ECU & Switch Assy. - Battery) Voltage Table
  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.
INSPECT PARK/NEUTRAL POSITION SWITCH ASSY
1. Disconnect A4 switch connector.
2. Measure the resistance of each terminal of the wire harness side connectors.
  Standard:
  
  Fig 4: Park/Neutral Position Switch Assy Resistance Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NG: REPLACE PARK/NEUTRAL POSITION SWITCH ASSY (See PARK/NEUTRAL POSITION SWITCH )
  
  OK: Go to next step.
CHECK HARNESS AND CONNECTOR (BATTERY - PARK/NEUTRAL POSITION SWITCH ASSY)
1. Measure the voltage of each terminal of the wire harness side connectors.
  
  Fig 5: Checking Harness And Connector A4
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 6: Harness & Connector (Battery - Park/Neutral Position Switch Assy) Voltage Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
  
  OK: Go to next step.
CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSY - POSITION CONTROL ECU & SWITCH ASSY)
1. Measure the resistance of each terminal of the wire harness side connectors.
  
  Fig 7: Identifying Wire Harness Side M6
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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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.