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 600 (AUDIO SYSTEM - DIAGNOSIS)AUTOMATIC SOUND LEVELIZER FUNCTION IS ABNORMAL OPERATIONINSPECTION 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 2002 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

SERVICE CHECK MODE(GATEWAY ECU)
1. Service check
  1. Activate the diagnosis system and read out the check results in the service check mode.
  Standard: "NCON (No Connection) " or nothing displayed
1. NG: GO TO MULTIPLEX COMMUNICATION SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING )
2. OK: GO TO NEXT STEP

CHECK WIRE HARNESS OR CONNECTOR (RADIO RECEIVER ASSY-GATEWAY ECU)

Disconnect the radio receiver assy and gateway ECU.

Check continuity wire harness.

Standard:

RADIO RECEIVER ASSY AND GATEWAY ECU TERMINALS CONTINUITY

Terminal	Condition	Specified condition
TX+ - GTX+	Constant	Continuity
TX-- GTX-	Constant	Continuity
TXS+ - Body ground	Constant	No continuity
TXS-- Body ground	Constant	No continuity

Radio Receiver Assy

Fig 1: Identifying Radio Receiver Assy Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
GATEWAY ECU

Fig 2: Identifying Gateway ECU Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: GO TO COMBINATION METER SYSTEM (SEE HOW TO PROCEED WITH TROUBLESHOOTING )
OK: GO TO NEXT STEP

INSPECT COMBINATION METER ASSY (SPEEDOMETER) (SEE MALFUNCTION IN SPEED METER )
1. NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
2. OK: GO TO NEXT STEP
INSPECT STEREO COMPONENT AMPLIFIER ASSY (SPD)
1. Check voltage.
  1. Shift the shift lever to neutral.
  2. Jack up one of the front wheel.
  3. Turn ignition switch ON.
  4. Measure voltage between terminals SPD and GND of stereo component amplifier when the front wheels are turned slowly.
  Voltage is generated intermittently.
  
  Fig 3: Stereo Component Amplifier Assy Terminals Voltage Graph
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.