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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 700 (KEY REMINDER WARNING SYSTEM - DIAGNOSTICS)KEY REMINDER BUZZER DOES NOT SOUNDINSPECTION 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 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FRONT DOOR COURTESY LAMP SWITCH ASSY (DRIVER SIDE) 
    1. Move the room lamp switch to the DOOR position and open the driver side door. Then check that the room lamp turns ON.

      OK: Room lamp turns ON. 

    1. NG : Go to step 2 
    2. OK : Go to step   4 
  2. INSPECT FRONT DOOR COURTESY LAMP SWITCH ASSY (DRIVER SIDE) 
    1. Remove the courtesy lamp switch.
      Fig 1: Removing Courtesy Lamp Switch
      G03050029Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the switch.

      Standard: 

      CONNECTOR SPECIFIED TERMINAL

      Tester Connection Switch Condition Specified Condition
      1 - Body ground Not pushed (ON) Below 1 Ω
      1 - Body ground Pushed (OFF) 10 kΩ or higher
    1. NG : REPLACE FRONT DOOR COURTESY LAMP SWITCH ASSY (DRIVER SIDE) 
    2. OK : Go to next step 
  3. CHECK WIRE HARNESS (FRONT DOOR COURTESY LAMP SWITCH ASSY LH - MULTIPLEX NETWORK BODY ECU) 
    1. Disconnect the D5 switch connector.
      Fig 2: Disconnecting D5 Switch Connector
      G03050030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the B8 ECU connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard: 

      CONNECTOR SPECIFIED TERMINAL

      Tester Connection Specified Condition
      D5-1 - B8-14 (DCTY) Below 1 Ω
    1. NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK : Go to next step 
  4. CHECK BUZZER (COMBINATION METER) 
    1. Check that the buzzer built into the combination meter sound (see WARNING BUZZER DOES NOT SOUND ).

      OK: Buzzer sounds. 

    1. NG : REPLACE COMBINATION METER ASSY 
    2. OK : Go to next step 
  5. INSPECT UNLOCK WARNING SWITCH ASSY 
    1. Remove the unlock warning switch.
      Fig 3: Removing Unlock Warning Switch
      G03050031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the switch.

      Standard: 

      CONNECTOR SPECIFIED TERMINAL

      Tester Connection Switch Condition Specified Condition
      1 - 2 Not pushed 10 kΩ or higher
      1 - 2 Pushed Below 1 Ω
    1. NG : REPLACE UNLOCK WARNING SWITCH ASSY 
    2. OK : Go to next step 
  6. CHECK WIRE HARNESS (UNLOCK WARNING SWITCH ASSY - MULTIPLEX NETWORK BODY ECU AND BODY GROUND) 
    1. Disconnect the U1 switch connector.
      Fig 4: Disconnecting U1 Switch Connector
      G03050032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the B6 ECU connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard: 

      CONNECTOR SPECIFIED TERMINAL

      Tester Connection Specified Condition
      U1-2 - B6-21 (KSW) Below 1 Ω
      U1-1 - Body ground Below 1 Ω
    1. NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK : REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSY (MULTIPLEX NETWORK BODY ECU) 
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.