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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 515 (MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSIS)DTC B1207: SMART ECU COMMUNICATION STOPINSPECTION 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 Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK OPERATION 
    1. With the smart key in your possession, push the lock button on the door outside handle (smart door lock operation). Check that the smart indicator illuminates or starts blinking.

      With the smart key in your possession, touch the inside of the door outside handle (smart door unlock operation). Check that the smart indicator illuminates or starts blinking.

      OK: Smart indicator illuminates or starts blinking. 

    NG: Go to step   3 

    OK: Go to next step. 

  2. CHECK WIRE HARNESS (SMART ECU - BODY GROUND) 
    1. Disconnect the S11 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.

      Standard: 

      TESTER CONNECTION'S SPECIFIED CONDITION

      Tester Connection Specified Condition
      S11-1 (+B) - Body ground 10 to 14 V
      S11-17 (E) - Body ground Below 1 Ω
    Fig 1: Identifying S11 Smart ECU Connector Terminals
    G02919797Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step. 

  3. CHECK RESISTANCE OF COMMUNICATION LINE 
    1. Disconnect the S11 and T4 ECU connectors.
    2. Disconnect the C10 meter connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard: 

      TESTER CONNECTION'S SPECIFIED CONDITION

      Tester Connection Specified Condition
      S11-31 (MPX1) - T4-19 (MPX1) Below 1 Ω
      S11-32 (MPX2) - C10-24 (MPX+) Below 1 Ω

      Result: 

      DESCRIPTION

      Result Proceed to
      Both are OK A
      One is OK B
      Both are NG C
    Fig 2: Identifying S11, T4 ECU Connectors & C10 Meter Connector Terminals (Wire Harness Side)
    G02919798Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    B: REPLACE SMART ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR 

    C: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    A: REPLACE SMART 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.