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Home >> Lexus >> 2008 >> RX 400h AWD >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Navigation >> Navigation System >> Vehicle Speed Signal Circuit between Multi-display and Combination Meter >> Inspection Procedure

Inspection Procedure

  1. CHECK OPERATION OF SPEEDOMETER 
    1. Drive the vehicle and check if the function of the speedometer in the combination meter is normal.

      OK: Actual vehicle speed and the speed indicated on the speedometer are the same. 

      HINT:

      The vehicle speed sensor is functioning normally when the indication on the speedometer is normal.

    NG:  GO TO COMBINATION METER

    OK: Go to Next Step 

  2. INSPECT MULTI-DISPLAY 
    1. Disconnect the multi-display connector M5.
    2. Measure voltage.
      1. Jack up either one of the drive wheels.
      2. Move the shift lever to the neutral position.
      3. Turn the ignition switch to the ON position.
        Fig 1: Identifying M5 Multi-Display Connector Terminals
        G05270961Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Measure the voltage between terminal SPD of the wire harness connector and body ground when the drive wheels are turned slowly.

        OK: Voltage pulses as shown in the illustration. 

      Fig 2: Terminal Voltage Pattern
      G05863913Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE MULTI-DISPLAY 

    NG: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (COMBINATION METER - MULTI-DISPLAY) 
    1. Disconnect the multi-display connector M5 and combination meter connector C8.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester connection Condition Specified condition
      SPD - C8-6 Ignition switch off Below 1 Ω
    3. Fig 3: Identifying M5 And C8 Connector Terminals
      G05270963Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - BODY GROUND) 
    1. Disconnect the multi-display connector M5.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester connection Condition Specified condition
      SPD - Body ground Ignition switch off 10 kΩ or higher

      HINT:

      If the resistance between terminal SPD and body ground is less than 10 kΩ, there may be a short in a wire harness, connector, or an ECU that is connected to the SPD signal wire.

    3. Fig 4: Identifying M5 Multi-Display Connector Terminals
      G05270961Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU 

    OK: REPLACE COMBINATION METER