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Navigation ECU Power Source Circuit (From 8/2009): Procedure

  1. CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY POWER SOURCE) 
    1. Disconnect the display and navigation module display connector.
      Fig 1: Identifying Display And Navigation Module Display Connector
      GTY272001Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G4-10 (GND1) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G4-1 (+B1) - G4-10 (GND1) Always 11 to 14 V
      G4-2 (ACC) - G4-10 (GND1) Engine switch on (ACC) 11 to 14 V
      G4-3 (IG) - G4-10 (GND1) Engine switch on (IG) 11 to 14 V
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Display and Navigation Module Display)

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   2 

  2. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
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