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Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check voltage between terminals +B1, ACC and GND of navigation ECU. 
    1. Disconnect the connector from the navigation ECU.
    2. Measure the voltage according to the value(s) in VOLTAGE CONDITION  .

      Standard: 

      VOLTAGE CONDITION

      Tester connection Condition Specified condition
      +B1 - GND Always 10 to 14V
      ACC - GND Ignition SW ACC 10 to 14V
      Fig 1: Disconnecting Connector From Navigation ECU
      G03071050Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Proceed to next circuit inspection shown in  PROBLEM SYMPTOMS TABLE   . 
    2. NG: Go to next step. 
  2. Check continuity between terminal GND of navigation ECU and body ground. 
    1. Disconnect the connector from the navigation ECU.
    2. Measure the resistance according to the value(s) in RESISTANCE CONDITION  .

      Standard: 

      RESISTANCE CONDITION

      Tester connection Condition Specified condition
      GND - Body ground Always Below 1 Ω
      Fig 2: Disconnecting Connector From Navigation ECU
      G03071051Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Repair or replace harness or connector between navigation ECU and fuse. 
    2. NG: Repair or replace harness or connector between navigation ECU and body ground. 
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