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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 +BATT, ACC, IG and GND of network gateway ECU. 
    1. Disconnect the connector from the network gateway ECU.
    2. Measure the voltage according to the value(s) in VOLTAGE CONDITION  .

      Standard: 

      VOLTAGE CONDITION

      Tester connection Condition Specified condition
      BATT - GND Always 10 to 14V
      ACC - GND Ignition SW ACC 10 to 14V
      IG - GND Ignition SW ON 10 to 14V
      Fig 1: Identifying Voltage Terminals
      G03071056Courtesy 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 network gateway ECU and body ground. 
    1. Disconnect the connector from the network gateway 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 Network Gateway ECU
      G03071057Courtesy 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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