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Navigation Receiver Assembly Power Source Circuit: Procedure

  1. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - BATTERY AND BODY GROUND) 
    1. Disconnect the G21 and G18 navigation receiver assembly connectors.
      Fig 1: Identifying G21 And G18 Navigation Receiver Assembly Connector Terminal Identification
      GTY235918Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      G21-20 (GND) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G21-1 (B) - G21-20 (GND) Always 11 to 14 V
      G21-11 (ACC) - G21-20 (GND) Ignition switch ACC 11 to 14 V
      G18-2 (IG) - G21-20 (GND) Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Navigation Receiver Assembly)

    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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