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Home › Lexus › 2002 › SC 430 › Repair and Diagnosis › Accessories & Equipment › Infotainment › LEXUS Navigation System - Diagnosis › Map Disc Cannot Be Inserted › Inspection Procedure

Inspection Procedure

  1. INSPECT NAVIGATION ECU(+B5 ACC5 GND) 
    1. Remove the navigation ECU with connectors with still connected.
    2. Check voltage.
      1. Measure voltage between terminals +B, ACC and GND of navigation ECU at each conditions, as shown in the chart.
      Fig 1: Measuring Voltage Between Terminals +B, ACC & GND Of Navigation ECU
      G03386802Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Voltage: 

      VOLTAGE CHART

      Terminal Condition Voltage (V)
      +B <=> GND Constant 10 - 14 V
      ACC <=> GND Turn ignition switch ACC 10 - 14 V
    3. Check continuity.
      1. Check that the continuity exists between terminal GND of navigation ECU and body ground.

      Standard: Continuity exists. 

    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: CHECK AND REPLACE NAVIGATION ECU 
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