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Home >> Lexus >> 2003 >> 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(+B, ACC, GND) 
    1. Remove the navigation ECU with connectors still connected.
    2. Check voltage.
      1. Measure voltage between terminals +B, ACC and GND1 of navigation ECU under each condition, as shown in the chart.

      Voltage: 

      TERMINAL SPECIFICATION

      Terminal Condition Voltage (v)
      +B <--> GND1 Constant 10-14V
      ACC <--> GND1 Turn ignition switch ACC 10-14V
    3. Check continuity.
      1. Check that the continuity exists between terminal GND1 of navigation ECU and body ground.

      Standard: Continuity exists. 

      Fig 1: Inspecting Navigation ECU (+B, ACC, GND)
      G03370713Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: CHECK AND REPLACE NAVIGATION ECU 
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