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Home >> Lexus >> 2005 >> LX 470 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> LEXUS Navigation System - Diagnostics >> Circuit Inspection >> Power Source Circuit (Multi-Display Assembly) >> Inspection Procedure
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Inspection Procedure

  1. Check voltage between terminals B1, ACC, IG and GND of multi-display assembly. 
    1. Disconnect the connector from the multi-display assembly.
    2. Measure the voltage according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester connection Condition Specified condition
      B1 - GND1 Always 10 to 14 V
      ACC - GND1 Ignition SW ACC 10 to 14 V
      IG - GND1 Ignition SW ON 10 to 14 V
    Fig 1: Locating Terminals B1, ACC, IG and GND
    G02988037Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Proceed to next circuit inspection shown in problem symptoms table. (See  PROBLEM SYMPTOMS TABLE   ) 
    2. NG: Go To Next Step. 
  2. Check continuity between terminal GND1 of multi-display assembly and body ground. 
    1. Disconnect the connector from the multi-display assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester connection Condition Specified condition
      GND1 - Body ground Always Below 1 Ω
    Fig 2: Locating Terminal GND1
    G02988038Courtesy 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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