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Home >> Lexus >> 2004 >> LX 470 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> LEXUS Navigation System - Diagnosis >> Circuit Inspection >> Power Source Circuit (Multi-Display Assembly) >> Inspection Procedure

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: 

      MULTI-DISPLAY ASSEMBLY B1, ACC, IG AND GND TERMINALS VOLTAGE

      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: Checking Voltage Between Terminals B1, ACC, IG And GND Of Multi-Display Assembly
      G03477084Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Proceed to next circuit inspection shown in. (See  PROBLEM SYMPTOMS TABLE  
    2. NG 
  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: 

      MULTI-DISPLAY ASSEMBLY GND1 TERMINAL AND BODY GROUND RESISTANCE

      Tester connection Condition Specified condition
      GND1 - Body ground Always Below 1 Ω
      Fig 2: Checking Continuity Between Terminal GND1 Of Multi-Display Assembly And Body Ground
      G03477085Courtesy 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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