LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2005 >> GX 470 >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (LEXUS Navigation System - Diagnostics) >> Circuit Inspection >> Power Source Circuit (Multi-Display Assembly) >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

WARNING: This page is about a different car, the 2005 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  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. 
scientia non olet · About LEMON Manuals