LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 858 (LEXUS Navigation System - Diagnosis) >> Circuit Inspection >> 39. Pressing the "Call" or "HOOK" switch does not activate voice recognition. >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check whether or not these switches operate normally in other cellular mobile phones. 
    1. NG : Replace cellular mobile telephone (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    2. OK : Go to next step. 
  2. Check wire harness between cellular mobile telephone and telephone transceiver and speaker relay. 

    PREPARATION: 

    Disconnect the cellular mobile telephone and telephone transceiver and speaker relay connectors.

    CHECK: 

    Check continuity of the wire harness between terminals of the cellular mobile telephone and those of the telephone transceiver and speaker relay.

    OK: 

    Continuity 

    1. NG : Replace or repair wire harness or connector (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    2. OK : Replace telephone transceiver and speaker relay (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ).