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Home >> Lexus >> 2003 >> RX 300 AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> LEXUS Navigation System - Diagnosis >> Circuit Inspection >> 11. No sound (radio, cassette tape, CD) can be heard from driver side door speaker only. >> Inspection Procedure

Inspection Procedure

  1. Service check mode. 
    1. NG: Troubleshoot for each diagnosis. 
    2. OK: Go to next step. 
  2. Check wire harness (between navigation ECU and radio receiver assembly). 

    PREPARATION: 

    Disconnect the navigation ECU and radio receiver assembly connector.

    CHECK: 

    1. Check continuity between terminal AUI+ of navigation ECU connector and terminal FL+ of radio receiver assembly.
    2. Check continuity between terminal AUI- of navigation ECU connector and terminal FL- of radio receiver assembly.

    OK: 

    Continuity 

    1. NG: Replace or repair wire harness. 
    2. OK: Go to next step. 
  3. Check the navigation system voice. 
    1. OK: Go to step   6 . 
    2. NG: Go to next step. 
  4. Check wire harness (between navigation ECU and driver side door speaker). 

    PREPARATION: 

    Disconnect the navigation ECU and driver side door speaker connector.

    CHECK: 

    1. Check continuity between terminal AUO+ of navigation ECU connector and terminal 1 of driver side door speaker.
    2. Check continuity between terminal AUO- of navigation ECU connector and terminal 2 of driver side door speaker.

    OK: 

    Continuity 

    1. NG: Replace or repair wire harness. 
    2. OK: Go to next step. 
  5. Check the driver side door speaker. 
    1. NG: Replace the speaker. 
    2. OK: Replace the navigation ECU. 
  6. Check the navigation ECU. 

    CHECK: 

    Check terminal AUO+, AUO-, AUI+ and AUI-.

    OK: 

    AUO+, AUO-, AUI+ and AUI-: See " NAVIGATION ECU  " of "TERMINAL OF ECU". 

    1. NG: Replace the navigation ECU. 
    2. OK: Replace the radio receiver assembly. 
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