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Home › Lexus › 2008 › LX 570 › Repair and Diagnosis › Accessories & Equipment › Communication Devices › Cellular Communication › LEXUS Link System › DTC 4-1: Red LED Error › Inspection Procedure

Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (TELEPHONE ECU ASSEMBLY - MAP LIGHT ASSEMBLY) 
    1. Disconnect the P3 ECU connector.
    2. Disconnect the R12 map light connector.
    3. Measure the resistance according to the value(s) in the table below.

    Standard Resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    P3-4 (IND1) - R12-4 (IND1) Always Below 1 Ω
    P3-4 (IND1) or R12-4 (IND1) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR THEN CLEAR HISTORIC DTC 

    Fig 1: Identifying R12 Map Light Connector
    G05764764Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  2. CHECK MAP LIGHT ASSEMBLY (RED LED OPERATION) 
    1. Temporarily replace the map light with a new or normally functioning one (See REMOVAL ).
    2. Check that the system operates normally.

    OK: Red LED operates normally. 

    NG:  Go to step  3

    OK: END (MAP LIGHT (RED LED) IS FAULTY; CLEAR HISTORIC DTC)  (See DTC CHECK / CLEAR )

  3. REPLACE TELEPHONE ECU ASSEMBLY TOGETHER WITH MAYDAY BATTERY 

    NEXT: PERFORM REGISTRATION  (See REGISTRATION )

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