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DTC 4-1: Red LED Error: Procedure

  1. CHECK HARNESS AND CONNECTOR (TELEPHONE ECU ASSEMBLY - MAP LIGHT ASSEMBLY) 
    Fig 1: Identifying R12 Map Light Connector
    GTY122610Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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

      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 

    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. Refer to REMOVAL .
    2. Check that the system operates normally.

      OK

      Red LED operates normally.

    NG → See step   3 

    OK → See step   5 

  3. REPLACE TELEPHONE ECU ASSEMBLY TOGETHER WITH MAYDAY BATTERY 

    NEXT → See step   4 

  4. PERFORM REGISTRATION. Refer to  REGISTRATION 
  5. END (MAP LIGHT (RED LED) IS FAULTY; CLEAR HISTORIC DTC). Refer to  DTC CHECK / CLEAR 
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