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Inspection Procedure

NOTE: First perform the communication function inspections in HOW TO PROCEED WITH TROUBLESHOOTING  to confirm that there are no LIN communication malfunctions before troubleshooting this symptom.
  1. CHECK CONDITION 
    1. Check the malfunction conditions.

      Result 

      RESULT CHART

      Result Proceed to
      All conditions below A
      Engine switch on (ACC) or (IG) → Engine switch off B
      All doors open → a door opened C
      All doors locked → a door unlocked D

      B: REPLACE MAIN BODY ECU 

      C:  GO TO PROBLEM SYMPTOMS TABLE (COURTESY LIGHT) 

      D: GO TO PROBLEM SYMPTOMS TABLE (DOOR UNLOCK)  (See PROBLEM SYMPTOMS TABLE )

      A: Go to next step 

  2. CONFIRM LIGHT POSITION 
    1. Check the malfunctioning dome light.

      Result 

      RESULT CHART

      Result Proceed to
      Front dome light and rear dome light A
      Front dome light B
      Rear dome light C

      B: REPLACE MAP LIGHT ASSEMBLY (See  REMOVAL   ) 

      C:  Go to step  5

      A: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (MAP LIGHT - BODY GROUND) 
    1. Disconnect the X4 and X6 light connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      X4-16 (GND9) - Body ground Always Below 1 Ω
      X6-20 (GND4) - Body ground Always Below 1 Ω
      Fig 1: Identifying X4 And X6 Light Connector Terminals
      G04944754Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (BATTERY - MAP LIGHT) 
    1. Disconnect the X4 light connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      X4-27 (DOME) - Body ground Always 11 to 14 V
      Fig 2: Identifying X4 Light Connector Terminals
      G04944755Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE MAP LIGHT ASSEMBLY (See  REMOVAL   ) 

  5. CHECK MAP LIGHT ASSEMBLY (ILLB VOLTAGE) 
    1. Disconnect the X4 and X6 light connectors.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      X4-11 (ILLB) - X6-20 (GND4) Always 11 to 14 V
      Fig 3: Identifying X4 And X6 Light Connector Terminals
      G04944756Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE MAP LIGHT ASSEMBLY (See  REMOVAL   ) 

      OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (MAP LIGHT - REAR MAP LIGHT) 
    1. Disconnect the X4, X6 and X12 light connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      X4-11 (ILLB) - X12-8 (B) Always Below 1 Ω
      X6-18 (RILL) - X12-9 (E) Always Below 1 Ω
      X4-11 (ILLB) - Body ground Always 10 kΩ or higher
      X6-18 (RILL) - Body ground Always 10 kΩ or higher
      Fig 4: Identifying X4, X6 And X12 Light Connector Terminals
      G04944757Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to next step 

  7. CHECK REAR MAP LIGHT (OPERATION) 
    1. Temporarily replace the rear map light with a new or normally functioning one (see REMOVAL  ).
    2. Check the rear map light operation.

      OK: 

      Rear map light operation is normal. 

      NG: REPLACE MAP LIGHT ASSEMBLY (See  REMOVAL   ) 

      OK: REPLACE REAR MAP LIGHT (See  REMOVAL   ) 

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