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Operating Light Control Rheostat does not Change Light Brightness: Wiring Diagram

Fig 1: Operating Light Control Rheostat Not Change Light Brightness - Wiring Diagram
G04050029Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. SYSTEM CHECK 

    Result 

    RESULT REFERENCE

    Result Proceed to
    Meter illumination does not change when operate the light control rheostat knob A
    Dimmer cancel does not operate B

    B : Go to step  7

    A : Go To Next Step 

  2. READ VALUE OF INTELLIGENT TESTER (RHEOSTAT VOL) 
    1. Connect the intelligent tester to the DLC3.
    2. Engine switch on (IG).
    3. Turn the tester ON.
    4. Enter the following menus: DIAGNOSIS / OBD/MOBD / METER / DATA LIST.
    5. Check the values by referring to the table below.

    METER: 

    METER DISPLAY DIAGNOSTIC REFERENCE

    Item Measurement Item/Range (Display) Normal Condition Diagnostic Note
    RHEOSTAT VOL Light control rheostat/Min.: 0, Max.: 255 Light control rheostat switch is Dark (0) --> Bright (255) -

    OK: 

    The value displayed on the tester gradually changes as the actual rheostat operation. 

    NG : Go to step  4

    OK : Go To Next Step 

  3. READ VALUE OF INTELLIGENT TESTER (TAIL CANCEL SW) 
    1. Connect the intelligent tester to the DLC3.
    2. Engine switch on (IG).
    3. Turn the tester ON.
    4. Enter the following menus: DIAGNOSIS / OBD/MOBD / METER / DATA LIST.
    5. Check the values by referring to the table below.

    METER: 

    METER DISPLAY DIAGNOSTIC REFERENCE

    Item Measurement Item/Range (Display) Normal Condition Diagnostic Note
    TAIL CANCEL SW Tail cancel switch is ON/OFF ON: Light control rheostat turns fully clockwise
    OFF: Light control rheostat position is except above.    		 -

    OK: 

    Rheostat position displayed on the tester is same as the actual rheostat position. 

    NG : Go to step  7

    OK : REPLACE COMBINATION METER ASSEMBLY 

  4. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Remove the light control rheostat with the connector still connected.
    2. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    STANDARD RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    E (J15-1) - RV (J15-4) Turn the rheostat knob fully clockwise 8 to 12 kΩ
    E (J15-1) - RV (J15-4) Rheostat knob is between MIN. and MAX. The value changes gradually (Between approx. 0 to 8 kΩ)
    E (J15-1) - RV (J15-4) Turn the rheostat knob fully counterclockwise Approx. 0 Ω
    Fig 2: Identifying Light Control Rheostat With Connector Terminal
    G04050030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPLACE LIGHT CONTROL RHEOSTAT 

    OK : Go To Next Step 

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT) 
    1. Disconnect the J34 and J15 connectors.
    2. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    STANDARD RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    J34-14 (ET) - J15-1 (E) Always Below 1 Ω
    J34-9 (ILL+) - J15-3 (T) Always Below 1 Ω
    J34-21 (TR) - J15-4 (RV) Always Below 1 Ω
    J15-1 (E) - Body ground Always 10 kΩ or higher
    J15-3 (T) - Body ground Always 10 kΩ or higher
    J15-4 (RV) - Body ground Always 10 kΩ or higher
    Fig 3: Identifying J34 And J15 Connectors Terminals
    G04050031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : REPLACE COMBINATION METER ASSEMBLY 

  6. READ VALUE OF INTELLIGENT TESTER (TAIL CANCEL SW) 
    1. Connect the intelligent tester to the DLC3.
    2. Engine switch on (IG).
    3. Turn the tester ON.
    4. Enter the following menus: DIAGNOSIS / OBD/MOBD / METER / DATA LIST.
    5. Check the values by referring to the table below.

    METER: 

    METER DISPLAY DIAGNOSTIC REFERENCE

    Item Measurement Item/Range (Display) Normal Condition Diagnostic Note
    TAIL CANCEL SW Tail cancel switch is ON/OFF ON: Light control rheostat turns fully clockwise
    OFF: Light control rheostat position is except above.    		 -

    OK: 

    Rheostat position displayed on the tester is same as the actual rheostat position. 

    NG : Go to step 7 

    OK : REPLACE COMBINATION METER ASSEMBLY 

  7. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Remove the light control rheostat with connector still connected.
    2. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    STANDARD RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    T (J15-2) - TC (J15-3) Turn the rheostat knob fully counterclockwise Below 1 Ω
    T (J15-2) - TC (J15-3) Turn the rheostat knob fully clockwise 10 kΩ or higher
    Fig 4: Identifying Light Control Rheostat With Connector Terminal
    G04050032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPLACE LIGHT CONTROL RHEOSTAT 

    OK : Go To Next Step 

  8. CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT) 
    1. Disconnect the J34 and J15 connectors.
    2. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    STANDARD RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    J34-8 (TC) - J15-2 (TC) Always Below 1 Ω
    J15-2 (TC) - Body ground Always 10 kΩ or higher
    Fig 5: Identifying J34 And J15 Connectors Terminals
    G04050033Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : REPLACE COMBINATION METER ASSEMBLY 

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