Meter / Gauge System Operating Light Control Rheostat Does Not Change Light Brightness


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (TAIL CANCEL SW, RHEOSTAT VALUE)

INSPECT TRIP SWITCH (LIGHT CONTROL RHEOSTAT)

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - TRIP SWITCH [LIGHT CONTROL RHEOSTAT])

CHECK COMBINATION METER ASSEMBLY

METER / GAUGE SYSTEM - Operating Light Control Rheostat does not Change Light Brightness


DESCRIPTION

When the light control rheostat knob is turned right, the combination meter and vehicle interior illumination will become brighter. When the light control rheostat knob is turned left, the combination meter and vehicle illumination will dim.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Meter Gauge Display.Meter / Gauge System.Meter / Gauge System Operating Light Control Rheostat Does Not Change Light Brightness


INSPECTION PROCEDURE

1.READ VALUE USING GTS (TAIL CANCEL SW, RHEOSTAT VALUE)

  1. Using the GTS, read the Data List (LandCruiser RM0000012G70JTX.html).

    Combination Meter
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Tail Cancel SW*
    		Tail cancel switch/OFF or ON
    		OFF: Tail cancel switch off
    		-
    ON: Tail cancel switch on
    Rheostat value
    		Light control rheostat switch input/Min.: 0, Max.: 100
    		Light control rheostat switch is fully turned right (0) → fully turned left (100)
    		Unit: %
    1. *: w/ TAIL Cancel Switch
    OK:
    Light brightness can be changed within specified range by manual operation.


NG
Go to step 2
OK

REPLACE COMBINATION METER ASSEMBLY (LandCruiser RM000003QKY01CX.html)

2.INSPECT TRIP SWITCH (LIGHT CONTROL RHEOSTAT)


  1. Inspect the light control rheostat. (w/o TAIL Cancel Switch)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Meter Gauge Display.Meter / Gauge System.Meter / Gauge System Operating Light Control Rheostat Does Not Change Light Brightness

    1. Remove the light control rheostat (LandCruiser RM000003QKY01DX.html).

    2. Measure the resistance according to the table below.

      Standard Resistance:
      for LHD
      Tester Connection
      		Switch Condition
      		Specified Condition
      5 (T) - 1 (E)
      		Always
      		8 to 12 kΩ
      7 (RV) - 1 (E)
      		Light control rheostat fully turned right → fully turned left
      		Below 100 Ω → 8 to 12 kΩ
      for RHD
      Tester Connection
      		Switch Condition
      		Specified Condition
      8 (T) - 4 (E)
      		Always
      		8 to 12 kΩ
      6 (RV) - 4 (E)
      		Light control rheostat fully turned right → fully turned left
      		Below 100 Ω → 8 to 12 kΩ


  1. Inspect the light control rheostat. (w/ TAIL Cancel Switch)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Meter Gauge Display.Meter / Gauge System.Meter / Gauge System Operating Light Control Rheostat Does Not Change Light Brightness

    1. Remove the light control rheostat (LandCruiser RM000003QKY01DX.html).

    2. Measure the resistance according to the table below.

      Standard Resistance:
      for LHD
      Tester Connection
      		Switch Condition
      		Specified Condition
      5 (T) - 6 (TC)
      		TAIL cancel switch off → on
      		1 MΩ or higher → Below 1 Ω
      5 (T) - 1 (E)
      		Always
      		8 to 12 kΩ
      7 (RV) - 1 (E)
      		Light control rheostat fully turned right → fully turned left
      		Below 100 Ω → 8 to 12 kΩ
      for RHD
      Tester Connection
      		Switch Condition
      		Specified Condition
      8 (T) - 7 (TC)
      		TAIL cancel switch off → on
      		1 MΩ or higher → Below 1 Ω
      8 (T) - 4 (E)
      		Always
      		8 to 12 kΩ
      6 (RV) - 4 (E)
      		Light control rheostat fully turned right → fully turned left
      		Below 100 Ω → 8 to 12 kΩ


NG
REPLACE TRIP SWITCH (LIGHT CONTROL RHEOSTAT) (LandCruiser RM000003QKY01DX.html)
OK


3.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - TRIP SWITCH [LIGHT CONTROL RHEOSTAT])

  1. Disconnect the G6 combination meter assembly connector.

  1. Disconnect the G16 trip switch (light control rheostat) connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    for LHD
    Tester Connection
    		Condition
    		Specified Condition
    G6-10 (TC) - G16-6 (TC)*
    		Always
    		Below 1 Ω
    G6-6 (SW1) - G16-5 (T)
    		Always
    		Below 1 Ω
    G6-7 (SW2) - G16-7 (RV)
    		Always
    		Below 1 Ω
    G6-22 (SW3) - G16-1 (E)
    		Always
    		Below 1 Ω
    for RHD
    Tester Connection
    		Condition
    		Specified Condition
    G6-10 (TC) - G16-7 (TC)*
    		Always
    		Below 1 Ω
    G6-6 (SW1) - G16-8 (T)
    		Always
    		Below 1 Ω
    G6-7 (SW2) - G16-6 (RV)
    		Always
    		Below 1 Ω
    G6-22 (SW3) - G16-4 (E)
    		Always
    		Below 1 Ω
    G6-22 (SW3) - G16-4 (E)
    		Always
    		Below 1 Ω
    1. *: w/ TAIL Cancel Switch


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK COMBINATION METER ASSEMBLY

  1. Replace the combination meter assembly with a new or normally operating one. Perform an operation inspection.

    OK:
    Combination meter assembly operates normally.


NG
GO TO LIGHTING SYSTEM (LandCruiser RM000002WKK03MX.html)
OK

END (COMBINATION METER ASSEMBLY IS DEFECTIVE)