Meter / Gauge System Meter Illumination Does Not Dim At Night


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

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])

METER / GAUGE SYSTEM - Meter Illumination does not Dim at Night


DESCRIPTION

If the dimmer switch is turned to TAIL, HEAD or AUTO, the main body ECU sends a TAIL relay signal, panel light illumination signal, panel relay signal, and TAIL cancel OFF signal to the combination meter. Then the meter dims.
HINT:
TAIL cancel switch: When the headlights are illuminated and the TAIL cancel switch is turned ON, the meter does not 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 Meter Illumination Does Not Dim At Night


INSPECTION PROCEDURE

1.CHECK CAN COMMUNICATION SYSTEM

  1. Check if a CAN communication DTC is output.

    1. for LHD with Entry and Start System (LandCruiser RM000000WIB0ECX.html).

    2. for LHD without Entry and Start System (LandCruiser RM000000WIB0EDX.html).

    3. for RHD with Entry and Start System (LandCruiser RM000000WIB0EEX.html).

    4. for RHD without Entry and Start System (LandCruiser RM000000WIB0EFX.html).

      Result
      Result
      		Proceed to
      CAN communication system DTC is not output
      		A
      CAN communication system DTC is output (for LHD with Entry and Start System)
      		B
      CAN communication system DTC is output (for LHD without Entry and Start System)
      		C
      CAN communication system DTC is output (for RHD with Entry and Start System)
      		D
      CAN communication system DTC is output (for RHD without Entry and Start System)
      		E


B
GO TO CAN COMMUNICATION SYSTEM (LandCruiser RM000001RSO0C5X.html)

C
GO TO CAN COMMUNICATION SYSTEM (LandCruiser RM000001RSO0BYX.html)

D
GO TO CAN COMMUNICATION SYSTEM (LandCruiser RM000001RSO0BZX.html)

E
GO TO CAN COMMUNICATION SYSTEM (LandCruiser RM000001RSO0C0X.html)
A


2.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 3
OK

REPLACE COMBINATION METER ASSEMBLY (LandCruiser RM000003QKY01CX.html)

3.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 Meter Illumination Does Not Dim At Night

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

    2. Measure the resistance according to the value(s) in 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 Meter Illumination Does Not Dim At Night

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

    2. Measure the resistance according to the value(s) in 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


4.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

REPLACE COMBINATION METER ASSEMBLY (LandCruiser RM000003QKY01CX.html)