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

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WIRING DIAGRAM


E110188E02


INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER

  1. Operate the intelligent tester according to the steps on the display and select "DATA LIST".

    METER 
    Item
    		Measurement Item/Range (Display)
    		Normal Condition
    		Diagnostic Note
    Light Control Rheostat
    		Light control rheostat / Min.: 0, Max.: 255
    		Light control rheostat switch is Dark (0) → Bright (255)
    		-

    OK:
    Light brightness can be changed within the specified range by actual operation.



NG
Go to step 2
OK

REPLACE COMBINATION METER ASSEMBLY 

2.INSPECT LIGHT CONTROL RHEOSTAT


    E111191E03

  1. Remove the light control rheostat with connector still connected.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    R6-1 (E) - R6-7 (RV)
    		Rheostat knob is in the MAX. position
    		8 to 12 kΩ
    R6-1 (E) - R6-7 (RV)
    		Rheostat knob is in the MIN. position.
    		Approx. 0 Ω



NG
REPLACE LIGHT CONTROL RHEOSTAT
OK


3.CHECK HARNESS AND CONNECTOR (BETWEEN COMBINATION METER AND LIGHT CONTROL RHEOSTAT)


    E111192E04

  1. Disconnect the C9 and R6 connectors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C9-13 (RE) -
    R6-1 (E)
    		Always
    		Below 1 Ω
    C9-14 (VR) -
    R6-7 (RV)
    		Always
    		Below 1 Ω
    R6-7 (RV) -
    Body ground
    		Always
    		10 kΩ or higher
    R6-1 (E) -
    Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE COMBINATION METER ASSEMBLY