Operating Light Control Rheostat does not Change Light Brightness

WIRING DIAGRAM

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

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:

   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)

1. Disconnect the C9 and R6 connectors.

2. 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