Operating Light Control Rheostat does not Change Light Brightness [09/2015 - ]: Procedure

1. Operate the Techstream according to the display and select the Data List. Refer to DATA LIST / ACTIVE TEST [09/2015 - 08/2017] , or refer to DATA LIST / ACTIVE TEST [08/2017 - ] ).
   COMBINATION METER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Tail Cancel SW	TAIL cancel switch condition/ON or OFF	ON: TAIL cancel switch on OFF: TAIL cancel switch off	-
   Rheostat value	Light control rheostat switch input/Min.: 0, Max.: 100	Light control rheostat switch is fully turned left (0) → fully turned right (100)	Unit: %

   OK

   Light brightness can be changed within specified range by manual operation.

Result: 

NG 

REPLACE COMBINATION METER ASSEMBLY 

Refer to REMOVAL [09/2015 - ] )

Result: 

OK 

See step  2

1. Remove the light control rheostat. Refer to REMOVAL [09/2015 - ] ).
2. Inspect the light control rheostat. Refer to INSPECTION [09/2015 - ] ).

Result: 

NG 

REPLACE LIGHT CONTROL RHEOSTAT 

Refer to REMOVAL [09/2015 - ] )

Result: 

OK 

See step  3

1. Disconnect the E120 combination meter assembly connector.
2. Disconnect the E9 light control rheostat connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E120-30 (ILL+) - E9-5 (T)	Always	Below 1 Ω
   E120-31 (TR) - E9-7 (TR)	Always	Below 1 Ω
   E120-19 (E2) - E9-1 (E)	Always	Below 1 Ω
   E120-32 (TC) - E9-6 (TC)	Always	Below 1 Ω
   E120-30 (ILL+) or E9-5 (T) - Body ground	Always	10 kΩ or higher
   E120-31 (TR) or E9-7 (TR) - Body ground	Always	10 kΩ or higher
   E120-19 (E2) or E9-1 (E) - Body ground	Always	10 kΩ or higher
   E120-32 (TC) or E9-6 (TC) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY 

Refer to REMOVAL [09/2015 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR