Operating Light Control Rheostat does not Change Light Brightness: Procedure

1. Using the Techstream, read the Data List. Refer to DATA LIST / ACTIVE TEST .
   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 value / Min.: 0 %, Max.: 100 %	0 to 100 %	-

   OK

   The value displayed on the Techstream changes in accordance with the actual rheostat switch operation.

NG → See step   2 

OK → See step   6 

1. Remove the light control rheostat. Refer to REMOVAL .
2. Inspect the trip light control rheostat. Refer to INSPECTION .

NG → See step   5 

OK: Go to next step 

1. Disconnect the E19 combination meter assembly connector.
2. Disconnect the E2 light control rheostat connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E19-26 (SW1) - E2-7 (T)	Always	Below 1 Ω
   E19-27 (SW2) - E2-3 (RV)
   E19-30 (TC) - E2-5 (TC)
   E19-34 (SW3) - E2-1 (E)
   E19-26 (SW1) - Body ground	Always	10 kΩ or higher
   E19-27 (SW2) - Body ground
   E19-30 (TC) - Body ground
   E19-34 (SW3) - Body ground

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4