Operating Light Control Rheostat does not Change Light Brightness: Procedure

1. Operate the Techstream according to the display and select "Data List". Refer to DATA LIST / ACTIVE TEST .

   OK

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

   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	Rheostat value/ Min.: 0 Max.: 100	Light control rheostat switch is Dark (0) → Bright (100)	Unit: %

NG → See step   2 

OK → See step   5 

1. Inspect the light control rheostat. Refer to INSPECTION .

NG → See step   6 

OK: Go to next step 

1. Disconnect the D100 combination meter assembly connector.
2. Disconnect the D121 light control rheostat connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D100-37 (SW1) - D121-7 (T)	Always	Below 1 Ω
   D100-36 (SW2) - D121-3 (RV)	Always	Below 1 Ω
   D100-33 (SW3) - D121-1 (E)	Always	Below 1 Ω
   D100-17 (TC) - D121-5 (TC)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4