Dimmer Switch: Testing and Inspection

W/ Tachometer (DLX Grade M/T Vehicle) INSPECT LIGHT CONTROL RHEOSTAT
a. Turn the rheostat knob OFF and check that no continuity exists between terminals (Rheostat knob turned to fully counterclockwise).
b. Gradually, turn the rheostat knob from the dark side to bright side and check that the resistance decreases from 10 to 0 Ohm. (Rheostat knob turned to clockwise)
If operation is not as specified, replace the rheostat.




ELECTRICAL TYPE (W/ All A/T Vehicle and SR5 Grade M/T Vehicle):
INSPECT LIGHT CONTROL RHEOSTAT
a. Connect terminals 1 and 3 through a 3.4 W test bulb.
b. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2.
c. Turn the rheostat knob to fully counterclockwise and check that the test bulb goes out.
d. Gradually turn the rheostat knob to clockwise and check that the test bulb brightness changes from dark to bright.
If operation is not as specified, replace the rheostat.