The only way to test the switch is to take it out of the dashboard and disconnect it.
Using a multimeter set to continuity, (yellow circle), or Ohm's, (Green circle), place the black probe to one terminal and the red to another. Move the red to each of the other terminals in turn watching the meter display. Move the black probe and repeat moving the red probe. Do this for all the terminals on the switch, in all of the switches positions.
If the switch position is working you will get either a tone or numbers on the display. If the switch position is closed OR faulty you will not get a tone and the display will show 'O.L' (means open line).
The off position will always give you no tone, ( displays O.L) . A single action switch will give you only one pair of terminals as a tone, (displays numbers). A twin switch will give you two pairs of terminals as a tone, (displays numbers).
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