Blower Motor Switch: Testing and Inspection

Current is supplied to ventilation fan switch 35 via fuse 3.

The ventilation fan switch controls the fan motor via resistor 74 and with the aid of the resistor it is possible to obtain four different fan speeds.
^ Position 1: Entire resistor in circuit (2.6 ohms + 0/-20%).
^ Position 2: Two-thirds of the resistor in circuit (1.19 ohms + 0/-20%).
^ Position 3: One-third of the resistor in circuit (0.31ohms + 0/-20%).
^ Position 4: No part of the resistor in circuit.