B2300 SE Regular Cab 2WD L4-2.3L VIN A (1997)
Blower Motor Switch: Testing and Inspection
1. Using an ohmmeter or self-powered test light, check for continuity between the terminals called out in the chart below.
2. If the switch does not pass the continuity test, replace the switch.
Open Circuit Test
The heater blower motor switch and heater blower motor switch resistor are connected between the blower motor and ground. Battery voltage is
available at the blower motor whenever the ignition switch is ON.
On all electrical circuits, continuity must exist between the source of power (battery), to the unit where the power is used and back up to the source of
power (ground). A check at each connection in a circuit, starting at the battery, will locate an open circuit or will show that the circuit is complete.
Refer to the electrical schematic.
An ohmmeter or self-powered test lamp connected at any two points of a circuit with the power removed from the circuit will show if the circuit
between the two connections is open or continuous.
If the meter does not move or has a slight movement (high resistance), the circuit may have a poor connection or broken wire. If the bulb does not
light, the circuit is open.
If the meter movement is great or full (low resistance), the circuit is complete. If the bulb lights, the circuit is continuous.
