The resistor or control module will be next to the blower motor on the HVAC case...
Resistors are used on manual systems,control modules are used on Auto climate controlled systems..
Tap on the blower MOTOR itself not the resistor,if it makes a noise or comes to life,then replace the motor.
If the lower speeds have been out,then you will have to also replace either the resistor or the control module, based on what system you have.
Click link below