Diagnosis And Testing - Blower Motor

WARNING:

Disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to take the proper precautions may result in accidental airbag deployment and possible serious or fatal injury.

NOTE:

See Appropriate Wiring Information for circuit descriptions and diagrams.

Possible causes of an inoperative blower motor include:

Open fuse
Inoperative blower motor power module
Inoperative blower motor
Inoperative blower motor switch
Inoperative A/C heater control in the Integrated Center Stack (ICS) module
Inoperative Heating, Ventilation and Air Conditioning (HVAC) module
Blower motor circuit wiring or wire harness connectors

Possible causes of the blower motor not operating in all speeds include:

Inoperative blower motor power module
Inoperative blower motor switch
Inoperative A/C heater control in the ICS module
Inoperative blower motor circuit wiring or wire harness connectors