Diagnosis And Testing - Blower Motor

Any diagnosis of the blower motor should begin with the use of a diagnostic scan tool. Check for any Diagnostic Trouble Code (DTC) data. If a DTC is found, refer to the appropriate HVAC diagnostic information and perform the appropriate diagnostic procedure before proceeding in this section. Refer DTC INDEX (1 OF 2) or DTC INDEX (2 OF 2) .

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:

For circuit descriptions and diagrams, refer to Air Conditioning/Heater in Wiring Information.

BLOWER MOTOR DIAGNOSTIC TABLE
CONDITION	POSSIBLE CAUSES	CORRECTION
BLOWER MOTOR INOPERATIVE	1. Fuse inoperative.	Check blower motor fuse. Replace as necessary.
	2. Blower motor relay inoperative.	Check blower motor relay. Replace as necessary.
	3. Wiring or connector issue.	Check Wiring Information. Refer to Air Conditioning/Heater in Wiring Information. Repair wiring or connector as necessary. For wiring repair, refer to STANDARD PROCEDURE . For connector repair, refer to REMOVAL or INSTALLATION .
	4. Inoperative blower motor power module	Check the blower motor power module for proper operation. Replace as necessary. Refer to MODULE, POWER, BLOWER MOTOR, REMOVAL .
	5. Inoperative blower motor	Check the blower motor for proper operation. Replace as necessary. Refer to MOTOR, BLOWER, REMOVAL .
	6. Inoperative A/C heater control	Check the A/C heater control for proper operation. Replace as necessary. Refer to CONTROL, A/C AND HEATER, REMOVAL .