Rear

BLOWER MOTOR INOPERATIVE
For circuit descriptions and diagrams, refer to the appropriate wiring information. The wiring information includes wiring, diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

BLOWER MOTOR ELECTRICAL DIAGNOSIS
1. Check the fuse (Fuse 12 - 25 ampere) in the Integrated Power Module (IPM). If OK, go to Step 2. If not OK, repair the shorted circuit or component as required and replace the faulty fuse.
2. Turn the ignition switch to the On position. Be certain that the rear A/C-heater control power is turned on. Check for battery voltage at the fuse (Fuse 12 - 25 ampere) in the IPM. If OK, go to Step 3. If not OK, check the rear blower motor relay.
3. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Disconnect the rear HVAC wire harness connector from the rear blower motor resistor block (Manual Temperature Control) or the rear blower motor power module (Automatic Temperature Control). Reconnect the battery negative cable. Turn the ignition switch to the On position. Be certain that the rear A/C heater control power is turned on. Check for battery voltage at the fused rear blower motor relay output circuit cavity of the rear HVAC wire harness connector for the rear blower motor resistor block (MTC) or the rear blower motor power module (ATC). If OK, go to Step 4. If not OK, repair the open fused front blower motor relay output circuit to the IPM as required.
4. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Disconnect the rear blower motor pigtail wire connector from the rear HVAC wire harness (MTC) or the rear blower power module (ATC). Use jumper wires to connect a battery and ground feeds to the blower motor pigtail wire connector. The rear blower motor should operate. If OK with MTC, proceed to diagnosis of the rear blower motor resistor block. If OK with ATC, use a DRBIII scan tool to diagnose the rear blower motor power module. Refer to the appropriate diagnostic information. If not OK with MTC or ATC, replace the faulty rear blower motor.

Blower Motor Noise/Vibration Diagnosis:

BLOWER MOTOR NOISE OR VIBRATION
Refer to the Blower Motor Noise/Vibration Diagnosis chart for basic checks of the blower motor when a vibration or noise is present.