To troubleshoot the blower motor, start by checking the fuse and circuit connections for looseness or corrosion. Ensure the battery is fully charged and, with the ignition in the On position, switch the heater controls to FLOOR and test the blower at different speeds. The blower motor resistor assembly, mounted next to the blower motor, contains resistor elements for low and medium speeds. Visually check the thermal limiter for damage and test the resistor block for continuity; replace if necessary. Backprobe the pink/white wire at the blower motor for voltage. If voltage is present but the blower doesn't operate, check the ground circuit. Test the blower speed switch for continuity in different positions. Locate the blower motor relay behind the right headlight and check resistance; replace if needed. For models with a rear air circulation unit, remove the console trim, disconnect electrical connectors, and pull the console and blower housing out to access the blower motor for the rear seats.