RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN C (2002)
Blower Motor Switch: Testing and Inspection
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, 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 COULD RESULT IN AN ACCIDENTAL AIRBAG DEPLOYMENT AND
POSSIBLE PERSONAL INJURY.
1. Check for battery voltage at the fuse in the Power Distribution Center (PDC). 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 OFF position. Disconnect and isolate the battery negative cable. Remove the a/c heater control from the instrument
panel. Check for continuity between the ground circuit cavity of the a/c heater control wire harness connector and a good ground. There should be
continuity If OK, go to Step 3. If not OK, repair the open circuit to ground as required.
3. With the a/c heater control wire harness connector unplugged, place the a/c heater mode control switch knob in any position except the OFF
position. Check for continuity between the ground circuit terminal and each of the blower motor driver circuit terminals of the a/c heater control as
you move the blower motor switch knob to each of the four speed positions. There should be continuity at each driver circuit terminal in only one
blower motor switch speed position. If OK, test and repair the blower driver circuits between the a/c heater control connector and the blower
motor resistor as required. If not OK, replace the faulty a/c heater control unit.
