Installation; Description; Operation - Dodge Dakota Sport 2001 Service Manual

AN
BLOWER MOTOR RESISTOR BLOCK (Continued)
the correct resistor circuit to obtain the selected
blower motor speed.
With the blower motor switch in the lowest speed
position, the ground path for the motor is applied
through all of the resistor circuits. Each higher speed
selected with the blower motor switch applies the
blower motor ground path through fewer of the resis-
tor circuits, increasing the blower motor speed.
The blower motor resistor cannot be repaired and,
if faulty or damaged, it must be replaced.
DIAGNOSIS AND TESTING - BLOWER MOTOR
RESISTOR BLOCK
For circuit descriptions and diagrams, (Refer to
Appropriate Wiring Information).
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN AN ACCIDENTAL
AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
(1) Disconnect and isolate the battery negative
cable.
(2) Unplug the wire harness connector from the
blower motor resistor.
(3) Check for continuity between each of the
blower motor switch input terminals of the resistor
and the resistor output terminal. In each case there
should be continuity. If OK, repair the wire harness
circuits between the blower motor switch and the
blower motor resistor or blower motor as required. If
not OK, replace the faulty blower motor resistor.
REMOVAL - BLOWER MOTOR RESISTOR
BLOWER MOTOR RESISTOR
(1) Disconnect and isolate the battery negative
cable.
(2) From the passenger foot well area, remove the
two hex screws used to secure the blower motor
resistor.
(3) Unplug the front blower motor resistor from
the wire harness connector.
(4) Pull the front blower motor resistor and its
wire harness out of the plenum panel and through
the cowl plenum access hole far enough to access the
wire harness connector.
(5) Remove the front blower motor resistor from
the cowl plenum.

INSTALLATION

(1) Plug the blower motor resistor into the wire
harness connector.
(2) Install the blower motor resistor to the cowl
plenum panel by feeding the resistor and wire har-
ness back through the cowl plenum access hole.
(3) Install and tighten the two screws that secure
the resistor to the HVAC unit. Tighten the screws to
2.2 N·m (20 in. lbs.).
(4) Connect the battery negative cable.
BLOWER MOTOR SWITCH

DESCRIPTION

The heater-A/C blower motor is controlled by a four
position rotary-type blower motor switch, mounted in
the heater-A/C control panel. The switch allows the
selection of one of four blower motor speeds, but can
only be turned off by selecting the Off position with
the heater-A/C mode control switch knob.

OPERATION

The blower motor switch directs the blower motor
ground path through the mode control switch to the
blower motor resistor, or directly to ground, as
required to achieve the selected blower motor speed.
The blower motor switch cannot be repaired and, if
faulty or damaged, the entire heater-A/C control unit
must be replaced. The blower motor switch knob is
serviced separately.
DIAGNOSIS AND TESTING - BLOWER MOTOR
SWITCH
For circuit descriptions and diagrams, (Refer to
Appropriate Wiring Information).
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN AN ACCIDENTAL
AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
CONTROLS 24 - 21