Dodge ZB 2005 Service Manual page 1051

24 - 22 CONTROLS
BLOWER MOTOR RESISTOR BLOCK (Continued)
Fig. 18 Blower Motor Resistor
1 - MOUNTING PLATE
2 - WIRE HARNESS CONNECTOR
3 - CERAMIC HEAT SINK
blower motor speed. When the blower motor control
is in the highest speed position, the blower motor
resistor is bypassed and the blower motor receives a
direct path to ground.
The blower motor resistor cannot be adjusted or
repaired and, if faulty or damaged, it must be
replaced.
DIAGNOSIS AND TESTING
BLOWER MOTOR RESISTOR
WARNING: On vehicles equipped with airbags, dis-
able the airbag system before attempting any steer-
ing wheel, steering column, or instrument panel
component diagnosis or service. Disconnect and
isolate the negative battery (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 air-
bag system. Failure to take the proper precautions
could result in accidental airbag deployment and
possible personal injury or death.
NOTE: 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.
(1) Disconnect and isolate the negative battery
cable.
(2) Disconnect the wire harness connector from the
blower motor resistor (Refer to 24 - HEATING & AIR
CONDITIONING/CONTROLS/BLOWER
RESISTOR - REMOVAL).
(3) Using an ohmmeter, check for continuity
between all of the blower motor resistor terminals. 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
WARNING: On vehicles equipped with airbags, dis-
able the airbag system before attempting any steer-
ing 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 air-
bag system. Failure to take the proper precautions
could result in an accidental airbag deployment and
possible personal injury or death.
WARNING: The blower motor resistor may get very
hot during normal operation. If the blower motor
was turned on prior to servicing the blower motor
resistor, wait five minutes to allow the blower motor
resistors to cool before performing diagnosis or
service. Failure to take this precaution can result in
possible personal injury.
(1) Disconnect and isolate the negative battery
cable.
(2) Reach under the instrument panel near the
blower motor and disconnect the wire harness con-
nector from the blower motor resistor (Fig. 19).
(3) Remove the two screws that secure the blower
motor resistor to the bottom of the HVAC housing
and remove the resistor.
ZB
MOTOR