Chrysler DODGE D150 1993 Service Manual page 1442

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HEATING AND AIR CONDITIONING 24 - 5
HEATER BLOWER MOTOR / CONTROL SYSTEM DIAGNOSIS (ELECTRICAL)
BLOWER MOTOR
INOPERATIVE
]
[
I N S P E C T F U S E I - -*JT
FUSE L O O K S GOOD
CHECK FOR
STALLED MOTOR
MOTOR
STALLED
REPLACE
MOTOR
REPLACE
FUSE
MOTOR
O.K.
CHECK FOR
SHORT
CORRECT
SHORT
REPLACE
FUSE
MOTOR
O.K.
CHECK FOR
SHORT
CORRECT
SHORT
REPLACE
FUSE
h
VOLTAGE AT BOTH
ENDS OF FUSE
CHECK FOR BATTERY VOLTAGE
AT BOTH ENDS OF FUSE
VOLTAGE AT BATTERY
SIDE OF FUSE ONLY
ATTACH JUMPER WIRE BETWEEN MOTOR GROUND WIRE A N D BODY OR ENGINE
MOTOR
RUNS
LOCATE A N D CORRECT
OPEN CONNECTION
CHECK BLOWER REPLACE
MOTOR GROUND FUSE
MOTOR DOES
NOT RUN
CHECK MOTOR CONTINUITY
IF MOTOR DOES
NOT RUN
REPLACE MOTOR
MOTOR RUNS
ATTACH JUMPER WIRE FROM THE MOTOR FEED WIRE TO THE
POSITIVE POST OF THE BATTERY. MAKE SURE THAT
MOTOR GROUND WIRE IS PROPERLY GROUNDED FOR THIS
TEST. REASSEMBLE MOTOR WIRE CONNECTOR.
MAKE SURE FEED
WIRE TERMINALS ARE
NOT BACKED OUT OF
INSULATOR OR OFF
CENTER
CHECK RESISTOR
CONTINUITY A N D
RESISTOR CONNECTIONS
VOLTAGE AT
BATTERY LEAD
CONNECTOR
REMOVE WIRING CONNECTORS FROM RESISTOR TERMINALS.
MAKE SURE THAT TERMINALS ARE NOT BACKED OUT OF INSULATOR.
CHECK FOR BATTERY VOLTAGE IN EACH FAN SWITCH POSITION.
REPLACE
SLOWER
SWITCH*
VOLTAGE IN
ALL SWITCH
POSITIONS
CHECK BLOWER SWITCH N O VOLTAGE IN ONE OR
REPLACE
A N D CONNECTIONS
MORE SWITCH POSITIONS RESISTOR
REMOVE WIRING CONNECTOR FROM SWITCH TERMINALS. MAKE
SURE THE TERMINALS ARE PROPERLY LOCKED IN SOCKETS OF
INSULATOR. CHECK FOR BATTERY VOLTAGE AT BATTERY CONNECTOR IN
THE INSULATOR.
BLOWER MOTOR
DOES NOT OPERATE
AT ALL SPEEDS
tfEl
J
RESISTOR
BLOCK O.K.
CHECK WIRING
CONNECTIONS AT
RESISTOR BLOCK
AND BLOWER
SWITCH
IF DEFECTIVE,
REPLACE
BLOWER SWITCH
INSPECT
BLOWER SWITCH
INSPECT
RESISTOR
BLOCK
RESISTOR BLOCK DEFECTIVE
REPLACE RESISTOR BLOCK
*IF BLOWER SWITCH HAS FAILED DUE TO BURNING OR CHARRING,
CHECK CURRENT DRAW OF THE BLOWER MOTOR.
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