Page 2457 of 3171
MTC-70
TROUBLE DIAGNOSIS
3.CHECK POWER SUPPLY CIRCUIT FOR INTAKE DOOR MOTOR
1. Turn ignition switch OFF.
2. Disconnect front air control connector and intake door motor
connector.
3. Check continuity between front air control harness connector
M98 terminal 5 and intake door motor connector M86 terminal 6
and between front air control harness connector M98 terminal 4
and intake door motor connector M86 terminal 1.
OK or NG
OK >> Replace intake door motor. Refer toMTC-109, "INTAKE
DOOR MOTOR".
NG >> Repair or replace harness as necessary.5 - 6 Continuity should exist.
4 - 1 Continuity should exist.
MJIB0239E
Page 2458 of 3171
TROUBLE DIAGNOSIS
MTC-71
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Blower Motor CircuitEJS005GI
SYMPTOM:
lBlower motor operation is malfunctioning.
lBlower motor operation is malfunctioning under cold starting conditions.
INSPECTION FLOW
*1MTC-53, "Operational Check".*2MTC-51, "A/C System Self-diagno-
sis Function".*3MTC-52, "
SELF-DIAGNOSIS CODE
CHART".
*4MTC-73, "
DIAGNOSTIC PROCE-
DURE FOR BLOWER MOTOR".
MJIB0240E
Page 2459 of 3171
MTC-72
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
lFront air control
lBlower switch
lBlower motor resistor
lBlower motor
lBlower motor relay
System Operation
Blower Speed Control Specification
COMPONENT DESCRIPTION
Blower Motor Resistor
The blower motor resistor is located on the cooling unit. The blower
motor resistor grounds the blower motor through a series of 1, 2, or
three resistors, depending upon speed selected. For high speed
operation the blower motor resistor is circumvented and the blower
motor grounds directly.
NOTE:
This illustration is for LHD models.
The layout for RHD models is symmetrically opposite.
MJIB0324E
WJIA0441E
MJIB0195E
Page 2460 of 3171
TROUBLE DIAGNOSIS
MTC-73
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DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning.
1.DIAGNOSTIC PROCEDURE
Turntheblowerswitchtoeachofitsfourspeeds.
Does blower motor rotate normally at each speed?
OK or NG
OK >> INSPECTION END.
NG >> 1. Does not rotate at any speed, GO TO 2.
2. Does not rotate at 1 - 3 speed, GO TO 13.
3. Does not rotate at 4 speed, GO TO 16.
2.CHECK FUSES
Check 15A fuses [Nos. 24 and 27, located in the fuse and fusible link box]. Refer toPG-84, "
FUSE AND FUS-
IBLE LINK BOX".
OK or NG
OK >> GO TO 3.
NG >> GO TO 8.
3.CHECK BLOWER MOTOR POWER SUPPLY
1. Disconnect blower motor harness connector.
2. Select any blower speed except OFF.
3. Check voltage between blower motor harness connector M94
terminal 2 and ground.
OK or NG
OK >> GO TO 11.
NG >> GO TO 4.
MJIB0105E
2 - Ground : Battery voltage
MJIB0065E
Page 2461 of 3171

MTC-74
TROUBLE DIAGNOSIS
4.CHECK BLOWER MOTOR RELAY
Refer toMTC-77, "
Blower Motor Relay".
OK or NG
OK >> GO TO 5.
NG >> Replace blower motor relay.
5.CHECK BLOWER MOTOR POWER FROM RELAY TO BLOWER MOTOR
1. Reconnect blower motor harness connector.
2. Disconnect blower motor relay.
3. Connect a jumper wire between blower motor relay connector
E28 terminals 3 and 5 and between blower motor relay connec-
tor E28 terminals 6 and 7.
4. Momentarily (no more than 4 seconds), set blower switch to any
position except OFF.
OK or NG
OK >> GO TO 6.
NG >> GO TO 10.
6.CHECK BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY CIRCUIT
1. Turn ignition key ON.
2. Set blower switch to any position except OFF.
3. Check voltage between blower motor relay harness connector
E28 terminal 1 and ground.
OK or NG
OK >> GO TO 7.
NG >> Repair harness or connector.
7.CHECK BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT
Check continuity between blower motor relay harness connector E28 terminal 2 and ground.
OK or NG
OK >> Replace blower motor relay.
NG >> Repair harness or connector.
8.REPLACE FUSE
Refer toPG-84, "
FUSE AND FUSIBLE LINK BOX".
Does fuse open when blower motor is turned on?
YESorNO
YES >> GO TO 9.
NO >> INSPECTION END.Blower motor should rotate.
MJIB0106E
1 - Ground : Battery voltage.
WJIA0504E
2 - Ground Continuity should exist.
WJIA0505E
Page 2462 of 3171

TROUBLE DIAGNOSIS
MTC-75
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MTC
9.CHECK BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1. Disconnect blower motor harness connector.
2. Check continuity between blower motor harness connector M94
terminal 2 and ground.
OK or NG
OK >> Check blower motor. Refer toMTC-77, "Blower Motor".
NG >> Repair harness or connector.
10.CHECK BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT
1. Disconnect blower motor harness connector.
2. Check continuity between blower motor relay harness connector
E28 terminal 5 and 7 and blower motor harness connector M94
terminal 2.
OK or NG
OK >> Repair harness or connector between blower motor
fuses and blower motor relay.
NG >> Repair harness or connector between blower motor
relay and blower motor.
11 .CHECK BLOWER MOTOR
Refer toMTC-77, "
Blower Motor".
OK or NG
OK >> GO TO 12.
NG >> Replace blower motor.
12.CHECK BLOWER SWITCH
Refer toMTC-77, "
Blower Switch".
OK or NG
OK >> Repair harness or connector between blower switch and blower motor.
NG >> Replace front air control. Refer toMTC-98, "
CONTROL UNIT".
13.CHECK BLOWER MOTOR RESISTOR
Refer toMTC-78, "
Blower Motor Resistor".
OK or NG
OK >> GO TO 14.
NG >> Replace blower motor resistor. Refer toMTC-112, "
BLOWER MOTOR RESISTOR". 2 - Ground : Continuity should not exist.
WJIA0649E
5, 7 - 2 : Continuity should exist.
MJIB0067E
Page 2463 of 3171

MTC-76
TROUBLE DIAGNOSIS
14.CHECK BLOWER SWITCH CIRCUIT
1. Reconnect blower motor resistor harness connector.
2. Check voltage between blower switch connector M59 terminals
2, 3, and 7 and ground.
OK or NG
OK >> Replace front air control. Refer toMTC-98, "CONTROL UNIT".
NG >> GO TO 15.
15.CHECK BLOWER MOTOR GROUND CIRCUIT TO BLOWER MOTOR RESISTOR
1. Disconnect blower motor and blower motor resistor harness
connector.
2. Check continuity between blower motor connector M94 terminal
1 and blower motor resistor harness connector M95 terminal 3.
3. Check continuity between blower motor connector M94 terminal
1 and ground.
OK or NG
OK >> INSPECTION END.
NG >> Repair harness or connector.
16.CHECK BLOWER SWITCH
Refer toMTC-77, "
Blower Switch".
OK or NG
OK >> Repair harness or connector.
NG >> Replace front air control. Refer toMTC-98, "
CONTROL UNIT".
Terminal No.
Voltage
(Approx.)
+-
2
Ground 12V 3
7
M J I B 0 111 E
1 - 3 : Continuity should exist.
1 - Ground : Continuity should not exist.
WJIA0647E
Page 2464 of 3171
TROUBLE DIAGNOSIS
MTC-77
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COMPONENT INSPECTION
Blower Motor Relay
Check continuity between terminals by supplying 12 volts and
ground to coil side terminals of relay.
Blower Motor
Confirm smooth rotation of the blower motor.
lEnsure that there are no foreign particles inside the blower unit.
lApply 12 volts to terminal + and ground to terminal - and verify
that the motor operates freely and quietly.
Blower Switch
Check continuity between terminals at each switch position.
LJIA0068E
WJIA0595E
WJIA0508E