Page 2985 of 3189
10 CHECK FAN SWITCH CIRCUIT
1. Reconnect blower motor connector.
2. Do approx. 12 volts exist between each fan switch harness terminal and body ground?
NHA507
YesorNo
Yes GO TO 13.
No GO TO 11.
11 CHECK CIRCUIT CONTINUITY BETWEEN HEATER CONTROL PANEL AND RESISTOR
Check circuit continuity between heater control panel harness terminalsand fan resistor harness terminals.
NHA508
Continuity should exist.
If OK, check harness for short.
OK or NG
OK GO TO 12.
NG Repair harness or connector.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSESMANUAL
Blower Motor (Cont’d)
HA-49
Page 2986 of 3189
12 CHECK CIRCUIT CONTINUITY BETWEEN HEATER CONTROL PANEL AND BLOWER MOTOR
Check circuit continuity between heater control panel harness terminal No. 17 and blower motor harness terminal No. 2.
NHA509
Continuity should exist.
If OK, check harness for short.
OK or NG
OK GO TO 13.
NG Repair harness or connector.
13 CHECK FAN SWITCH AFTER DISCONNECTING IT
(Refer to Electrical Components Inspection.)
(HA-51)
OK or NG
OK INSPECTION END
NG Replace fan switch.
TROUBLE DIAGNOSESMANUAL
Blower Motor (Cont’d)
HA-50
Page 2987 of 3189
NHA386
ELECTRICAL COMPONENTS INSPECTION=NJHA0146Fan SwitchNJHA0146S01Check continuity between terminals at each switch position.
KNOB POSITION Continuity between terminals
OFF No continuity
113—14—18
213—15—18
313—16—18
413—17—18
Blower MotorNJHA0146S02Confirm smooth rotation of the blower motor.
Ensure that there are no foreign particles inside the intake unit.
RHA706H
Blower ResistorNJHA0146S03Check resistance between terminals.
Terminal No.
Resistance
(+) (−)
4
1Approx. 1.8 - 2.2Ω
3 Approx. 0.45 - 0.55Ω
2 Approx. 0.18 - 0.22Ω
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSESMANUAL
Blower Motor (Cont’d)
HA-51
Page 2988 of 3189
Magnet Clutch
TROUBLE DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH=NJHA0155SYMPTOM:
Magnet clutch does not operate when A/C switch and fan switch are ON.
INSPECTION FLOW
NHA387
*1: HA-92
*2: HA-53 (QG and YD engine with
common rail), HA-60 (YD engine
without common rail)*3: HA-35
*4: HA-34*5: EM-11 (QG),
EM-11 (YD)
TROUBLE DIAGNOSESMANUAL
Magnet Clutch
HA-52
Page 2989 of 3189
MAGNET CLUTCH CIRCUIT (QG ENGINE AND YD
ENGINE WITH COMMON RAIL)
=NJHA0156SYMPTOM:
Magnet clutch does not engage when A/C switch and fan
switch are ON.
1 CHECK POWER SUPPLY FOR COMPRESSOR
Disconnect compressor harness connector.
Do approx. 12 volts exist between compressor harness terminal No. 1 and body ground?
RHA794H
YesorNo
Ye s G O T O 2 .
No Disconnect A/C relay. GO TO 3.
2 CHECK MAGNET CLUTCH COIL
Check for operation sound when applying battery voltage direct current toterminal.
RHA256I
OK or NG
NG Replace magnet clutch. Refer to HA-84.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSESMANUAL
Magnet Clutch (Cont’d)
HA-53
Page 2990 of 3189
3 CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY AND COMPRESSOR HARNESS
Check circuit continuity between A/C relay harness terminal No. 3 and compressor harness terminal No. 1.
RHA634H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK GO TO 4.
NG Repair harness or connector.
4 CHECK POWER SUPPLY FOR A/C RELAY
Disconnect A/C relay.
Do approx. 12 volts exist between A/C relay harness terminal Nos. 1, 5 and body ground?
RHA635H
YesorNo
Ye s G O T O 5 .
No Check power supply circuit and 10A (No. 15) fuse at fuse block. Refer to EL-14, “Wiring
Diagram — POWER —”.
5 CHECK A/C RELAY AFTER DISCONNECTING IT
Refer to HA-65.
OK or NG
OK Reconnect A/C relay. GO TO 6.
NG Replace A/C relay.
TROUBLE DIAGNOSESMANUAL
Magnet Clutch (Cont’d)
HA-54
Page 2991 of 3189
6 CHECK COIL SIDE CIRCUIT OF A/C RELAY
Do approx. 12 volts exist between smart entrance control unit harness terminal No. 41 and body ground?
RHA257I
YesorNo
Ye s G O T O 8 .
No Disconnect A/C relay. Disconnect smart entrance control unit harness connector. GO TO
7.
7 CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY AND SMART ENTRANCE CONTROL UNIT HAR-
NESS
Check circuit continuity between A/C relay harness terminal No. 2 and smart entrance control unit harness terminal No.
41.
RHA258I
Continuity should exist.
If OK, check harness for short.
OK or NG
OK Check smart entrance control unit. Refer to EL-368.
NG Repair harness or connector.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSESMANUAL
Magnet Clutch (Cont’d)
HA-55
Page 2992 of 3189
8 CHECK VOLTAGE FOR COMBINATION METER (FAN ON SIGNAL)
Do approx. 12 volts exist between combination meter harness terminal No. 45 and body ground?
RHA259I
YesorNo
Yes QG engine: GO TO 9.
YD engine: GO TO 10.
No Check combination meter. Refer to EL-110.
9 CHECK REFRIGERANT PRESSURE SENSOR
Refer to HA-65.
OK or NG
OK GO TO 10.
NG Replace refrigerant pressure sensor.
10 CHECK A/C SWITCH
Refer to HA-65.
OK or NG
OK GO TO 11.
NG Replace heater control panel.
11 CHECK POWER SUPPLY FOR HEATER CONTROL PANEL (A/C SWITCH)
Do approx. 12 volts exist between heater control panel harness terminal No. 7 and body ground?
RHA260I
YesorNo
Yes GO TO 16.
No QG engine: GO TO 12.
YD engine: GO TO 13.
TROUBLE DIAGNOSESMANUAL
Magnet Clutch (Cont’d)
HA-56