Page 2649 of 3051
6 CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND RESISTOR
Check circuit continuity between blower motor harness terminal No. 2 and fan resistor harness terminal No. 1.
NHA414
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©Poor contact between the resistor and blower motor connector.
NG©Repair harness or connector.
7 CHECK GROUND CIRCUIT FOR HEATER CONTROL PANEL
Check circuit continuity between fan switch harness terminal No. 13 and body ground.
NHA415
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 8.
NG©Repair harness or connector.
8 CHECK RESISTOR AFTER DISCONNECTING IT
(Refer to Electrical Components Inspection.)
(HA-61)
OK or NG
OK©GO TO 9.
NG©Replace resistor.
9 CHECK RESISTOR HARNESS CONNECTOR
Reconnect resistor harness connector.
OK or NG
1©GO TO 12.
2, 3, 4©GO TO 10.
TROUBLE DIAGNOSES
Blower Motor (Cont’d)
HA-58
Page 2650 of 3051
10 CHECK FAN SWITCH CIRCUIT
Do approx. 12 volts exist between each fan switch harness terminal and body ground?
NHA416
YesorNo
Ye s©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 terminals and fan resistor harness terminals.
NHA417
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 12.
NG©Repair harness or connector.
TROUBLE DIAGNOSES
Blower Motor (Cont’d)
HA-59
Page 2651 of 3051
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.
NHA418
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-61)
OK or NG
OK©INSPECTION END
NG©Replace fan switch.
TROUBLE DIAGNOSES
Blower Motor (Cont’d)
HA-60
Page 2652 of 3051
NHA386
ELECTRICAL COMPONENTS INSPECTION=NLHA0146Fan SwitchNLHA0146S01Check 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 MotorNLHA0146S02Confirm smooth rotation of the blower motor.
+Ensure that there are no foreign particles inside the intake unit.
RHA706H
Blower ResistorNLHA0146S03Check resistance between terminals.
Terminal No.
Resistance
(+) ( )
4
1Approx. 2.4 - 2.8Ω
3 Approx. 0.58 - 0.7Ω
2 Approx. 0.22 - 0.26Ω
TROUBLE DIAGNOSES
Blower Motor (Cont’d)
HA-61
Page 2653 of 3051
Magnet Clutch
TROUBLE DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH=NLHA0155SYMPTOM:
+Magnet clutch does not operate when A/C switch and fan switch are ON.
INSPECTION FLOW
NHA387
*1: HA-100
*2: HA-63*3: HA-41
*4: HA-40*5: EM-17 (QG), EM-166 (YD),
EM-86 (SR)
TROUBLE DIAGNOSES
Magnet Clutch
HA-62
Page 2654 of 3051
MAGNET CLUTCH CIRCUIT (FOR QG AND SR ENGINE)=NLHA0156SYMPTOM:
+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?
NHA419
YesorNo
Ye s©GO TO 2.
No©Disconnect A/C relay. GO TO 3.
2 CHECK MAGNET CLUTCH COIL
OK or NG
NG©Replace magnet clutch. Refer to HA-92
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.
NHA420
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 4.
NG©Repair harness or connector.
TROUBLE DIAGNOSES
Magnet Clutch (Cont’d)
HA-63
Page 2655 of 3051
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©GO TO 5.
No©Check power supply circuit and 10A (No. 15) fuse at fuse block. Refer to EL-10,“Wiring
Diagram—POWER—”.
5 CHECK A/C RELAY AFTER DISCONNECTING IT
Refer to HA-73.
OK or NG
OK©Reconnect A/C relay. GO TO 6.
NG©Replace A/C relay.
6 CHECK COIL SIDE CIRCUIT OF A/C RELAY
Do approx. 12 volts exist between ECM harness terminal No. 23 and body ground?
NHA421
YesorNo
Ye s©GO TO 8.
No©Disconnect A/C relay. Disconnect ECM harness connector. GO TO 7.
TROUBLE DIAGNOSES
Magnet Clutch (Cont’d)
HA-64
Page 2656 of 3051
7 CHEC KCIRCUI TCONTINUIT YBETWEE NA/C REL AY AN DEC MHARNESS
NHA422
8 CHEC KVO LTAG EFO RECM
NHA423
9 CHEC KREFRIGERAN TPRESSUR ESENSOR
Magne tClutc h(Cont ’d)