Symptom Chart
DIAGNOSTIC TABLE
PROCEDUREPrelimi-
nary
Check Diagnostic
Procedure Main Power
Supply and
Ground Circuit Check Electrical Components Inspection
SYMPTOM
Preliminary check 1
Preliminary check 2
Diagnostic procedure 1
Diagnostic procedure 2
Diagnostic procedure 3
15A Fuses
10A Fuse
15A Fuse
Blower motor
Intake door motor
Resistor
A/C switch
Fan switch
A/C relay
Dual-pressure switch Compressor
Harness Magnet clutch
A/C does not blow cold air.q qqqq qqqqqqq
Blower motor does not rotate.
qqqqq q
Magnet clutch does not
engage when A/C switch and
fan switch are ON.
qq qqqqqq
Noise
Intake door does not change.qq q
,: The number indicates checking order.
q: Refer to each flow chart for checking order. (It depends on malfunctioning portion.)
TROUBLE DIAGNOSES
HA-37
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Diagnostic Procedure 1
SYMPTOM: Blower motor does not rotate.
IPerform PRELIMINARY CHECK 2 before referring to the
following flow chart.
Check if blower motor rotates properly at
each fan speed.
Conduct check as per flow chart at left.234EqB5EqC
(Go to next page.)
1
CHECK POWER SUPPLY FOR BLOWER
MOTOR.
I
Disconnect blower motor harness con-
nector.
I Turn ignition switch to ACC or ON posi-
tion.
Do approx. 12 volts exist between blower
motor harness terminal No. q
1and body
ground?
OK
ENG Check 15A fuses at fuse
block.
(Refer to ªPOWER SUP-
PLY ROUTINGº in EL sec-
tion and ªWiring Diagramº.)
IPut fan switch to ON position.
Check circuit continuity between blower
motor harness terminal No. q
2and body
ground.
OK
ENG Reconnect blower motor
harness connector.
CHECK BLOWER MOTOR.
(Refer to Electrical Components
Inspection, HA-61.)
NG
Replace blower motor.
CHECK BLOWER MOTOR CIRCUIT
BETWEEN BLOWER MOTOR AND
RESISTOR.
I Put fan switch to OFF position.
Do approx. 12 volts exist between resistor
harness terminal No. q
1and body ground?
OK
ENG
Disconnect blower motor
and resistor harness con-
nectors.
Note
I Turn ignition switch OFF.
Check circuit continuity
between blower motor har-
ness terminal No. q
2and
resistor harness terminal
No. q
1.
qA
(Go to next page.)Note:
If the result is NG after checking circuit continuity, repair har-
ness or connector.
INCIDENT Flow chart
No.
1 Fan fails to rotate.
1
2 Fan does not rotate at
1-speed.2
3Fan does not rotate at
2-speed.3
4Fan does not rotate at
3-speed.4
5Fan does not rotate at
4-speed.5
YHA408
YHA409
YHA410
YHA411
H
H
H
H
H
H
TROUBLE DIAGNOSES
HA-53
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