Page 1897 of 2267
WITH GA ENGINE or DIESEL ENGINE
YHA343
To HA-A/C-05
DUAL-PRESSURE
SWITCH
AIR
CONDITIONER
RELAY
To HA-A/C-09
IACV-FICD
SOLENOID
VA LV E THERMAL
PROTECTOR
Hi-
temp Lo-
temp
COMPRESSOR
REFER TO THE FOLLOWING
ELECTRICAL UNITS
ELECTRICAL UNITS
: This connector is not shown in ªHARNESS LAYOUTº of EL section.: With GA engine
: With diesel engine
ECM LOW HIGH
NORMAL
TROUBLE DIAGNOSESAUTO
Wiring Diagram Ð A/C Ð (Cont'd)
HA-48
Page 1898 of 2267
WITH GASOLINE ENGINE
YHA235
BR
17C
G
BR G
LG/R G/B23
15
G/B G/B
1*
LG/R
RFRL
ECM
2*
LG/R
LG/R
: 7
: 41
*
: E65
: E42
: F70
:F4:
:
BR12
BR
5H
,
2*: 13
: 9
GYGY
BRBB,GY,B
M1
HA-A/C-08
10A
11
21
E19
M
B
M140A
f
E45
21
M
BE28
B
E11B
E37 SQ
GA GA
SQ
F101
GA SQ
GA SQ
SQ
E94
GA M70
E125
SQ GA
GA
SQE127
SQ
GA
12
7 64
9 3
85 12
7 64
9 3
85
10F70 F43 2 14567
8
10911 12 13 14 15 16E125E45
2 1E19 E28 E94E127
F1013
12
5
IGNITION SWITCH
ON or START
FUSE BLOCK
(J/B)BATTERY
Refer to EL-POWER.
COOLING
FA N
RELAY-1
COOLING
FA N
MOTOR-2 COOLING
FA N
MOTOR-1
REFER TO THE FOLLOWING
FUSE BLOCK - Junction Box (J/B)
FUSE BLOCK - Junction Box (J/B)
ELECTRICAL UNITS : With GA engine
: With SR engine or QG engine
TROUBLE DIAGNOSESAUTO
Wiring Diagram Ð A/C Ð (Cont'd)
HA-49
Page 1899 of 2267
WITH DIESEL ENGINE
YHA344
IGNITION SWITCH
ON or START
FUSE
BLOCK (J/B)BATTERY
Refer to
EL-POWER
COOLING
FA N
MOTOR-1
COOLING
FA N
RELAY-2 COOLING
FA N
RELAY-1 COOLING
FA N
RELAY-3
To HA-A/C-07
TRIPLE-
PRESSURE
SWITCHCOOLING
FAN MOTOR-2
To HA-A/C-05
REFER TO THE FOLLOWING
FUSE BLOCK - Junction Box (J/B)
ELECTRICAL UNITS NORMAL
HIGH
LOWLOWHIGH
ECM
TROUBLE DIAGNOSESAUTO
Wiring Diagram Ð A/C Ð (Cont'd)
HA-50
Page 1900 of 2267

Main Power Supply and Ground Circuit
Check
POWER SUPPLY CIRCUIT CHECK FOR AUTO A/C
SYSTEM
Check power supply circuit for auto air conditioning system.
Refer to ªPOWER SUPPLY ROUTINGº in EL section and Wir-
ing Diagram.
A/C CONTROL PANEL
Check power supply circuit for A/C control panel unit with igni-
tion switch ON.
1. Disconnect A/C control panel harness connector.
2. Connect voltmeter from harness side.
3. Measure voltage across terminal No.
p1and body ground.
Voltmeter terminal
Voltage
!@
p1Body groundApprox. 12V
Check body ground circuit for A/C control panel with ignition
switch OFF.
1. Disconnect A/C control panel harness connector.
2. Connect ohmmeter from harness side.
3. Check for continuity between terminal No.
p2,p8,p14,p20
and body ground.
Ohmmeter terminal
Continuity
!@
p2
Body groundYe sp8
p14
p20
AUTO AMP. CHECK
Check power supply circuit for auto amp. with ignition switch ON.
1. Disconnect auto amp. harness connector.
2. Connect voltmeter from harness side.
3. Measure voltage across terminal No.
p1and body ground.
Voltmeter terminal
Voltage
!@
p1Body groundApprox. 12V
YHA237 A/C control panel con-
nector
YHA238 A/C control panel
connector
A/C control panel con-
nector
YHA239 Auto amp. connector
TROUBLE DIAGNOSESAUTO
HA-51
Page 1901 of 2267

Check body ground circuit for auto amp. with ignition switch OFF.
1. Disconnect auto amp. harness connector.
2. Connect ohmmeter from harness side.
3. Check for continuity between terminal No.
p17and body
ground.
Ohmmeter terminal
Continuity
!@
p17Body groundYe s
Diagnostic Procedure 1
SYMPTOM: Blower motor does not rotate at all. (Fan switch
ªAUTOº, ª1º, ª2º, ª3º, ª4º)
lPerform PRELIMINARY CHECK 2 before referring to the
following flow chart.
CHECK POWER SUPPLY FOR
BLOWER MOTOR.
Disconnect blower motor harness con-
nector.
Do approx.12 voltsexist between
blower motor harness terminal No.
p1
and body ground?
OK
ENG
Check 15A fuses (No.
,at fuse block.
(Refer to ªPOWER SUP-
PLY ROUTINGº in EL
section and Wiring Dia-
gram.)
Check circuit continuity between
blower motor harness terminal No.
p2
and body ground.
OK
ENG
Reconnect blower motor
harness connector.
CHECK BLOWER MOTOR.
NG
Replace blower motor.
CHECK BLOWER MOTOR CIRCUIT
BETWEEN BLOWER MOTOR AND
RESISTOR.
Do approx.12 voltsexist between
resistor harness terminal No.
p5and
body ground?
OK
ENG
Disconnect blower motor
and resistor harness
connectors.
Note
Check circuit continuity
between blower motor
harness terminal No.
p2and resistor harness
terminal No.
p5.
pA
(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
YHA240 Auto amp. connector
KHA118
Blower motor
connector
KHA119
Blower motor
connector
Continuity should exist.
KHA120
Resistor connec-
tor
YHA244
Blower motor
connectorResistor
connector
H
H
H
H
H
H
TROUBLE DIAGNOSESAUTO
Main Power Supply and Ground Circuit
Check (Cont'd)
HA-52
Page 1902 of 2267
pA
CHECK RESISTOR AFTER DISCON-
NECTING IT.
OK
ENG
Replace resistor.
CHECK FAN SWITCH. (Refer to Elec-
trical Components Inspection.) (HA-78)
OK
ENG
Replace A/C control
panel.
Note
Check circuit continuity between fan
switch harness terminal No.
p2,
p8,p14,p20and body ground.
Check body ground circuit for A/C
control panel. (Refer to Main Power
Supply and Ground Circuit Check,
HA-51).
OK
Replace blower motor.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
NHA447
A/C Control
panel connectorH
H
H
H
TROUBLE DIAGNOSESAUTO
Diagnostic Procedure 1 (Cont'd)
HA-53
Page 1903 of 2267

Diagnostic Procedure 2: Models with relay
type 1
SYMPTOM: Blower motor does not rotate at all when the fan
speed is in AUTO. (It operates in 1, 2, 3, or
4-speed only.)
CHECK POWER SUPPLY FOR A/C
(LO) RELAY.
Disconnect LO relay harness connec-
tor.
Do approx.12 voltsexist between
AUTO relay harness terminal No.
p1
and body ground?
OK
ENG
Check 10A fuse (No.26)
at fuse block.
(Refer to ªPOWER SUP-
PLY ROUTINGº in EL sec-
tion and Wiring Diagram.)
Check circuit continuity between LO
relay harness terminal No.
p2and
body ground.
OK
ENG
CHECK FAN SWITCH
(Refer to Electrical Com-
ponents Inspection.)
(HA-78)
OK NG
Replace
A/C con-
trol panel.
Note
Check circuit continuity
between LO relay har-
ness terminal No.
p2
and A/C control panel
harness terminal No.
p33.
Note
CHECK POWER SUPPLY FOR LO
RELAY.
Do approx.12 voltsexist between LO
relay harness terminal No.
p3and
body ground?
OK
ENG
Check circuit continuity
between resistor harness
terminal No.
p8and LO
relay harness terminal
No.
p3.
pA
(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
YHA245
LO relay
connector
YHA246
LO relay
connector
YHA247
LO relay
connector
YHA248
LO relay
connectorResistor
connector
NHA448
A/C control panel
connectorLO relay
connector
Continuity should exist when test leads
are connected as shown; itshould not
exist when test leads are reversed.
H
H
H
H
H
TROUBLE DIAGNOSESAUTO
HA-54
Page 1904 of 2267
pA
Note
Check circuit continuity between LO relay
harness terminal No.
p5and body
ground.
OK
CHECK LO RELAY AFTER DISCON-
NECTING IT.
ENG
Replace LO relay.YHA250
LO relay
connector
H
H
TROUBLE DIAGNOSESAUTO
Diagnostic Procedure 2: Models with relay
type 1 (Cont'd)
HA-55