1998 NISSAN PATROL Heather And Air Conditioner Workshop Manual

3. Check recirculation
a. Press recirculation switch.
Recirculation indicator should light.
b. Listen for intake door position change (you should hear blower
sound change slightly).
4. Check temperature decrease
a. Turn temperature control knob to full cold.
b. Check for cold air at discharge air outlets.
5. Check temperature increase
a. Turn temperature control knob to full hot.
b. Check for hot air at discharge air outlets.
6. Check air conditioner switch
Turn fan control knob to the desired (1 to 4-speed) position and
push the air conditioner switch to turn ON the air conditioner.
The indicator light should come on when air conditioner is ON.
RHA585G
RHA586G
RHA587G
RHA588G
TROUBLE DIAGNOSESMANUAL
Operational Check (Cont'd)
HA-23

Intake Door Motor
TROUBLE DIAGNOSIS PROCEDURE FOR INTAKE DOOR
SYMPTOM:
+Intake door does not change.
Inspection ¯ow
*1: HA-26 *2: HA-22 *3: HA-21
RHA592G
TROUBLE DIAGNOSESMANUAL
HA-24

SYSTEM DESCRIPTION
Intake door motor
The intake door motor is installed on the intake unit. Using a link it
opens and closes the intake door.
When RECIRCULATION switch is at REC, the ground line of the
motor is switched from terminalj
14toj13. This starts the motor
because the position switch contacts built into it make current flow.
When RECIRCULATION switch is at FRE, the ground line is
switched from terminalj
13toj14. The contacts turn along with the
motor. When they reach the non-current ¯ow position, the motor will
stop. The motor always turns in the same direction.
RHA589G
TROUBLE DIAGNOSESMANUAL
Intake Door Motor (Cont'd)
HA-25

DIAGNOSTIC PROCEDURE
SYMPTOM: Intake door does not change.
CHECK POWER SUPPLY FOR INTAKE
DOOR MOTOR.
Disconnect intake door motor harness con-
nector.
Do approx. 12 volts exist between intake
door motor harness terminal No.j
1and
body ground?
Ye s
cNo
Check 10A (No.) fuse
at fuse block.
(Refer to ``POWER SUP-
PLY ROUTING'' in EL sec-
tion and Wiring Diagram.)
CHECK GROUND CIRCUIT FOR INTAKE
DOOR MOTOR.
Check continuity between intake door
motor harness terminal and body ground.
Continuity should exist.
OK
cNG
Disconnect recirculation
switch harness connector.
Note
Check continuity between
recirculation switch harness
terminal No.j
1(j2) and
intake door motor harness
terminal No.j
13(j14).
Continuity should exist.
If OK, check harness for
short.
OK
CHECK INTAKE DOOR LINKAGE.
Refer to Control Linkage Adjustment. (HA-
27)
OK
Replace intake door motor.
jA
TerminalRecirculation
switch condition
Body groundj
14FRE
j
13REC
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
RHA350FB
RHA590G
RHA591G
.
.
.
..
TROUBLE DIAGNOSESMANUAL
Intake Door Motor (Cont'd)
HA-26

jA
Note
CHECK GROUND CIRCUIT FOR RECIR-
CULATION SWITCH.
Check circuit continuity between recircula-
tion switch harness terminal No.j
4and
body ground.
Continuity should exist.
If OK, check harness for short.
OK
CHECK RECIRCULATION SWITCH.
(Refer to Electrical Components Inspec-
tion.) (HA-27)
cNG
Replace recirculation
switch.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
ELECTRICAL COMPONENTS INSPECTION
Recirculation switch
Check continuity between terminals at each switch position.
Terminal No.
Recirculation
switch conditionContinuity
(+) (þ)
j
1j4REC Yes
FRE No
j
2j4REC No
FRE Yes
CONTROL LINKAGE ADJUSTMENT
Intake door motor
1. Install intake door motor on intake unit.
Ensure that the intake door motor lever is ®tted into the slit
portion of intake door link.
2. Connect the intake door motor harness connector.
3. Turn ignition switch to ON.
4. Check that intake door operates properly when RECIRCULA-
TION switch is turned ON and OFF.
RHA582FB
RHA768F
RHA593F
.
.
TROUBLE DIAGNOSESMANUAL
Intake Door Motor (Cont'd)
HA-27

Blower Motor
TROUBLE DIAGNOSIS PROCEDURE FOR BLOWER MOTOR
SYMPTOM:
+Blower motor does not rotate at all.
Inspection ¯ow
*1: HA-31 *2: HA-22 *3: HA-21
RHA593G
TROUBLE DIAGNOSESMANUAL
HA-28

INCIDENTFlow chart
No.
1 Fan fails to rotate.
2 Fan does not rotate at 1-speed.
3 Fan does not rotate at 2-speed.
4 Fan does not rotate at 3-speed.
5 Fan does not rotate at 4-speed.
DIAGNOSTIC PROCEDURE
SYMPTOM: Blower motor does not rotate.
+Perform PRELIMINARY CHECK 1 before referring to the
following ¯ow chart.
Check if blower motor rotates properly
at each fan speed.
Conduct checks as per ¯ow chart at
left.
cjE
cjD
cjC
cjB
(Go to next page.)
CHECK POWER SUPPLY FOR BLOWER
MOTOR.
Disconnect blower motor harness connec-
tor.
Do approx. 12 volts exist between blower
motor harness terminal No.j
2and body
ground?
Ye s
cNo
Check 15A (No.and
No.) fuses at fuse
block.
(Refer to ``POWER SUP-
PLY ROUTING'' in EL sec-
tion and Wiring Diagram.)
1. Turn fan control knob to any position
except OFF.
2. Check circuit continuity between blower
motor harness terminal No.j
1and body
ground.
Continuity should exist.
OK
cNG
Reconnect blower motor
harness connector.
CHECK BLOWER MOTOR.
(Refer to Electrical Components Inspec-
tion.) (HA-31)
NG
Replace blower motor.
.
CHECK BLOWER MOTOR CIRCUIT
BETWEEN BLOWER MOTOR AND
RESISTOR.
Do approx. 12 volts exist between resistor
harness terminal No.j
4and body ground?
Ye s
cNo
Disconnect blower motor
and resistor harness con-
nectors.
Disconnect fan switch harness connector.Note
Check circuit continuity
between blower motor har-
ness terminal No.j
1and
resistor harness terminal
No.j
4.
Continuity should exist.
If OK, check harness for
short.
jA(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
RHA596G
RHA597G
RHA598G
RHA599G
.
.
.
.
..
.
TROUBLE DIAGNOSESMANUAL
Blower Motor (Cont'd)
HA-29

jA
Note
CHECK GROUND CIRCUIT FOR FAN
SWITCH.
Check circuit continuity between fan switch
harness terminal No.j
5and body ground.
OK
CHECK RESISTOR AFTER DISCONNECT-
ING IT.
(Refer to Electrical Components Inspection.)
(HA-31)
OK NG
bjB
bjC
bjD
Replace resistor.jE
Reconnect resistor harness connector.
...
CHECK FAN SWITCH CIRCUIT.
Do approx. 12 volts exist between each fan switch har-
ness terminal and body ground?
Ye s N o
.
Note
Check circuit continuity
between fan switch harness
terminal and resistor har-
ness terminal.
If OK, check harness for
short.
CHECK FAN SWITCH AFTER DIS-
CONNECTING IT.
(Refer to Electrical Components
Inspection.) (HA-31)cNG
Replace fan switch.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
Flow chart
No.Terminal No.
Voltage
Å@
j1
Body ground Approx. 12Vj2
j3
j4
Terminal No.
Conti-
nuity Fan
switchResistor
j
4j4
Ye s j3j3
j2j2
j1j1
RHA600G
RHA601G
RHA602G
.
.
.
.
.
.
.
TROUBLE DIAGNOSESMANUAL
Blower Motor (Cont'd)
HA-30