Nissan Xterra. Instruction — part 457
HAC-26
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
INTAKE DOOR MOTOR
2. Press vent mode (
) switch.
3. Press REC (
) switch.
4. Press REC (
) switch again.
5. Listen for intake door position change (you should hear blower sound change slightly).
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-26, "Intake Door Motor Diagnosis Procedure"
Intake Door Motor Diagnosis Procedure
INFOID:0000000009482476
Regarding Wiring Diagram information, refer to
SYMPTOM:
• Intake door does not change.
• Intake door motor does not operate normally.
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
1.
CHECK INTAKE DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M50 and the intake door motor harness connector
M58.
3. Check continuity between front air control harness connector M50 terminals 21, 22 and the intake door
motor harness connector M58 terminals 1, 6.
4. Check continuity between front air control harness connector
M50 terminals 21, 22 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace harness as necessary.
2.
CHECK FRONT AIR CONTROL FOR INTAKE DOOR MOTOR POWER AND GROUND
1. Reconnect front air control harness connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M50
terminal 21 and terminal 22 while placing the HVAC system into
self-diagnostic mode.
Is the inspection result normal?
YES
>> Inspect intake door for binding or mechanical failure. If intake door moves freely, replace the
intake door motor. Refer to
VTL-18, "Removal and Installation"
.
NO
>> Replace front air control. Refer to
VTL-7, "Removal and Installation"
.
Connector
Terminal
Connector
Terminal
Continuity
M50
21
M58
6
Yes
22
1
Connector
Terminal
—
Continuity
M50
21
Ground
No
22
AWIIA0398ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M50
22
21
Self-diagnostic mode (opening)
Battery voltage
21
22
Self-diagnostic mode (closing)
Battery voltage
AWIIA0399ZZ
BLOWER MOTOR
HAC-27
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
BLOWER MOTOR
System Description
INFOID:0000000009482477
Component Parts
Blower speed control system components are:
• Front air control
• Variable blower control
• Front blower motor
• Front blower motor relay
System Operation
COMPONENT DESCRIPTION
Variable Blower Control
The variable blower control (1) is located on the heater and cooling
unit assembly. The variable blower control receives a gate voltage
from the front air control to steplessly maintain the blower motor volt-
age in the 0 to 5 volt range (approx.)
⇒: front
Front Blower Motor Component Function Check
INFOID:0000000009482478
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER
1. Rotate the blower control dial clockwise. Blower should operate.
2. Rotate the blower control dial clockwise, and continue checking blower speed until all speeds are
checked.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-28, "Front Blower Motor Diagnosis Procedure"
AWIIA1209ZZ
AWIIA1225ZZ
HAC-28
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
BLOWER MOTOR
Front Blower Motor Diagnosis Procedure
INFOID:0000000009482479
Regarding Wiring Diagram information, refer to
SYMPTOM: Blower motor operation is malfunctioning.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
1.
CHECK FUSES
Check 15A fuses [No. 24 and 27 (Located in the fuse and fusible link box)]. For fuse layout refer to
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 9.
2.
CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector.
3. Turn ignition switch ON.
4. Rotate blower control dial to maximum speed.
5. Press the A/C switch.
6. Check voltage between front blower motor harness connector
M62 terminal 2 and ground.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 3.
3.
CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT
AWIIA1784GB
Fuses are good.
2 - Ground
: Battery voltage
WJIA1331E
BLOWER MOTOR
HAC-29
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Turn ignition switch OFF.
2. Disconnect front blower motor relay.
3. Check voltage between front blower motor relay harness con-
nector E54 terminals 5,7 and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK FRONT BLOWER MOTOR RELAY
Turn ignition switch OFF.
Check front blower motor relay. Refer to
HAC-31, "Front Blower Motor Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace front blower motor relay.
5.
CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) CIRCUIT FOR OPEN
Check continuity between front blower motor relay harness connec-
tor E54 terminals 3, 6 and front blower motor harness connector
M62 terminal 2.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN
1. Disconnect variable blower control harness connector.
2. Check continuity between front blower motor relay harness con-
nector E54 (A) terminals 3, 6 and variable blower control har-
ness connector M121 (B) terminal 4.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT
Check continuity between front blower motor relay harness connec-
tor E54 terminal 2 and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair harness or connector.
8.
CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY
5, 7 - Ground
: Battery voltage
WJIA1634E
3, 6 - 2
: Continuity should exist.
WJIA1333E
3, 6 - 4
: Continuity should exist.
AWIIA1212ZZ
2 - Ground
: Continuity should exist
AWIIA1227ZZ
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