Nissan Xterra. Manual — part 458
HAC-30
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
BLOWER MOTOR
1. Turn ignition switch ON.
2. Check voltage between front blower motor relay harness con-
nector E54 terminal 1 and ground.
Is the inspection result normal?
YES
>> Intermittent incident. Refer to
.
NO
>> Repair harness or connector.
9.
REPLACE FUSES
Replace fuses.
Does the fuse blow?
YES
>> • If fuse blows without activating the front blower motor, repair short between fuse and front
blower motor relay.
• If fuse blows activating the front blower motor, GO TO 10.
NO
>> Inspection End.
10.
CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector and variable blower
control connector.
3. Check continuity between variable blower control harness con-
nector M121 terminal 4 and ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Repair harness or connector.
11.
CHECK FRONT BLOWER MOTOR
Check front blower motor. Refer to
HAC-31, "Front Blower Motor Component Inspection"
.
Is the inspection result normal?
YES
>> Replace variable blower control. Refer to
VTL-10, "Removal and Installation"
.
NO
>> Replace front blower motor. Refer to
VTL-9, "Removal and Installation"
.
12.
CHECK FRONT BLOWER MOTOR
Check front blower motor. Refer to
HAC-31, "Front Blower Motor Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Replace front blower motor. Refer to
VTL-9, "Removal and Installation"
.
13.
CHECK BLOWER MOTOR GROUND CIRCUIT
1. Disconnect variable blower control harness connector.
2. Check continuity between front blower motor harness connector
M62 (B) terminal 1 and variable blower control harness connec-
tor M121 (A) terminal 2.
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> Repair harness or connector.
14.
CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN
1 - Ground
: Battery voltage
WJIA1991E
4 - Ground
: Continuity should not exist.
AWIIA0177ZZ
1 - 2
: Continuity should exist.
AWIIA0179ZZ
BLOWER MOTOR
HAC-31
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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HAC
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Check continuity between front blower motor relay harness connec-
tor E54 (A) terminals 3, 6 and variable blower control harness con-
nector M121 (B) terminal 4.
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Repair harness or connector.
15.
CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT
Check continuity between variable blower control harness connector
M121 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> Repair harness or connector.
16.
CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT
1. Reconnect all disconnected component connectors.
2. Turn ignition switch ON.
3. While turning blower control dial from minimum to maximum speed, check voltage between variable
blower control connector M121 terminal 3 and ground.
Is the inspection result normal?
YES
>> Replace variable blower control. Refer to
VTL-10, "Removal and Installation"
.
NO
>> GO TO 17.
17.
CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect variable blower control.
3. Check continuity between front air control harness connector M50 terminal 13 and variable blower control
harness connector M121 terminal 3.
Is the inspection result normal?
YES
>> Replace front air control. Refer to
VTL-7, "Removal and Installation"
.
NO
>> Repair harness or connector.
Front Blower Motor Component Inspection
INFOID:0000000009482480
COMPONENT INSPECTION
Front Blower Motor Relay
3, 6 - 4
: Continuity should exist.
AWIIA1212ZZ
1 - Ground
: Continuity should exist.
AWIIA0180ZZ
3 - Ground
Varying between approx.: 0 to 4.5V
13 - 3
: Continuity should exist.
HAC-32
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
BLOWER MOTOR
Check continuity between terminals 3 and 5 and terminals 7 and 6
by supplying 12 volts and ground to coil side terminals 1 and 2 of the
relay.
Front Blower Motor
Confirm smooth rotation of the blower motor.
• Ensure that there are no foreign particles inside the blower unit.
• Apply 12 volts to terminal 2 and ground to terminal 1 and verify that
the motor operates freely and quietly.
LJIA0068E
WJIA1508E
MAGNET CLUTCH
HAC-33
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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MAGNET CLUTCH
System Description
INFOID:0000000009482481
SYSTEM DESCRIPTION
When the blower speed dial is in one of the fan speed positions, the front air control outputs a fan ON signal to
the BCM. When the A/C switch is pressed, the A/C switch LED illuminates and the front air control outputs a
compressor ON signal to the BCM. Any mode control button can be selected. The front air control also moni-
tors the intake sensor for low temperature. As long as the BCM receives a compressor ON signal and a fan
ON signal from the front air control, the conditions required for the BCM to transmit a compressor ON request
to the ECM have been met.
The BCM sends a compressor ON signal to ECM, via CAN communication line.
The ECM judges whether the compressor can be turned ON, based on each sensor status (refrigerant pres-
sure sensor signal, throttle angle sensor, etc.). If it judges the compressor can be turned ON, it sends a com-
pressor ON signal to IPDM E/R, via CAN communication line.
Upon receipt of a compressor ON signal from ECM, IPDM E/R turns the A/C relay ON to operate the compres-
sor.
Low Temperature Protection Control
The IPDM E/R will turn the compressor ON or OFF as determined by a signal detected from the intake sensor.
The front air control monitors the intake sensor, and based on the threshold temperatures will stop sending the
compressor ON signal to the BCM.
When intake air temperature is higher than 3.5
°C (38.3°F), the compressor turns ON. When the intake air tem-
perature is lower than 2.5
°C (36.5°F) the compressor turns OFF.
Magnet Clutch Component Function Check
INFOID:0000000009482482
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH
1. Rotate blower control dial clockwise.
2. Press the vent (
) mode switch.
3. Press A/C switch. Confirm that the compressor clutch engages (sound or visual inspection).
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-33, "Magnet Clutch Diagnosis Procedure"
.
Magnet Clutch Diagnosis Procedure
INFOID:0000000009482483
Regarding Wiring Diagram information, refer to
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
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