Nissan Maxima. Manual — part 720
HAC-56
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
BLOWER MOTOR
1. Turn ignition switch OFF.
2. Disconnect blower motor harness connector.
3. Check continuity between blower motor harness connector M31
terminal 4 and ground.
Is the inspection result normal?
YES
>> Replace blower motor. Refer to
MOTOR : Removal and Installation"
NO
>> Repair harness or connector.
10.
CHECK POWER SUPPLY OF THE FRONT BLOWER MOTOR RELAY
1. Turn the ignition switch OFF.
2. Remove the front blower motor relay.
3. Turn the ignition switch ON.
4. Check the voltage between front blower motor relay harness connector J-4 terminals 2, 3 and ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Repair harness or connector.
11.
CHECK FRONT BLOWER MOTOR RELAY GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between front blower motor relay harness connector J-4 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> Repair harness or connector.
12.
CHECK BLOWER MOTOR SUPPLY CIRCUIT FOR OPEN
Check continuity between blower motor harness connector M31 terminal 4 and front blower motor relay har-
ness connector J-4 terminal 5.
Is the inspection result normal?
YES
>> Replace front blower motor relay.
NO
>> Repair harness or connector.
4 - Ground
: Continuity should not exist.
AWIIA1158ZZ
2, 3 - Ground
: Battery voltage
1 - Ground
: Continuity should exist.
5 - 4
: Continuity should exist.
MAGNET CLUTCH
HAC-57
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
C
D
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A
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HAC
N
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MAGNET CLUTCH
Description
INFOID:0000000010051001
SYSTEM DESCRIPTION
A/C auto amp. controls A/C compressor operation by ambient temperature and signal from ECM.
Low Temperature Protection Control
A/C auto amp. will turn the A/C compressor ON or OFF as deter-
mined by a signal detected by ambient sensor.
When ambient temperature is greater than 4
°C (39°F), the A/C com-
pressor turns ON. The A/C compressor turns OFF when ambient
temperature is less than 2.5
°C (37°F).
Component Function Check
INFOID:0000000010051002
1.
FUNCTION INSPECTIONS
1. Press AUTO switch. AUTO is indicated on the display.
2. Press the A/C switch.
3. Check that the indicator of the A/C switch turns on. Check visually and by sound that the compressor is
operating. (The discharge air temperature or fan speed varies depending on the ambient temperature, in-
vehicle temperature, and temperature setting.)
4. Press the A/C switch again.
5. Check that the indicator of the A/C switch turns OFF. Check visually and by sound that the compressor
stops.
Does it operate normally?
YES
>> Inspection End.
NO
>> Perform trouble diagnosis for the compressor. Refer to
Diagnosis Procedure
INFOID:0000000010051003
Regarding Wiring Diagram information, refer to
HAC-67, "Wiring Diagram - With Color Display"
AWIIA1185GB
HAC-58
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
1.
INSPECTION IN AUTO ACTIVE TEST MODE
Perform “AUTO ACTIVE TEST”. Refer to
PCS-11, "Diagnosis Description"
.
Does it operate normally?
YES
>> GO TO 6.
NO
>> GO TO 2.
2.
CHECK POWER SUPPLY FOR A/C COMPRESSOR
1. Turn ignition switch OFF.
2. Disconnect A/C compressor connector.
3. Start engine and press A/C switch.
4. Check voltage between A/C compressor harness connector F3 terminal 1 and ground.
Is the inspection result normal?
YES
>>
Check magnet clutch coil.
1. If NG, replace magnet clutch. Refer to
HA-37, "Removal and Installation for Compressor"
2. If OK, check A/C compressor mounting points for looseness or corrosion and repair as neces-
sary.
NO
>> GO TO 3
3.
CHECK FUSE
Check 10A fuse (No. 41).
NOTE:
PG-64, "Fuse, Connector and Terminal Arrangement"
for fuse location.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 5.
4.
CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY IN IPDM E/R AND A/C COMPRESSOR
1. Turn ignition switch OFF.
AWIIA1095GB
Terminal
Voltage (V)
(Approx.)
(+)
(-)
Connector - Terminal
Body ground
12V
F3-1
MAGNET CLUTCH
HAC-59
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
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A
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HAC
N
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2. Disconnect IPDM E/R connector F10 and A/C compressor con-
nector F3.
3. Check continuity between A/C compressor harness connector
F3 (A) terminal 1 and IPDM E/R harness connector F10 (B) ter-
minal 48.
Is the inspection result normal?
YES
>> Replace A/C Relay.
NO
>> Repair harness or connector.
5.
CHECK A/C COMPRESSOR CIRCUIT FOR SHORT
Check continuity between A/C compressor harness connector F3
terminal 1 and ground.
Is the inspection result normal?
YES
>> Replace IPDM E/R. Refer to
NO
>> Repair harness or connector.
6.
CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT
1. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
2. Check if any DTC No. is displayed in the self-diagnosis results.
NOTE:
If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to
.
Is any DTC No. displayed?
YES
>> Perform diagnosis for the applicable DTC. Refer to
NO
>> GO TO 7.
7.
CHECK A/C AUTO AMP. INPUT SIGNAL
Using CONSULT, check “On/Off” of “COMP REQ SIG” and “FAN REQ SIG” in “DATA MONITOR” of HVAC.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace A/C auto amp. Refer to
HAC-100, "Removal and Installation"
.
8.
CHECK REFRIGERANT PRESSURE SENSOR
Check refrigerant pressure sensor. Refer to
EC-515, "Component Function Check"
.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Repair or replace malfunctioning parts.
1 - 48
: Continuity should exist.
AWIIA0622ZZ
1 - Ground
: Continuity should not exist.
AWIIA1168ZZ
A/C SWITCH ON
: COMP REQ SIG On
A/C SWITCH OFF
: COMP REQ SIG Off
FAN CONTROL DIAL ON
: FAN REQ SIG On
FAN CONTROL DIAL OFF
: FAN REQ SIG Off
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