Nissan Maxima. Manual — part 719
HAC-52
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
B263D, B263E, B263F INTAKE DOOR MOTOR
Diagnosis Procedure
INFOID:0000000010050997
Regarding Wiring Diagram information, refer to
HAC-67, "Wiring Diagram - With Color Display"
.
1.
CHECK INTAKE DOOR MOTOR POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between intake door motor harness connector
M126 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair harness or connector.
2.
CHECK SIGNAL FOR INTAKE DOOR MOTOR
Confirm A/C LAN signal between intake door motor harness connec-
tor M126 terminal 3 and ground using an oscilloscope.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK INTAKE DOOR MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect intake door motor connector.
3. Check continuity between intake door motor harness connector
M126 terminal 2 and ground.
Is the inspection result normal?
YES
>> Replace intake door motor. Refer to
DOOR MOTOR : Removal and Installation"
.
NO
>> Repair harness or connector.
1 - Ground
: Battery Voltage
AWIIA1151ZZ
(+)
(
−)
Voltage
Intake door motor
—
Connector
Terminal
M126
3
Ground
AWIIA1152ZZ
SJIA1453J
2 - Ground
: Continuity should exist.
AWIIA1153ZZ
BLOWER MOTOR
HAC-53
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
BLOWER MOTOR
Description
INFOID:0000000010050998
COMPONENT DESCRIPTION
Brush-less Motor
The blower motor utilizes a brush-less motor with a rotating magnet.
Quietness is improved over previous motors where the brush was
the point of contact and the coil rotated.
Blower Motor Circuit
Component Function Check
INFOID:0000000010050999
1.
CHECK OPERATION
1. Warm up the engine.
2. Operate the fan control dial. Check that the fan speed and indicator are switched for all fan speeds.
Does it operate normally?
YES
>> Inspection End.
NO
>> Perform trouble diagnosis for the blower motor. Refer to
Diagnosis Procedure
INFOID:0000000010051000
Regarding Wiring Diagram information, refer to
HAC-67, "Wiring Diagram - With Color Display"
1.
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 2.
2.
CHECK WITH ACTIVE TEST OF CONSULT
ZHA152H
AWIIA1094GB
HAC-54
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
BLOWER MOTOR
1. Using CONSULT, perform “HVAC TEST”“ACTIVE TEST” of HVAC to check each output device. Refer to
.
NOTE:
Perform the ACTIVE TEST after starting the engine because the compressor is operating.
2. Check that the blower motor control signal changes according to each indicator signal.
NOTE:
Perform the inspection of each output device after starting the engine because the compressor is operating.
Does it operate normally?
YES
>> Inspection End.
NO
>> GO TO 3.
3.
CHECK FUSE
Check 15A fuses (Nos. 21 and 22).
NOTE:
for fuse location.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 8.
4.
CHECK POWER SUPPLY FOR BLOWER MOTOR
1. Turn ignition switch OFF.
2. Disconnect blower motor connector.
3. Turn ignition switch ON.
4. Check voltage between blower motor harness connector M31
terminal 4 and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 10.
5.
CHECK BLOWER MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between blower motor harness connector M31
terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK BLOWER MOTOR CIRCUIT CONTINUITY
Test item
MODE 1
MODE 2
MODE 3
MODE 4
MODE 5
MODE 6
Mode door position
VENT1
B/L1
B/L2
FOOT
D/F
DEF
Intake door position
REC
REC
20% FRE
FRE
FRE
FRE
Air mix door position
(driver & passenger
side)
FULL COLD
FULL COLD
FULL HOT
FULL HOT
FULL HOT
FULL HOT
Blower motor duty ratio
37%
91%
65%
65%
65%
91%
Compressor (Magnet
clutch)
ON
ON
OFF
OFF
ON
ON
4 - Ground
: Battery voltage
AWIIA1154ZZ
1 - Ground
: Continuity should exist.
AWIIA1155ZZ
BLOWER MOTOR
HAC-55
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Disconnect A/C auto amp. connector.
2. Check continuity between blower motor harness connector M31
(A) terminal 3 and A/C auto amp. harness connector M37 (B)
terminal 32.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK A/C AUTO AMP. OUTPUT SIGNAL
1. Reconnect blower motor connector and A/C auto amp. connec-
tor.
2. Turn ignition switch ON.
3. Set MODE switch to the VENT position.
4. Check the output waveform between blower motor harness con-
nector M31 terminal 3 and ground using an oscilloscope, while
varying the fan speed from 1 to 7.
Is the inspection result normal?
YES
>> Replace the blower motor. Refer to
VTL-16, "BLOWER MOTOR : Removal and Installation"
NO
>> Replace the A/C auto amp. Refer to
HAC-100, "Removal and Installation"
.
8.
REPLACE FUSES
1. Replace fuses.
2. Activate the blower motor.
Does the fuse blow?
YES
>> GO TO 9.
NO
>> Inspection End.
9.
CHECK BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
3 - 32
: Continuity should exist.
AWIIA1156ZZ
AWIIA1157ZZ
AWIIA1098GB
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