Nissan Altima L32. Instruction — part 817
HAC-42
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR
NO
>> Repair as necessary.
7.
CHECK IN-VEHICLE SENSOR CIRCUIT
Perform diagnostic procedure for the in-vehicle sensor circuit. Refer to
Is the inspection result normal?
YES
>> GO TO 8
NO
>> Repair as necessary.
8.
CHECK SUNLOAD SENSOR CIRCUIT
Perform diagnostic procedure for the sunload sensor circuit. Refer to
Is the inspection result normal?
YES
>> GO TO 9
NO
>> Repair as necessary.
9.
CHECK INTAKE SENSOR CIRCUIT
Perform diagnostic procedure for the intake sensor circuit. Refer to
.
Is the inspection result normal?
YES
>> GO TO 10
NO
>> Repair as necessary.
10.
RECHECK FOR SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to
HAC-5, "Description and Condi-
.
Does another symptom exist?
YES
>> Repair as necessary.
NO
>> Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
Diagnosis Procedure
INFOID:0000000004498211
SYMPTOM: Blower motor operation is malfunctioning.
DIAGNOSIS PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.
1.
CHECK POWER SUPPLY FOR BLOWER MOTOR
1. Disconnect fuse block (J/B) connector.
2. Press ignition switch ON.
3. Check voltage between fuse block (J/B) harness connector E6
terminal P6 and ground.
Is the inspection result normal?
YES
>> GO TO 2
AWIIA0045GB
Terminal
Voltage (V)
(Approx.)
(+)
(-)
Connector - Terminal
E6 - 6P
Body ground
12V
AWIIA0614ZZ
BLOWER MOTOR
HAC-43
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
NO
>> Check power supply circuit and 15A fuses [Nos. 21 and 22, located in the fuse block (J/B)].
• If OK, check for open circuit in wiring harness.
Repair or replace as necessary.
• If OK, check fuses and check wiring harness for possible open or short circuit.
• If OK, GO TO 5
2.
CHECK BODY GROUND CIRCUIT FOR BLOWER MOTOR
1. Disconnect blower motor connector.
2. Press ignition switch OFF.
3. Check continuity between blower motor harness connector M31
terminal 1 and ground.
Is the inspection result normal?
YES
>> Reconnect blower motor harness connector and GO TO
3
NO
>> Repair harness or connector.
3.
CHECK BLOWER MOTOR CONTROL CIRCUIT BETWEEN BLOWER MOTOR AND FRONT AIR CON-
TROL
1. Disconnect front air control harness connector.
2. Check continuity between blower motor harness connector M31
(A) terminal 3 and front air control harness connector M37 (B)
terminal 1.
Is the inspection result normal?
YES
>> GO TO 4
NO
>> Repair harness or connector.
4.
CHECK POWER SUPPLY FOR FRONT AIR CONTROL
1. Press ignition switch ON.
2. Check voltage between front air control harness connector M37
terminals 39, 19, 40 and ground.
Is the inspection result normal?
YES
>> 1. Replace front air control. Refer to
VTL-8, "Removal and Installation"
2. Confirm that blower motor operation is normal.
NO
>> • Check for open circuit in wiring harness.
Repair or replace as necessary.
• If OK, replace fuse and check wiring harness for short circuit.
Repair or replace an necessary.
5.
CHECK POWER SUPPLY FOR FRONT BLOWER MOTOR RELAY
Terminal
Continuity
Connector - Terminal
Body ground
Yes
M31-1
AWIIA0611ZZ
Terminals
Continuity
Connector - Terminal
Connector - Terminal
Yes
M31-3
M37-1
AWIIA0612ZZ
Terminal
Voltage (V)
(Approx.)
(+)
(-)
Connector - Terminal
Body ground
12V
M37-39
M37-19
M37-40
AWIIA0613ZZ
HAC-44
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR
1. Connect fuse block (J/B) connector.
2. Press ignition switch ON.
3. Turn blower motor control dial to any speed except OFF.
4. Check voltage between fuse block (J/B) E6 terminal 6P and
ground.
Is the inspection result normal?
YES
>> GO TO 9
NO
>> GO TO 6
6.
CHECK POWER SUPPLY FOR FRONT BLOWER MOTOR RELAY FOR AN OPEN
1. Press ignition switch OFF.
2. Disconnect BCM harness connector M19.
3. Disconnect fuse block (J/B) connector.
4. Check continuity between BCM harness connector M19 (A) ter-
minal 90 and fuse block (J/B) harness connector E6 (B) terminal
6P.
Is the inspection result normal?
YES
>> GO TO 7
NO
>> Repair harness or connector.
7.
CHECK BLOWER FAN SWITCH SIGNAL FOR VOLTAGE
1. Disconnect BCM harness connector M18.
2. Press ignition switch ON.
3. Check voltage between BCM harness connector M18 terminal
55 and ground.
Is the inspection result normal?
YES
BCS-96, "Removal and Installa-
.
NO
>> GO TO 8
8.
CHECK BLOWER FAN SWITCH SIGNAL CIRCUIT FOR AN OPEN
1. Press ignition switch OFF.
2. Disconnect front air control harness connector.
3. Check continuity between BCM harness connector M18 (A) ter-
minal 55 and front air control harness connector M37 (B) termi-
nal 24.
6P - Ground
: Battery Voltage
AWIIA0615ZZ
Terminal
Continuity
(+)
(-)
Connector - Terminal
Connector - Terminal
Yes
M19-90
E6 - 6P
AWIIA0616ZZ
Terminal
Voltage (V)
(Approx.)
Continuity
(+)
(-)
Connector - Terminal
Connector - Terminal
M18-55
Ground
12V
AWIIA0617ZZ
Terminal
Continuity
(+)
(-)
Connector - Terminal
Connector - Terminal
Yes
M18 - 55
M37 - 24
AWIIA0618ZZ
BLOWER MOTOR
HAC-45
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Is the inspection result normal?
YES
>> Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
NO
>> Repair harness or connector.
9.
CHECK FRONT BLOWER MOTOR RELAY GROUND
1. Press ignition switch OFF.
2. Disconnect fuse block (J/B) harness connector M5.
3. Check continuity between fuse block (J/B) harness connector
M5 terminal 7M and ground.
Is the inspection result normal?
YES
>> Replace front blower motor relay.
NO
>> Repair harness or connector.
Terminal
Continuity
(+)
(-)
Connector - Terminal
Connector - Terminal
Yes
M5 - 7M
Ground
AWIIA0619ZZ
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