Nissan Altima L32. Instruction — part 838
HAC-126
< COMPONENT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
BLOWER MOTOR
BLOWER MOTOR
Description
INFOID:0000000004498275
SYSTEM DESCRIPTION
Component Parts
Fan speed control system components are:
• Front air control
• A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)
System Operation
Component Function Check
INFOID:0000000004498276
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATION 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.
Can a symptom be duplicated?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to
Is the inspection result normal?
YES
>> Refer to
HAC-155, "Symptom Matrix Chart"
.
NO
>> System OK.
3.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.
CHECK BLOWER MOTOR OPERATION
Check and verify blower motor operates in all speeds.
Does blower motor operate in all speeds?
AWIIA0044GB
BLOWER MOTOR
HAC-127
< COMPONENT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
YES
>> GO TO 5.
NO
>> Refer to
HAC-127, "Diagnosis Procedure"
5.
RECHECK FOR SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to
.
Does another symptom exist?
YES
>> Repair as necessary.
NO
>> Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
Diagnosis Procedure
INFOID:0000000004498277
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.
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
AWIIA0045GB
Terminal
Voltage (V)
(Approx.)
(+)
(-)
Connector - Terminal
E6 - 6P
Body ground
12V
AWIIA0614ZZ
HAC-128
< COMPONENT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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, 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
M37-40
AWIIA0635ZZ
BLOWER MOTOR
HAC-129
< COMPONENT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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. 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. Press ignition switch ON.
2. Disconnect BCM harness connector M18.
3. Check voltage between BCM harness connector M18 terminal
55 and ground.
Is the inspection result normal?
YES
>> Replace BCM. Refer to
BCS-96, "Removal and Installation"
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.
Is the inspection result normal?
YES
>> Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
6P - Ground
: Battery Voltage
AWIIA0615ZZ
Terminal
Continuity
(+)
(-)
Connector - Terminal
Connector - Terminal
Yes
M19-90
E6 - 6P
AWIIA0636ZZ
Terminal
Voltage (V)
(Approx.)
Continuity
(+)
(-)
Connector - Terminal
Connector - Terminal
12V
M18-55
Ground
AWIIA0617ZZ
Terminal
Continuity
(+)
(-)
Connector - Terminal
Connector - Terminal
Yes
M18 - 55
M37 - 24
AWIIA0618ZZ
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