Nissan Sentra. Manual — part 557
HAC-76
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
B27AA, B27AB, B27AC, B27AD AIR MIX DOOR MOTOR (PASSENGER SIDE)
NO
>> Replace air mix door motor RH. Refer to
HAC-112, "AIR MIX DOOR MOTOR : Removal and
B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR
HAC-77
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR
DTC Logic
INFOID:0000000009757672
DTC DETECTION LOGIC
NOTE:
• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
.
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
.
• If mode door motors DTC (B27A6 – B27A9) are detected, there is probably a disconnected connector or an
open circuit in mode door motor drive power supply harness.
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.
3. Check DTC.
Is DTC detected?
YES
>> Refer to
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000009757673
Regarding Wiring Diagram information, refer to
1.
CHECK MODE DOOR MOTOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect mode door motor connector.
3. Turn ignition switch ON.
4. Check voltage between mode door motor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair harness or connector between mode door motor and fuse.
2.
CHECK MODE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible cause
B27A6
MODE DOOR MOTOR
Short or open circuit of mode door motor drive
signal terminal 1.
• Mode door motor
• A/C auto amp.
• Harness or connectors
(The motor circuit is open or short-
ed.)
B27A7
Short or open circuit of mode door motor drive
signal terminal 2.
B27A8
Short or open circuit of mode door motor drive
signal terminal 3.
B27A9
Short or open circuit of mode door motor drive
signal terminal 4.
+
−
Voltage
Mode door motor
Connector
Terminal
M126
5
Ground
Battery voltage
HAC-78
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between mode door motor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK MODE DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR SHORT
Check continuity between mode door motor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK MODE DOOR MOTOR
Check mode door motor. Refer to
HAC-78, "Component Inspection"
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-105, "Removal and Installation"
.
NO
>> Replace mode door motor. Refer to
HAC-112, "MODE DOOR MOTOR : Removal and Installa-
.
Component Inspection
INFOID:0000000009757674
1.
CHECK MODE DOOR MOTOR
1. Remove mode door motor. Refer to
HAC-112, "MODE DOOR MOTOR : Removal and Installation"
2. Check resistance between mode door motor terminals. Refer to applicable table for the normal value.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace mode door motor. Refer to
HAC-112, "MODE DOOR MOTOR : Removal and Installa-
.
Mode door motor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M126
4
M34
37
Yes
3
38
2
39
1
40
Mode door motor
—
Continuity
Connector
Terminal
M126
4
Ground
No
3
2
1
Terminal
Resistance (
Ω)
(Approx.)
5
1
90
2
3
4
B27A0, B27A1 INTAKE DOOR MOTOR
HAC-79
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
B27A0, B27A1 INTAKE DOOR MOTOR
DTC Logic
INFOID:0000000009757675
DTC DETECTION LOGIC
NOTE:
• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
.
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
.
*: A/C auto amp. operates intake door motor according to target value of PBR opening angle at 40% when per-
forming self-diagnosis.
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Start engine.
2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.
3. Check DTC.
Is DTC detected?
YES
>> Refer to
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000009757676
Regarding Wiring Diagram information, refer to
1.
CHECK INTAKE DOOR MOTOR OPERATION
1. Turn ignition switch ON.
2. Operate intake switch and check by operation sound that intake door motor operates.
Does the intake door motor operate?
YES
>> GO TO 2.
NO
>> GO TO 8.
2.
CHECK INTAKE DOOR MOTOR PBR POWER SUPPLY
1. Disconnect intake door motor connector.
2. Turn ignition switch ON.
3. Check voltage between intake door motor harness connector and ground.
Is the inspection result normal?
DTC
Items
(CONSULT screen terms)
DTC detection condition
*
Possible cause
B27A0
INTAKE DOOR MOTOR
PBR opening angle of intake door motor is 50%
or more. (PBR feedback signal voltage of intake
door motor is 2.5 V or more)
• Intake door motor
• Intake door motor system installa-
tion condition
• A/C auto amp.
• Harness or connectors
(The motor circuit is open or short-
ed.)
B27A1
PBR opening angle of intake door motor is 30%
or less. (PBR feedback signal voltage of intake
door motor is 1.5 V or less)
+
−
Voltage
(Approx.)
Intake door motor
Connector
Terminal
M58
1
Ground
5 V
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