Nissan Sentra. Instruction — part 556
HAC-72
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR (DRIVER SIDE)
B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR (DRIVER SIDE)
DTC Logic
INFOID:0000000009757666
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 air mix door motors DTC (B27A2 – B27A5) are detected, there is probably a disconnected connector or an
open circuit in air mix 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:0000000009757667
Regarding Wiring Diagram information, refer to
1.
CHECK AIR MIX DOOR MOTOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect air mix door motor connector.
3. Turn ignition switch ON.
4. Check voltage between air mix door motor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair harness or connector between air mix door motor and fuse.
2.
CHECK AIR MIX DOOR MOTOR LH DRIVE SIGNAL CIRCUIT FOR OPEN
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible cause
B27A2
DR AIR MIX DOOR MOT
Short or open circuit of air mix door motor drive
signal terminal 1.
• Air mix door motor
• A/C auto amp.
• Harness or connectors
(The motor circuit is open or short-
ed.)
B27A3
Short or open circuit of air mix door motor drive
signal terminal 2.
B27A4
Short or open circuit of air mix door motor drive
signal terminal 3.
B27A5
Short or open circuit of air mix door motor drive
signal terminal 4.
+
−
Voltage
Air mix door motor
Connector
Terminal
M128
5
Ground
Battery voltage
B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR (DRIVER SIDE)
HAC-73
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between air mix door motor LH harness connector and A/C auto amp. harness connec-
tor.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK AIR MIX DOOR MOTOR LH DRIVE SIGNAL CIRCUIT FOR SHORT
Check continuity between air mix door motor LH 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 AIR MIX DOOR MOTOR LH
Check air mix door motor LH. Refer to
HAC-75, "Component Inspection"
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-105, "Removal and Installation"
.
NO
>> Replace air mix door motor LH. Refer to
HAC-112, "AIR MIX DOOR MOTOR : Removal and
Installation - Air Mix Door Motor LH"
Component Inspection
INFOID:0000000009757668
1.
CHECK AIR MIX DOOR MOTOR LH
1. Remove air mix door motor LH. Refer to
HAC-112, "AIR MIX DOOR MOTOR : Removal and Installation -
2. Check resistance between air mix door motor LH terminals. Refer to applicable table for the normal value.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace air mix door motor LH. Refer to
HAC-112, "AIR MIX DOOR MOTOR : Removal and
Installation - Air Mix Door Motor LH"
Air mix door motor LH
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M128
1
M34
34
Yes
2
33
3
32
4
31
Air mix door motor LH
—
Continuity
Connector
Terminal
M128
1
Ground
No
2
3
4
Terminal
Resistance (
Ω)
(Approx.)
5
1
90
2
3
4
HAC-74
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
B27AA, B27AB, B27AC, B27AD AIR MIX DOOR MOTOR (PASSENGER SIDE)
B27AA, B27AB, B27AC, B27AD AIR MIX DOOR MOTOR (PASSENGER
SIDE)
DTC Logic
INFOID:0000000009757669
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 air mix door motors DTC (B27A2 – B27A5) are detected, there is probably a disconnected connector or an
open circuit in air mix 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:0000000009757670
Regarding Wiring Diagram information, refer to
1.
CHECK AIR MIX DOOR MOTOR RH POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect air mix door motor RH connector.
3. Turn ignition switch ON.
4. Check voltage between air mix door motor RH harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair harness or connector.
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible cause
B27AA
AS AIR MIX DOOR MOT
Short or open circuit of air mix door motor drive
signal terminal 1.
• Air mix door motor
• A/C auto amp.
• Harness or connectors
(The motor circuit is open or short-
ed.)
B27AB
Short or open circuit of air mix door motor drive
signal terminal 2.
B27AC
Short or open circuit of air mix door motor drive
signal terminal 3.
B27AD
Short or open circuit of air mix door motor drive
signal terminal 4.
+
−
Voltage
Air mix door motor RH
Connector
Terminal
M127
5
Ground
Battery voltage
B27AA, B27AB, B27AC, B27AD AIR MIX DOOR MOTOR (PASSENGER SIDE)
HAC-75
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
2.
CHECK AIR MIX DOOR MOTOR DRIVE SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between air mix door motor RH harness connector and A/C auto amp. harness connec-
tor.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK AIR MIX DOOR MOTOR RH DRIVE SIGNAL CIRCUIT FOR SHORT
Check continuity between air mix door motor RH 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 AIR MIX DOOR MOTOR RH
Check air mix door motor RH. Refer to
HAC-75, "Component Inspection"
.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-105, "Removal and Installation"
.
NO
>> Replace air mix door motor RH. Refer to
HAC-112, "AIR MIX DOOR MOTOR : Removal and
Installation - Air Mix Door Motor RH"
.
Component Inspection
INFOID:0000000009757671
1.
CHECK AIR MIX DOOR MOTOR RH
1. Remove air mix door motor RH. Refer to
HAC-112, "AIR MIX DOOR MOTOR : Removal and Installation -
.
2. Check resistance between air mix door motor RH terminals. Refer to applicable table for the normal value.
Is the inspection result normal?
YES
>> Inspection End.
Air mix door motor RH
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M127
1
M34
20
Yes
2
19
3
18
4
17
Air mix door motor RH
—
Continuity
Connector
Terminal
M127
1
Ground
No
2
3
4
Terminal
Resistance (
Ω)
(Approx.)
5
1
90
2
3
4
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