Nissan Sentra. Manual - 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