2011 INFINITI QX56 Factory Service Manual

Page 3177 of 5598

INFINITI QX56 2011  Factory Service Manual 
SYSTEM SETTINGHAC-71
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONING]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
Movement Change FunctionINFOID:0000000006275902
DESCRIPTION
Condition for interlocking movemen

Page 3178 of 5598

INFINITI QX56 2011  Factory Service Manual 
HAC-72
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
U1000 CAN COMM CIRCUIT
DTC/CIRCUIT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000006275903
CAN (Controller Area Network) is a

Page 3179 of 5598

INFINITI QX56 2011  Factory Service Manual 
U1010 CONTROL UNIT (CAN)HAC-73
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
U1010 CONTROL UNIT (CAN)
DescriptionINFOID:0000000006275906
Initial diagnosis o

Page 3180 of 5598

INFINITI QX56 2011  Factory Service Manual 
HAC-74
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
B2578, B2579 FRONT IN-VEHICLE SENSOR
B2578, B2579 FRONT IN-VEHICLE SENSOR
DTC LogicINFOID:0000000006275909
DTC DETECTION LOGIC 
NOTE:
 If

Page 3181 of 5598

INFINITI QX56 2011  Factory Service Manual 
B2578, B2579 FRONT IN-VEHICLE SENSORHAC-75
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK FRONT IN

Page 3182 of 5598

INFINITI QX56 2011  Factory Service Manual 
HAC-76
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
B2578, B2579 FRONT IN-VEHICLE SENSOR
Is the inspection result normal?
YES >> INSPECTION END 
NO >> Replace front in-vehicle sensor. Refer

Page 3183 of 5598

INFINITI QX56 2011  Factory Service Manual 
B257B, B257C AMBIENT SENSORHAC-77
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
B257B, B257C AMBIENT SENSOR
DTC LogicINFOID:0000000006275912
DTC DETECTION L

Page 3184 of 5598

INFINITI QX56 2011  Factory Service Manual 
HAC-78
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
B257B, B257C AMBIENT SENSOR
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK AMBIENT SENSOR 
Check ambient sensor. Refer to  HAC