Nissan X-Trail 32. Instruction — part 1389
SYSTEM
HAC-31
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
JMIIA3618GB
HAC-32
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
SYSTEM
R9M ENGINE MODELS
JMIIA3666GB
SYSTEM
HAC-33
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
AUTOMATIC AIR CONDITIONING SYSTEM : Fail-safe
INFOID:0000000010940905
FAIL-SAFE FUNCTION
If a communication error exists between the A/C auto amp. and A/C control for 30 seconds or longer, air con-
ditioning is controlled under the following conditions: A/C auto amp. is controlled in the setting state before the
communication error occurs for following setting.
• Set temperature
• Air outlet
• Blower fan speed
• Air inlet
• A/C switch
PTC HEATER CONTROL SYSTEM
JMIIA3667GB
HAC-34
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
SYSTEM
PTC HEATER CONTROL SYSTEM : System Description
INFOID:0000000010939710
SYSTEM DIAGRAM
DESCRIPTION
• BCM performs PTC relay ON/OFF control based on engine speed, engine coolant temperature, electrical
power cut freeze signal (permission signal, retention signal, stop signal), blower motor operation state sig-
nal, front window defogger state signal, ambient temperature signal, battery voltage, and electrical load state
(high beam request, low beam request, and others).
• When PTC relay turns ON, power supply is supplied to PTC heater. Heating element is heated and air flow
temperature is increased. Heating is available for a period of time until engine coolant temperature is
increased when engine starts cold in cold climate.
• Idle up request signal is transmitted from BCM to ECM while PTC heater operates. Idle speed is increased,
warming-up is facilitated, and battery electric power is obtained.
• Electric power supplied to PTC heating element is subject to PTC relay control conditions.
NOTE:
PTC heater operation depends on ambient temperature and battery voltage. PTC heater is ON when ambient
temperature is 8
°
C or less. PTC heater is OFF when ambient temperature is 12
°
C (53.6
°
F) or more. PTC
heater is ON when battery voltage is 11.5 V or more. PTC heater is OFF when battery voltage is 11 V or less.
JMIIA3797GB
PTC heater
Operation
PTC relay-1
PTC relay-2
PTC relay-3
Electric power (W)
OFF
OFF
OFF
OFF
OFF
Approx. 0
PTC heater-1
LOW
ON
OFF
OFF
Approx. 333
PTC heater-2
MID
ON
ON
OFF
Approx. 666
PTC heater-3
HI
ON
ON
ON
Approx. 999
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