Nissan Versa Sedan. Manual - part 488

PREPARATION

HAC-7

< PREPARATION >

[MANUAL AIR CONDITIONING]

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PREPARATION

PREPARATION

Special Service Tool

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The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Commercial Service Tool

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Tool number
(Kent-Moore No.)
Tool name

Description

—

(J-46534)
Trim Tool Set

Removing trim components

AWJIA0483ZZ

Tool name

Description

Power tool

Loosening nuts, screws and bolts

PIIB1407E

HAC-8

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

COMPONENT PARTS

SYSTEM DESCRIPTION

COMPONENT PARTS

Component Parts Location

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1.

IPDM E/R

2.

ECM

3.

BCM (view with instrument panel re-
moved)

4.

Front air control

5.

A/C compressor

6.

Front blower motor (view with A/C 
unit assembly removed)

7.

Front blower motor resistor (view 
with A/C unit assembly removed)

8.

Thermo control amp. (view with A/C 
unit assembly removed)

9.

Refrigerant pressure sensor

10. Fuse block (J/B)

11. Blower relay

ALIIA0470ZZ

COMPONENT PARTS

HAC-9

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

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Component Description

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Component

Description

A/C compressor

Vaporized refrigerant is drawn into the A/C compressor from the evaporator, where it is compressed 
to a high pressure, high temperature vapor. The hot, compressed vapor is then discharged to the con-
denser.

BCM

The BCM receives the fan ON and A/C ON signals from the front air control and sends a compressor 
ON request to the ECM. 

ECM

The ECM sends a compressor ON request to the IPDM E/R based on the status of engine operation 
and load as well as refrigerant pressure information. If all the conditions are met for A/C operation, 
the ECM transmits the compressor ON request to the IPDM E/R.

Fuse Block (J/B)

Located in the passenger compartment, behind the left lower IP, the Fuse Block (J/B) contains the 
front blower motor relay and several fuses required for the air conditioner control system.

Front air control

The front air control controls the operation of the A/C and heating system.

Front blower motor

The front blower motor varies the speed at which the air flows through the ventilation system. 

Front blower motor relay

The front blower motor relay controls the flow of current to fuse 20, 21 and 22 in the Fuse Block (J/
B). The relay is connected directly to ground, and is energized when the ignition switch is in the ON 
or START position.

Front blower motor resistor

Ground for the blower is supplied through blower resistor and the blower speed switch. As the switch 
is moved from position 1 through 5, more current is allowed to flow through the motor, for a higher 
speed. This is because less resistors are in the path as the switch is moved to a higher position. When 
the switch is on the highest position, all resistors are bypassed. 

IPDM E/R

A/C relay is integrated in IPDM E/R. IPDM E/R operates A/C relay when receiving A/C compressor 
request signal from ECM via CAN communication line.

Refrigerant pressure sensor

Refer to 

EC-26, "Refrigerant Pressure Sensor"

.

Thermo control amp.

Thermo control amp. is composed of thermistor and amplifier. When the A/C switch signal is received 
from the front air control, the thermo control amp. transmits the A/C ON signal to the BCM according 
to evaporator fin temperature. When the thermistor detecting temperature of the air that passes 
through evaporator is extremely low, the thermo control amp. sends the A/C OFF signal to BCM, and 
stops the compressor.

HAC-10

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

SYSTEM

SYSTEM

MANUAL AIR CONDITIONING SYSTEM
MANUAL AIR CONDITIONING SYSTEM : System Diagram

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MANUAL AIR CONDITIONING SYSTEM : System Description

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• The manual air conditioning system is controlled by a sequence of functions from the front air control, BCM,

ECM, and IPDM E/R.

• The fan speed of the front blower motor is changed by the combination of the fan control dial (fan switch)

operation and blower resistor control.

MANUAL AIR CONDITIONING SYSTEM : Compressor Control

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DESCRIPTION

• When A/C switch signal is received from front air control, the thermo control amp. transmits A/C ON signal to

the BCM according to evaporator fin temperature.

• When the front blower motor is operated, the front air control transmits blower fan ON signal to the BCM.

• BCM transmits the A/C ON signal and blower fan ON signal to ECM via CAN communication line. Refer to

EC-39, "CAN COMMUNICATION : System Description"

• ECM judges the conditions of each sensor (Refrigerant pressure sensor signal, accelerator position signal,

etc.), and transmits the A/C compressor request signal to IPDM E/R via CAN communication line.

• By receiving the A/C compressor request signal from ECM, IPDM E/R turns the A/C relay to ON, and acti-

vates the compressor. Refer to 

PCS-7, "RELAY CONTROL SYSTEM : System Description"

 or 

PCS-34,

"RELAY CONTROL SYSTEM : System Description"

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Module/Function

Door control

A/C request signal

Compressor control

Cooling fan control

Front air control

HAC-11

HAC-10

BCM

BCS-8

  or 

BCS-74

ECM

HAC-10

EC-39

IPDM E/R

HAC-10

EC-39