2012 Renault Scala Service and Repair Manual
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HAC-1
VENTILATION, HEATER & AIR CONDITIONER
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SECTION HAC
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CONTENTS
HEATER & AIR CONDITIONING CONTROL SYSTEM
MANUAL AIR CONDITIONING
PRECAUTION .............................................. 3
PRECAUTIONS .................................................. 3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .................................................................. 3
Precaution for Work ................................................. 3
Working with HFC-134a (R-134a) ............................ 3
Service Equipment ................................................... 4
PREPARATION ........................................... 7
PREPARATION .................................................. 7
Special Service Tool ................................................ 7
Commercial Service Tool ......................................... 7
SYSTEM DESCRIPTION ............................. 8
COMPONENT PARTS ....................................... 8
Component Parts Location ....................................... 8
Component Description ............................................ 9
SYSTEM ............................................................10
MANUAL AIR CONDITIONING SYSTEM ................ 10
MANUAL AIR CONDITIONING SYSTEM : Sys-
tem Diagram ........................................................... 10
MANUAL AIR CONDITIONING SYSTEM : Sys-
tem Description ...................................................... 10
MANUAL AIR CONDITIONING SYSTEM : Com-
pressor Control ....................................................... 10
MANUAL AIR CONDITIONING SYSTEM : Door
Control .................................................................... 11
OPERATION ......................................................14
Switch Name and Function .................................... 14
DIAGNOSIS SYSTEM (BCM) ...........................15
COMMON ITEM ........................................................ 15
COMMON ITEM : CONSULT Function (BCM -
COMMON ITEM) ....................................................15
AIR CONDITIONER ..................................................16
AIR CONDITIONER : CONSULT Function (BCM -
AIR CONDITIONER) ..............................................16
ECU DIAGNOSIS INFORMATION ............. 17
BCM, ECM, IPDM E/R ....................................... 17
List of ECU Reference ............................................17
WIRING DIAGRAM ..................................... 18
MANUAL AIR CONDITIONING SYSTEM ......... 18
Wiring Diagram .......................................................18
MANUAL HEATER SYSTEM ............................ 23
Wiring Diagram .......................................................23
BASIC INSPECTION .................................. 25
DIAGNOSIS AND REPAIR WORKFLOW ........ 25
Workflow .................................................................25
OPERATION INSPECTION .............................. 27
Work Procedure ......................................................27
DTC/CIRCUIT DIAGNOSIS ........................ 29
A/C ON SIGNAL ................................................ 29
Component Function Check ...................................29
Diagnosis Procedure ..............................................29
Component Inspection ............................................30
BLOWER FAN ON SIGNAL ............................. 32
Component Function Check ...................................32
Diagnosis Procedure ..............................................32
A/C INDICATOR ................................................ 34
Diagnosis Procedure ..............................................34
FRONT BLOWER MOTOR ............................... 35
Description ..............................................................35
Revision: July 2011 2012 Versa Sedan
HAC-2
Diagnosis Procedure ............................................. 35
Component Inspection (Front Blower Motor) ......... 37
Component Inspection (Blower Relay) .................. 37
Component Inspection (Front Blower Motor Re-
sistor) ..................................................................... 37
Component Inspection (Fan Switch) ..................... 37
MAGNET CLUTCH ........................................... 39
Description ............................................................. 39
Component Function Check .................................. 39
Diagnosis Procedure ............................................. 39
SYMPTOM DIAGNOSIS ............................ 41
MANUAL AIR CONDITIONING SYSTEM ........ 41
Symptom Table ..................................................... 41
INSUFFICIENT COOLING ................................ 42
Description ............................................................. 42
Diagnosis Procedure ............................................. 42
INSUFFICIENT HEATING ................................ 43
Description ............................................................. 43
Diagnosis Procedure ............................................. 43
COMPRESSOR DOES NOT OPERATE .......... 44
Description ............................................................. 44
Diagnosis Procedure ............................................. 44
UNIT REMOVAL AND INSTALLATION .... 45
CONTROL PANEL ........................................... 45
Exploded View ....................................................... 45
Removal and Installation ........................................ 45
THERMO CONTROL AMPLIFIER ................... 46
Exploded View ....................................................... 46
Removal and Installation ........................................ 46
REFRIGERANT PRESSURE SENSOR ........... 47
Removal and Installation for Refrigerant Pressure
Sensor .................................................................... 47
BLOWER FAN RESISTOR .............................. 48
Exploded View ....................................................... 48
Removal and Installation ........................................ 48
DOOR CABLE .................................................. 49
Exploded View ....................................................... 49
INTAKE DOOR CABLE ........................................... 49
INTAKE DOOR CABLE : Removal and Installation
... 49
INTAKE DOOR CABLE : Adjustment .................... 49
MODE DOOR CABLE .............................................. 50
MODE DOOR CABLE : Removal and Installation ... 50
MODE DOOR CABLE : Adjustment ....................... 50
AIR MIX DOOR CABLE ........................................... 50
AIR MIX DOOR CABLE : Removal and Installation
... 50
AIR MIX DOOR CABLE : Adjustment .................... 51
Revision: July 2011 2012 Versa Sedan
PRECAUTIONS
HAC-3
< PRECAUTION >
[MANUAL AIR CONDITIONING]
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER" INFOID:0000000007732969
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the
battery, and wait at least 3 minutes before performing any service.
Precaution for Work INFOID:0000000007733812
• When removing or disassembling each component, be careful not to damage or deform it. If a component
may be subject to interference, be sure to protect it with a shop cloth.
• When removing (disengaging) components with a screwdriver or similar tool, be sure to wrap the component
with a shop cloth or vinyl tape to protect it.
• Protect the removed parts with a shop cloth and prevent them from being dropped.
• Replace a deformed or damaged clip.
• If a part is specified as a non-reusable part, always replace it with new one.
• Be sure to tighten bolts and nuts securely to the specified torque.
• After installation is complete, be sure to check that each part works properly.
• Follow the steps below to clean components.
- Water soluble dirt: Dip a soft cloth into lukewarm water, and wring the water out of the cloth to wipe the dirty
area.
Then rub with a soft and dry cloth.
- Oily dirt: Dip a soft cloth into lukewarm water with mild detergent (concentration: within 2 to 3%), and wipe
the dirty area.
Then dip a cloth into fresh water, and wring the water out of the cloth to wipe the detergent off. Then rub with
a soft and dry cloth.
• Do not use organic solvent such as thinner, benzene, alcohol, or gasoline.
• For genuine leather seats, use a genuine leather seat cleaner.
Working with HFC-134a (R-134a) INFOID:0000000007732972
WARNING:
• CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants
are mixed compressor failure is likely to occur. Refer to HA-5, " Precautions For Refrigerant System
Revision: July 2011 2012 Versa Sedan
HAC-4
< PRECAUTION >
[MANUAL AIR CONDITIONING]
PRECAUTIONS
Service " . To determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refrig-
erant Recovery/Recycling Recharging equipment and Refrigerant Identifier.
• Use only specified oil for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components. If
oil other than that specified is used, compressor failure is likely to occur.
• The specified HFC-134a (R-134a) oil rapidly absorbs moisture from the atmosphere. The following
handling precautions must be observed:
- When removing refrigerant components from a vehicle, immediately cap (seal) the component to
minimize the entry of moisture from the atmosphere.
- When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just
before connecting the components. Connect all refrigerant loop components as quickly as possible
to minimize the entry of moisture into system.
- Only use the specified oil from a sealed container. Immediately reseal containers of oil. Without
proper sealing, oil will become moisture saturated and should not be used.
- Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.
Remove HFC-134a (R-134a) from the A/C system using certified service equipment meeting require-
ments of SAE J2210 [HFC-134a (R-134a) recycling equipment], or J2209 [HFC-134a (R-134a) recy-
cling equipment]. If accidental system discharge occurs, ventilate work area before resuming
service. Additional health and safety information may be obtained from refrigerant and oil manufac-
turers.
- Do not allow A/C oil to come in contact with styrofoam parts. Damage may result.
CONTAMINATED REFRIGERANT
If a refrigerant other than pure HFC-134a (R-134a) is identified in a vehicle, your options are:
• Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant into
the atmosphere.
• Explain that recovery of the contaminated refrigerant could damage your service equipment and refrigerant
supply.
• Suggest the customer return the vehicle to the location of previous service where the contamination may
have occurred.
• If you choose to perform the repair, recover the refrigerant using only dedicated equipment and contain-
ers. Do not recover contaminated refrigerant into your existing service equipment. If your facility does
not have dedicated recovery equipment, you may contact a local refrigerant product retailer for available ser-
vice. This refrigerant must be disposed of in accordance with all federal and local regulations. In addition,
replacement of all refrigerant system components on the vehicle is recommended.
• If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact NISSAN Cus-
tomer Affairs for further assistance.
Service Equipment INFOID:0000000007732973
RECOVERY/RECYCLING EQUIPMENT
Follow the manufacturer's instructions for machine operation and machine maintenance. Never introduce any
refrigerant other than that specified into the machine.
ELECTRONIC LEAK DETECTOR
Follow the manufacturer's instructions for tester operation and tester maintenance.
VACUUM PUMP
Revision: July 2011 2012 Versa Sedan
PRECAUTIONS
HAC-5
< PRECAUTION >
[MANUAL AIR CONDITIONING]
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The oil contained inside the vacuum pump is not compatible with the
specified oil for HFC-134a (R-134a) A/C systems. The vent side of
the vacuum pump is exposed to atmospheric pressure so the vac-
uum pump oil may migrate out of the pump into the service hose.
This is possible when the pump is switched off after evacuation (vac-
uuming) and hose is connected to it.
To prevent this migration, use a manual valve situated near the
hose-to-pump connection, as follows.
• Usually vacuum pumps have a manual isolator valve as part of the
pump. Close this valve to isolate the service hose from the pump.
• For pumps without an isolator, use a hose equipped with a manual
shut-off valve near the pump end. Close the valve to isolate the
hose from the pump.
• If the hose has an automatic shut off valve, disconnect the hose
from the pump: as long as the hose is connected, the valve is open
and lubricating oil may migrate.
Some one-way valves open when vacuum is applied and close
under a no vacuum condition. Such valves may restrict the pump's
ability to pull a deep vacuum and are not recommended.
MANIFOLD GAUGE SET
Be certain that the gauge face indicates R-134a or 134a. Make sure
the gauge set has 1/2″-16 ACME threaded connections for service
hoses. Confirm the set has been used only with refrigerant HFC-
134a (R-134a) along with specified oil.
SERVICE HOSES
Be certain that the service hoses display the markings described
(colored hose with black stripe). All hoses must include positive shut-
off devices (either manual or automatic) near the end of the hoses
opposite the manifold gauge.
SERVICE COUPLERS
RHA270D
SHA533D
RHA272D
Revision: July 2011 2012 Versa Sedan
HAC-6
< PRECAUTION >
[MANUAL AIR CONDITIONING]
PRECAUTIONS
Never attempt to connect HFC-134a (R-134a) service couplers to a
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly connect to the CFC-12 (R-12) system. However, if an
improper connection is attempted, discharging and contamination
may occur.
WEIGHT SCALE
Verify that no refrigerant other than HFC-134a (R-134a) and speci-
fied oils have been used with the weight scale. If the weight scale
controls refrigerant flow electronically, the hose fitting must be 1/2”-
16 ACME.
CHARGING CYLINDER
Using a charging cylinder is not recommended. Refrigerant may be vented into air from cylinder's top valve
when filling the cylinder with refrigerant. Also, the accuracy of the cylinder is generally less than that of an
electronic scale or of quality recycle/recharge equipment.
Shut-off valve rotation A/C service valve
Clockwise Open
Counterclockwise Close
RHA273D
RHA274D
Revision: July 2011 2012 Versa Sedan
PREPARATION
HAC-7
< PREPARATION >
[MANUAL AIR CONDITIONING]
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PREPARATION
Special Service Tool INFOID:0000000007732970
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Commercial Service Tool INFOID:0000000007732971
Tool number
(Kent-Moore No.)
Tool name
Description
—
(J-46534)
Trim Tool Set
Removing trim components
AWJIA0483ZZ
Tool name Description
Power tool Loosening bolts, screws and nuts
PIIB1407E
Revision: July 2011 2012 Versa Sedan
HAC-8
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location INFOID:0000000007207651
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
Revision: July 2011 2012 Versa Sedan
COMPONENT PARTS
HAC-9
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
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Component Description INFOID:0000000007630818
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.
Revision: July 2011 2012 Versa Sedan
HAC-10
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
SYSTEM
SYSTEM
MANUAL AIR CONDITIONING SYSTEM
MANUAL AIR CONDITIONING SYSTEM : System Diagram INFOID:0000000007630810
MANUAL AIR CONDITIONING SYSTEM : System Description INFOID:0000000007630811
• 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 INFOID:0000000007207662
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-37, " 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-5, " RELAY CONTROL SYSTEM : System Description "
CONTROL BY THERMO CONTROL AMP.
ALIIA0477GB
Module/Function Door control A/C request signal Compressor control Cooling fan control
Front air control HAC-11 HAC-10
BCM BCS-6
ECM HAC-10 EC-37
IPDM E/R HAC-10 EC-37
Revision: July 2011 2012 Versa Sedan
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