2009 RENAULT SCENIC engine

62B - 7
CLIMATE CONTROL
Fault finding – System operation62B
V3 MR-372-J84-62B000$020.mif
Vdiag No.: 44
CLIMATE CONTROL
Fault finding – System operation
GENERAL INFORMATION:
The climate control system fitted on the SCENIC is controlled by four computers. This system is called a
DISTRIBUTED FUNCTION. Fault finding on the climate control is performed in two different ways using the
diagnostic tool. The first method consists of performing fault finding on each computer which allows
communications to be established with just one computer (select the climate control computer). The second
procedure consists of performing fault finding on each function which allows communications to be established
with all four computers of the AIR CONDITIONING function. These two fault finding methods are described in the
introduction of this repair manual.
DESCRIPTION OF THE OPERA
TION OF THE CLIMATE CONTROL COMPUTER:
The climate control computer controls the passenger compartment ventilation, the distribution motor, the mixing
motor and the recirculation motor.
The climate control computer also controls two sensors, these being the interior temperature sensor and the solar
radiation sensor.
The two sensors and the three motors are connected to the climate control computer by wire connections. The
climate control computer controls the passenger compartment ventilation using a modulated control signal (square
signal) sent to a power module (wire connection).
All other signals used by the climate control computer or transmitted by this computer to other computers are sent on
the multiplex network.
Cold air production (cold loop) and warm air production (heating) are controlled by the other three computers
involved in the Air conditioning function (UCH, protection and switching unit and injection computer).
The main signals used by the climate control computer are:
–+ 12 V sidelights,
–0 V rheostat controlled,
–exterior temperature,
–engine coolant temperature,
–engine operating status,
–engine speed,
–electrical power consumed,
–request to set the blown air temperature.
OPERA
TING NOTES:
–When the engine is switched off, the passenger compartment blower unit operates approximately 30% slower than
the requested speed (control panel setting).
–If any of the actuators are faulty, the air conditioning can no longer control them, but the setting requests are still
displayed on the control panel: warning lights light up, display of symbols on the control panel (distribution motor
position, passenger compartment blower speed, AC symbol, etc.).
–If the exterior temperature sensor is faulty, the climate control computer is switched on 5 seconds after the
ignition is switched on (this allows a fault to be identified as fault finding cannot be performed on the exterior
temperature sensor by the UCH).
ACREG X84 1.1
Edition 2
MR-372-J84-62B000$020.mif

62B - 10
CLIMATE CONTROL
Fault finding – Configurations and programming62B
V3 MR-372-J84-62B000$040.mif
Vdiag No.: 44
CLIMATE CONTROL
Fault finding – Configurations and programming
CLIMATE CONTROL COMPUTER CONFIGURATION:
The climate control computer has 2 configuration functions. These configurations need to be set after the computer
has been replaced.
These two configurations are important as they ensure air conditioning is optimised within the vehicle (better control
of automatic climate control). If they are not correctly entered, cold air and warm air production will be severely
affected (e.g. heating resistors will not be switched on to heat the passenger compartment air).
These configurations can be accessed in repair mode by the diagnostic tool and can only be entered using
the fault finding by computer menu as opposed to the fault finding by function menu.
These configurations can be read, also using the diagnostic tool in repair mode to ensure they have been correctly
set. Configurations can be read in both fault finding by computer mode and fault finding by function mode.
–The first configuration is CF044 Vehicle type; this configuration allows you to enter the body type to which the
climate control computer is fitted (J84/R84 for 4 wheel drive Mégane Scénic and Scénic, and OTHER X84 for all
other Méganes). The configuration reading is called: LC013 Vehicle type.
–The second configuration is CF117 Type of heating resistors; this configuration is used to enter the type of
passenger compartment air heating resistors fitted in the vehicle. There are three options: WITHOUT for vehicles
without 1000 W and 1800 W resistors.
Heating resistors are mainly fitted on vehicles with Diesel engines.
They are located in the ventilation - air distribution unit (left-hand side), next to the heater matrix. The label affixed
to the resistor unit (with the part number) specifies whether the resistors are 1000 or 1800 W (Note: 1800 W
resistors are mainly fitted to Mégane Scénics). This configuration reading is called: LC043 Heating resistor.
Note:
In fault finding by function mode, the diagnostic tool can also display the configuration readings of the other computers
involved in the air conditioning function. All configurations of the air conditioning function (injection computer, UCH
and Protection and Switching Unit) are listed in Section 62A Air conditioning.
MIXING
AND DISTRIBUTION MOTOR PROGRAMMING PROCEDURE (self-setting):
There is no specific programming operation for the mixing motor and the distribution motor.
However, the minimum and maximum limits of these motors have to be programmed. This operation is automatic and
is performed in the following cases:
–after replacing the mixing or distribution motor,
–after disconnecting the battery or after disconnecting the climate control computer supply fuse,
–if a fault, declared as present when the ignition was switched off, disappears the next time the ignition is switched
on.
IMPORTANT
To ensure this programming operation is performed correctly, the passenger compartment blower must be

switched off (speed set to 0).
ACREG X84 1.1
Edition 2
MR-372-J84-62B000$040.mif

List of monitored parts: Computer
FAULT FINDING LOG
System: Air conditioningPage 1/2
●Administrative identification
Date 2 0
Log completed by
VIN
Engine
Diagnostic tool CLIP
Update version
●Customer complaint
1127 No warm air 1129 Faulty air distribution 1130 Incorrect temperature setting
1128 No cold air 1125 Heating/air conditioning:
ventilation1182 Heating/air conditioning:
demisting
OtherYour comments:
●
Conditions under which the customer complaint occurs
011 When the ignition is
switched on005 While driving 004 Intermittently
010 Gradual
deterioration012 When the air conditioning is
switched on009 Sudden fault
OtherYour comments:
●
Documentation used in fault finding
Fault finding procedure used
Type of diagnostic manual:
Workshop Repair Manual Technical Note Assisted fault finding
Fault finding manual no.:
Wiring diagram used
Wiring Diagram Technical Note No.:
Other documentation
Title and/or part number:
FD 04
Fault finding log
page to print or photocopy - page to print or photocopy - page to print or photocopy

62B-14
CLIMATE CONTROL
Fault finding – Interpretation of faults62B
V3 MR-372-J84-62B000$060.mif
Vdiag No.: 44
CLIMATE CONTROL
Fault finding – Interpretation of faults
DF001
PRESENT
OR
STOREDCOMPUTER
1.DEF : Internal electronic fault
NOTESConditions for applying the fault finding procedure to stored faults:
Apply this fault finding procedure if the fault appears as present or stored again after:
–clearing the fault and switching the ignition off then back on.
If the fault is stored: clear the fault, switch off the ignition and disconnect the climate control computer supply
fuse.
–Refit the fuse and switch the ignition back on.
–Start the engine and switch on the air conditioning.
If the fault reappears as stored: contact your Techline.
If the fault does not reappear: leave the air conditioning switched on and select various ventilation and air
distribution settings to check that the system is working correctly.
If the fault is present: contact your Techline.
AFTER REPAIRIf the computer has been replaced (at the request of the Techline): reconfigure the
computer (see section Configurations and Programming).
Deal with any other faults.
ACREG X84 1.1
Edition 2
MR-372-J84-62B000$060.mif

62B - 28
CLIMATE CONTROL
Fault finding – Interpretation of parameters62B
V3 MR-372-J84-62B000$080.mif
Vdiag No.: 44
CLIMATE CONTROL
Fault finding – Interpretation of parameters
PR001
INTERIOR TEMPERATURE
NOTESNone.
The climate control computer receives the interior temperature signal through a wire connection.
To ensure this parameter is correct (without using a thermometer), simply read the temperature information
when the vehicle is cold (in the morning). The interior temperature, the exterior temperature and the engine
coolant temperature should be practically the same.
Another way of checking whether this sensor is correct is to check the resistance value of the sensor according
to temperature: refer to the electrical specifications of the sensor in the Help section.
If the temperature displayed by this parameter seems to be incorrect, apply the fault finding procedure for fault:
DF007 Interior temperature sensor circuit.
AFTER REPAIRRepeat the conformity check from the start.
ACREG X84 1.1
Edition 2
MR-372-J84-62B000$080.mif

62B - 30
CLIMATE CONTROL
Fault finding – Interpretation of parameters62B
V3 MR-372-J84-62B000$080.mif
Vdiag No.: 44
The following table gives the percentages by which the air distribution motor is controlled as well as the opening
status of the lower flaps (footwell flap and under seat duct flap). To view the lower flaps, remove the right-hand and
left-hand lower air ducts.
Values should be checked with the engine switched off and the air conditioning in manual mode (tolerance ± 5%).PR011
DISTRIBUTION FLAP POSITION
NOTESThe values listed below are only given as a guide (they depend on which way the flap
is being moved).
Air distribution
requestPR011
Distribution
flap positionAir flow distribution information
Lower flap
opening status Demisting
flowVent flow Footwell flow
Demisting
100%
High Low NoneCompletely
CLOSED
Demisting + Footwells
60%
High Low HighCompletely
OPEN
Air vents
0%
Low High NoneCompletely
CLOSED
Vents + Footwells
15%
Low High HighApproximately 20%
OPEN
Footwell Ventilation
50%
Average Average HighCompletely
OPEN
AFTER REPAIRRepeat the conformity check from the start.
ACREG X84 1.1
Edition 2

62B - 32
CLIMATE CONTROL
Fault finding – Interpretation of parameters62B
V3 MR-372-J84-62B000$080.mif
Vdiag No.: 44
Controlled values for engine switched off and engine running with air conditioning in manual mode (tolerance ± 5%).
If the values given above are correct but the passenger compartment blower does not work, refer to fault finding
chart ALP 5 No passenger compartment ventilation. PR019
PASSENGER COMPARTMENT BLOWER PWM SETTING
NOTESThe values listed below are only given as a guide.
Passenger compartment
blower speed setting.SPD 0 SPD 1 SPD 2 SPD 3 SPD 4 SPD 5 SPD 6 SPD 7 SPD 8
PR019 passenger
compartment blower
PWM setting.0% 18% 23% 30% 39% 51% 66% 82% 100%
AFTER REPAIRRepeat the conformity check from the start.
ACREG X84 1.1
Edition 2

62B - 34
CLIMATE CONTROL
Fault finding – Interpretation of parameters62B
V3 MR-372-J84-62B000$080.mif
Vdiag No.: 44
PR121
BLOWN AIR TEMPERATURE SETTING
NOTESNone.
This parameter is used to control the temperature inside the passenger compartment. This setting is calculated
by the climate control computer according to interior temperature, exterior temperature and coolant
temperature.
This setting is used to control the mixing motor and the request to operate the passenger compartment air
heating resistors (to reach the temperature requested by the user as quickly as possible in order to optimise
passenger compartment comfort quickly).
The following conditions must be satisfied to allow the UCH to control the passenger compartment air heating
resistors:
–Engine running,
–Passenger compartment blower running (minimum speed 1),
–User temperature setting above 20 ˚C (or automatic mode requested),
–Blown air temperature setting above 65 ˚C,
–Interior temperature below 10 ˚C,
–Exterior temperature below 5 ˚C,
–Engine coolant temperature below 65 ˚C,
–Injection authorisation (ET019 Number of RCHs authorised by injection system < at 1),
–Alternator authorisation (ET018 Number of RCHs authorised by alternator < at 1).
Note:
–Statuses ET017, ET018 and ET019 are indicated by the UCH (see conformity check of air conditioning
function: Section 62A).
–The values given below are average values. The UCH calculates the number of passenger compartment
heating resistors to trigger (ET017 number of RCH required).
AFTER REPAIRRepeat the conformity check from the start.
ACREG X84 1.1
Edition 2