RENAULT SCENIC 2009 J84 / 2.G Air Conditioning Climate Control Workshop Manual

6Air conditioning
V3 MR-372-J84-62B000$TOC.mif
V3
62B
"The repair procedures given by the manufacturer in this document are based on the
technical specifications current when it was prepared.
The procedures may be modified as a result of changes introduced by the
manufacturer in the production of the various component units and accessories from
which his vehicles are constructed."
V3
All rights reserved by Renault s.a.s.
Edition Anglaise
Copying or translating, in part or in full, of this document or use of the service part
reference numbering system is forbidden without the prior written authority of
Renault s.a.s.
© Renault s.a.s. 2009
CLIMATE CONTROL
Vdiag No.: 44
Fault finding – Introduction 62B - 2
Fault finding – System operation 62B - 7
Fault finding – Allocation of computer tracks 62B - 9
Fault finding – Configurations and programming 62B - 10
Fault finding – Summary of faults 62B - 13
Fault finding – Interpretation of faults 62B - 14
Fault finding – Interpretation of statuses 62B - 22
Fault finding – Interpretation of parameters 62B - 28
Fault finding – Conformity check 62B - 35
Fault finding – Customer complaints 62B - 41
Fault finding – Fault Finding Chart 62B - 43
Fault finding – Help 62B - 58

62B - 2
CLIMATE CONTROL
Fault finding – Introduction62B
V3 MR-372-J84-62B000$010.mif
Vdiag No.: 44
162BCLIMATE CONTROL
Fault finding – Introduction
1. SCOPE OF THIS DOCUMENT
This document presents the fault finding procedure applicable to all computers with the following specifications:
2. PREREQUISITES FOR FAULT FINDING
Documentation type:
Fault finding procedures (this manual):
–Assisted fault finding (integrated into the diagnostic tool), Dialogys.
Wiring Diagrams:
–Visu-Schéma (CD-ROM), paper version.
Type of diagnostic tools:
–CLIP
Type of special tooling required:
3. RECAP
Procedure
To run fault finding on the vehicle's computers, switch on the ignition in fault finding mode (forced + after ignition
feed).
Proceed as follows:
–Renault card in the card reader (keyless vehicle scenario 1, standard, not hands-free and scenario 2, top of
the range, hands-free),
–press and hold the Start button (longer than 5 seconds) with start-up conditions not fulfilled,
–then connect the diagnostic tool and perform the required operations.
To cut off + after ignition, proceed as follows:
–disconnect the diagnostic tool,
–press the Start button twice briefly (less than 3 seconds),
–check that the + after ignition feed has been cut off by checking that the computer warning lights on the
instrument panel have gone out. Vehicle: Scénic II
Function concerned: Climate controlComputer name: Careg
Program No.: 0003
Vdiag No.: 44
SPECIAL TOOLING REQUIRED
Multimeter
Elé. 1681 Universal bornier
Note:
The left-hand and right-hand xenon bulb computers are powered when the dipped headlights are lit. Fault finding
procedures can only be carried out on them after the ignition has been switched on in fault finding mode (+ after
ignition imposed) and the dipped headlights are on.
ACREG X84 1.1
Edition 2
MR-372-J84-62B000$010.mif

62B - 3
CLIMATE CONTROL
Fault finding – Introduction62B
V3 MR-372-J84-62B000$010.mif
Vdiag No.: 44
Faults:
Faults are declared as either present or stored (depending on whether they appeared in a certain context and have
disappeared since, or whether they remain present but have not been diagnosed within the current context).
The present or stored status of faults should be taken into consideration when the diagnostic tool is used after the
+ after ignition feed has been supplied (without acting on the system components).
For a present fault, apply the procedure described in the Interpretation of faults section.
For a stored fault, note the faults displayed and apply the instructions in the Notes section.
If the fault is confirmed when the notes are applied, the fault is present. Deal with the fault.
If the fault is not confirmed, check:
–The electrical lines which correspond to the fault,
–The connectors on these lines (corrosion, bent pins, etc.),
–The resistance of the faulty component,
–The condition of the wiring (insulation melted or cut, chafing, etc.).
Conformity check
The aim of the conformity check is to check statuses and parameters that do not produce a fault display on the
diagnostic tool when they are inconsistent. Therefore, this stage is used to:
–carry out fault finding on faults that do not have a fault display, and which may correspond to a customer complaint,
–check that the system is operating correctly and that there is no risk of a fault recurring after repairs.
This section gives the fault finding procedures for statuses and parameters and the conditions for checking them.
If a status is not behaving normally or a parameter is outside the permitted tolerance values, consult the
corresponding fault finding page.
Notes about the conformity check for the air conditioning system
All variables (statuses and parameters) and commands required for the air conditioning function are divided into four
sub-functions:
–the COLD LOOP sub-function, which groups together all the information required for producing cold air,
–the USER SELECTION sub-function, which groups together all the information relating to the user's requests
(buttons pressed, warning lights, etc.),
–the HEATING sub-function, which groups together all the information required for producing warm air,
–the PASSENGER COMPARTMENT VENTILATION sub-function, which groups together all the information
relating to ventilation, distribution and air distribution within the passenger compartment.
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Fault finding – Introduction62B
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Vdiag No.: 44
The conformity check for the air conditioning function is split into two parts:
1/ All information relating to the sensors and actuators controlled by the climate control panel (distribution motor,
mixing motor, recirculation motor, passenger compartment ventilation, etc.) is given in the conformity check for this
section.
2/ All information relating to the air conditioning function (information provided by several computers) is given in
the conformity check in section 62A Air conditioning.
Customer complaints - Fault finding chart
If the diagnostic tool check is correct, but the customer complaint persists, it should be dealt with according to the
Customer complaint.Note:
The interpretation of statuses, parameters and commands is also split into several sections. Everything which is
controlled by the control panel of the climate control function is dealt with in this section. However, signals from other
computers are interpreted in the fault finding sections of the computers which produce these signals.
A synopsis of the general procedure to follow is provided on the following
page in the form of a flow chart.
ACREG X84 1.1
Edition 2

62B - 5
CLIMATE CONTROL
Fault finding – Introduction62B
V3 MR-372-J84-62B000$010.mif
4. FAULT FINDING PROCEDURE
Check the battery charge and the
condition of the fuses
Print the system fault finding log
(available on CLIP and in the
Workshop Repair Manual or
Technical Note)
Connect CLIP
Dialogue
with Electronic
Control Unit?no
yes
Read the faults
Faults
presentno
yes
Deal with present faults
Deal with stored faults
The cause is
still presentnoFault
solved
yes
Conformity check
The cause is
still presentnoFault
solved
Use the fault finding
charts
The cause is
still presentnoFault
solved
Contact Techline with the
completed fault finding log
Vdiag No.: 44
See ALP 1
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Edition 2

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Fault finding – Introduction62B
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Vdiag No.: 44
You will always be asked for this sheet:
●When requesting technical assistance from the Techline.
●For certification requests when replacing parts that must be certified.
●To be enclosed when returning monitored parts on request. The log is needed for warranty compensation, and
enables better analysis of the removed parts.
6. SAFETY ADVICE
All work on components requires obeying safety rules to prevent physical damage or human injury:
–Make sure that the battery is properly charged to avoid damaging the computers with a low charge.
–Do not smoke.
–Use the appropriate tools.
5. FAULT FINDING LOG
WARNING!IMPORTANT
Any fault on a complex system call for thorough fault finding with the appropriate tools. The
FAULT FINDING LOG, which should be completed during the fault finding procedure, ensures a
record is kept of the procedure carried out. It is an essential document when consulting the
manufacturer.
IT IS THEREFORE COMPULSORY TO COMPLETE A FAULT FINDING LOG
EVERY TIME
A FAULT FINDING PROCEDURE IS PERFORMED.
ACREG X84 1.1
Edition 2

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 - 8
CLIMATE CONTROL
Fault finding – System operation62B
V3 MR-372-J84-62B000$020.mif
Vdiag No.: 44
SUMMARY OF ITEMS CONTROLLED OR OPERATED BY THE CLIMATE CONTROL COMPUTER:
Ventilation and air conditioning unit
Passenger
compartment
blower
Vehicle multiplex
network
Passenger
compartment
blower power
moduleRecirculatio
n motorDistribution
motorMixing
motorInternal
temperature
sensor Solar sensor
Actuator control Sensor management
Climate control computer (control panel)
Climate control
management
(hot and cold)User requests
management
(buttons pressed) Button lighting
Key:
Wire connections =
Multiplex connections =
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Edition 2

62B - 9
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Fault finding – Allocation of computer tracks62B
V3 MR-372-J84-62B000$030.mif
Vdiag No.: 44
CLIMATE CONTROL
Fault finding – Allocation of computer tracks
Allocation of climate control computer tracks.
Computer
tracksFunctions Sensor - actuator tracks
Connector A
1CAN L
2not used
3not used
4solar sensor signal track 2 of the solar sensor
5interior temperature sensor signal track 4 of the interior temperature sensor
6computer earth
7CAN H
8not used
9+ 12 V side lightsleft-hand side light fuse in the Protection and Switching
Unit (7.5 A)
10 + 12 V accessories feed passenger compartment fuse (15 A)
11 + 12 V before ignition feed passenger compartment fuse (20 A)
12 0 V sensors (solar, interior temperature)track 1 of the solar sensor and track 5 of the interior
temperature sensor
Connector B
1recirculation motor control track 5 of the recirculation motor
2not used
3not used
4not used
5not used
6not used
7passenger compartment blower module
controltrack 6 of the passenger compartment blower module
6-track connector
812 V supply of the mixing and distribution
motorstrack 2 of the mixing and distribution motors
9not used
10 recirculation motor control track 6 of the recirculation motor
11 distribution motor control track 1 of the distribution motor (coil B2)
12 distribution motor control track 6 of the distribution motor (coil A2)
13 distribution motor control track 3 of the distribution motor (coil B1)
14 distribution motor control track 4 of the distribution motor (coil A1)
15 mixing motor controltrack 1 of the mixing motor for B and C84 and track 3
of the mixing motor for J84 (B2 winding)
16 mixing motor control track 6 of the mixing motor (A2 winding)
17 mixing motor controltrack 3 of the mixing motor for B and C84 and track 1
of the mixing motor for J84 (B1 winding)
18 mixing motor control track 4 of the mixing motor (A1 winding)
ACREG X84 1.1
Edition 2
MR-372-J84-62B000$030.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