2010 RENAULT SCENIC fault

6Air conditioning
V4 MR-372-J84-62A000$TOC.mif
V4
62A
"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."
V4
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. 2010
AIR CONDITIONING
Manual air conditioning and Climate control
ABBREVIATIONS 62A - 2
Fault finding - Introduction 62A - 3
Fault finding - Function architecture 62A - 7
Fault finding - Mode of operation 62A - 8
Fault finding - Configurations and configuration reading 62A - 16
Fault finding - Conformity check 62A - 17
Fault finding - Customer complaints 62A - 43
Fault finding - Fault Finding Chart 62A - 45

62A - 2
AIR CONDITIONING
ABBREVIATIONS62A
V4
Manual air conditioning
and
Climate control
ABBREVIATIONS MEANING OF ABBREVIATION
ABS systemAnti-lock braking system
Fault Finding Chart Fault Finding Chart
APCAfter ignition
AVCBefore ignition feed
BVAAutomatic gearbox
Manual gearboxManual gearbox
BVRSequential gearbox
CANController Area Network
ACAir conditioning
CDCompact disc
PASPower assisted steering (hydraulic)
DAEElectric power assisted steering
DVDDigital versatile disc
DTCFault finding code
EGRExhaust gas recirculation
ESPElectronic Stability Program
GMVFan assembly
CNGCompressed natural gas
LPG Liquefied petroleum gas
HLEHigh yield strength
MAGMetal active gas (for welding steel)
MIGMetal inert gas (for welding aluminium)
MRWorkshop repair manual
TNTechnical Note
OBDOn board diagnostics
SERResistance spot welding
SSPPTyre pressure monitoring system
THLEVery high-tensile strength
TMLabour time
UCHUCH
UPCProtection and switching unit
UCTRoof control unit
UHLEUltra high yield strength
VINVehicle identification number
162AAIR CONDITIONING
ABBREVIATIONS
MR-372-J84-62A000$010.mif

62A - 3
AIR CONDITIONING
Fault finding - Introduction62A
V4
Manual air conditioning
and
Climate control162AAIR CONDITIONING
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 document and the Technical Notes for the injection fitted to the
vehicle, the UCH and the Protection and Switching Unit:
–Assisted fault finding (integrated into the diagnostic tool), Dialogys.
Wiring Diagrams:
–Visu-Schéma (CD-ROM), paper version.
Type of diagnostic tools
–CLIP
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, entry level, 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,
–connect the diagnostic tool and perform the desired operations.
To cut off + after ignition feed, 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: Scenic II
Function concerned: air conditioning
SPECIAL TOOLING REQUIRED
Multimeter
Elé. 1681Universal bornier
Note:
The left-hand and right-hand xenon bulb computers are powered when the dipped beam headlights light up. Fault
finding procedures can only be carried out on them after the ignition has been switched on in fault finding mode
(forced + after ignition feed) and the dipped headlights are on.
CLIM X84 1.1
Edition 2
MR-372-J84-62A000$020.mif

62A - 4
AIR CONDITIONING
Fault finding - Introduction62A
V4
Manual air conditioning
and
Climate control
Faults
Faults are declared either present or stored (depending on whether they appeared in a certain situation and have
disappeared since, or whether they remain 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 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 for these lines (for oxidation, bent pins, etc),
–the resistance of the component detected as faulty,
–The condition of the wires (insulation melted or split, 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 inconsistent. Therefore, this phase 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 features 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 climate control system
The air conditioning system conformity check is divided into four parts. The parts relate to the four air conditioning
subsystems, heater, cold loop, user selection and passenger compartment ventilation.
The statuses and parameters related to these sub-functions are listed with their respective computers.
NOTE: the manual air conditioning control panel does not control electrical components and cannot be subjected to
fault finding. Therefore, there is no conformity check in the 62C Manual air conditioning section.
Customer complaints – Fault finding charts
If the test with the diagnostic tool is OK, but the customer complaint persists, the fault should be treated by
customer complaints. Note:
The interpretation of statuses, parameters and commands is also split into several sections. Everything controlled
by the air conditioning control panel is explained in the two Air conditioning sections, 62A and 62B. By contrast,
signals from other computers are explained in the "fault finding" sections for these computers (see the conformity
check).
A synopsis of the general procedure to follow is provided on the following
page in the form of a flowchart.
CLIM X84 1.1
Edition 2
MR-372-J84-62A000$020.mif

62A - 5
AIR CONDITIONING
Fault finding - Introduction62A
V4
Manual air conditioning
and
Climate control
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
no
Faults present
yes
Deal with present faults
Deal with stored faults
The cause is still
presentnoFault
solved
yes
See fault finding chart 1
Conformity check
The cause is still
presentnoFault
solved
Use fault finding charts (ALPs)
The cause is still
presentnoFault
solved
Contact Techline with the
completed fault finding log
CLIM X84 1.1
Edition 2
MR-372-J84-62A000$020.mif

62A - 6
AIR CONDITIONING
Fault finding - Introduction62A
V4
Manual air conditioning
and
Climate control
5. FAULT FINDING LOG
You will always be asked for this report:
●when requesting technical assistance from the Techline.
●for approval requests when replacing parts for which approval is obligatory.
●to be enclosed when returning monitored parts on request. The log is needed for warranty reimbursement, and
enables better analysis of the parts removed.
6. SAFETY ADVICE
All work on components requires that the safety rules be obeyed to prevent damage or injury:
–Make sure the battery is properly charged to avoid damaging the computers with a low load.
–Use the appropriate tools.IMPORTANT:
Any fault on a complex system requires 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.
CLIM X84 1.1
Edition 2
MR-372-J84-62A000$020.mif

62A - 7
AIR CONDITIONING
Fault finding - Function architecture62A
V4
Air conditioning system design
The air conditioning system uses four computers. The four computers are connected by the multiplex system, except
in the case of manual air conditioning, where the connection between the air conditioning control panel and the UCH
is by normal wiring.
The air conditioning control panel interprets the driver's wishes and transmits them to the other computers; it also
manages the passenger compartment ventilation, air distribution, air mixing and air recirculation.
The UCH transmits the request to engage the air conditioning compressor to the injection and controls the operation
of the passenger compartment heating resistors (RCH).
The injection receives the refrigerant fluid pressure signal from the pressure sensor. The injection computer
authorises or inhibits the request to engage the compressor depending on how the vehicle is operating and transmits
the signal to the Protection and Switching Unit (UPC).
The role of the UPC is to manage the power section of the air conditioning system. It controls the engagement of the
compressor, the engine cooling fan units and the heated rear screen.
GLOSSARY
RCH = passenger compartment air heating resistors
AC control panelUCH
–interpretation of driver's
wishes
–passenger compartment
ventilation management
–air distribution management
–air mixing management–passenger compartment air
heating resistors operation
management
UPC
(Power and Switching Unit)Injection computer
–engine unit management
–
compressor control
–
heated rear screen control–air conditioning authorisation
Manual air conditioning
and
Climate controlAIR CONDITIONING
Fault finding - Function architecture
CLIM X84 1.1
Edition 2
MR-372-J84-62A000$030.mif

62A - 8
AIR CONDITIONING
Fault finding - Mode of operation62A
V4MR-372-J84-62A000$010.mif
Manual air conditioning
and
Climate controlAIR CONDITIONING
Fault finding - Mode of operation
General operation
The air conditioning system is composed of four sub-functions: heating, cold loop, passenger compartment
ventilation and user selection. Fault finding on the climate control is performed in two different ways using the
diagnostic tool.
The first procedure is by computer fault finding which makes it possible to communicate with just one computer
(select the computer concerned). The second procedure consists of performing fault finding by function which
allows communications to be established with all four computers of the AIR CONDITIONING function.
Description of the subsystems
Heating subsystem: this subsystem includes everything relating to the production of warm air in the vehicle and
management of the heated rear screen.
The main computers involved are the climate control computer (air mixing and blown air setpoint) and the UCH
(control and management of the passenger compartment heating resistors). The Protection and Switching Unit
controls the heated rear screen (and heated door mirror). The injection computer is only included in this subsystem
to supply the signals required for its management.
Cold loop subsystem: this subsystem includes everything involved in the vehicle's production of cold air.
The computers concerned are the climate control computer for air mixing, the injection computer to authorise
compressor engagement and the UPC to control the compressor and the engine fan units. On climate control
systems, the UCH merely transmits the request to engage the compressor from the climate control computer to the
injection computer.
On manual air conditioning systems, the UCH authorises or inhibits transmission of the request to engage the
compressor from the climate control computer to the injection computer depending on the status of the passenger
compartment blower (with manual air conditioning, the UCH receives and manages the passenger compartment
blower speed signal: compressor engagement is inhibited if the fan is not running).
User selection subsystem: this subsystem includes everything used to transmit the user's requests (pressing
buttons). The computers concerned are the climate control computer for climate control systems and the UCH. The
two other computers are not used for manual air conditioning.
Passenger compartment ventilation subsystem (climate control systems only): this subsystem includes
everything involved in ventilation, air mixing, air recirculation and air distribution. Therefore, only the climate control
computer is involved.
CLIM X84 1.1
Edition 2
MR-372-J84-62A000$040.mif