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

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.
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 - 9
CLIMATE CONTROL
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

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-15
CLIMATE CONTROL
Fault finding – Interpretation of faults62B
V3 MR-372-J84-62B000$060.mif
Vdiag No.: 44
DF007
PRESENT
OR
STOREDINTERIOR TEMPERATURE SENSOR CIRCUIT
CC.0 : Short circuit to earth
CO.1 : Short circuit or open circuit to + 12 V
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:
–switching on the ignition and switching on the climate control.
Special notes:
The internal temperature sensor (linked to a micro-turbine, depending on vehicle
equipment) is located at the top of the roof in the unit underneath the rear view mirror.
Check the connection and condition of the internal temperature sensor connector.
Replace the connector if necessary.
With the ignition on ("forced" + after ignition: see Introduction), check that the temperature sensor micro-
turbine is working correctly.
If it is not working, check for the presence of +12 V on track 1 of the temperature sensor connector and an
earth on track 3.
If the micro-turbine supply is correct and the micro-turbine does not operate, replace the component: sensors
+ micro-turbine (the micro-turbine is not available as a separate part).
Disconnect connector A (12-track) from the climate control computer in order to check the insulation,
continuity and absence of interference resistance on the connections:
Computer connector A track 5 Track 4 of the internal temperature sensor
Computer connector A track 12 Track 5 of the internal temperature sensor
Track 1 of the solar radiation sensor
Repair if necessary.
Check the resistance value of the sensor between:
track 4 and track 5 of the internal temperature sensor connector. Replace the sensor if the resistance is not:
10 kΩΩ Ω Ω

±± ± ±
500 ΩΩ Ω Ω
at 25˚C (for more details, refer to the electrical specifications of the sensor according to
temperature in the Help section).
If the fault is still present, replace the internal temperature sensor.
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

62B-16
CLIMATE CONTROL
Fault finding – Interpretation of faults62B
V3 MR-372-J84-62B000$060.mif
Vdiag No.: 44
DF010
PRESENT
OR
STOREDMIXING MOTOR CIRCUIT
CO.0 : Open circuit or short circuit to earth
CC.1 : Short circuit to + 12 V
NOTESConditions for applying the fault finding procedure to stored faults:
The fault is declared present after:
–switching the climate control panel on and pressing the temperature control
(minimum or maximum temperature request).
Special notes:
–After repairing the fault (when the fault switches from "present" to "stored"), wait for
1 minute before the climate control computer is able to control the distribution motor.
To avoid having to wait, switch the ignition off and then back on again.
–There is no specific programming operation for the mixer motor, however, after it has
been replaced, the motor needs to program its limits (minimum and maximum).
Check the connection and condition of the connector for the mixing motor.
Replace the connector if necessary.
Disconnect connector B (18-track) from the climate control computer in order to check the insulation,
continuity and the absence of interference resistance of the following connections:
For all Mégane vehicles:
Computer connector B track 18 Track 4 of the mixing motor
Computer connector B track 8 Track 2 of the mixing motor
Track 2 of the distribution motor
Computer connector B track 16 Track 6 of the mixing motor
For Mégane vehicles other than Scénic:
Computer connector B track 17 Track 3 of the mixing motor
Computer connector B track 15 Track 1 of the mixing motor
For Mégane Scénics:
Computer connector B track 17 Track 1 of the mixing motor
Computer connector B track 15 Track 3 of the air mixing flap motor
Repair if necessary.
AFTER REPAIRClear the fault memory.
Follow the instructions to confirm repair.
If the motor has been replaced, refer to the Configurations and Programming
section.
Deal with any other faults.
ACREG X84 1.1
Edition 2

62B-17
CLIMATE CONTROL
Fault finding – Interpretation of faults62B
V3 MR-372-J84-62B000$060.mif
Vdiag No.: 44
DF010
CONTINUED
With the climate control computer connector connected and the ignition on ("forced" + after ignition: see
Introduction) check that there is a 12 V supply on track 2 of the mixing motor connector. If the supply is not
present and if no faulty connections are detected during the continuity checks: contact your Techline.
With the connector disconnected, check the resistance value of the mixer motor by measuring between:
track 2 and track 1 of the mixing motor connector,
track 2 and track 3 of the mixing motor connector,
track 2 and track 4 of the mixing motor connector,
track 2 and track 6 of the mixing motor connector.
For the four checks, a value of 100 ΩΩ Ω Ω
± 5 ΩΩ Ω Ω
at 20˚C should be obtained. Replace the mixer motor if this is not
the case.
If the fault is still present with the mixing motor removed but electrically connected, carry out a motor command
using the temperature buttons on the control panel: switch the temperature setting to maximum hot position
"27˚" (a value of 100%) then switch the temperature setting to maximum cold position "15˚" (a value of 0%).
The motor should switch from one direction to the other.
If the connections checked previously are correct but the motor does not switch during the commands: replace
the mixing motor.
If the commands have been performed correctly, check that the mixing flap motor is not jammed by trying to
move the mechanism.
Repair if necessary.
If the fault is still present, replace the mixing motor.
AFTER REPAIRClear the fault memory.
Follow the instructions to confirm repair.
If the motor has been replaced, refer to the Configurations and Programming
section.
Deal with any other faults.
ACREG X84 1.1
Edition 2