RENAULT TWINGO 2009 2.G Heating And Air Conditioning - Heating Workshop Manual

Heating and
air conditioning system
"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."
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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.
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HEATING
Fault finding - Introduction 61A - 2
Fault finding - List and location of components 61A - 5
Fault finding - Role of components 61A - 6
Fault finding - Function 61A - 8
Fault finding - Conformity check 61A - 11
Fault finding - Customer complaints 61A - 18
Fault finding - Fault finding charts 61A - 19
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HEATING
Fault finding - Introduction
1. SCOPE OF THIS DOCUMENT
This document presents the fault finding procedure applicable to the heating function with the following
specifications:
2. PREREQUISITES FOR FAULT FINDING
Documentation type
Fault finding procedures (this manual):
–Assisted fault finding (integrated into the CLIP diagnostic tool),
Wiring Diagrams:
–Visu-Schéma (CD-ROM), paper.
Special tooling required
3. REMINDERS
This heating system does not have a computer and therefore fault finding cannot be carried out on the system using
the diagnostic tool.
In this section, the fault finding procedure is dealt with by Customer complaints - Fault finding charts. Vehicle(s): New Twingo
Function concerned: Heating
Special tooling required
Multimeter and current clamp
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Fault finding - Introduction61A
4. FAULT FINDING PROCEDURE
Wiring check
Fault finding problems
Disconnecting the connectors and/or manipulating the wiring harness may temporarily remove the cause of a fault.
Electrical measurements of voltage, resistance and insulation are generally correct, especially if the fault is not
present when the analysis is made (stored fault).
Visual inspection of the connection:
●Check that the connector is connected correctly and that the male and female parts of the connection are
correctly coupled.
Visual inspection of the area around the connection:
●Check the condition of the mounting (pin, strap, adhesive tape, etc.) if the connectors are attached to the vehicle.
●Check that there is no damage to the wiring trim (sheath, foam, adhesive tape, etc.) near the wiring.
●Check that there is no damage to the electrical wires at the connector outputs, in particular on the insulating
material (wear, cuts, burns, etc.).
Disconnect the connector to continue the checks.
Visual inspection of the plastic casing:
●Check that there is no mechanical damage (casing crushed, cracked, broken, etc.), in particular to the fragile
components (lever, lock, openings, etc.).
●Check that there is no heat damage (casing melted, darker, deformed, etc.).
●Check that there are no stains (grease, mud, liquid, etc.).
Visual inspection of the metal contacts:
(The female contact is called CLIP. The male contact is called TAB.)
●Check that there are no bent contacts (the contact is not inserted correctly and can come out of the back of the
connector). The spring contact of the connector when the wire is gently pulled.
●Check that there is no damage (folded tabs, clips open too wide, blackened or melted contact, etc.).
●Check that there is no oxidation on the metal contacts. Note:
Carry out each requested check visually. Do not remove a connector if it is not required.
Note:
Repeated connections and disconnections alter the functionality of the connectors and increase the risk of poor
electrical contact. Limit the number of connections/disconnections as much as possible.
Note:
The check is carried out on the 2 parts of the connection. There may be two types of connections:
–Connector / Connector
–Connector / Device

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Fault finding - Introduction61A
Visual inspection of the sealing:
(Only for watertight connectors)
●Check for the seal on the connection (between the 2 parts of the connection).
●Check the seal at the back of the connectors:
–For unit joints (1 for each wire), check that the unit joints are present on each electrical wire and that they
are correctly positioned in the opening (level with the housing). Check that plugs are present on openings
which are not used.
–For a grommet seal (one seal which covers the entire internal surface of the connector), check that the
seal is present.
–For gel seals, check for gel in all of the openings without removing the excess or any protruding sections
(it does not matter if there is gel on the contacts).
–For hotmelt sealing (heat-shrink sheath with glue), check that the sheath has contracted correctly on the
rear of the connectors and electrical wires, and that the hardened glue comes out of the side of the wire.
●Check that there is no damage to any of the seals (cuts, burns, significant deformation, etc.).
If a fault is detected, repair or replace the wiring (see Technical Note 6015A, Repairing electrical wiring, Wiring:
Precautions for repair).
5. FAULT FINDING LOG
You will always be asked for this log:
●when requesting technical assistance from Techline,
●for approval requests when replacing parts for which approval is mandatory,
●to be attached to monitored parts for which reimbursement is requested. The log is needed for warranty
reimbursement, and enables better analysis of the parts removed.
6. SAFETY INSTRUCTIONS
Safety rules must be observed during any work on a component to prevent any damage or injury:
–check the battery voltage to avoid incorrect operation of computer functions,
–do not smoke,
–use the proper tools. IMPORTANTIMPORTANT
Any fault on a complex system requires thorough fault finding with the appropriate tools. The
FAULT FINDING LOG, which should be completed during the procedure, enables you to keep
track of the procedure which is carried out. It is an essential document when consulting the
manufacturer.
IT IS THEREFORE MANDATORY TO FILL OUT A FAULT FINDING LOG EACH TIME FAULT FINDING IS
CARRIED OUT

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Fault finding - List and location of components
Passenger Compartment Heating Resistor (RCH) location
1Without Passenger Compartment Heating Resistors (RCH)
2With Passenger Compartment Heating Resistors (RCH)
Passenger compartment fan unit
●HEATING COMPONENTS
–Heater matrix: This is located at the bottom of the heating and air conditioning unit.
–Passenger compartment heating resistors: These are located at the bottom of the heater matrix on the
driver's side (depending on the equipment).
●ACTUATORS
–Air distribution flap: This is located in the heating and air conditioning unit.
–Air mixing flap: This is located in the heating and air conditioning unit.
–Recirculation flap: This is located behind the dashboard.
●OTHERS
–Passenger compartment blower unit: This is located in the heating and air conditioning unit.
–Air pipes: Theses are located under the dashboard.
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HEATING COMPONENTS
–Heater matrix:
The external air entering the heating and air conditioning device (HVAC) is heated by the heater matrix.
–Passenger Compartment Heating Resistors (depending on version):
The passenger compartment heating resistors are an electric heating system located in the passenger compartment
ventilation heating unit. This system acts as an additional heater which operates when the engine is cold (when
starting).
Passenger Compartment Heating Resistors (RCH)
●ACTUATORS
–Air distribution flap:
This flap enables the air flowing into the passenger compartment to be directed.
–Air mixing flap:
This flap enables the temperature requirements of the occupants to be met.
–Recirculation flap:
This flap prevents the entry of exterior air. In this case, the passenger compartment is isolated from the exterior and
air is blown in the passenger compartment in a closed circuit.
●OTHERS
–Passenger compartment blower unit:
The passenger compartment blower unit is controlled by the MVPR (Resistive Blower Dimmer Module).
HEATING
Fault finding - Role of components
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Fault finding - Role of components61A
Resistive Blower Dimmer Module (MVPR)
1Thermal fuse
2Fan assembly connector
3Connector to Control panel
–Air pipes:
The air flows into an open air inlet scoop towards the exterior. There must be enough air flow for it to be channelled
into the passenger compartment. This flow can be created by the vehicle speed (in non-recirculation mode) or by
activating the blower. The air flowing into the passenger compartment is protected by a grille and a rain shield in
order to prevent foreign bodies and water from entering. The air is then distributed inside the passenger
compartment.
Passenger compartment air pipes
1Air inlet
2De-icing
3Right-hand air vent
4Left-hand air vent
5Centre air vents
6Left-hand footwell vent
7Right-hand footwell vent

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Fault finding - Function
Summary of components controlled by the heating control panel and passenger compartment fan:
Ventilation unit
Passenger com-
partment blower
Resistor unitRecirculation
flapDistribution flapMixing flap
Actuator control
User control panel
User request
management (heated
rear screen button
pressed)
Button lighting (heated
rear screen button)
Passenger
compartment blower
operation signal
(running or stopped)
UCH
Transmission of the
request to switch on
the heated rear screen
Key:
Wire connections =
Multiplex connections =
Mechanical connections =
(Cable controls)
Vehicle
multiplex
network
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Fault finding - Function61A
Summary diagram of components controlled or managed by the UCH:
Summary diagram of components controlled or managed by the injection computer:Rear screen de-icing and
rear-view mirror de-icer
(depending on version)External temperature sensor
(depending on version)
Actuator controlSensor management
UCH
Heated rear screen control
management
Relay No. 1 for the
Passenger
Compartment
Heating resistorsRelay No. 2 for
the Passenger
Compartment
Heating
resistorsEngine cooling
fan assemblyEngine coolant
temperature sensor
Actuator controlSensor
management
Engine injection computer
Management of the additional heater (heater resistor control) depending on the equipment
Key:
Wire connections =
Multiplex connections =
Vehicle
multiplex
network

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Fault finding - Function61A
Layout of the heating function:
The passenger compartment ventilation heating panel enables:
–the passenger compartment blower unit to be activated,
–the rear de-icing to be activated by the UCH.
The passenger compartment ventilation heating panel controls the air distribution, mixing and recirculation flaps by
cables. It controls the blower unit speed via a wire connection and a resistor unit (MVPR).
The injection computer controls the passenger compartment heating resistors (depending on the equipment).
The injection computer authorises or denies compressor activation depending on the vehicle operation and
refrigerant pressure.
Passenger compartment ventilation and heating control front panel
Passenger compartment ventilation and heating control rear panel