2003 RENAULT SCENIC keyless

FAULT FINDING INTRODUCTION
General method
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Innovations to the Scénic II:
The innovations in Scénic II fall into three categories:
1 - Functional innovations:
The main functional innovations on the vehicle are as follows:
FUNCTIONAL
INNOVATIONS This section describes the new services present on the vehicle and their integration on
the vehicle.
ARCHITECTURAL
INNOVATIONS This section describes the distribution of the main functions and the new computers
fitted to the vehicle.
FAULT FINDING
INNOVATIONS This section describes the fault finding changes implemented on the Scénic II in order
to:
●Allow fault finding on the multiplex network of the vehicle (vehicle to diagnostic tool
connection sensor).
●Develop and complement multiplex network fault finding functions (physical
measurements of the type of fault, fault finding assistance etc.).
●Mask the diversity and complexity of vehicle functions: fault finding by function, multi-
computers, etc.
KEYLESS VEHICLE
(access, protection -
de-protection and
hands-free starting)This function is provided by the following computers:
●UCH: responsible for access and vehicle protection (immobiliser).
●Steering lock: participates in vehicle protection (electromechanical locking of the
steering column).
●Injection: responsible for vehicle protection (immobiliser) and control of the starter
motor.
●Protection and Switching Unit: responsible for the power supplied to the starter motor
at the request of the UCH, and for injection management.
ELECTRONIC
STABILITY
PROGRAMThis function is provided by the following computers:
●Anti-lock braking system - electronic stability program: responsible for the trajectory
analysis function by means of the speed sensors, the yaw sensor, the transverse
acceleration sensor and the steering wheel angle (driver's intention: signal sent by
the electric power assisted steering).
●Injection: management of engine torque in order to correct the trajectory at the
request of the electronic stability program or automatic transmission.
●Automatic transmission: translation (shared with the injection computer) of driver's
intention, sends torque requests to the injection computer.

FAULT FINDING INTRODUCTION
General method
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–Testing other computers that support fault finding: this test consists of connection and identification of
the computers present on the vehicle which can support fault finding K / L lines.
●New fault finding topics: the fault finding topics are now split into two separate menus:
–Computer diagnosis:
similar to the existing fault finding topics apart from the changed menu presentation.
The states and parameters menus have been modified to allow simultaneous display of these data items
and divided into screens by function and sub-function (example: "ignition" sub-function in Injection).
In addition, the computer fault finding procedure allows access to the vehicle "repair" menu when replacing
parts to be matched with the vehicle (configuration, programming).
–Fault finding by function:
limited to computer fault finding present on the multiplex network of the vehicle
and to the keyless vehicle, air conditioning and tyre functions. This new type of fault finding allows an
overall diagnosis of a function to be made by simultaneous dialogue with all the computers involved in
providing the service. In this way, it is possible to simultaneously analyse all the components associated with
a function and also simultaneously supervise intersystem exchanges between the computers responsible
for a customer service.
Note:
In the event of detecting a faulty component, it is necessary to switch to computer fault finding mode to
perform the configuration operations - programming the replaced part.
If a function fault is detected, a physical part is replaced: hence the choices made concerning
navigation of the diagnostic tool.

FAULT FINDING INTRODUCTION
General method
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Summary list of the computers and functions present on the Scénic II vehicle:
Computer name InstallationFault finding Main function Fault finding sub-
functions
Parking
assistance Optional
●Tool
●K / L lines
●"Backup radar" type
function with beeperNone
AirbagStandard
●Tool
●Multiplex network
●Passive protection by
deployment of airbagsNone
Anti-lock
braking systemStandard
●Tool
●Multiplex network
●Anti-lock braking in braking
phaseNone
Automatic
gearboxOptional
●Tool
●K / L lines (although
present on the
multiplex network)
●Automatic gear change
depending on driver
intentionNone
Driving school
unitOptional
●Self-diagnostic
●Multiplex network
●Management of the "dual
control" systemNone
Manual or
automatic air
conditioning Optional
●Manual air
conditioning cannot
support fault finding
●Tool for automatic
air conditioning
●Multiplex network
●Air conditioning: user
intention and passenger
compartment air
distributionAir conditioning
Electric power
assisted
steeringStandard
●Tool
●Multiplex network
●Power assisted steering Supplies the
steering wheel angle
to the electronic
stability control
program
Electronic
stability control
program
(including anti-
lock braking
system)Optional
●Tool
●Multiplex network
●Anti-lock braking function
●Electronic stability and
understeer programNone
Automatic
parking brakeOptional
●Tool
●K / L lines (although
present on the
multiplex network)
●Automatic parking brake
control while stopping and/
or startingNone
InjectionStandard
●Tool
●Multiplex network
●Engine management
computerKeyless vehicle
Air conditioning
LPG / NGVOptional
●Tool
●K / L lines (although
present on the
multiplex network)
●Injection management
LPG / VNGNone
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FAULT FINDING INTRODUCTION
General method
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Computer name InstallationFault finding Main function Fault finding sub-
functions
Discharge bulb
(domain:
discharge bulb)Optional
●Tool
●K / L lines
●Position and management
of the dipped headlightsNone
Central
Communication
Unit (Carminat)Optional
●Self-diagnostic
●Multiplex network
●Satellite navigation None
UCHStandard
●Tool
●Multiplex network
●Management of access and
the passenger
compartmentKeyless vehicle
Air conditioning
Tyres
Switching
Protection UnitStandard
●Tool
●Multiplex network
●Output management
(mainly engine
compartment)Keyless vehicle
Air conditioning
Instrument
panelStandard
●Tool
●Multiplex network
●Display of vehicle
informationTyres
Steering
column lockStandard
●Does not support
fault finding
(supervised by
the UCH)
●Multiplex network
●Immobilisation of the
steering column (vehicle
protection)Keyless vehicle
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