1997 RENAULT SCENIC ECU

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GENERAL OPERATION
INTRODUCTION

The Renault Immobiliser system uses either Infra Red or Radio Frequency for Plip key
operation and transponder key technology for key entry and starting. The Infra Red and
RF systems uses a rolling code system to ensure the vehicle system cannot be
breached.

Activation of the Immobiliser system is indicated by the LED indicator in the Instrument
cluster. If there is a fault in the system, an emergency access code can be used to dis-
able the system using the central door locking button or key and the LED to enter the
code.

On petrol vehicles the immobiliser is carried out by the Fuel Injection system and on Die-
sel systems it is carried out by the coded solenoid valve.

The immobiliser system automatically sets itself after 10 minutes if both doors are closed,
this can be 30 minutes in other countries. If the ignition is switched OFF and one of the
front doors is opened, then the immobiliser sets itself after 1 minute, in other countries it
can be 10 minutes.

To disarm the system the doors must be locked and unlocked using the plip key func-
tions. Only 2 plips can be operated on this system.

The immobiliser key system operates independently of the Plip system. When the key is
turned to the Ignition OFF position the immobiliser activates after 10 seconds. This sys-
tem used 2 special matched keys with coded transponders.

The system comprises of Receiver aerial around the ignition lock, a decoder unit located
under the dashboard, which sends the decoding signal to the Fuel Injection computer or
coded solenoid valve, and the RED warning light.

Key programming and Plip programming can be performed using the AD100 and if the
relevant security code for the vehicle is available.

The security code is normally displayed in the front of the service book, if not can only be
obtained from a Renault dealer.

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GENERAL OPERATION
Coded Card
The coded card system was introduced for the latest Laguna models and eliminates the
use of 'ignition keys' and, optionally, 'door locking keys'. Instead of a key the driver has a
coded card that, optionally, unlocks the door and after insertion into a card reader, sets
self-retaining relays to supply the various systems/circuit in the vehicle (equivalent to the
ignition switch), deactivates the immobiliser to allow the vehicle to be started and unlocks
the electric steering lock. The code is a random rolling code to reduce the chances of
simulation.
The engine is started via an engine start/stop push switch, which when pushed will ener-
gize the starter. If pressed again the switch will stop the engine and removing the card
will break the retaining circuit to the main relay and the vehicle will shut down all systems
and circuits except any required to remain on, e.g. lighting circuits, hazard lights etc. The
following are the immobilizer functions:
• Decodes the signal from the card via the card reader
• Sends a signal to the electric steering column lock
• Communicates with the EMS-ECM
• Controls the immobilizer LED and the card reader light
• Communicates with the immobilizer
This system uses a multiplexing system to send data to peripheral devices, namely the
electric steering lock, diagnostic socket, EMS-ECM and the LED in the instrument pack.
All Systems

Each system has a visual indication of the immobilizer status but whether or not it has a
separate red LED to that of the EMS-ECM is dependent upon the system. If it shares and
LED with the EMS-ECM this will flash regularly when the immobilizer is active and is also
used to indicate acceptance of the security code numbers manually entered using the
door locking button. In general the following functions are indicated by the LED:
• Activation of the immobilizer
• Non recognition of the Coded Card or Coded Keys
• System fault
• Fault with the EMS-ECM immobilizer function
• Fault with the Electric Steering Lock (Coded Card only)
• Signal of entry into door locking remote control resynchronization mode (Decoder/
Multi Timer systems only)
• If a fault with the EMS-ECM immobilizer circuit occurs whilst the vehicle is in motion
the immobilizer LED will flash during deceleration and when at idle speed.

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SPECIAL FUNCTIONS
KEY PROGRAMMING—ALL SYSTEMS

ECU IDENTIFICATION
FAULT CODES
SPECIAL FUNCTIONS


DIAGNOSTIC MENU
PRESS ENTER KEY



From the main DIAGNOSTIC MENU se-
lect SPECIAL FUNCTIONS.










Select PROGRAM KEYS.










To enter the security code use the follow-
ing procedure :-

Press Û
Üto elect Number & Letter

Press Ù To Erase the previous selection

Press 8 To ENTER selection.

Press 8 To Finish PIN selection.

NOTE : RENAULT MEGANE USES 8
DIGIT SECURITY CODE, OTHER VEHI-
CLES USE 12 DIGIT.
> PROGRAM KEYS




DIAGNOSTIC MENU
PRESS ENTER KEY

SWITCH IGNITION OFF

SECURITY CODE

_ _ _ _ _ _ _ _ _ _ _ _


SWITCH IGNITION ON