relay RENAULT SCENIC 2003 J84 / 2.G General Information

FAULT FINDING INTRODUCTION
General method
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2 - Design innovations:
These innovations concern services which are already in use but which are implemented in a specific way on the
Scénic II:
AIR CONDITIONINGThis service is standard on RENAULT vehicles, only the distribution of tasks is
specific:
●Air conditioning: responsible for user intention (management of temperature for
controlled air conditioning) and for mixing and distribution of air in the passenger
compartment (manual and controlled air conditioning).
●UCH: responsible for the heating function.
●Injection: responsible for management of the air conditioning (cold cycle).
●Switching Protection Unit: responsible for the power required for air conditioning
(compressor and engine cooling fan).
WIPERSThe distribution of the function is as follows:
●UCH: responsible for driver's intention, management of the wiper stalk and the rear
screen wiper.
●Switching Protection Unit: responsible for the power required for the windscreen
wiper.
LIGHTINGThis function has already been described in Section 1 - Functional innovations. Refer
to this section for further information.
Note:
In the case of lighting without XENON bulbs, the Switching Protection Unit manages
the dipped headlights.
ENGINE
MANAGEMENT -
INJECTION This function is shared by two computers:●Injection: management of programming and information associated with engine
management, and of the speed regulation and limitation function.
●Protection and Communication Unit: management of the power required for engine
management. The Protection and Communication Unit also incorporates the fuel
pump relay and actuators controlled by cable by the injection computer.

FAULT FINDING INTRODUCTION
General method
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01E-6
Lastly, the Scénic II has a Protection and Switching Unit. The main functions of this computer are as follows:
VEHICLE POWER
SUPPLYThe main power relays of the vehicle are directly integrated into the Switching
Protection Unit (including the fuel pump relay and injection actuators).
POWER UNIT FOR
INJECTIONManagement of the starter motor, the air conditioning compressor and the engine
cooling fan.
POWER UNIT FOR
THE UCHManagement of lighting (combined with the Xenon bulbs) and window wipers.
POWER UNIT FOR
AIR CONDITIONINGManagement of the heated rear screen.