power steering RENAULT TWINGO RS 2009 2.G Electrical Equipment - Wipers, Washers Workshop Manual

85A-11
MR-413-X44-85A000$300_eng.mif
V1
WIPERS - WASHERS
Fault finding - Operating diagram85A
The vehicle has an automatic wiper function. To activate this function, place the combined wiper-washer in the
intermittent position.
If the car is put into reverse gear when the front wiper motor is in operation, the UCH commands operation of the rear
wiper.
The UCH controls the power supply to the wiper function. It controls the operation of the front wipers, the wiping
speed (intermittent, low-speed, high-speed) and the bi-directional front and rear screen wash pump.
The rain sensor requires an exterior temperature signal, as this enables activation of the wipers to be avoided at
temperatures which might have frozen the wipers.
Summary of the operation of the rain and light sensor
Steering column control,Rain and light sensor
...Interpretation of driver demands...Interpretation of the amount of rain
Front/rear washer pumpUCH
...Windscreen and rear screen
washing...Front and rear wiper management
...Operation management
Multiplex connections
Wire connections
Serial connections

85A-12
MR-413-X44-85A000$400_eng.mif
V1
85A
WIPERS - WASHERS
Fault finding - Function
The wiper function is divided into two sub-functions: Wiper command, Wiper power.
1. Wiper command
a) By the driver
The UCH receives the request from the driver using the steering column controls.
The UCH orders rear wiping when reverse gear is engaged, if the front wipers are active.
The steering column control supplies power directly to the front/rear washer pump.
The wiper intermittent speed ring allows the intermittent front wiping frequency to be altered.
b) By the rain sensor
The rain and light sensor is a single and unique sensor fitted in the windscreen. It is connected by a serial
connection to the UCH.
The rain sensor enables the wipers to be started automatically. It determines the wiping speed according to various
parameters (exterior temperature, vehicle speed, amount of rain, tunnel, night etc), and it informs the UCH, which
carries out the wiping command.
It is possible to view the status of the sensor using status ET114 "Wiper request by rain sensor".
The sensor configuration can be viewed by reading configuration LC044 "Rain/light sensor" and altered using
command CF035 "Rain/light sensor".
Configuration of the automatic headlight function is carried out using CF193 "Automatic headlight function". This
function can be viewed using LC095 "Automatic headlight function". The configuration CF194 "Automatic
headlight function" is also linked to activation of the headlight function. This function can be viewed using LC096
"Automatic headlight function".
2. Wiper power
The UCH controls the power supply to the wiper motors.
The operation of the rear screen wiper motor may be checked using command AC007 "Rear screen wiper" in the
UCH.
The correct functioning of the front wiper motor is checked using commands AC056 "Low speed wiper", AC057
"High speed wiper" and AC058 "Intermittent wiper" in the UCH.
MR-413-X44-85A000$400_eng.mif