2008 RENAULT SCENIC sensor

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-12
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-12V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
1.1.5 Principle of hands-free locking/unlocking:
1Passenger side optical sensors.
2Driver side optical sensors.
3Door handle and boot locking switches.
4Boot/rear screen opening switch.
5Access aerials.
6Opening element locking motors.
7Renault card.
a/ Main components of the hands-free function:
–Renault card,
–UCH,
–optical presence sensors located in the door handles,
–access aerials integrated in the door handles and the tailgate, *
–the locking switches incorporated in the door handles,
–opening element locking motors.
b/ Hands-free unlocking:
When a hand is detected inside a handle (interruption of one of the optical beams) or a press on the boot opening
switch is detected, the UCH sends a 125 kHz signal to the access aerials and interrogates the access zone (driver-
side aerial interrogated first). If the Renault card is in the access zone, it responds to the UCH at 433 MHz. If the
UCH authenticates the Renault card, it requests unlocking of the opening elements or boot-only locking motors.
Hands-free unlocking of the entire vehicle by stage:
1The user places his/her hand around one of the door handles and the optical sensor detects a presence.
2If the Renault card is not disabled in hands-free, the UCH sends a 125 kHz encrypted signal over the access
aerials (initial interrogation is of the aerials on the side of the handle activated).
3If the Renault card recognises the code, it responds to the UCH using a 433 MHz encrypted signal.
4The UCH confirms that the Renault card code is correct and activates the locking motors.
* (3 or 5 access aerials depending on the number of doors and the fabrication date of the vehicle)

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-13
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-13V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
Conditions required:
–Interruption of one of the optical beams in one of the handles or pressing the boot or rear screen opening switch.
–A vehicle card detected by the access aerials.
–No + after ignition feed on the vehicle.
–The card must not be hands-free disabled (a Renault card is disabled for hands-free starting and access if it was
present in the vehicle when it was locked; the card is no longer disabled if it is detected by any aerial during
unlocking).
Statuses available for the unlocking function:
The UCH receives the unlocking request when an optical beam is cut on one of the handles. The sensors' power
supply can be displayed using the ET054 Optical sensors supplied status.
Operation of the sensors can be viewed using statuses ET055 Driver's side front optical sensor, ET056 Driver's
side rear optical sensor, ET057 Passenger side front/rear optical sensors and boot switch status ET060 Tailgate
locking button. The status of the tailgate opening request is visible using status ET061 Tailgate opening request.
The status of the request to open the rear screen can be checked using status ET062 Rear screen opening request.
The power supply level on the vehicle can be viewed using ET014 Power supply level requested.
The AC037 Transmitting aerials fault finding command interrogates the aerials for an update of potential faults.
Commands AC032 Test driver's side external aerials, AC033 Test passenger side external aerials and AC034
Test boot external aerials are used to check each zone separately. When the card is in the interrogated zone, the
card reader flashes. The interrogation lasts 1 minute.
These commands are used to check the hands-free access zones around the vehicle and will operate even if the
hands-free card does not belong to the vehicle.
c/ Hands-free unlocking of the boot only:
When a press on the boot opening switch is detected, the UCH receives the signal requesting opening (ET061
Tailgate opening request). The UCH sends a 125 kHz signal to the access aerials.
If the Renault card is in the access zone (initial interrogation on the boot side, then interrogation of both sides of the
vehicle), it responds to the UCH at 433 MHz.
If the UCH authenticates the card, the UCH orders unlocking of the boot only.
d) Hands-free locking:
When a press on a door handle closing switch is detected, the UCH sends a 125 kHz signal to the access aerials. If
the Renault card is in the access zone, it responds to the UCH at 433 MHz. If the UCH authenticates the card (and if
the UCH cannot be detected in the hands-free starting zone), the UCH requests the locking motors to lock.
If, however, there is another card in the vehicle, locking will be possible, but the card left in the vehicle will
temporarily lose its hands-free access and hands-free starting functions until the next unlocking operation
(inhibition).

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-25
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-25V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
1.2.2 Unlocking/locking the steering column:
1Steering column lock
2multiplex line
3Supply
4Sensor Line
5Safety line
a/ Unlocking the steering column lock
Following authentication of the Renault card:
1/ The UCH sends a code to the electric steering column lock with an unlocking request via the multiplex network
(ET119 UCH request to steering column lock).
2/ If the electric steering column lock recognises the code, it unlocks and sends its unlocked status to the UCH
(ET073 Steering column lock sensor signal).
3/ When the UCH receives the "Steering column unlocking completed" signal, it orders the Protection and Switching
Unit to activate the + after ignition relay and the procedure continues.
The physical status of the column lock can be displayed by status ET072 Steering column lock and its
programming can be displayed by status ET071 Steering column lock blank.
The steering column lock remains locked if:
–There is excessive mechanical load on the steering column (e.g.: wheel jammed against a kerb),
–the battery voltage is too low,
–the power demanded by the column lock is too high (thermal protection of the column lock electric motor). Note:
After ignition feed can only be established if the steering column unlocking procedure is performed
correctly.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-28
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-28V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
1.3 SUB-FUNCTION: STARTING
The UCH manages the control section of the starting sub-function. For this function to operate normally, the
protection function must proceed correctly (immobiliser inactive ET046 Immobiliser).
In order to control the starter motor, the UCH requires the following status and parameter information to check that
the starting conditions have been met:
–Start button ET070 Start button.
–Clutch pedal position ET048 Clutch pedal position.
–Brake pedal position ET047 Brake pedal position.
–Automatic gearbox selector lever position ET108 Automatic gearbox selector lever position.
–Position of the manual gearbox selector lever (see 87G, Engine compartment connection unit, Conformity
check).
If the starting conditions are met, the request for the Protection and Switching Unit to activate the starter motor can
be viewed using status ET110 UCH request to injection or Protection and Switching Unit.
1.4 Main COMPONENTS of the ACCESS/SAFETY function
1.4.1 Main components of the ACCESS sub-function:
–Renault card,
–UCH,
–optical presence sensors located in the door handles,
–access aerials integrated in the door handles and the tailgate,
–the locking switches incorporated in the door handles,
–the boot-only opening/locking switch built into the boot badge,
–opening element locking motors.
1.4.1.1 The Renault card:
The Renault card has three buttons which allow:
–locking of the vehicle,
–unlocking of the vehicle,
–the boot to be locked/unlocked.
The Renault hands-free card allows hands-free operation if it is located in the access and starting zones.
The Renault card is powered by a 3 V battery. This battery is required for operation in hands-free mode or remote
control mode (card button presses).
If the battery is old or in an area of frequency interference, the emergency insert located in the Renault card allows
the driver's door to be unlocked.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-29
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-29V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
1.4.1.2 The UCH:
1.4.1.3 The optical presence sensors built into the door handles (hands-free vehicles):
The optical presence sensors inform the UCH of the hands-free unlocking request for the entire vehicle when the
infrared beam is cut in one of the handles (by a hand).
This presence detection starts the hands-free access procedure.
To limit battery use, the optical sensors are powered at 12 V only for 72 hours after the last change of vehicle
locked-unlocked status. After this period, the handle must be pulled to operate a switch* which "wakes up" the UCH
to resupply the optical sensors. In this case, pull the handle a second time to open the door once the card has been
authenticated.
The switch signal* is parallel to the optical sensor signal: activation of the optical sensor or the switch* earths the
signal going to the UCH. Although it is a switch*, the signal is not constant when pulling and holding the handle.
switch*: Switch.a) In hands-free mode, the UCH receives the unlocking request through the optical sensors, and the
locking request through the locking switches.
b) The UCH manages the exchanges with the Renault card.
In hands-free mode:
The UCH interrogates and authenticates the Renault card via the access aerials located in the door
handles and the tailgate, at a frequency of 125 KHz.
After authentication from the UCH, the Renault card responds directly to it at 433 MHz.
Outside hands-free mode:
The UCH receives the access requests coming from card presses at 433 MHz (315 MHz in Japan).
The 433 MHz reception aerial is incorporated in the UCH (except Scénic II fitted with the SSPP function).
The signals are encrypted.
c) The UCH activates the locking motors.
If the exchanges between the Renault card and the UCH are correct, the UCH activates the locking
motors.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-30
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-30V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
The handle groups are shown in the diagram below:
Communal sensor supply
Note:
The tailgate is not fitted with an infrared optical sensor. The boot and rear screen opening switches notify the UCH
of a request to open the boot or rear screen.
Optical
sensor
+
SwitchDriver's side
Passenger side
Optical
sensor
+
Switch
Optical
sensor
+
SwitchOptical
sensor
+
Switch
Boot unlocking

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-34
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-34V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
1.4.2.3 The electric steering column lock:
The electric steering column lock is controlled by the UCH. The steering column lock works by inserting and
removing a lock bolt. It replaces the Neimann type lock.
The steering column lock is powered outside + after ignition feed. The steering column lock supply is via the after
ignition relay (located in the Protection and Switching Unit) in its rest position, from where it is distributed to the
column lock by the UCH.
The UCH sends an unlocking request and a code to the steering column lock, via the vehicle's multiplex network.
The multiplex network unlocks the steering column lock if the code is recognised.
A sensor located on the column lock bolt informs the UCH, via the multiplex network and by wire connection, that it
is unlocked.
When unlocking is confirmed, the UCH activates the + after ignition feed via the Protection and Switching Unit. The
column lock is no longer supplied.
The column lock has a "+ after ignition feed present on vehicle" wire signal which inhibits locking while the feed is
active.
1.4.2.4 The injection computer:
The injection computer is coded and unlocks following the encrypted challenge exchange with the UCH.
1.4.2.5 The starting aerials (hands-free vehicles):
There are 3 transmitter aerials located in the passenger compartment. They are controlled by the UCH to interrogate
the card during a starting request or in confirming the presence of the card in the vehicle (e.g. after a door is
opened).
The power used allows the whole passenger compartment to be covered, including the boot. Overspill outside the
passenger compartment is minimal.
1.4.2.6 The card reader:
The card reader is connected to the UCH by a wire connection. It provides the transponder function (like a key
recognition ring). It therefore allows authentication of a Renault card without a battery.
If the card is not detected or recognised during hands-free starting, the card reader flashes to tell the customer to
insert the Renault card.IMPORTANT IMPORTANT
The steering column lock is:
–not removable when the bolt is disengaged,
–fitted with a left-hand thread self-shearing mounting bolt.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-35
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-35V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
1.4.3 Main components of the STARTING sub-function:
The starting sub-function is based on the following main factors:
–The starting conditions being present.
–Passenger Compartment Control Unit (UCH).
–The automatic gearbox computer (if fitted on the vehicle).
–The Protection and Switching Unit.
1.4.3.1 Start button:
The start button transmits the driver's requests to start or stop the engine to the UCH.
1.4.3.2 The UCH:
The UCH ensures that the starting conditions are met, and that no other computer on the multiplex network is
inhibiting starting of the vehicle.
If the conditions are met, it requests control of the starter from the UPC.
1.4.3.3 The Protection and Switching Unit (UPC):
The Protection and Switching Unit activates the starter motor following a request from the UCH via the multiplex
network.
1.4.3.4 Neutral sensor (manual gearbox):
Informs the UCH of the position of the gearbox (neutral or gear engaged).
1.4.3.5 Clutch switch (manual gearbox):
Sends clutch pedal depressed signal (end of travel) to the UCH.
1.4.3.6 Brake switch:
Sends brake pedal depressed signal to the UCH.
Operation:
The unknown status does not automatically require the brake pedal to be replaced, because it is a temporary
operating status between released pedal status and depressed pedal status (see diagram above).