2008 RENAULT SCENIC lock

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Introduction87B
87B-5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Introduction87B
87B-5V9 MR-372-J84-87B000$043.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
4. FAULT FINDING PROCEDURE (continued)
Wiring check
Fault finding problems
Disconnecting the connectors and/or manipulating the wiring harness may temporarily remove the cause of a fault.
Electrical measurements of voltage, resistance and insulation are generally correct, especially if the fault is not
present when the analysis is made (stored fault).
Visual inspection
Look for damage under the bonnet and in the passenger compartment.
Carefully check the fuses, insulators and wiring harness routing.
Look for signs of oxidation.
Physical inspection
While manipulating the wiring harness, use the diagnostic tool to note any change in fault status from stored to
present.
Make sure that the connectors are properly locked.
Apply light pressure to the connectors.
Twist the wiring harness.
If there is a change in status, try to locate the source of the fault.
Inspection of each component
Disconnect the connectors and check the appearance of the clips and tabs, as well as the crimping (no crimping on
the insulating section).
Make sure that the clips and tabs are properly locked in the sockets.
Check that no clips or tabs have been dislodged during connection.
Check the clip contact pressure using an appropriate model of tab.
Continuity, insulation and resistance check
Check the continuity of entire lines, then section by section.
Look for a short circuit to earth, to + 12 V or with another wire.
If a fault is detected, repair or replace the wiring harness.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-8
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-8V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
The ACCESS/SAFETY function is divided into three sub-functions: Access, Protection and Starting.
The maximum number of Renault cards which can be programmed on the vehicle is 4. There is no master Renault
card.
1 ACCESS/SAFETY FUNCTION
1.1 SUB-FUNCTION: ACCESS
The Megane II allows:
–locking/unlocking by pressing the buttons on the Renault card (remote control function),
–locking/unlocking by pressing the central door locking button,
–locking via the Renault Anti-Intruder Device (RAID),
–automatic relocking.
If the vehicle is fitted with the hands-free function:
–hands-free unlocking of the entire vehicle, by cutting the optical beam on one of the door handles,
–hands-free boot-only unlocking by pressing the boot opening switch,
–hands-free locking (by pressing the handle closure switch or the switch located in the boot badge).
If the vehicle is fitted with:
–electric child safety locking,
–deadlocking,
–selective opening element unlocking,
–the valet card function.
1.1.1 procedure of locking/unlocking by pressing the buttons on the Renault card:
1Opening element locking motors
2Encrypted 433 MHz RF connection (315 Mhz in Japan)
3Card button pressed

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-9
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-9V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
a/ Main components of the function providing access through the pressing of a button on the Renault card:
–Renault card,
–UCH,
–opening element locking motors.
b/ Unlocking with the unlock button on the card:
The vehicle may be unlocked by pressing the unlock button on the Renault card (open padlock symbol), if the card
is less than 50 m from the vehicle (this distance varies according to the environment and the battery power). The RF
reception aerial is inside the UCH (except Scenic II fitted with the SSPP function).
Pressing the lock button on the Renault card starts the vehicle unlocking procedure. When the unlocking button is
pressed, the card sends a 433 MHz encrypted signal to the UCH (315 MHz in Japan). If the UCH authenticates the
Renault card, the UCH requests the locking motors to unlock.
Conditions required:
–The Renault card button must be pressed within the area covered by the card (this distance varies according to the
environment and the battery power).
–No + after ignition feed on the vehicle.
Statuses available for the unlocking function:
System operation may be viewed using statuses ET045 RF frame received, ET066 Card button press received
and ET067 Card button press recognised.
The power supply level on the vehicle can be viewed using ET014 Power supply level requested.
c/ Locking using the card's "lock" button:
The vehicle may be locked by pressing the lock button on the Renault card (closed padlock symbol), if the card is
less than 50 m from the vehicle (this distance varies according to the environment and the battery power). The RF
reception aerial is inside the UCH (except Scenic II fitted with the SSPP function).
Pressing the lock button on the Renault card starts the vehicle locking procedure. When the locking button is
pressed, the card sends a 433 MHz encrypted signal to the UCH (315 MHz in Japan). If the UCH authenticates the
Renault card, the UCH requests the locking motors to lock.
Conditions required:
–The Renault card button must be pressed within the area covered by the card (this distance varies according to the
environment and the battery power).
–No + after ignition feed on the vehicle.
–No doors open.
–No card in the card reader.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-10
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-10V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
Statuses available for the locking function:
System operation may be viewed using statuses ET045 RF frame received, ET066 Card button press received
and ET067 Card button press recognised.
The statuses of the doors detected by the UCH as open or closed are displayed using statuses ET053 Driver's door,
ET042 Passenger's door, ET051 Rear left-hand door, ET052 Rear right-hand door, ET050 Tailgate/boot and
ET041 Opening rear screen (if fitted to the vehicle).
The power supply level on the vehicle can be viewed using ET014 Power supply level requested.
d/ Boot-only locking/unlocking by pressing the "toggle boot status" button:
The boot alone may be locked/unlocked by pressing the "toggle boot status" button on the Renault card ("open
tailgate" symbol), if the card is less than 50 m from the vehicle (this distance varies according to the environment and
the battery power). The RF reception aerial is inside the UCH (except Scenic II fitted with the SSPP function).
Pressing the toggle boot status button on the Renault card starts the boot-only locking/unlocking procedure. When
the toggle boot status button is pressed, the card sends a 433 MHz encrypted signal to the UCH (315 MHz in Japan).
If the UCH authenticates the Renault card, it will authorise or inhibit opening of the boot depending on the previous
status (locked or unlocked).
Conditions required:
–The Renault card button must be pressed within the area covered by the card's radio frequency signal (this distance
varies according to the environment and the battery power).
–No + after ignition feed on the vehicle.
–No card in the card reader.
The statuses available for the boot-only unlocking/locking function (and for the opening rear screen if fitted)
are:
System operation may be viewed using statuses ET045 RF frame received, ET066 Card button press received
and ET067 Card button press recognised.
The open or closed status of the boot as seen by the UCH can be checked using status ET050 Tailgate/boot.
The status of the tailgate opening request is visible using status ET062 Tailgate opening request.
The open or closed status of the opening rear screen (if fitted) as seen by the UCH can be checked using status
ET041 Opening rear screen.
The status of the request to open the rear screen (if fitted) 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.
e/ Principle of the identifier code:
The Renault card is authenticated by the UCH by transmission of a "rolling code" for the access function. The code
transmitted automatically increases incrementally each time the card is pressed.
To allow for the case where the signal is not received by the UCH, a table of 1024 accepted codes has been created.
The UCH and the Renault card can become desynchronised if the limit of 1024 possible presses is exceeded, that is
the customer has pressed more than 1024 times outside the reception zone.
If the Renault card does become desynchronised (code transmitted by the Renault card is outside the acceptance
limit of the UCH), the user can access his vehicle using the emergency insert. Resynchronisation is performed when
the vehicle is started with the card in the card-reader, or by removing/replacing the card battery.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-11
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-11V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
f/ Display:
Unlocking is indicated by 1 flash of the direction indicators.
Locking is indicated by 2 flashes of the direction indicators.
When using the "boot status toggle" switch, display is not performed if a toggle request is made when the vehicle is
completely unlocked. In fact, in this case, the vehicle is not locked as only the boot is locked.
If one of the opening elements is detected as open when the request for locking the vehicle is made, the UCH will not
authorise vehicle locking and no indicators will flash to warn the user.
1.1.2 procedure of locking/unlocking by pressing the central door locking button:
This button is used to lock/unlock the vehicle while stationary or moving.
This button has no effect if the vehicle has been locked using the card in hands-free or manual mode.
Pressing the electric central door locking button when a door is unlocked will lock all the doors and the electric
central door locking indicator light will light up. Status ET044 CPE* button may be used to check that the button is
operating correctly.
The operation of the electric central door locking indicator light can be checked using command mode AC020 CPE*
button indicator light.
1.1.3 Principle of automatic locking when driving (RAID* system):
The Automatic Locking when Driving (RAID) function locks the vehicle as soon as the speed signal is above
approximately 4 mph (7 km/h).
Activation or deactivation of the RAID function can be viewed using ET043 RAID* function authorisation by CPE*.
The RAID function can be activated or deactivated by pressing and holding the electric door locking button for
approximately 5 seconds while the engine is running. Acknowledgement is indicated by a buzzer.
1.1.4 Principle of automatic relocking:
Automatic relocking takes place 2 minutes after hands-free or card unlocking if unlocking is not followed by the
opening of a door.
CPE*: Electric central door locking
RAID*: Renault Anti-Intruder Device Note:
Unlocking can be performed by the UCH if the airbag computer has detected an impact or if it is faulty (not
recognised on the multiplex network, internal fault, etc.). (see 88B, Multiplexing).

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-14
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-14V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
Conditions required:
–At least one vehicle card detected by the access aerials and not detected by the starting aerials.
–No doors open.
–No Renault card in the card reader.
–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 locking function:
The UCH receives the locking request in the form of an earth, when one of the locking buttons on the door handles
or in the centre of the boot badge is pressed.
The locking requests can be viewed using statuses ET058 Driver's side handle locking switch, ET059
Passenger's side handle locking switch and ET060 Tailgate locking switch. The statuses of the doors detected
by the UCH as open or closed are displayed using statuses ET053 Driver's door, ET042 Passenger's door, ET051
Rear left-hand door, ET052 Rear right-hand door, ET050 Tailgate/boot and ET041 Opening rear screen (if fitted
to the vehicle).
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.
e/ Display
Unlocking is indicated by 1 flash of the direction indicators.
Locking is indicated by 2 flashes of the direction indicators.Hands-free locking of the entire vehicle by stage:
1) The user presses one of the locking switches on the door handle or tailgate (located in the badge).
2) If the Renault card is not disabled for hands-free operation, the UCH sends a 125 kHz encrypted signal to
the access aerials (interrogation of the aerials on the side of the activated handle is performed first), and to
the starting aerials.
3) If the Renault card authenticates the code, it responds to the UCH using a 433 MHz encrypted signal.
4)If the UCH detects at least one Renault card in the access zone and this is authenticated (at least one Renault
card detected by the external aerials and not detected by the starting aerials; this is necessary to avoid the
vehicle being locked with the card inside), the UCH activates the locking motors.
5) If the UCH detects other cards inside the vehicle, it disables these cards for hands-free functions (access
and starting) until the next time the vehicle is unlocked.