ignition RENAULT SCENIC 2008 J84 / 2.G Passenger Comparment Connection Unit Workshop Manual

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Introduction87B
87B-2
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Introduction87B
87B-2V9 MR-372-J84-87B000$043.mif
187B
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Introduction
1. SCOPE OF THIS DOCUMENT
This document presents the fault finding procedure applicable to all computers with the following specifications:
2. PREREQUISITES FOR FAULT FINDING
Documentation type:
Fault finding procedures (this document):
–Assisted fault finding (integrated into the diagnostic tool), Dialogys.
Wiring Diagrams:
–Visu-Schéma (CD-ROM), paper.
Type of diagnostic tools:
–CLIP
Special tooling required:
3. REMINDERS
Procedure
To run fault finding on the vehicle computers, switch on the forced + after ignition feed.
Proceed as follows: Vehicle(s): Mégane II, Scénic II
Function concerned: UCHName of computer: UCH
Vdiag No.: 44, 48, 4C, 4D, 4F, 50.
Special tooling required
Multimeter
Elé. 1681 Universal bornier
Switch on the forced + after ignition feed:
–with the vehicle card in the card reader,
–press and hold start button (longer than 5 seconds) with start-up conditions not fulfilled,
–connect the diagnostic tool and perform the required operations.
Switching off the forced + after ignition feed:
Press the Start button twice briefly (less than 3 seconds).
ensure that the + after ignition feed has been cut off by checking that the computer indicator lights on the instrument
panel have gone out.
UCH_V44_PRELI /UCH_V48_PRELI/UCH_V4C_PRELI/
UCH_V4D_PRELI/UCH_V4F_PRELI/UCH_V50_PRELI
MR-372-J84-87B000$043.mif

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Introduction87B
87B-3
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Introduction87B
87B-3V9 MR-372-J84-87B000$043.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
Faults
Faults are declared present or stored (depending on whether they appeared in a certain context and have
disappeared since, or whether they remain present but are not diagnosed within the current context).
The present or stored status of faults should be taken into consideration when the diagnostic tool is used after the
forced + after ignition feed is switched on (without acting on the system components).
For a present fault, apply the procedure described in the Interpretation of faults section.
For a stored fault, note the faults displayed and apply the instructions in the Notes section.
If the fault is confirmed when the instructions in the Notes section are applied, the fault is present. Deal with the
fault.
If the fault is not confirmed, check:
–The electric lines on which there is a fault;
–The connectors on those lines (corrosion, bent pins, etc.);
–The resistance of the faulty component;
–The condition of the wires (insulation melted or split, chafing, etc.).
Conformity check
The aim of the conformity check is to check data that does not produce a fault on the diagnostic tool because the
data is inconsistent. Therefore, this stage is used to:
–carry out fault finding on faults that do not have a fault display, and which may correspond to a customer complaint.
–check that the system is operating correctly and that there is no risk of a fault recurring after repairs.
This section gives the fault finding procedures for statuses and parameters and the conditions for checking them.
If a status is not behaving normally or a parameter is outside the permitted tolerance values, consult the
corresponding fault finding page.
Customer complaints - Fault finding chart
If the test with the diagnostic tool is OK but the customer complaint is still present, the fault should be processed by
customer complaints.
A summary of the overall procedure to follow is provided on the following page in
the form of a flow chart.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Introduction87B
87B-6
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Introduction87B
87B-6V9 MR-372-J84-87B000$043.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
5. FAULT FINDING LOG
You will always be asked for this log:
–when requesting technical assistance from Techline,
–for approval requests when replacing parts for which approval is mandatory,
–to be attached to monitored parts for which reimbursement is requested. The log is needed for warranty
reimbursement, and enables better analysis of the parts removed.
6. SAFETY INSTRUCTIONS
Safety rules must be observed during any work on a component to prevent any damage or injury:
–check the battery voltage to avoid incorrect operation of computer functions,
–use the proper tools.
Procedure for disconnecting the battery:
–Switch off the ignition.
–Switch off all the electrical consumers. Wait at least 1 minute for the electronic systems to switch off.
Disconnect the battery, starting with the negative terminal.IMPORTANTIMPORTANT
Any fault on a complex system requires thorough fault finding with the appropriate tools. The
FAULT FINDING LOG, which should be completed during the procedure, enables you to keep
track of the procedure which is carried out. It is an essential document when consulting the
manufacturer.
IT IS THEREFORE ESSENTIAL THAT THE FAULT FINDING LOG IS FILLED OUT EVERY TIME IT IS
REQUESTED BY TECHLINE OR THE WARRANTY RETURNS DEPARTMENT.

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-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.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
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87B-22
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-22V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
1.1.13 Principle of automatic window relift:
When the doors are locked, and the lock button on the card is pressed twice in succession (or the door or boot if
the vehicle is fitted with hands-free function), the windows close automatically (as well as the sunroof, if fitted to
the vehicle).
The function is available on certain vehicles (see table below) depending on the number of one touch windows on
the vehicle and depending on the bodywork phases.
The automatic window relift function cannot be configured separately; it is automatically configured during special
command SC008 UCH type according to the vehicle type, number of one-touch windows and the production number
type.
1.1.14 Principle of new vehicle storage mode:
The vehicle is configured in this mode when it leaves the factory to optimise its power consumption:
–The immobiliser warning light is inhibited.
–The direction indicator warning lights are lit continuously on the instrument panel.
Before delivering the vehicle to the customer, deactivate this mode:
–By flipping down the steering column controls with the after ignition feed off.
–Or using command VP016 Deactivate new vehicle storage mode.
This function can only be activated in the factory with UCH Vdiag 4F or 50.If Then
Vehicle type One-touch window(s)Production
number typeFunction of automatic
window relift:
All except cabriolet phase 1 and 2
bodyworkWITHOUT WITHOUT
4-door phase 1 bodywork 1 driver OTW Jxxxxxx WITHOUT
4-door phase 1 bodywork 1 driver OTW OTHERS WITH
All except cabriolet and 4-door phase
1 bodywork1 driver OTW WITH
All except cabriolet phase 2 bodywork 1 driver OTW WITHOUT
All except cabriolet phase 1 and 2
bodywork2 or 4 OTW WITH
Cabriolet phase 1 and 2 bodywork WITHOUT WITHOUT

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-23
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-23V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
1.2 SUB-FUNCTION: PROTECTION
1Steering column lock
2Injection computer
3Card reader
4Start button
5Starter aerials
6Renault Card
7Multiplex network
8Wire connection
The UCH shares control of the vehicle's immobiliser protection system with other computers.
De-protection of the vehicle is performed in three consecutive stages:
–a) Authentication of the card (hands-free or card reader).
–Unlocking of the steering column lock (to allow after ignition feed to be established).
–Unlocking the injection computer.
1.2.1 Authentication of the Renault card:
Authentication is performed differently depending on whether the vehicle is fitted with the hands-free option or not.
a) Authentication of the Renault card when the vehicle is fitted with the hands-free option:
When the user presses the start button, the UCH activates its starting aerials and authenticates a card in the
following way:
1/ The UCH activates its three starting aerials which generate a 125 kHz radio frequency signal. This signal is sent
to the Renault card.
2/ If the Renault card is located in the zone covered by the starting aerials and recognises its UCH, it responds
directly to the UCH with a 433 MHz signal giving its identifier.

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.