2008 RENAULT SCENIC battery

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-24
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-24V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
3) The UCH decrypts the response and compares it with that stored in its memory. If the result is correct, it continues
the starting procedure. The aerials stop transmitting once the card is authenticated.
If no Renault card responds in hands-free mode, the UCH interrogates the card reader. If the Renault card is in the
card reader, authentication is via transponder.
The card reader must be used to start in hands-free mode in the following situations:
–flat card battery,
–vehicle in an area of frequency interference,
–boot open (indication on instrument panel).
The statuses and commands available on the card authentication function:
–ET035 Radio frequency signal received.
–ET070 Start button.
–ET046 Immobiliser.
–ET014 Power supply level requested.
–AC036 Internal aerial testing.
b) Authentication of the Renault card when the vehicle is not fitted with the hands-free option:
When the user presses the start button, the UCH authenticates the card in the card reader using the transponder
mode (short-range data exchange at 125 KHz). The transponder mode does not require a battery in the card.
1Wire connection
2Card reader
3Short range TRANSPONDER connection
4Renault Card
The statuses and commands available on the card authentication function:
–ET070 Start button
–ET046 Immobiliser
–ET014 Power supply level requested

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-27
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-27V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
1.2.4 Renault card check by the UCH:
a/ Card check:
When the engine is running, the UCH checks for the presence of the Renault card in the passenger compartment (if
vehicle is hands-free) or in the card-reader when a door is opened then closed. If the Renault card is not detected, a
message on the instrument panel and a buzzer warn the driver.
Command AC036 Internal aerial test is used to check the area covered by the starting aerials inside the passenger
compartment (hands-free vehicles). The card reader flashes when the card is detected.
This command allows a hands-free card to be recognised even if it does not belong to the vehicle.
b/ Low battery warning:
If the Renault card battery is faulty or flat, the change card battery message is displayed on the instrument panel
when the vehicle is started, if there have been 5 attempts to authenticate the Renault card since the battery fault.
c/ Storing information on the card:
A device allowing information relating to the vehicle to be read from the card is available.
Information available: – VIN (Vehicle Identification Number).
–Mileage.
–Fuel level.
–Mileage before oil change.
–Tyre pressure (if vehicle fitted with SSPP).
–Status of OBD warning light.
–Oil level.
2.5 Immobiliser warning light programs
Immobiliser warning light Vehicle protection status
Ignition
offWarning light flashes slowlyVehicle protected (immobiliser active or fault with
steering lock)
Warning light not lit New vehicle or blank UCH storage mode
Ignition
onWarning light flashes slowly Renault card not recognised
Warning light continuously lit Injection authentication fault
Warning light not lit Vehicle unprotected (immobiliser inactive)

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.