2008 RENAULT SCENIC check engine

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-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-36
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-36V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
1.4.3.7 Automatic gearbox computer (if fitted):
The computer informs the UCH of the selector position (park, neutral, etc.) via the multiplex network.
2 AIR CONDITIONING FUNCTION
The type of air conditioning control can be displayed by configuration reading LC013 Air conditioning type and
configured using command CF019 Air conditioning type (can be configured during configuration of the UCH
by the SC008 UCH type command).
2.1 Sub-function: USER SELECTION (Non-regulated air conditioning only)
The UCH receives the signal from the air conditioning panel via cable connection for the air conditioning request, for
electric heated rear screen and the signal for passenger compartment blower operation.
The UCH sends the request to the Protection and Switching Unit to start electric heated rear screen de-icing.
The UCH sends the request to the injection system to activate the air conditioning compressor.
The following statuses can be displayed:
–ET029 Air conditioning button.
–ET028 Heated rear screen button.
–ET015 Passenger compartment fan.
Operation of the indicator lights on the air conditioning and electric heated rear screen request buttons can be
checked using the following actuator commands:
AC015 Air conditioning button indicator and AC019 Heated rear screen indicator.
2.2 Sub-function: HEATING
The UCH manages the passenger compartment heating resistors (RCHs) by controlling power relays according to
the request for ventilation in the passenger compartment, the engine coolant temperature, the external temperature,
the electrical power balance, engine loading and, for the cabriolet version, if the roof is open.
The following statuses and parameters produced by the UCH can be displayed:
–PR001 Battery voltage.
–PR002 External temperature.
–ET015 Passenger compartment blower only with non-regulated air conditioning.
–ET017 Number of RCH*s required.
–ET018 Number of RCH*s authorised by alternator alternator charge rate.
–ET019 Number of RCH*s authorised by injection system.
–ET020 Number of RCH*s activated.
–ET021 RCH* 1 control.
–ET022 RCH* 2 control.
–ET031 Fast idle request for RCH.
–ET169 Engine.
–ET025 Retractable roof for cabriolet version only.
–ET026 Heated rear screen switch.
*RCH = Passenger Compartment Heating Resistors

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-37
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-37V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
Relay 1 controls a passenger compartment heating resistor unit consisting of one resistor.
Relay 2 controls a passenger compartment heating resistor unit consisting of two resistors.
Check the operation of the passenger compartment heating resistors using actuator commands:
AC016 RCH relay 1, AC017 RCH relay 2 and AC018 RCH relay 3.
The configuration can be displayed using LC030 Heating resistor types.
2.3 Sub-function: COLD LOOP
The UCH requests the injection to switch on the compressor via the multiplex network, depending on the external
temperature, the passenger compartment blower activation signal and whether the engine is in operation. The
following statuses and parameters can be displayed:
–ET030 Air conditioning request 2.
–ET169 Engine.
–ET015 Passenger compartment fan.
–PR002 External temperature.Passenger compartment
heating resistor powerRelay 1 Relay 2
0 W 0 0
333 W 1 0
667 W 0 1
1000 W 1 1

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Configurations and programming
87B
87B-63
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Configurations and programming
87B
87B-63V9 MR-372-J84-87B000$215.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
8.2 Vdiag 4C and 4D:
This procedure will enable the UCH to be configured in relation to the vehicle to provide optimum running.
–Click on the Repair mode and in the Programming menu,
–confirm line SC008 UCH type,
–follow the procedure and enter the following data:
CF097 Vehicle type (3-door/4-door/5-door/cabriolet/extended MPV/MPV/Estate).
CF011 Gearbox type (BVA or BVM).
CF020 Type of driving style (Right-hand or Left-hand).
CF028 Engine type (F or K)
–confirm, follow the procedure and enter the following data:
CF010 Hands-free function (WITH or WITHOUT),
CF023 Tyre pressure monitoring system (WITH or WITHOUT),
CF057 Type of heating resistors (NONE, 1000 W, or 1800 W),
CF019 Type of air conditioning (HEATING, AUTOMATIC, MANUAL),
CF027 Type of windscreen (TINTED, HEAT INSULATING),
CF087 Front fog light (WITH or WITHOUT),
CF014 Daytime running lights (WITH or WITHOUT),
CF012 Rain sensor (WITH or WITHOUT),
CF029 External temperature sensor (WITH or WITHOUT).
–confirm, follow the procedure and enter the following data:
CF036 Selective opening of opening elements (WITH or WITHOUT): Only if CF010 = WITHOUT.
CF016 PAX system type tyre (WITH or WITHOUT): Only if CF097 = MPV or extended MPV or cabriolet and if
CF023 = WITH.
CF100 Deadlocking (WITH or WITHOUT).
CF013 Light sensor (WITH or WITHOUT): Only if CF014 = WITHOUT.
CF022 Factory fitted
perimeter protection (WITH or WITHOUT). Function only available on vehicles sold in
Mexico. CF083 One touch window(s) (WITH or WITHOUT): Absent if CF097 = Cabriolet.
–confirm, follow the procedure and enter the following data:
CF085 Valet card function (WITH or WITHOUT) Function only available in Mexico. Only if CF036 = WITH and
CF023 = WITHOUT.
–check that the options configured are those desired and finish.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
87B
87B-84
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
87B
87B-84V9 MR-372-J84-87B000$301.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
DF014
PRESENT
OR
STOREDCARD READER CIRCUIT
CC.0: Short circuit to earth
CO.0: Open circuit or short circuit to earth
CC.1: Short circuit to + 12 V
1.DEF: Internal electronic fault
NOTESConditions for applying the fault finding procedure to a stored fault:
Insert the card into the card reader, switch on and switch off the engine leaving the
card in the card reader. Carry out fault finding on the card reader circuit with the card
in the card reader (after the engine is switched off, the card reader is supplied and
controlled for 20 min).
Use Wiring Diagrams Technical Note for MEGANE II or SCENIC II.
CC.0
NOTESNone.
Check the condition and connection of the card reader connector (tabs bent, broken, oxidised, etc.).
If the connector is faulty and if there is a repair procedure (see Technical Note 6015A, Repairing electrical
wiring, Wiring: Precautions for repair), repair the connector; otherwise, replace the wiring.
Check the condition and connection of the PE2 and PE1 connectors of the UCH (tabs bent, broken, oxidised,
etc.).
If the connector is faulty and if there is a repair procedure (see Technical Note 6015A, Repairing electrical
wiring, Wiring: Precautions for repair), repair the connector; otherwise, replace the wiring.
Ensure the continuity and insulation from earth of the following connections:
●Connection code 26BG,
●Connection code 26BD,
●Connection code 26BH.
Between components 645 and 1082.
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Using the oscilloscope, check for a square pulse signal on connection 26BH of the card reader connector:
Connect the oscilloscope between connection 26BH of the connector and a bodywork earth.
Set the oscilloscope as: Calibration at 5 V/division
Time base 100 ms/division
Check for a square pulse signal from the UCH on connection 26BH of the card reader connector.
If there is no signal, replace the UCH.
If there is a signal, replace the card reader.
If the fault is still present, contact the Techline.
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.
UCH_V44_DF014 /UCH_V48_DF014/UCH_V4C_DF014/
UCH_V4D_DF014/UCH_V4F_DF014/UCH_V50_DF014

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check
87B
87B-117
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check
87B
87B-117V9 MR-372-J84-87B000$387.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check
MAIN COMPUTER STATUSES AND PARAMETERS
SR.*: sunroof.Note:
Certain statuses and parameter do not affect all the Vdiags.
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(fault reading and configuration checks).
Application condition: engine stopped, + after ignition feed present.
Sub-functionParameter or
Status
checked Action Display and Notes Fault finding
UCHPR001:Battery voltage9 V < X < 16 VIn the event of a fault,
consult the interpretation
of parameter PR001.
ET014:Control power
levelNONE
ACCESSORIES FEED
TIMED
APCNone
ET087:One-touch
window control/
SR.*
authorisationACTIVE
INACTIVEIn the event of a fault, refer
to the interpretation of
status ET087.
ET098:ADAC* buttonDEPRESSED
RELEASEDIn the event of a fault,
consult the interpretation
of status ET098.
ET195:UCH frequency
(IN MHz)315
433None
ET205:Type of UCH RF
aerialINTERNAL
EXTERNALNone
ET010:Card frequency
(in MHz)315
433None
UCH_V44_CCONF/UCH_V48_CCONF/UCH_V4C_CCONF/
UCH_V4D_CCONF/ UCH_V4F_CCONF/UCH_V50_CCONF
MR-372-J84-87B000$387.mif