2008 RENAULT SCENIC power steering

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
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-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-26
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-26V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
b/ Locking the steering column:
The steering column is locked with the engine off, after the Renault card is removed from the card reader. This
locking operation requires:
–a valid 0 mph (0 km/h) speed signal,
–a correctly functioning airbag and no impact detected,
–a deactivated + after ignition connection.
When the engine has not been started but the after ignition feed is active (e.g. forced after ignition feed), certain
conditions in which there is a drop in the after ignition feed do not cause the steering column to lock ("steering
column not locked" message).
Steering column lock fails if:
1/ Normal non-locking scenarios:
–the card is present in the card reader,
–more than 20 minutes has elapsed with the card in the reader and the engine off,
–the vehicle speed is not zero,
–power is demanded by the steering column lock too frequently.
With regard to vehicles fitted with UCH computer Vdiag 4F or above:
–the Renault card is removed from the card reader when the vehicle is in forced + after ignition feed,
–3 minutes have elapsed following a starting failure due to an engaged gear,
–the Renault card is removed from the card reader following a starting failure due to an engaged gear,
–a front door is open following a starting failure due to an engaged gear and the card is not in the reader.
To lock the steering column, start and stop the engine again.
2/ Abnormal non-locking scenarios:
–the airbag unit is faulty or locked,
–the airbag unit is disconnected,
–the airbag has been triggered,
–the speed signal is not available.
In the event that a steering column does not lock, the driver is informed via the message Steering column not locked.
1.2.3 Locking the injection computer:
When the + after ignition feed has been established, the UCH and the injection computer compare their codes via
the multiplex network. If the codes are identical, the vehicle immobiliser is deactivated (ET046 Immobiliser).
If there is a failure, the immobiliser remains active.
Reactivating protection: the immobiliser is reactivated when the engine stops.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-33
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-33V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
1.4.1.6 The door locking motors:
These are direct current motors (12 V supply). The door locking motors are controlled by the UCH.
The deadlocking function requires a second motor per door.
1.4.2 Main components of the PROTECTION sub-function:
The protection sub-function is based on 4 main coded components:
–The Renault cards.
–The UCH.
–The electric steering column lock.
–The injection computer.
These parts are coded definitively: a part coded for one vehicle may not be used on another vehicle.
It is possible to replace a coded part with an uncoded part using special procedures in the CLIP tool and the vehicle
repair code (See Configuration and programming).
1.4.2.1 The Renault card:
The Renault card enables the vehicle to be started in two modes:
–starting by inserting the card into the reader:
–hands-free starting without insertion of the card into the card reader (hands-free vehicles).
The Renault card is powered by a 3 V battery. This battery is necessary to operate in standard and hands-free mode.
If the battery is too old, or if the vehicle is in an area of frequency interference, hands-free starting is not possible, but
always possible by inserting the Renault card into the reader.
1.4.2.2 The UCH:
a) The UCH detects the starting request (Start button pressed under starting conditions).
b) The UCH authenticates the Renault card via the starting aerials for hands-free mode, or via the card reader for
transponder mode.
c) The UCH manages the exchange with the steering column lock:
The UCH sends an unlocking request to the steering column via the vehicle's multiplex network, and the steering
column responds with the status of the lock bolt.
d) The UCH requests activation of the + after ignition feed from the Protection and Switching Unit.
e) The UCH manages the exchange with the injection computer:
The UCH and the injection computer exchange their codes via the vehicle's multiplex network to deactivate protection
and unlock the immobiliser.
f) The UCH requests the Protection and Switching Unit to supply the starter motor.

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-39
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-39V9 MR-372-J84-87B000$129.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
3.2 Sub-function: WIPER POWER
The UCH controls the rear screen wiper's power (and that of the headlight washers if the vehicle is fitted with xenon
headlights and a SIEMENS Vdiag 44 UPC).
Their operation can be checked using commands AC007 Rear screen wiper, AC030 Headlight washer relay 1
and AC031 Headlight washer relay 2.
Rain and light sensor
Information displays Multiplex network
Steering column
control
UCH Protection and
Switching Unit
Rear screen wiper Rear screen wiper
Windscreen and rear
screen washers
Headlight
washers

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-43
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-43V9 MR-372-J84-87B000$129.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
4FUNCTION: LIGHTING
4.1 Sub-function: LIGHTING CONTROL
The UCH receives the request from the driver, from the lighting stalk, from the hazard warning lights button and, if
fitted to the vehicle, from the light detector.
The UCH requests the Protection and Switching Unit, via the multiplex network, to provide power to the side lights,
dipped headlights, main beam headlights and fog lights (front).
If a request to activate the lighting is made, the UPC provides power to the xenon bulb computers.
The dipped headlights are still supplied when the main beam headlights are activated.
The following statuses can be displayed:
ET081 Lighting stalk position.
ET082 Rear fog lights request.
ET085 Hazard warning lights switch.
ET083 Left-hand direction indicator request.
ET084 Right-hand indicator request.
If the UCH cannot determine the position of the control stalk, or inform the Protection and Switching Unit of the
control stalk's position, the Protection and Switching Unit will activate the dipped headlights.
4.2 Sub-function: LIGHTING POWER
The UCH controls the power supply for the rear fog light (a single one), direction indicators and interior lighting (roof
lights and footwell/floor lights).
The interior lighting request can be displayed using the ET112 Interior lighting control status.
Operation of the lights powered by the UCH can be checked using the actuator commands AC009 Rear fog lights,
AC022 Left-hand direction indicator, AC023 Right-hand direction indicator, AC021 Interior lights and AC027
Footwell/floor lighting.
Information displays Rain and light sensor Multiplex network
Steering column
controlUCHProtection and Switching
Unit
Rear fog light
Direction indicators
Interior lighting
Side lightsMain beam
headlights
Dipped
headlightsFront fog lights

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
87B
87B -100
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
87B
87B -100V9 MR-372-J84-87B000$344.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
DF029
PRESENT
STEERING LOCK CIRCUIT
CC.1: Short circuit to + 12 V
1.DEF: Open circuit (e.g. lock disconnected) or lock power supply absent
2.DEF: Lock earth absent or multiplex network faulty (e.g. steering lock ΑΕ UCH
connection)
4.DEF: Short circuit to earth on the steering column lock sensor connection
5.DEF: Open circuit on the steering column lock sensor connection
6.DEF: Short circuit to + 12 V on the steering column lock sensor connection
NOTESSpecial note:
Attempt to apply forced + after ignition feed to update the faults.
Use Wiring Diagrams Technical Note for MEGANE II or SCENIC II.
CC.1
NOTESAttempt to apply forced + after ignition feed to update the
faults.
Check the condition and connection of the steering column lock connector.
If the connector is faulty and if there is a repair method (see Technical Note 6015A, Repairing electrical wiring,
Wiring: Precautions for repair), repair the connector; otherwise, replace the wiring.
Check the condition and connection of connectors PE2, PP2 on the UCH and connectors PEH (UPC Vdiag 44)
or CT1 (UPC Vdiag 48) on the UPC (bent or broken tabs, etc.).
If the connector(s) 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 insulation and continuity of the following connections:
●Connection code 26I,
●Connection code 26AZ,
●Connection code 26BA, between the steering column lock (component code 1088) and the UCH
(component code 645)
●Connection code AP15, between the steering column lock (component code 1088) and the Protection and
Switching Unit (component code 1337)
If the connection(s) is faulty and if there is a repair procedure (see Technical Note 6015A, Electrical wiring
repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
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_DF029P/UCH_V48_DF029P/UCH_V4C_DF029P/
UCH_V4D_DF029P/UCH_V4F_DF029P/UCH_V50_DF029P
MR-372-J84-87B000$344.mif