2008 RENAULT SCENIC ESP

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-38
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-38V9 MR-372-J84-87B000$129.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
3 WIPER FUNCTION
3.1 Sub-function: WIPER CONTROL
The UCH receives the driver's request when the wiper stalk is used.
Windscreen wiper:
The UCH requests the Protection and Switching Unit via the CAN network to supply power to the windscreen wiper.
The park position is managed by the Protection and Switching Unit.
The wiper control stalk has four positions (neutral, intermittent wiping, slow speed and fast speed) and a wiper
intermittent speed ring which varies the time between each wipe.
Special notes:
If the windscreen wiper is set to low speed when the vehicle is moving and then the vehicle stops, the system switches
to intermittent wipe.
The requests made to the UCH by the wiper stalk can be displayed using statuses: ET077 Wiper stalk position and
ET096 Wiper intermittent speed ring.
If the vehicle is fitted with a rain sensor, (see special features of the rain and light sensor).
Rear screen wiper:
Rear wiper speed and power supply are also controlled by the UCH.
Windscreen wiper outside neutral position:
–The rear screen wiper starts to operate as soon as reverse gear is engaged and rain drops are detected on the
windscreen wiper.
–When the vehicle is stationary, the wipers operate intermittently every 7 seconds; over 36 mph (60 km/h) they
operate every 3 seconds. There is no continuous wiping function, except during the rear screen washer control.
The statuses corresponding to operation of the rear screen wiper can be displayed using statuses ET080 Rear
screen wiper request, ET097 Rear screen wiper park position and ET109 Reverse gear engaged or ET108
Automatic gearbox lever position, by configuration reading LC064 Rear screen wiper and by configuration
CF166 Rear screen wiper.
Windscreen washers:
The front and rear windscreen washers are controlled directly by the wiper control stalk, via a wire connection.
These connections are doubled up to the UCH to permit command status reading.
ET078 Windscreen washer request,
ET079 Rear screen washer request.
Special features of headlight washers
For vehicles fitted with xenon bulbs, the headlight washers are actuated at the same time as the windscreen washer,
only if the headlights are on.
Two cases are possible concerning the control of the headlight washers.
First case: (vehicles fitted with a SIEMENS Vdiag 44 UPC): the UCH sends the command by cable to two headlight
washer relays on a relay plate underneath the UPC.
Second case: (vehicles fitted with a LEAR Vdiag 48 or later): the UCH requests the UPC via the multiplex network to
activate the washer relays.
WARNING
If the UCH does not manage to 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 windscreen wiper at low speed
(defect mode).
MR-372-J84-87B000$129.mif

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-47
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-47V9 MR-372-J84-87B000$129.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
SYSTEM OPERATION
–The valves are activated approximately 1 minute after the vehicle has been running at a speed above 12 mph
(20 km/h).
–During driving, the valves emit signals every minute.
–The valves remain active for 15 minutes after the vehicle stops, then switch to standby mode.
–In standby mode, the valves emit signals only if they detect a pressure difference between two successive
measurements exceeding 68 mbar or if the pressure difference since last emitting exceeds 68 mbar (due to tyre
cooling).
–The tyres are considered to be cold when the vehicle speed has been zero for 1h 45 min.
–The minimum time for detection of a leak is approximately 15 minutes.
–The message Inflate tyres for motorway is displayed only if the vehicle travels at more than 102 mph (170 km/
h) (as an indication) for 3 minutes and the pressure on at least one of the tyres is 400 mbar less than the
recommended pressure at low speed. This message is inactive if the tyres are inflated to motorway pressure,
irrespective of the vehicle speed.
–Alert thresholds:
–over-inflation when cold = recommended pressure + 700 mbar,
–over-inflation when hot = recommended pressure + 850 mbar,
–under-inflation = recommended pressure - 400 mbar,
–serious under-inflation = recommended pressure - 600 mbar,
–imbalance = difference in pressure between the left-hand and right-hand wheels on the same axle greater
than 500 mbar.
–Information messages for the driver:
–Stop! Tyre puncture + STOP warning light + wheel concerned is highlighted on instrument panel display +
buzzer.
–Adjust tyre pressure + the wheel concerned is highlighted on instrument panel display.
–Inflate tyres for motorway + four wheels highlighted on instrument panel display.
–Tyre sensor fault + the wheel concerned is erased.
–Electronic fault + "Service" warning light + the four wheels concerned disappear from the instrument panel
display.
–No display of the tyre inflation pressure on the instrument panel on MEGANE II.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Configurations and programming
87B
87B-65
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Configurations and programming
87B
87B-65V9 MR-372-J84-87B000$215.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
9) CONFIGURATION PROCEDURE FOR THE TYRE PRESSURE MONITOR FUNCTION (CF023)
10) INSTRUMENT PANEL CONFIGURATION PROCEDURE (CF145)CF023:
TYRE PRESSURE MONITOR FUNCTION
(in programming command SC008 "UCH type")
WRITING THE CONFIGURATION WITH
OR WITHOUT TYRE PRESSURE MONITOR:
●Select the Repair mode menu.
●Select the Programming menu.
●Select line SC008 then line CF023, then With or Without.
●Confirm the selection.
●Check that sure the configuration has been properly stored by checking the Read configuration menu at line
LC017 Tyre pressure monitor function.
IMPORTANT:
CONFIGURATION INCONSISTENCY BETWEEN THE INSTRUMENT PANEL AND UCH
1st case–The instrument panel detects that the tyre pressure monitor is programmed in the UCH but
not its proper configuration. The message ELECTRONIC FAULT appears, then the
4 wheels disappear on the instrument panel display, and the Service warning light comes
on.
2nd case–The instrument panel detects that the tyre pressure monitor is programmed in its own
configuration but the UCH fails to respond to any requests from the instrument panel (not
configured in UCH). The message TYRE SENSOR FAULT will appear, the four wheels
will disappear from the instrument panel display and the Service warning light will come
on.
CF145:
TYRE PRESSURE MONITOR
●After the multiplex network test, select Instrument panel.
●Select Repair mode.
●Select Write configuration.
●Select line CF145, then With or Without.
●Confirm the selection.
●Check that the configuration has been properly stored in the Read configuration menu at line LC056 Tyre
pressure monitor.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
87B
87B-72
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
87B
87B-72V9 MR-372-J84-87B000$301.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
DF002
PRESENT
STEERING LOCK
1.DEF: Steering lock internal electronic fault
2.DEF: Steering column lock internal electronic fault
3.DEF: Mechanical fault on column
4.DEF: Steering column lock authentication fault
5.DEF: Steering column lock authentication fault
6.DEF: UCH internal electronic fault
7.DEF: Steering column lock internal electronic fault
8.DEF: Steering column lock internal electronic fault
NOTESPriorities when dealing with a number of faults:
Firstly, deal with fault DF029 Steering column lock circuit, if it is present.
Special notes:
Attempt to apply forced + after ignition feed to update the faults.
1.DEF
NOTESAttempt to apply forced + after ignition feed to update the
faults.
If the fault is still present, replace the steering column lock.
2.DEF
NOTESAttempt to apply forced + after ignition feed to update the
faults.
Make another attempt to lock/unlock the column.
If the fault is still present, replace the steering column lock.
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.
UCH_V44_DF002P/UCH_V48_DF002P/UCH_V4C_DF002P/
UCH_V4D_DF002P/UCH_V4F_DF002P /UCH_V50_DF002P

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
87B
87B-74
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
87B
87B-74V9 MR-372-J84-87B000$301.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
DF002
CONTINUED 2
6.DEF
NOTESAttempt to apply forced + after ignition feed to update the
faults.
Make another attempt to lock/unlock the column.
If the fault is still present, replace the UCH.
7.DEF
NOTESAttempt to apply forced + after ignition feed to update the
faults.
If the vehicle is fitted with a Vdiag 0F ABS computer, or a Vdiag 0B or Vdiag 11 ABS/ESP computer: establish
dialogue with the ABS or ABS/ESP computer and verify that PR020 Vehicle speed on initialisation is correctly
configured. If the configuration is incorrect, use command VP032 Vehicle speed on initialisation to reconfigure
the ABS or the ABS/ESP.
Make five attempts to start and lock the column.
If the fault is still present, replace the steering column lock.
8.DEF
NOTESAttempt to apply forced + after ignition feed to update the
faults.
Deal with DF029 Steering column lock circuit first.
If the fault is still present, replace the steering column lock.
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
87B
87B-78
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
87B
87B-78V9 MR-372-J84-87B000$301.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
DF006
DF007
DF008
DF009
PRESENTFRONT LEFT-HAND WHEEL VALVE SENSOR
FRONT RIGHT-HAND WHEEL VALVE SENSOR
REAR RIGHT-HAND WHEEL VALVE SENSOR
REAR LEFT-HAND WHEEL VALVE SENSOR
2.DEF: Sensor internal electronic fault
3.DEF: Sensor internal electronic fault
4.DEF: Sensor internal electronic fault
5.DEF: Sensor internal electronic fault
6.DEF: Sensor internal electronic fault
7.DEF: Sensor internal electronic fault
8.DEF: Sensor internal electronic fault
1.DEF: No sensor signal.
NOTESSpecial notes:
Any operation involving the replacement of a valve, or the removal of a tyre requires
perfect knowledge of the precautions (see MR 364 (Mégane II) or MR 370 (Scénic II),
Mechanical, 35A, Wheels and tyres).
Before any operation, ensure that all the wheels have tyre pressure monitoring valves,
and that the spare wheel has not been fitted.
For faults DF006 to DF009, if the fault is present during the first few kilometres, reprogram the 4 valves.
In the event of a programming failure, replace the valve concerned (see MR 364 (Mégane II) or MR 370
(Scénic II), Mechanical, 35B, Tyre pressure monitor system)
Check that there are no wheels with rubber valves. If there are, replace them with wheels with a valve fitted with
a sensor and carry out a road test.
If the fault is still present, program the 4 valves.
If the fault is still present, replace the valve (see MR 364 (Mégane II) or MR 370 (Scénic II), Mechanical, 35B,
Tyre pressure monitor system).
The correspondence between fault numbers and the valve concerned is described below:
–DF006 Front left-hand wheel valve sensor,
–DF007 Front right-hand wheel valve sensor,
–DF008 Rear right-hand wheel valve sensor,
–DF009 Rear left-hand wheel valve sensor.
Once the sensor has been replaced, program the four valve codes according to procedure SC002 Programming
the four valve codes (see Configurations and programming).
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.
UCH_V44_DF006P/UCH_V44_DF007P/UCH_V44_DF008P/UCH_V44_DF009P/UCH_V48_DF006P/UCH_V48_DF007P/UCH_V48_DF008P/
UCH_V48_DF009P/UCH_V4C_DF006P/UCH_V4C_DF007P/UCH_V4C_DF008P/UCH_V4C_DF009P/UCH_V4D_DF006P/
UCH_V4D_DF007P/UCH_V4D_DF008P/UCH_V4D_DF009P/UCH_V4F_DF006P/UCH_V4F_DF007P/UCH_V4F_DF008P/
UCH_V4F_DF009P/UCH_V50_DF006P/UCH_V50_DF007P/UCH_V50_DF008P/UCH_V50_DF009P

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
87B
87B-114
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
87B
87B-114V9 MR-372-J84-87B000$344.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
DF147
PRESENT
STEERING COLUMN LOCK SAFETY CIRCUIT
NOTESPriorities when dealing with a number of faults:
Deal with fault DF029 Steering column lock circuit first if it is present.
Special note:
Attempt to apply forced + after ignition feed to update the faults.
Use Wiring Diagrams Technical Note for MEGANE II or SCENIC II.
Check the condition and connection of the steering column lock connector.
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 UCH PE1 and PP2 connectors.
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 26J.
Between components 645 and 1088.
If the connection(s) is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
wiring: precautions for repair), repair the wiring, otherwise replace it.
Check the continuity and insulation of the following connection:
●Connection code NAM between component 1088 and earth.
If the connection is faulty and there is a repair method (see Technical Note 6015A, Repairing electrical wiring,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
If the fault is still present, replace the UCH.
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.
UCH_V44_DF147P/UCH_V48_DF147 P/UCH_V4C_DF147P/
UCH_V4D_DF147P/UCH_V4F_DF147P/UCH_V50_DF147P