2008 RENAULT SCENIC stop start

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-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-35
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-35V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
1.4.3 Main components of the STARTING sub-function:
The starting sub-function is based on the following main factors:
–The starting conditions being present.
–Passenger Compartment Control Unit (UCH).
–The automatic gearbox computer (if fitted on the vehicle).
–The Protection and Switching Unit.
1.4.3.1 Start button:
The start button transmits the driver's requests to start or stop the engine to the UCH.
1.4.3.2 The UCH:
The UCH ensures that the starting conditions are met, and that no other computer on the multiplex network is
inhibiting starting of the vehicle.
If the conditions are met, it requests control of the starter from the UPC.
1.4.3.3 The Protection and Switching Unit (UPC):
The Protection and Switching Unit activates the starter motor following a request from the UCH via the multiplex
network.
1.4.3.4 Neutral sensor (manual gearbox):
Informs the UCH of the position of the gearbox (neutral or gear engaged).
1.4.3.5 Clutch switch (manual gearbox):
Sends clutch pedal depressed signal (end of travel) to the UCH.
1.4.3.6 Brake switch:
Sends brake pedal depressed signal to the UCH.
Operation:
The unknown status does not automatically require the brake pedal to be replaced, because it is a temporary
operating status between released pedal status and depressed pedal status (see diagram above).

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 - Conformity check
87B
87B -123
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check
87B
87B -123V9 MR-372-J84-87B000$387.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
KEYLESS VEHICLE FUNCTION
Sub-function: Protection
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
ProtectionET070:Start buttonPRESSED
RELEASED In the event of a fault,
consult the
interpretation of
status ET070.
ET008:blank UCHYES = If the UCH is blank.
NO = If the UCH is
programmed. In the event of a fault,
consult the
interpretation of
status ET008.
PR013:Number of cards
programmed1, 2, 3 or 4None
ET071:Unprogrammed
steering column lockYES
NO In the event of a fault,
consult the
interpretation of status
ET071.
ET119:UCH request to
steering column lockLOCKING UNLOCKINGNone
ET248:Steering column
lock immobiliser
codeINCORRECT
OKNone
ET073:Steering column
lock sensor signalFAULTY
UNLOCKED
UNDETERMINED
FALSELY TRIGGERED
SHORT CIRCUITIn the event of a fault,
consult the
interpretation of status
ET073.
ET072:Steering column
lockINCONSISTENCY
LOCKED
UNLOCKEDIn the event of a fault,
consult the
interpretation of status
ET072.
ET014:Control power levelNONE
ACCESSORIES FEED
TIMED
APCNone

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check
87B
87B -124
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check
87B
87B -124V9 MR-372-J84-87B000$387.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
KEYLESS VEHICLE FUNCTION
Sub-function: Protection (continued)
RF*: Radio frequency.
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
ProtectionET250:InjectionPROGRAMMED
BLANKNone
ET229:Injection immobiliser
codeINCORRECT
OK In the event of a fault,
consult the
interpretation of status
ET229.
ET046:Engine immobiliserINACTIVE = Vehicle
unprotected, ready to start.
ACTIVE = Vehicle protected,
starting impossible. In the event of a fault,
consult the
interpretation of
status ET046.
ET075:+ Accessories feed
presentYES
NO In the event of a fault,
refer to the
interpretation of
status ET075.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check
87B
87B -125
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check
87B
87B -125V9 MR-372-J84-87B000$387.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
KEYLESS VEHICLE FUNCTION
Sub:function: Starting
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
StartingET070:Start buttonDEPRESSED
RELEASED In the event of a fault,
consult the
interpretation of status
ET070.
ET108:Automatic gearbox
lever positionNOT IN NEUTRAL
P
NEUTRAL, REVERSEIn the event of a fault,
consult the
interpretation of status
ET108.
ET048:Clutch pedal
positionDEPRESSED
RELEASEDIn the event of a fault,
consult the
interpretation of status
ET048.
ET047:Brake pedal positionUNDETERMINED
RELEASED
DEPRESSED
INCONSISTENCY In the event of a fault,
consult the
interpretation of status
ET047.
ET110:UCH request to
injection or
Protection and
Switching UnitENGINE OFF
INACTIVE
APC
STARTING In the event of a fault,
consult the
interpretation of status
ET110.
ET169:EngineSTOPPEDIn the event of a fault,
refer to the
interpretation of
status ET169.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of statuses87B
87B - 226
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of statuses87B
87B - 226V9 MR-372-J84-87B000$559.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
ET110
UCH REQUEST TO INJECTION COMPUTER OR PROTECTION
AND SWITCHING UNIT
NOTESNo faults should be present or stored.
This status gives information concerning the type of request made by the UCH to these computers.
"ENGINE STOP": when an engine stop is requested.
"INACTIVE": without action on the vehicle.
"+ AFTER IGNITION FEED": on pressing the start button for more than 5 seconds.
"START": when starting is requested.
If the status does not correspond to the current user request, carry out a test of the multiplex network.
If the fault is still present, contact Techline.
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.
UCH_V44_ET110/UCH_V48_ET110/UCH_V4C_ET110/
UCH_V4D_ET110/UCH_V4F_ET110/UCH_V50_ET110