2008 RENAULT SCENIC brake sensor

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-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 - Fault summary table
87B
87B-69
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Fault summary table
87B
87B-69V9 MR-372-J84-87B000$258.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Fault summary table
Tool fault Diagnostic tool title Vdiag
DF001UCH
44, 48, 4C, 4D, 4F, 50 DF002Steering lock
DF003Clutch switch circuit'
DF004Brake light switch circuit
DF005Card
DF006Front left-hand wheel valve sensor
DF007Front right-hand wheel valve sensor
DF008Rear right-hand wheel valve sensor
DF009Rear left-hand wheel valve sensor
DF010Steering column control unit circuit
DF011Rain/light sensor circuit
DF012Right-hand direction indicator circuit
DF013Left-hand direction indicator circuit
DF014Card reader circuit
DF015Optical sensor circuit
DF016At least 2 identical codes/summer set
DF017At least 2 identical codes/winter set
DF018Programming of 4 codes in summer set not performed
DF019Programming of 4 codes in winter set not performed
DF020Front internal aerial circuit
DF021Rear internal aerial circuit
DF022Centre internal aerial circuit
MR-372-J84-87B000$258.mif

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Status summary table
87B
87B -140
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Status summary table
87B
87B -140V9 MR-372-J84-87B000$430.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
*RAID: Renault Anti-Intruder Device
*CPE: Electric central door locking
*Lckg: Locking Tool status Diagnostic tool title Vdiag
ET041Opening rear screenV48, V4C, V4D,
V4F, V50
ET042Passenger door V44, V48, V4C,
V4D, V4F, V50
ET043RAID* function authorisation by CPE*
V44, V48, V4C,
V4D, V4F, V50 ET044CPE* button
ET045RF signal received
ET046Engine immobiliser
ET047Brake pedal position
ET048Clutch pedal position
ET050Tailgate/Boot
ET051Rear left-hand door
ET052Rear right-hand door
ET053Driver's door
ET054Optical sensors supplied
ET055Front driver side optical sensor
ET056Rear driver side optical sensor
ET057Passenger side front/rear optical sensor
ET058Lckg* button on driver's side handles
ET059Lckg* buttons on passenger's side handles
ET060Tailgate locking button
ET061Open tailgate request
ET062Open rear screen requestV48, V4C, V4D,
V4F, V50