headlights RENAULT SCENIC 2008 J84 / 2.G Electrical Equipment - Multiplexing Workshop Manual

88B - 3
MULTIPLEXING
Fault finding - Introduction
88B
V4 MR-372-J84-88B050$100_eng.mif
MULTIPLEX NETWORK OPERATION TEST
This step is the essential starting point for any computer fault finding procedure.
It ensures that the network is correctly connected at the terminals of each computer and that the signal is correctly
sent to it and received by it. On the Scénic II ph2, this function also reads the number of faults present on the
computers.
The multiplex network test function is executed automatically after vehicle selection by the user.
After the network check, the other functions become accessible.
MULTIPLEX NETWORK TEST PROCEDURE
–Establish dialogue with the computers storing the vehicle configuration (read identification).
–Vehicle configuration read on the two computers that hold the multiplex network configuration (airbag and UCH
on the SCENIC II ph2).
–List of computers that can support fault finding read from the two computers that hold the multiplex network
configuration.
–Computer interrogation.
–Physical (electronic) measurements on the multiplex line network. Vehicle computer power supply for fault finding:
insert the vehicle card in the card reader.
Press and hold (over 5 seconds) the Start button in the absence of start conditions (for example: selecting a gear).
Connect the diagnostic tool and perform the required operations.
IMPORTANT
To supply the discharge bulb computer, switch on the dipped headlights.

88B - 15
MULTIPLEXING
Fault finding - Interpretation of faults
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V4 MR-372-J84-88B050$700_eng.mif
FAULTY COMPUTER
NOTES–Make sure the computers installed in the vehicle are the correct type and are
compatible with the Scénic II ph2.
–Check the power supply of the computers (earth, + battery, + accessories or + after
ignition).
Make sure that the computer wake-up mode is in full working order on the vehicle and properly assimilated by the
computers.
The wake-up mode is:
–timed power supply: UCH, instrument panel.
–+ accessories feed: Protection and Switching Unit, Heating and Air Conditioning System, Central
Communication Unit.
–+ After ignition feed: Injection, ABS/ESP, airbag, Electric Power-Assisted Steering, Automatic
Transmission, LPG/Natural Gas Fuel, Steering column lock, Driving School Unit, Automatic Parking
Brake, Parking Distance Control.
–+ After ignition + dipped headlights: Xenon bulbs.
IMPORTANT
Only establish dialogue with the discharge bulbs with + after ignition and the dipped headlights on.
–Switch to computer diagnostics mode.
Attempt to establish dialogue with computers.
●No dialogue from computers to diagnostic tool: see ALP 1
No dialogue with the computer or computers not communicating with the diagnostic tool.
Check the connections to the computers and that there are no open circuits.
If there is a repair procedure (see Technical Note 6015A, Repairing electrical wiring, wiring:
precautions for repairs), repair the connectors, otherwise change them.
●The computers only produce partial information when identified:
Check in the MR or World Vehicle Database to see that the computer really is compatible with the
Scénic II ph2.
Make sure the CLIP diagnostic tool update is recent enough to handle Scénic II ph2 faults.
If after these tests no faults or open or short circuits have been detected, contact your Techline.
AFTER REPAIRRun the multiplex network test again using the diagnostic tool.
Clear the stored faults on all the computers connected to the network.
Deal with any other faults.

88B - 20
MULTIPLEXING
Fault finding - Fault Finding Chart
88B
V4 MR-372-J84-88B050$900_eng.mif
MULTIPLEXING
Fault finding - Fault Finding Chart
ALP 1 No dialogue with computers
NOTESVehicle computer power supply for fault finding:
insert the vehicle card in the card reader.
Press and hold (over 5 seconds) the Start button in the absence of start conditions (for
example: selecting a gear).
Connect the diagnostic tool and perform the required operations.
IMPORTANT
To supply the discharge bulb computers, switch on the dipped headlights.
Use Technical Note Wiring diagram, Scénic II ph2.
Try the diagnostic tool on another vehicle.
Make sure the tool has a more recent update than CD 64.
Check:
–The connection between the diagnostic tool and socket (connection and cable in good condition).
–The computers' power supply.
–The engine compartment and passenger compartment fuses.
MR-372-J84-88B050$900_eng.mif

88B - 21
MULTIPLEXING
Fault finding - Fault Finding Chart
88B
V4 MR-372-J84-88B050$900_eng.mif
ALP 1
CONTINUED 1
NOTESVehicle computer power supply for fault finding:
insert the vehicle card in the card reader.
Press and hold (over 5 seconds) the Start button in the absence of start conditions (for
example: selecting a gear).
Connect the diagnostic tool and perform the required operations.
IMPORTANT
To supply the discharge bulb computers, switch on the dipped headlights.
Use Technical Note Wiring diagram, Scénic II ph2.
Check that the CLIP sensor is supplied by the following connections: BP32 (+ 12 V), NAM and MAM (earths) on
the diagnostic socket. If the check is correct go to the next step according to the type of sensor used:
1. Renault fault finding sensor (with wire connection only):
displayed by the two red diodes on the sensor coming on.
Check that the CLIP sensor is supplied by the computer's USB port (red diode). If it is not, try with another cable,
another sensor or another clip in order to determine the defective component.
Make sure that the CLIP sensor is communicating properly with the vehicle's computers; this can be seen by the
two green diodes on the sensor lighting up. If not, check that the test conditions have been met (+ after ignition
feed, vehicle selection, etc.) otherwise apply the electrical checks below.
green LEDs red LEDs
multiplex line Vehicle supply through diagnostic socket
ISOSensor supply through USB port

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MULTIPLEXING
Fault finding - Fault Finding Chart
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V4 MR-372-J84-88B050$900_eng.mif
ALP 1
CONTINUED 2
NOTESVehicle computer power supply for fault finding:
insert the vehicle card in the card reader.
Press and hold (over 5 seconds) the Start button in the absence of start conditions (for
example: selecting a gear).
Connect the diagnostic tool and perform the required operations.
IMPORTANT
To supply the discharge bulb computers, switch on the dipped headlights.
Use Technical Note Wiring diagram, Scénic II ph2.
2. Alliance fault finding sensor (with the possibility of a wireless connection):
Deal with the fault finding for each warning light in the following order of priority: from warning light 1 to warning light 3.
Description
of warning
lights
displayed on
the sensor
from left to
rightWarning light 1 shows
the supply statusWarning light 2 shows
the type and status of
the connectionWarning light 3 shows
the level of
communication with
the vehicleReserved
for the
Nissan tool
OffSensor not connected to
the vehicle or
connection faultNo connection to clip or
connection faultNo dialogue with the
computers-
GreenSensor supplied Wireless connectionGreen flashing:
communication in progress-
Orange-Connection with USB port - -
RedInitialisation fault - Communication error -
To be
checkedIf red or off:
–Fault with initialisation
or connections;
disconnect and
reconnect several
times and if there is
no conclusive result
try with another
sensor. If the sensor
works then replace
the sensorIf off:
–With a wireless
connection: Try with a
USB cable. If the
warning light is orange,
check the wireless
connection configuration
and if it is not correct,
call the Technical
Assistance (Techline).
–With a wired connection:
Try with another cable,
another clip or another
sensor in order to
determine the defective
component.If warning light 3 is off or
red and warning light 2 is
on:
–in this case, during the
multiplex network test
check that the green
warning light flashes and
that the test conditions
have been met (+ after
ignition feed, vehicle
selection, etc.) otherwise
apply the electrical
checks below.If the
warning
light is on:
Contact
Technical
Assistance
(Techline).

88B - 23
MULTIPLEXING
Fault finding - Fault Finding Chart
88B
V4 MR-372-J84-88B050$900_eng.mif
ALP 1
CONTINUED 3
NOTESVehicle computer power supply for fault finding:
insert the vehicle card in the card reader.
Press and hold (over 5 seconds) the Start button in the absence of start conditions (for
example: selecting a gear).
Connect the diagnostic tool and perform the required operations.
IMPORTANT
To supply the discharge bulb computers, switch on the dipped headlights.
Use Technical Note Wiring diagram, Scénic II ph2.
Check the following connections on the diagnostic socket:
BP 32 + battery feed
NAM and MAM Earth
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.
Computer connected to multiplex line V
If the fault is still present, check the continuity and the insulation of the following connections:
Multiplex line H (133B of component 225)
Multiplex line L (133C of component 225)
Use a multimeter to check that the voltages at the terminals of component 225 are approximately:
–2.5 V between multiplex line H (133B) and the earth (NAM and MAM) (Average values)
–2.5 V between multiplex line L (133C) and the earth (NAM and MAM) (Average values).
Refer to the Introduction - “Repair advice” to detect a short circuit on the vehicle's multiplex network.