2008 RENAULT SCENIC Electrical Equipment - Multiplexing Workshop Manual

88B - 17
MULTIPLEXING
Fault finding - Interpretation of faults
88B
V4 MR-372-J84-88B050$700_eng.mif
MULTIPLEX NETWORK NOT OPERATIONAL
NOTESFirst check that the computer at the end of the faulty segment is properly
powered (earth, + battery, + accessories or + after ignition).
Always check the computer conformity.
IMPORTANT
Switch off the ignition or remove the RENAULT card from the card reader, check that
the side lights are off and wait for 1 minute.
Finding the fault
type
NOTESUse the diagram of the multiplex network of the vehicle
(diagram of the diagnostic socket).
Measure the resistance between connections 133B and 133C on the diagnostic socket.
What is the resistance?
0 ΩΩ Ω ΩThe two lines are in short circuit (see Introduction: Repair advice).
Check that there is earth, + battery feed, + accessories feed or + after ignition feed
at the airbag computer and UCH terminals. To allocate the connections on the
computers and connections, use the vehicle diagrams for the airbag computer (756)
and the UCH (645).
For each 133B and 133C connection between the different vehicle computers, check
there is no interference resistance and no short circuit to earth or to the + battery feed.
60 ΩΩ Ω Ω
± 10 ΩΩ Ω Ω
Between 70 ΩΩ Ω Ω

and 110 ΩΩ Ω Ω
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 - 18
MULTIPLEXING
Fault finding - Interpretation of faults
88B
V4 MR-372-J84-88B050$700_eng.mif
MULTIPLEX NETWORK NOT OPERATIONAL (CONTINUED)
120 ΩΩ Ω Ω
± 10 Ω
Open circuit on one or two lines.
Disconnect the airbag and check connections 133B and 133C between the diagnostic
socket (225) and the airbag (756).
Is the multiplex connection correct?
YESCheck that the resistance is approximately 120 ΩΩ Ω Ω
± 10 Ω
between the two network connections on the airbag computer:
–If the resistance is not approximately 120 ΩΩ Ω Ω
± 10 Ω, contact
Techline.
–If the resistance is 120 ΩΩ Ω Ω
± 10 Ω, check the continuity and
absence of interference resistance of connections 133B
and 133C between the diagnostic socket (225) and the UCH
(645).
If there is a repair procedure (See Technical Note 6015A,
Repairing electrical wiring, Multiplex: Multiplex
network, Repair).
Check that the resistance is approximately 120 ΩΩ Ω Ω
between the
two network connections on the UCH computer:
–If the resistance is not approximately 120 ΩΩ Ω Ω
, contact
Techline.
Repair the multiplex connection between the diagnostic socket
and the airbag.
If there is a repair procedure (See Technical Note 6015A,
Repairing electrical wiring, Multiplex: Multiplex network,
Repair).
If the fault is still present, contact your Techline.
NO
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 - 19
MULTIPLEXING
Fault finding - Customer complaints
88B
V4 MR-372-J84-88B050$800_eng.mif
MULTIPLEXING
Fault finding - Customer complaints
NO DIALOGUE WITH THE COMPUTERS ALP 1
NO TOPOLOGY DIAGRAM OR CONFIGURATION TABLE
DISPLAY AT THE END OF THE MULTIPLEX NETWORK
TESTALP 2
CONFIGURATION TABLE DISPLAY AT THE END OF THE
MULTIPLEX NETWORK TESTALP 3
MR-372-J84-88B050$800_eng.mif

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

88B - 22
MULTIPLEXING
Fault finding - Fault Finding Chart
88B
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.

88B - 24
MULTIPLEXING
Fault finding - Fault Finding Chart
88B
V4 MR-372-J84-88B050$900_eng.mif
ALP 2No topology diagram or configuration table display at the end of
the multiplex network test
The topology cannot be displayed under the following conditions:
1. The two computers storing the multiplex network configuration have failed to respond.
2. The multiplex network is not operational, therefore dialogue is impossible.
3. The two computers storing the multiplex network configuration do not have the same configurations.
4. On the multiplex network tab on the configuration screen, an incorrect network version number has been
entered on one of the two computers storing the network configuration.
5. No network version has been entered on the two computers that store the configuration.
1 – The two computers storing the multiplex network configuration have failed to respond.
Check first that the computers storing the configuration (Airbag and UCH) are correctly supplied (earth,
+ battery, + accessories or + after ignition).
Check the condition of the multiplex network and the continuity and insulation of the multiplex line H and
multiplex line L lines between the computers storing the configuration.
2 – The multiplex network is not operational, therefore dialogue is impossible (see Network not
operational fault).
3 – The two computers that store the multiplex network configuration do not have the same configurations
(see Network configurations configuration).
4 – On the multiplex network tab on the configuration screen, an incorrect network version has been
entered on one of the two computers storing the network configuration (see Network configurations
configuration).
5 – No diagram version has been entered into the two calculators that store the configuration (see Network
configurations configuration).