warning RENAULT SCENIC 2006 J84 / 2.G Electrical Equipment - Multiplexing Workshop Manual
[x] Cancel search | Manufacturer: RENAULT, Model Year: 2006, Model line: SCENIC, Model: RENAULT SCENIC 2006 J84 / 2.GPages: 15, PDF Size: 0.1 MB
Page 2 of 15
MULTIPLEXING
Fault finding - Introduction
88B
88B-1
188BMULTIPLEXING
Fault finding - Introduction
INTRODUCTION
Description of the multiplex network:
The multiplex network consists of a twisted pair of wires connected to several vehicle computers. The two wires are
known as Can H and Can L.
Two of the computers have an internal resistance of 120 Ω (terminating resistance):
–the airbag computer
–the injection computer
The network carries data exchanged by the computers.
The Scénic II is a new-generation multiplex vehicle; the main change is the increase in communication speed to
500 kBauds.
On the Scénic II, only one multiplex network can be diagnosed with the RENAULT tool.
The maximum number of computers on this network is 15.
PURPOSE:
●The purpose of the multiplex network test is to determine the various computers present on the vehicle's multiplex
network as well as the cause of possible inter-computer communication failures.
●It also serves to determine the functions installed in the vehicle, which are sometimes housed in various
computers (distributed functions).
●The test also checks the condition of multiplex network segments.
●The multiplex network test can also run diagnostics on computers disconnected from the multiplex network; this
provides an overview of the vehicles electronic architecture. WARNING
Fault-finding on the Scénic II can only be done with the CLIP diagnostic tool fitted with the new vehicle
connection probe cord (part no. Elé 1674 or 00 00 167 400).
Note:
A second multiplex network for the navigation system may also be present.
Page 5 of 15
MULTIPLEXING
Fault finding - Configuration
88B
88B-4
Fault finding - Configuration
MULTIPLEX NETWORK CONFIGURATION
In this vehicle, the two computers holding the multiplex network configuration are the airbag and UCH computers.
The Configuration screen consists of two tabs for displaying and modifying the:
–multiplex network configuration on the first tab,
–diagnosable computer configuration on the second.
LIST OF VEHICLE COMPUTERSWARNING
First repair the computers containing the multiplex network configuration (airbag and UCH) to be able to
display the screen with the multiplex network configuration diagram for the diagnosed vehicle.
ComputerMultiplex network
configurationDiagnosable
computer configuration
Via CANVia the ISO K/L
lines
InjectionPRESENT YES -
ABSPRESENT YES -
Protection and Switching UnitPRESENT YES -
Automatic gearboxPRESENT - YES
LPGPRESENT - YES
Steering lockPRESENT - -
Electric power-assisted steeringPRESENT YES -
Instrument panelPRESENT YES -
UCHPRESENT YES -
Air conditioningPRESENT YES -
Central Communications UnitPRESENT NO NO
Driving school unitPRESENT NO NO
AirbagPRESENT YES -
Automatic parking brakePRESENT - YES
Parking assistanceABSENT NO NO
Discharge bulbsABSENT - YES
Page 7 of 15
MULTIPLEXING
Fault finding - Configuration
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88B-6
NETWORK CONFIGURATION
NOTESThe configuration is detected with the ignition on.
It can be launched from the multiplex network test results screens.
The tool displays the UCH and/or airbag computer configuration.
Configuration involves the following steps:
–Select the computer to be modified.
–Select the multiplex network diagram version.
The version number increases with each change to the multiplex network wiring in this vehicle.
This information is available in the global vehicle base.
Choice of computers in the vehicle present on the network
The following computers are always fitted to the vehicle:
–Injection
–Protection and Switching Unit
–ABS
–Steering lock (cannot be support fault finding with the tool)
–Instrument panel
–Passenger Compartment Control Unit (UCH)
–Electric power-assisted steering
–Airbag
+ the vehicle options:
–Automatic gearbox
–LPG
–Climate control
–Control and Communications Unit (cannot support fault finding with the tool)
–Automatic parking brake
–Driving School Unit (cannot support fault finding with the tool)
–Discharge bulbs
–Parking assistance
WARNING
A computer connected to the multiplex network but not registered in the computers containing the multiplex
network configuration will not be checked in the multiplex network test.
Adjust the configuration by declaring any missing computers as present in the UCH or airbag computer or both.
Relaunch the multiplex network test after modifying the configuration.
Page 9 of 15
MULTIPLEXING
Diagnostics - Dealing with faults
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FAULTY COMPUTER
NOTES–Make sure the computers installed in the vehicle are the correct type and are
compatible with Mégane II.
–Check the power supply to 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: Protection and Switching Unit, air conditioning control panel, radio, Control and
Communications Unit.
–+ After ignition: Injection, ABS, airbag, Electric Power Assisted Steering, Automatic transmission, LPG,
Steering lock, Roof control unit, Driving school unit, Automatic parking brake, Parking assistance.
–+ After ignition + dipped headlights: Xenon bulbs.
WARNING
Dialogue with the Xenon bulbs is only possible with + after ignition and the dipped headlights on.
–Switch to computer diagnostics mode.
Test of communication with computers.
⇒No communication from computers to diagnostic tool: see Fault Finding Chart 1
No communication with the computer or computers not communicating with the
diagnostic tool.
Check the connections to the computers and for no open circuit. Repair if necessary.
⇒Computers that only produce partial information when identified:
Check in the Workshop Repair Manual or Global Vehicle Base to see that the computer
really is compatible with Scénic II.
Make sure the CLIP diagnostic tool update is recent enough to handle Scénic II faults.
If after these tests no irregularity or open or short circuit has been detected, contact your Techline.
AFTER REPAIRCarry out a new multiplex network test with the diagnostic tool.
Clear the stored faults on all the computers connected to the network.
Deal with any other possible faults.
Page 12 of 15
MULTIPLEXING
Fault finding - Fault finding chart
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88B- 11
Fault finding - Fault finding chart
CAN network communications failure
No communication on the K lineCHART 1
No communication with computers
NOTESVehicle computer power supply for diagnostics:
Vehicle card in 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.
WARNING: The dipped headlights must be switched on to power the Xenon
headlights.
Try the diagnostic tool on another vehicle.
Make sure the tool version is more recent than CD-ROM No. 32.
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.
Make sure the CLIP sensor is properly fed by tracks 16 (+ 12 V), and 4 and 5 (earth) of the diagnostic socket,
indicated by the two red diodes on the sensor lighting up.
Make sure that the CLIP sensor is properly connected to the computer's USB port.
Make sure that the CLIP sensor is communicating properly with the vehicle's computers; this is indicated by
the two green diodes on the sensor lighting up.
green diodes red diodes
CAN Vehicle power supply
ISO Sensor power supply
Use the diagnostic socket to check the following tracks:
track 1 + After ignition
track 16 + Battery
tracks 4 and 5 Earth
Repair if necessary.
Check line continuity and insulation:
CAN H (diagnostic socket track 6)
CAN L (diagnostic socket track 14)
With a multimeter, make sure that the voltages at the diagnostic socket terminals are:
–2.5 V between CAN H (track 6) and the earth (tracks 4 and 5)
–2.5 V between CAN L (track 14) and earth (tracks 4 and 5) (average values)
See the Help with finding short circuits on the network heading in this section for how to detect short
circuits in the vehicle's multiplex network.
Check the continuity, insulation and for absence of interference on the K line of the diagnostic socket
(track 7).