display RENAULT TWINGO 2009 2.G Electrical Equipment - Multiplexing Workshop Manual

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INTRODUCTION
Description of the multiplex network:
The multiplex network consists of a twisted pair of wires connected to several vehicle computers.
These two wires are called multiplex line H and multiplex line L.
Depending on the vehicle options, there is a single multiplex network.
–the Vehicle multiplex line (injection, anti-lock braking system/electronic stability program, instrument panel, air
conditioning, rev counter, sequential gearbox, UCH, airbag/pretensioners) is always present,
–the Multimedia multiplex line (navigation, radio, display, hands-free telephone) depending on the vehicle options.
Data is exchanged by the computers on the Vehicle multiplex line and Multimedia multiplex line networks at a
communication speed of 500 kbit/s.
The Vehicle multiplex line network has two computers, each with an internal resistance of 120ΩΩ Ω Ω

(network terminating resistors):
–the injection computer,
–the airbag computer.
The Multimedia multiplex line network has two computers, each with an internal resistance of 120ΩΩ Ω Ω

(network terminating resistors):
–the A2/A3 display,
–the radio.
PURPOSE
–The purpose of the multiplex network test is to determine the computers present on the vehicle's multiplex network
as well as the cause of possible inter-computer communication faults.
–It also serves to determine the functions installed in the vehicle which are often housed in various computers
(distributed functions, e.g.: Air conditioning, Security access, etc.).
–The test also checks the condition of multiplex network segments.
–The multiplex network test can also run fault finding on computers disconnected from the multiplex network; this
provides an overview of the vehicle's electronic layout. Note:
The Vehicle and Multimedia multiplex line networks support fault finding using the RENAULT tool.
MULTIPLEXING
Fault finding – Introduction

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MULTIPLEXING
Fault finding – Introduction88B
MULTIPLEX NETWORK TEST PROCEDURE
–Establish dialogue with the computers storing the vehicle configuration (read identification).
–Read the vehicle configuration in the two computers that store the multiplex network configuration (UCH and
Airbag) for the Vehicle multiplex line network.
–Read the vehicle configuration in the computer that stores the multiplex network configuration (A2/A3 display
computer) for the Multimedia multiplex line network.
–List of computers which support fault finding read from the two configuration computers.
–Computer interrogation.
–Physical (electrical) measurements on the multiplex line network.
IMPORTANT
There are three diagnostic lines, depending on the vehicle options:
Fault finding on the computer using the vehicle multiplex network:
–Injection systems,
–ABS or ABS/ESP or vehicle speed computer (depending on the vehicle equipment),
–UCH,
–Automatic transmission (depending on the vehicle equipment),
–Lighting (depending on the vehicle equipment),
–Instrument panel,
–Airbag/pretensioners,
–Climate control (depending on the vehicle equipment),
–Driving school unit (depending on the vehicle equipment),
–LPG injection (depending on the vehicle equipment).
Fault finding on computers using the multimedia multiplex network (depending on the vehicle equipment):
–Radio (R1-08 or R2-08),
–Multimedia interface (A2/A3 display),
–Multimedia connection (C-box).
Fault finding on the computer using the K line (depending on the vehicle equipment):
–Parking distance control and power-assisted steering.

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MULTIPLEXING
Fault finding – Introduction88B
If the following error messages appear during a multiplex network test:
–Communication cannot be established with some computers: check their supply and their diagnostic line
before rerunning the test: the network topology is visible. Check to see if there are many computers that have not
been configured: update the multiplex network according to the computers present on the vehicle (see Multiplex
network configuration).
–Incorrect configuration of computers that support fault finding: check the configuration before rerunning
a test: the network topology is not visible, a network configuration is requested (see Multiplex network
configuration).
–Incorrect configuration: check the computer configuration before rerunning a test: the network topology is
not visible, a network configuration is requested (see Multiplex network configuration).
ACQUISITION AND DISPLAY OF THE RESULTS
The acquisition screen is made up of a bar graph which changes when the various initialisation, acquisition and data
analysis stages are updated.
At the end of the test, the tool displays a screen with the test result.
How to read the topological diagram:
The results display screen consists of three screens:
–the upper zone: fault finding procedure result message,
–the left-hand centre zone: topological diagram (not always available),
–the right-hand centre zone: interpretation of the results from the various vehicle computers and list.
COMPUTERS
–Valid: green border, green lettering.
–Not detected: red border, red lettering.
–Do not support fault finding: black border, black lettering.
–Not recognised: red border, red lettering + exclamation mark.
SEGMENTS
–Valid: green dash.
–Faulty: red dash.
–Cannot support fault finding: black dash.

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Fault finding – Introduction88B
Interpreting test result charts
On the Faults tab, the computers are organised into the following groups:
–Not detected if the computer failed to respond to the tool's identification request.
Within the undetected category, the computers are subdivided into Stores multiplex network configuration
and Does not store multiplex network configuration.
–Not recognised if the computer is detected but cannot be identified from its response.
On the Information tab, the computers are organised and listed as follows:
–Cannot support fault finding, if the computer cannot support fault finding with the tool and therefore was not
queried.
–Valid if the computer responded correctly to the tool's request.
If the Proceed icon in the bottom right-hand corner is selected, a new screen will appear with the following tab:
Under the Results tab the computers are organised into the following groups:
–Faulty if the computer is known and has a non-zero number of faults.
–OK if the computer was detected, recognised and has no faults.
–Not recognised if the computer was detected but could not be identified from its response.
–Not detected if the computer can support fault finding but failed to respond.
FUNCTION TESTING
The function test can be accessed by clicking on the List of functions icon.
–The vehicle function tests screen resembles the multiplex network test screen with a diagram of the network layout
if this is known and displayed.
–The Function tab displays the different computers involved in the functions, which may be distributed over several
computers.
Examples for the Vehicle multiplex line network:
•Air conditioning: UCH, INJ, and CLIM.
•Access - Safety: UCH and INJ
•Wiping: UCH
•Lighting: UCH
Examples for the Multimedia multiplex line network:
•Radio.
•Multimedia interface (A2/A3 display)
•Multimedia connection (C-box)
–The Info tab displays the other possible functions found on the vehicle concerned.
–Selecting a function from the list of functions enables computers not involved in this function to be shaded, thus
indicating the computers involved in this function.
–The Fault finding button runs fault finding on the function selected from the list.

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Multiplexing enables signals to be sent between different computers on the vehicle, such as:
119 Automatic transmission computer 756 Airbag pretensioners/computer
120 Injection computer 995 Electronic rev counter
247 Instrument panel 1094 ABS/ESP computer
419 Air conditioning computer 1222 Parking distance control computer
502 Power-assisted steering computer 261 Radio
645 UCH 225 Diagnostic socket
653 Multimedia interface (A2/A3 display) 1959 Multimedia connection (C-box)
1222 247 995
502
645
120 119 65310941959
225261419
756
MULTIPLEXING
Fault finding – List and location of components

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MULTIPLEX NETWORK CONFIGURATION
For the
CAN Vehicle network:
The tool displays the UCH and/or Airbag configurations.
The Configuration screen consists of two tabs for displaying and modifying the:
–The first tab, Multiplex network configuration, indicates the multiplex network version and the list of computers
defined as present on the multiplex network.
–The second tab, Configuration of computers which support fault finding, indicates the relevant diagram
number, and the list of computers defined as supporting fault finding with the RENAULT tool.
First repair the computers containing the multiplex network configuration (Airbag and UCH) in order to
display the screen with the multiplex network configuration diagram for the vehicle on which fault finding is
being run.
For the
CAN Multimedia network:
The tool presents the configuration of the A2/A3 display.
The Configuration screen consists of two tabs for displaying and modifying the:
–The first tab, Multiplex network configuration, indicates the multiplex network version and the list of computers
defined as present on the multiplex network.
–The second tab, Configuration of computers which support fault finding, indicates the relevant diagram
number, and the list of computers defined as supporting fault finding with the RENAULT tool.
NOTESThe configuration is entered with the ignition on; apply the forced + after ignition
feed procedure (see Introduction).
It can be run from the multiplex network test results screens.
WARNING: the network version number is 1.
This is the diagram version which changes each time the multiplex network wiring is modified on this vehicle.
WARNING: the network version number is 1.
This is the diagram version which changes each time the multiplex network wiring is modified on this vehicle.
MULTIPLEXING
Fault finding – Configuration

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MULTIPLEXING
Fault finding – Configuration88B
First repair the computer containing the multiplex network configuration (A2/A3 display) in order to display
the screen with the multiplex network configuration diagram for the vehicle on which fault finding is being
run.
Here is the list of computers according to the radio equipment:
Radio R1-08:
–Radio R1-08
–A2 display
Radio R2-08:
–Radio R2-08
–A3 display
–Multimedia connection (C-box)
IMPORTANT
A computer connected to the multiplex network but not declared as being among the computers containing the
multiplex network configuration will not be checked in the multiplex network test.
Correct the configuration by declaring the missing computer as present in the computer or computers containing
the configuration.
Start the multiplex network test again after modifying the configuration.

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CAN Vehicle configuration screen
Make sure that the information displayed on the two tabs is correct.
The same configuration information for the two computers is essential for displaying the network topology.
Option: depending on equipment level
CAN Multimedia configuration screen Computer Multiplex network configurationConfiguration of computers that
can support fault finding
Injection (120) PRESENT YES
ABS/ESP (1094) PRESENT YES
Instrument panel (247) PRESENT YES
UCH (645) PRESENT YES
Airbag/pretensioners (756) PRESENT YES
Air conditioning (regulated) (419) PRESENT (option) YES (option)
Sequential gearbox (119) PRESENT (option) YES (option)
Power-assisted steering (502) ABSENT (option) YES (on K line) (option)
Rev counter (995) PRESENT (option) YES (option)
Parking distance control (1222) ABSENT YES (on K line)
A2/A3 display (653) PRESENT (option) YES (option)
Computer Multiplex network configurationConfiguration of computers that
can support fault finding
A2/A3 display (653) PRESENT YES
Radio R1-08 or R2-08 (261) PRESENT or ABSENT (option) YES or NO (option)

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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.
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Fault finding – Interpretation of faults88B
FAULTY COMPUTER
Vehicle multiplex network
NOTESMake sure that the computers installed in the vehicle are the correct type and are
compatible with the vehicle.
Check that the computers are correctly supplied (earth, + battery feed,
+ accessories feed or + after ignition feed).
Make sure that the computer wake-up mode is in full working order on the vehicle and is properly assimilated
by the computers.
The wake-up mode is:
–Timed supply: UCH,
–+ accessories feed: Air conditioning, ABS/ESP.
–+ after ignition feed: Injection, Airbag/Pretensioners, Sequential gearbox, Instrument panel.
In + accessories feed these computers will not appear.
–Switch to computer fault finding mode.
Attempt to establish dialogue with computers.
No communication from computers to diagnostic tool: see ALP 1
No communication with the computer or computers not communicating with the diagnostic tool.
Check the connections to the computers and that there are no open circuits.
Repair if necessary.
Computers are not displaying all the information on their identifications:
Check in the Workshop Repair Manual or the World Vehicle Database that the computer is compatible
with the vehicle.
Check that the CLIP diagnostic tool update is recent enough to be able to deal with faults on the vehicle.
If no faults or open or short circuits have been detected after these checks, contact Techline.

88B-24
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.
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Fault finding – Interpretation of faults88B
FAULTY COMPUTER (continued 1)
Multimedia multiplex network
NOTESSwitch off the vehicle ignition.
Measure the resistance of component 225 between the following Multimedia multiplex line connections:
–connection code 107X
–connection code 107W
What is the value of the resistance?
0 ΩΩ Ω ΩThe two lines are in short circuit (see Introduction - Repair advice).
60 ΩΩ Ω Ω
± 10 ΩΩ Ω Ω
For radio R1-08 and radio R2-08:
Check for earth on connection MA0, and for +12 V supply on connection BCP4 to the
radio 261.
Check for earth on connection NAM, and for +12 V supply on connection BCP4 and
BPT to the display 653.
For the Multimedia connection (C-box):
Check for earth on connection NAM, and for +12 V supply on connection BCP4 to the
Multimedia connection computer (C-box) 1959.
BETWEEN 70 ΩΩ Ω Ω

AND 110 ΩΩ Ω ΩFor each of Multimedia multiplex line connections 107X and 107W, check that there
is no interference resistance and then check that there is no short circuit to earth or to
the + battery feed.
120 ΩΩ Ω Ω
± 10 ΩΩ Ω Ω
Open circuit on one or both lines
For radio R1-08 and radio R2-08
Disconnect component 261 and check the multimedia multiplex connections 107X
and 107W between components 225 and 261.
For the Multimedia connection (C-box):
Disconnect component 1959 and check the multimedia multiplex connections
107X and 107W between components 225 and 1959.
Is the multiplex connection correct?