2008 RENAULT SCENIC airbag

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 - 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).

88B - 25
MULTIPLEXING
Fault finding - Fault Finding Chart
88B
V4 MR-372-J84-88B050$900_eng.mif
ALP 3Configuration table display at the end of the
multiplex network test
NOTESALP to use if the tool loads the configuration screen at the end of the multiplex network
test.
The configuration chart is always accessible through the Configuration icon.
Update the vehicle configuration then run the multiplex network test again.
Check that the two tabs are consistent before running the test again.
The CLIP diagnostic tool loads the configuration screen directly under the following conditions:
●MULTIPLEX NETWORK tab
–Inconsistency between the network version numbers entered into the two computers that store the
multiplex network configuration. If the numbers are inconsistent, the following error message is
displayed when the multiplex network test is being run: Inconsistent configuration of computers
supporting fault finding: check configuration before rerunning test.
–Inconsistent list of computers entered into the computers that store the multiplex network configuration.
–The diagram version number is incorrect for at least one of the two computers that store the multiplex
network configuration (see the Network configurations configuration).
–In this instance, the following message is displayed when the multiplex network test is being run:
Unknown vehicle configuration: check tool update.
–One of the two computers that store the network version is blank (case of replaced airbag or UCH
computer).
●COMPUTERS SUPPORTING FAULT FINDING tab
–Inconsistent diagram numbers entered into the two computers that store the configuration.
–Inconsistency in the list of computers that can support fault finding entered into the two computers that
store the list of computers that can support fault finding.
–Inconsistency between the list of computers entered and the computers actually detected on the
vehicle. Some computers are entered as absent in the computer that stores the network configuration
even though they are present on the vehicle (see the Multiplex network configurations
configuration). In this instance, the following error message is displayed when the multiplex network
test is being run: Some computers respond to the diagnostic tool even if they are not listed in the
computer configuration.