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

88B-20
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.
V3 MR-413-X44-88B000$070.mif
88B
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.
Switch off the ignition.
Finding the fault
type
NOTESObtain a copy of the multiplex network diagram for the
vehicle.
(Diagnostic socket diagram).
Measure the resistance of component 225 between the following connections:
•Connection code 133B
•Connection code 133C
What is the value obtained?
0 ΩΩ Ω ΩThe two lines are in short circuit (see Introduction - Repair advice).
60 ΩΩ Ω Ω
± 10 ΩΩ Ω Ω
Check first that the computers storing the configuration (Airbag and UCH) are
correctly supplied:
–check for earth on connection NAP, and for +12 V supply on connection AP25 on
component 756.
–check for earth on connections MAM and NAM, and for +12 V supply on
connections AP7, AP43, BP3, BP6, BP15, BP19, BP49 on component 645.
BETWEEN 70 ΩΩ Ω Ω

AND 110 ΩΩ Ω ΩFor each connection 133B and 133C, 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 two lines.
Disconnect the airbag and check the multiplex connection between the diagnostic
socket and the airbag.
Is the multiplex connection correct?
MULTIPLEXING
Fault finding – Interpretation of faults

88B-22
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.
V3 MR-413-X44-88B000$070.mif
MULTIPLEXING
Fault finding – Interpretation of faults88B
FAULTY SEGMENT ON THE MULTIPLEX NETWORK
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
It may be that the tool cannot exactly determine which segment(s) are faulty. It will then
suggest several segments that could be faulty. In this event, repair the segment closest
to the diagnostic socket.
Isolate the faulty segment by disconnecting both ends of the segment. Check the condition of the connectors.
Check the continuity and insulation of the CAN H and CAN L lines (connections 133B and 133C) between the two
connectors of the isolated segment.
Refer to the vehicle's multiplex network diagram for the allocation of tracks on the computers and connections.
Perform the necessary operations to check the continuity of the two lines (for example, replacing the wiring).
Make sure that the computer present in the vehicle is compatible and that the data it is producing is correct.
Reconnect the segment.
Carry out the multiplex network test again using the diagnostic tool.
Is the segment still declared faulty?
NOEnd of fault finding.
YESAre there other faulty segments?
NO
Repeat the multiplex network tests to ensure the continuity and insulation of the CAN
H and CAN L lines (connections 133B and 133C) between the end of the faulty
segment and the diagnostic socket.
YESApply the same procedure to each segment.

88B-23
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.
V3 MR-413-X44-88B000$070.mif
MULTIPLEXING
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.
V3 MR-413-X44-88B000$070.mif
MULTIPLEXING
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?

88B-31V3 MR-413-X44-88B000$080.mif
MULTIPLEXING
Fault finding – Fault finding chart88B
ALP 1
CONTINUED 3
Check the following connections on the diagnostic socket:
BP 19 + Battery
NAM and MAM (or MAN) 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 the wiring.
Computer connected to multiplex line V
If the fault is still present, check the continuity and the insulation of the following connections:
133B of component 225.
133C of component 225.
Use a multimeter to check that the voltages at the terminals of component 225 are approximately:
–2.5 V between CAN H (133B) and earth (NAM and MAM) (Average values)
–2.5 V between CAN L (133C) and earth (NAM and MAM) (Average values).
Computer connected to Multimedia multiplex line
If the fault is still present, check the continuity and the insulation of the following connections:
107W of component 225.
107X of component 225.
Use a multimeter to check that the voltages at the terminals of component 225 are approximately:
–2.5 V between CAN H (107W) and earth (NAM and MAM) (Average values)
–2.5 V between CAN L (107X) and earth (NAM and MAM) (Average values).
Refer to the Introduction - Repair advice to detect a short circuit on the vehicle's multiplex network.