battery RENAULT SCENIC 2006 J84 / 2.G Electrical Equipment - Multiplexing Workshop Manual

MULTIPLEXING
Diagnostics - Dealing with faults
88B
88B-7
Diagnostics - Dealing with faults
FAULTY SEGMENT
NOTESFirst check that the computer at the end of the faulty segment is properly
supplied (earth, + battery, + accessories or + after ignition).
Always check that the computer is operating correctly.
Important: the tool may not be able to pinpoint the faulty segment(s). It then suggests
several segments that could be faulty. In this event, repair the segment nearest to the
diagnostic socket.
Isolate the faulty segment by disconnecting both ends of the segment. Check the condition of the connections.
Check the continuity of the Can H and Can L lines between the two connectors of the isolated segment.
Refer to the Help with finding short circuits section for computer and connection track allocations.
Perform the necessary operations to ensure the continuity of the two lines (for example, replacing the wiring).
Make sure the computer present in the vehicle is compatible with the Scénic II and that the data it is producing
is correct.
Reconnect the segment.
Carry out a new multiplex network test with the diagnostic tool.
Is the segment still declared faulty?
NoEnd of fault finding.
YesAre there other faulty segments?
NoRepeat the multiplex network tests to check the continuity and
insulation of the Can H and Can L lines between the end of the
faulty segment and the diagnostic socket.
YesApply the same procedure to each segment.
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.

MULTIPLEXING
Diagnostics - Dealing with faults
88B
88B-8
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.

MULTIPLEXING
Diagnostics - Dealing with faults
88B
88B-10
MULTIPLEX NETWORK OUT OF ORDER
Help finding network short circuits
NOTESGet a copy of the multiplex network wiring diagram for the vehicle and the diagnostic
socket diagram.
In the event of a short-circuit to + battery, leave the battery connected.
The test procedure involves disconnecting the various network components in sequence to pinpoint the faulty
one.
Check the condition of the connectors.
Check the condition of the multiplex network wires (CAN H - CAN L).
Repair the damaged components.
Systematically repeat the multiplex network test after each operation to see if the fault has been resolved. If
the fault is still shown as present, continue disconnecting the connectors and computers one by one.
Input Output
Connector Can H Can L Connector Can H Can L
Protection and Switching Unit Siemens PEH blue 10 8 PEH blue 11/12 7/9
K4J injection S 3000 C 2AN A black A4 A3
K4M - F4R injection S 3000 C 2AN A black A4 A3 2AN B brown K4 K3
K9K injection LVCR 2AN A black A4 A3
F9Q injection EDC 16 C Black A4 A3
Automatic transmission DP0 Black 38 39
ABS - ESP Black 35 14
ABS Black 26 15
Electric power-assisted steering TRW Black 7 5 Black 6
4
Airbag Black 11 10
Climate control Black 7 1
Steering lock Black 3 6
UCH PE 2 black 6 16 10/8 20/18
Instrument panelGrey
30 29 Red 2 3
Driving school unitBlack
A3 B3
Central communications unit Green 6 7 Grey 3 4
Automatic parking brake Grey A3 A2
R 2 Grey 2 3
R 369White
12 13
OBD (On Board Diagnostic)Black
614
If the fault is not visible, 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.

MULTIPLEXING
Fault finding - Fault finding chart
88B
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).