ECO mode RENAULT SCENIC 2011 J95 / 3.G Air Bag ACU4 - Seat Belt Pretensioners Workshop Manual

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Introduction
88C
88C - 3V3 MR-372-J84-88C000$010.mif
AIRBAG ACU4
Vdiag: 04
3. REMINDERS
Procedure:
To run diagnostics on the vehicle's computers, switch on the ignition in fault finding mode (+ after ignition forced
setting):
– vehicle card in card reader.
– Press and hold start button (longer than 5 seconds) with start-up conditions not fulfilled,
– Then connect the diagnostic tool and perform the required operations.
+ After ignition feed cut-out is performed as follows:
– Disconnect the diagnostic tool,
– Press the start button twice briefly (less then 3 seconds),
– See that the + after ignition feed has been cut off by checking that the computer warning lights on the instrument
panel have gone out.
Faults:
Faults are declared to be either present or stored (depending on whether they appeared in a certain situation and
have disappeared since, or whether they remain but are not diagnosed within the current context).
The present or stored state of faults should be taken into consideration when the diagnostic tool is used after the
+ after ignition feed (without acting on the system components).
Deal with present faults according to the procedure specified in the Interpretation of faults section.
For stored faults, note the faults displayed and follow the instructions in the "Notes" section.
If the fault is confirmed when the instructions in the Notes section are applied, the fault is present. In this case, deal
with the fault
If the fault is not confirmed, carry out basic checks. Check:
– the electrical lines which correspond to the fault,
– the connectors for these lines (for oxidation, bent pins, etc.),
– - the resistance of the faulty component,
– the condition of the wires (melted or cut insulation, wear).
or use the fault finding procedure to check the circuit of the faulty component.
Conformity check
The conformity check is designed to check the states and parameters which do not display any faults on the
diagnostic tool when inconsistent. This phase therefore:
– diagnosis of faults that do not have a fault display, and which may correspond to a customer complaint.
– checks that the system is operating correctly and that there is no risk of a fault reappearing after repairs.
This section gives the fault finding procedures for states and parameters and the conditions for checking them.
If a state is not behaving normally or a parameter is outside permitted tolerance values, you should consult the
corresponding fault finding page.
Customer complaints – Fault finding charts
If the diagnostic tool check is correct, but the customer complaint persists, it should be dealt with according to the
customer complaint.IMPORTANT
The left-hand and right-hand Xenon bulb computers are powered when the dipped headlights are lit. Fault finding
procedures can only be carried out on them after the ignition has been switched on in fault finding mode (+ after
ignition imposed) and the dipped headlights are on.
A synopsis of the general procedure to follow is provided on the following
page in the form of a logic flow chart.
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Introduction
88C
88C - 5V3 MR-372-J84-88C000$010.mif
AIRBAG ACU4
Vdiag: 04
All faults requiring replacement of a computer for thorough fault finding with the appropriate tools. The diagnostic
sheet must be filled out during the process and indicate the findings for the warranty refund.
6. SAFETY INSTRUCTIONS
All work on components requires obeying safety rules to prevent physical damage or human injury:
– Make sure the battery is properly charged to avoid damaging the computers with a low charge.
During operations on the airbag/seat belt pretensioner systems it is vital that you lock the computer using
the diagnostic tool to prevent any risk of accidental triggering (all the ignition lines will be inhibited). The
locked mode is signalled when the Instrument panel warning light comes on.
If it is impossible to connect the fault-finding tool, switch off the ignition, remove the system power fuse,
and wait at least 2 seconds for the reserve power capacity to discharge.
Never measure the airbag or pretensioner trigger lines with any device other than XRBAG or CLIP's "Airbag
and pretensioner wiring harness check".
Before using a dummy ignition module, ensure that its resistance is between 1.8 and 2.5 ohms.
While working, make sure the computer power supply does not drop below 10 V. WARNING!
5. FAULT FINDING LOG
WARNING:
A properly documented diagnostic sheet is required for all monitored part (computer-type)
reimbursements or Techline calls.
IT IS THEREFORE COMPULSORY TO FILL OUT A FAULT FINDING SHEET EVERY
TIME
A FAULT FINDING OPERATION IS PERFORMED.
WARNING
Airbag and pretensioner destruction and disposal is subject to national legislation.
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Configuration and programming
88C - 15
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AIRBAG ACU4
Vdiag: 04
CONFIGURATION / READ CONFIGURATION (continued):
Passenger airbag lock mode "WITH KEY" or "WITHOUT":
Read type of vehicle: LC034 "MEGANE II"
OTHER COMMANDS:
–VP006: Lock computer.
This command is used whenever servicing the system. It shuts down all trigger lines.
–VP007: Unlock computer.
This command unlocks the computer after it was locked.
–VP008: Write last After Sales service date.
This command is used to enter the date the system was serviced.
–VP010: Write VIN.
This command serves to enter the vehicle identification number (VIN) into the computer.
–SC004: Read impact context.
This command is used in reconditioning the vehicle following an impact. It obtains, from the
computer that is to be replaced, a list of the trigger lines controlled and the system's state at the
moment of impact.TITLECONFIGURATION
READINGCONFIGURATION
PASSENGER AIRBAG LOCK MODELC060 CF248
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Fault finding chart
88C - 68
88C
V3 MR-372-J84-88C000$100.mif
AIRBAG ACU4
Vdiag: 04
AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Fault finding chart
CHART 1 No communication with the airbag computer
NOTESSpecial note: To perform fault finding on the vehicle computers, switch on the
ignition in fault finding mode (+ after ignition imposed), i.e. proceed as follows:
–Vehicle card in card reader, press on the Start button for more than five
seconds outside of starting conditions.
Ensure that the diagnostic tool is not causing the fault by trying to establish dialogue with a computer on
another vehicle. If the tool is not the problem and communication cannot be established with any other
computer in the same vehicle, check the battery voltage and do the work required to obtain the proper reading
(10.5 V < battery voltage < 16 V).
Check the presence and condition of the airbag computer supply voltage fuse.
Check that the computer connector is properly connected and check the condition of its wiring.
Check that the computer is correctly supplied:
– Disconnect the airbag computer and attach 22-track adapter (Elé. 1685).
– Check and ensure the presence of + after ignition feed between the terminals marked earth and
+ after ignition feed.
Ensure that the diagnostic socket is correctly supplied:
–+ Before ignition on track 16.
–+ after ignition feed on track 1
–Earth on tracks 4 and 5.
With 22-track adapter (Elé. 1685), check the continuity and insulation of the airbag computer / diagnostic
socket connection between:
Terminal block track CAN H Track 6 of the diagnostic socket
Terminal block track CAN L Track 14 of the diagnostic socket
If communication is still not established after these various tests, contact your Techline (see the "Help" section
for details).
AFTER REPAIRWhen communication is established, deal with any faults indicated.
ACU4 Vdiag04 J84 1.0
MR-372-J84-88C000$100.mif