warning 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 - Introduction
88C - 7
88C
V3 MR-372-J84-88C000$010.mif
SYSTEM CONFIGURATION DIAGRAM (REAR section)
AIRBAG ACU4
Vdiag: 04
ACU4 Vdiag04 J84 1.0
Correct insulation value: display ≥ 100.h or 9999
flashing. AR
A
B
C
D
E
G
H
ITo rear wiring
Central unit
Driver’s seat
Front passenger
seat
Buckle
pretensioner
Driver's front
airbag ignition
module
Passenger's front
airbag ignition
module
Front side airbag
ignition module
Lap belt
pretensioner or
seat cushion
airbagJ/K
L/M
N/O
CT
PCurtain airbag
ignition modules
Rear side airbag
ignition modules
Rear seat belt
retractors
Rotary switch
+ 12 V / earth
Warning light /
Fault finding lines
Impact sensors/
Impact information
Passenger airbag
lock switchFRONT AIRBAGS
Measuring
pointCorrect value
DriverC0, C2 and
C41.8 to 6.2Ω
PassengerC0 and C4 1.8 to 4 Ω
SIDE AIRBAGS AND
PRETENSIONERS
Measuring
pointCorrect value
C0, C1 and
C31.8 to 4 Ω

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding – Replacement of components
88C-12
88C
V3 MR-372-J84-88C000$040.mif
AIRBAG ACU4
VDIAG No.: 04
AIRBAG - SEAT BELT PRETENSIONERS
Fault finding – Replacement of components
REPLACING THE AIRBAG COMPUTER
BEFORE REPLACING ANY COMPUTER, YOU ARE REQUIRED TO CONTACT YOUR
TECHLINE.
So that the failure of the returned computer can be analyzed, the use of command RZ001
"erase fault memory" when DF001 "Computer" is present or stored is officially prohibited.
The airbag computers are sold in locked mode to avoid all risk of accidental triggering (all ignition lines are
inhibited).
The locked mode is signalled when the airbag fault warning indicator lights up on the instrument panel.
Follow this procedure to replace an airbag computer:
– Ensure that the ignition is switched off.
– Replace the computer.
– Modify the computer configuration if necessary.
– Enter the VIN into the computer with diagnostic tool command VP010 Write VIN.
– Switch off the ignition.
– Carry out a check using the diagnostic tool.
– Enter the After Sales operation date with diagnostic tool command VP008 Write last After Sales operation
date.
– Unlock the computer only if no faults are indicated by the diagnostic tool.
After an ACU4 computer has been replaced with a RC5 computer, it is also necessary to replace the impact
sensors. The ACU4 sensors are incompatible with the RC5 computer.
Note:
After the airbag computer is replaced, if the engine no longer starts, restore the injection operation by applying the
following procedure:
– Run command RZ001 to clear the faults from the injection computer memory (even if no present or stored faults
are declared).
– Switch off the ignition and wait for loss of dialogue with the injection computer.
– Drive for 1 minute at a speed greater than 21 mph (35 km/h) to restore the operation of the steering column lock.
ACU4 Vdiag04 J84 1.0

List of monitored parts: Airbag computer
FAULT FINDING LOG
System: Airbags and pretensionersPage 1 / 2
●Administrative identification
Date 2 0
Log completed by
Business name or no./
Country
Vehicle model
VIN:
Engine
Diagnostic tool CLIP
Version
●Customer complaint
1192 Airbag warning light lit
OtherPlease specify:
●
When the fault appears
011 When switched on 004 Intermittently 999 When starting the engine
005 While driving
OtherPlease specify:
●
Documentation used in fault finding
Fault finding procedure
Type of fault finding manual:
Workshop Repair Manual: Technical Note Assisted fault finding
Fault Finding Manual No.:
Wiring diagram used
Wiring Diagram Technical Note No.:
Other documentation
Title and/or part no.:
FD 16
Fault finding log
page to print or photocopy - page to print or photocopy - page to print or photocopy

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Summary table of faults
88C - 18
88C
V3
AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Summary table of faults
AIRBAG ACU4
Vdiag: 04
Tool fault Associated DTC Diagnostic tool heading
DF001
DF002
DF010
DF028
DF034
DF039
DF040
DF051
DF052
DF053
DF060
DF065
DF066
DF067
DF068
DF069
DF070
DF071
DF072
DF074
DF075
DF077
DF091
DF187
DF193
DF194
DF210
DF214
DF232
DF239
DF240
DF2419080
9042
9040
9041
907E
9035
9036
9035
9036
9031
9050
9031
900E
900D
900C
900A
9009
9008
9007
9006
9005
900B
9034
9044
907C
907F
9014
9034
9051
9017
9001
9002Computer
Computer supply voltage
Fault warning light circuit
Passenger's airbag status warning light circuit
Computer locked
Driver's side sensor circuit
Passenger's side sensor circuit
Driver's side sensor configuration
Passenger side sensor configuration
Driver's seat position sensor
Multiplex network
Driver's front seat position sensor circuit
Passenger's rear side air bag circuit
Driver's rear chest side airbag circuit
Passenger's front side airbag circuit
Passenger's curtain side airbag circuit
Driver's head side airbag circuit.
Driver's front airbag circuit 2
Driver's front airbag circuit 1
Passenger's front airbag circuit 2
Passenger's front airbag circuit 1
Driver's front side airbag circuit
airbag locking switch circuit
Trigger lines configuration
Change of status of passenger airbag locking
Computer to be replaced following impact
Front buckles pretensioner circuit
Airbag lock switch configuration
Driver's seat belt buckle sensor circuit
Rear seat belt retractors circuit
Driver's seat-cushion / seat lap belt circuit
Passenger's seat-cushion / seat lap belt circuit
ACU4 Vdiag04 J84 1.0
MR-372-J84-88C000$060.mif

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Interpretation of faults
88C-21
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF010
PRESENT
FAULT WARNING LIGHT CIRCUIT
1.DEF: External diagnostics (instrument panel signal)
2.DEF: Consistency (dashboard indicator light state signal / airbag request)
NOTESSpecial notes: none.
Apply the fault finding procedure relevant to this fault in the instrument panel fault finding information section.
AFTER REPAIRClear the computer memory then switch off the ignition.
Carry out the check again using the diagnostic tool and, if there are no faults, unlock
the computer.
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Fault Interpretation
88C - 53
88C
V3 MR-372-J84-88C000$072.mif
AIRBAG ACU4
Vdiag: 04
DF193
PRESENT
PASSENGER AIRBAG LOCKING CHANGE OF STATE
NOTESSpecial features: the vehicle user has 10 seconds after switching on + after ignition
feed to inhibit the passenger airbag with the switch. After this time, the computer will
store this fault and light up the warning light on the instrument panel. Switching the
ignition off and on erases this fault from the computer memory.
Set the locking switch to the desired position, switch the ignition off and wait for a few seconds.
Switch the ignition back on and check that the fault is gone.
AFTER REPAIRClear the computer memory then switch off the ignition.
Carry out the check again using the diagnostic tool and, if there are no faults, unlock
the computer.
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - States and parameter summary table88C
88C - 66V3 MR-372-J84-88C000$080.mif
AIRBAG ACU4
Vdiag: 04
AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - States and parameter summary table
ACU4 AIRBAG STATES SUMMARY TABLE:
ACU4 AIRBAG PARAMETERS SUMMARY TABLE:
The trigger line or sensor impedance is 99.9Ω when the component is disconnected or not controlled by the
computer.STATES
TOOLDIAGNOSTIC TOOL HEADINGS
ET010
ET072
ET073
ET074
ET076
ET103
ET105
ET108
ET143
ET144Impact detected
Passenger airbag status indicator light commanded
Computer locked by tool
Fault warning light commanded
Computer to replace
Type of passenger airbag lock
Locked diagnostics power supply out of limits
Passenger airbag lock mode
Passenger airbag(s) locked
Fault present or in memory
PARAMETERS
TOOLDIAGNOSTIC TOOL HEADINGS
PR001
PR002
PR104
PR105
PR106
PR107
PR108
PR109
PR110
PR111
PR112
PR113
PR114
PR115
PR116
PR117
PR118
PR140
PR147Computer supply voltage
Vehicle type
Driver's seat sensor impedance
Line 1 impedance (Driver's seat / lap airbag circuit).
Line 2 impedance (Passenger's seat / lap airbag circuit).
Line 3 impedance (Passenger's front airbag circuit 1).
Line 4 impedance (Passenger's front airbag circuit 2).
Line 5 impedance (Driver's front airbag circuit 1).
Line 6 impedance (Driver's front airbag circuit 2).
Line 7 impedance (Driver's side curtain side airbag circuit).
Line 8 impedance (Passenger's side curtain side airbag circuit).
Line 9 impedance (Driver's front frontal side airbag circuit).
Line 10 impedance (Passenger's front frontal side airbag circuit).
Line 11 impedance (Driver's rear frontal side airbag circuit).
Line 12 impedance (Passenger's rear frontal side airbag circuit).
Line 13 impedance (Front belt pretensioners circuit).
Line 14 impedance (Rear retractors).
Number of memory zone deletions
Airbag lock circuit impedance
ACU4 Vdiag04 J84 1.0
MR-372-J84-88C000$080.mif

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Conformity check
88C - 67
88C
V3 MR-372-J84-88C000$090.mif
AIRBAG ACU4
Vdiag: 04
AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Conformity check
NOTESOnly carry out conformity check after a full check using the diagnostic tool.
Order FunctionParameter or State
Check or Action Display
and notesFault finding
1Diagnostic tool
dialogue- CHART 1Airbag ACU 4
2Computer
conformityParameter PR002 "Vehicle
type"DF001 MEGANE II:48
3Computer
configurationUsing "READ
CONFIGURATION" commandsEnsure that the computer
configuration defined in the
"Current" column
corresponds to the vehicle
equipment.None
4Warning light
operation
Computer
initialisation
check.Ignition switched onWarning light comes on for
3 seconds when the ignition
is switched onNone
ACU4 Vdiag04 J84 1.0
MR-372-J84-88C000$090.mif