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

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Introduction
88C - 2
88C
V3 MR-372-J84-88C000$010.mif
188C
AIRBAG ACU4
Vdiag: 04
AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Introduction
1. SCOPE OF THIS DOCUMENT
This document presents the fault finding method applicable to all computers with the following specifications:
2. PREREQUISITES FOR FAULT FINDING
Documentation type
Fault finding procedures (this manual):
– Assisted fault finding (incorporated into the diagnostic tool), paper version (Workshop Repair Manual
or Technical Note) and Dialogys.
Wiring Diagrams:
– Visu-Diagram (CD-ROM), paper.
Type of diagnostic tools:
–CLIP
Special tooling required:Véhicule: SCENIC II
Function concerned: AIRBAGName of computer: AUTOLIV - ACU 4
Program no.:
Vdiag No.: 04
SPECIAL TOOLING REQUIRED
– Multimeter.
– Set of adapters and terminal blocks for using the airbag and
pretensioner wiring harness check function of CLIP and XRBAG
tools for updates including the terminal blocks listed below.
– Modifying the series of new airbag ignition module
connectors entails modifying the dummy ignition module.
LOCAL MODIFICATION OF THE DUMMY IGNITION MODULE:
–Remove the ignition module from its red mounting and
remove one of the brown locking notches.
– 22-track computer terminal block: Elé. 1685
– 64-track computer terminal block: Elé. 1717
– 22-track seat terminal block: Elé. 1687
– 10-track rotary switch terminal block: Elé. 1617
ACU4 Vdiag04 J84 1.0
MR-372-J84-88C000$010.mif

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 - Introduction
88C - 8
88C
V3 MR-372-J84-88C000$010.mif
AIRBAG ACU4
Vdiag: 04
DEFINITION OF THE TRIGGER LINES
L1:Driver's seat cushion / frontal airbag circuit (cable B of 64-track terminal block Elé. 1717)
L2:Passenger's seat cushion / frontal airbag circuit (cable D of 64-track terminal block Elé. 1717)
L3:Passenger's frontal airbag circuit 1 (cable B of 22-track terminal block Elé. 1685)
L4:Passenger's frontal airbag circuit 2 (cable A of 22-track terminal block Elé. 1685)
L5:Driver's frontal airbag circuit 1 (cable C of 22-track terminal block Elé. 1685)
L6:Driver's frontal airbag circuit 2 (cable D of 22-track terminal block Elé. 1685)
L7:Driver's side curtain airbag circuit (cable I of 64-track terminal block Elé. 1717)
L8:Passenger's side curtain airbag circuit (cable G of 64-track terminal block Elé. 1717)
L9:Driver's front chest side airbag circuit (cable H of 64-track terminal block Elé. 1717
L10:Passenger's front chest side airbag circuit (cable F of 64-track terminal block Elé. 1717)
L11:Driver's rear chest side airbag circuit (cable N of 64-track terminal block Elé. 1717)
L12:Passenger's rear chest side airbag circuit (cable L of 64-track terminal block Elé. 1717)
L13:Front buckles pretensioner circuit (cables A and C of 64-track terminal block Elé. 1717)
L14:Rear seat belt retractors (cables E and J of 64-track terminal block Elé. 1717)
ACU4 Vdiag04 J84 1.0

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

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Configuration and programming
88C - 15
88C
V3 MR-372-J84-88C000$050.mif
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 - 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-20
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF002
PRESENT
COMPUTER SUPPLY VOLTAGE
1.DEF: Micro-cut
2.DEF: Values beyond tolerance
NOTESSpecial notes: Use the 22-track adapter (Elé. 1685 when working on the computer
connector (cable 1).
Carry out the operations necessary to obtain the correct voltage supply to the computer: 10.5 V ± 0.1 < correct
voltage < 16 V ± 0.1.
– Check the battery charge.
– Check the charging circuit.
– Check the tightness and the condition of the battery terminals.
– Check the computer earth.
– Check the condition of the computer + locking connections.
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 - 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 - Interpretation of faults
88C-22
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF028
PRESENT
PASSENGER AIRBAG STATUS INDICATOR 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