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

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Introduction
88C
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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
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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 - Configuration and programming
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AIRBAG ACU4
Vdiag: 04
AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Configuration and programming
CLEARING
RZ001: Fault memory.
This command is used to clear faults from the computer's memory.
CONFIGURATION / READ CONFIGURATION:
– To make it easier to configure airbag computerACU4, the fault-finding tool has five automatic
configuration commands for the trigger lines and sensors installed in the vehicles (BMXX, CMXX,
SMXX).
The commands in the table on the next page, however, are used to configure each system
component individually to adapt the computer configuration to the actual equipment in the
vehicle.
– The read-configuration commands (LCXXX) are used to display the current computer configuration
in relation to the trigger lines and sensors installed in the vehicle.
– The configuration commands (CFXXX) are used to adjust computer configuration to the equipment
actually installed in the vehicle.
– STANDARD CONFIGURATION COMMANDS:
–CF297: B/C NO SIDE AIRBAGS.
Vehicle types B, C WITH NO FRONT AND REAR FRONTAL SIDE AIRBAGS AND NO SIDE
CURTAIN AIRBAGS (SABLAT / SSABCS).
–CF298: B/C WITH FRONT FRONTAL + CURTAIN AIRBAGS.
Vehicle types B, C with FRONT FRONTAL SIDE AIRBAGS + SIDE CURTAIN AIRBAGS
(ABLAVI / SSABCS).
–CF299: B/C WITH FRONT/REAR FRONTAL + CURTAIN AIRBAGS.
Vehicle types B, C with FRONT AND REAR FRONTAL SIDE AIRBAGS + SIDE CURTAIN
AIRBAGS (ABLAT / SSABCS).
–CF300: VAN WITH CURTAIN AIRBAGS.
Three S vehicles (vans) equipped with CURTAIN SIDE AIRBAGS (ABLAT / SSABCS).
–CF301: VAN WITH NO CURTAIN AIRBAGS.
Three S vehicles (vans) WITHOUT CURTAIN SIDE AIRBAGS (ABLAVI / SSABCS).
Because of probably computer part number unification in the Parts Department, some sensors
or trigger lines may have to be deconfigured after using standard configuration commands. For
this, use the individual configuration commands for system components.
After configuration, check the display configuration screen to make sure that the information
entered is correct.
ACU4 Vdiag04 J84 1.0
MR-372-J84-88C000$050.mif

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Fault Interpretation
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AIRBAG ACU4
Vdiag: 04
DF210
CONTINUED 1
Check the connections of the 22-track connector under the seat (tracks 7 and 8). Repair if necessary.
Attach the 22-track (Elé. 1687) test adapter under the seat (point C1).
The CLIP or XRBAG tool absolutely must be used to measure the resistance in cable C.
Is the value obtained correct?
NO
YES
Check seat side seat connector connections again (tracks 8 and 7).
If the fault persists, the wiring is faulty between the 22-track seat connector and the
buckle pretensioner of the faulty seat (C1/C3).
Again check the connections of the seat connector (tracks 7 and 8) on the
passenger compartment wiring side and of the 64-track (driver seat tracks 1 and
2 or passenger seat tracks 37 and 38) connector.
If the fault persists, the wiring is faulty between the computer and the seat displaying
the fault (C0/C1). Replace the wiring if necessary.
AFTER REPAIRReconnect the computer and the buckle pretensioners then switch on the ignition
again.
Clear 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.
Destroy any pretensioners that have been replaced (tool Elé. 1287).
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Fault Interpretation
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AIRBAG ACU4
Vdiag: 04
DF210
CONTINUED 2
CC.0 - CC.1
NOTESNone.
Lock the computer.
Disconnect the computer and check the connector connections (tracks 1, 2, 37 and 38).
Attach 64-track adapter (Elé. 1717).
The CLIP or XRBAG tool absolutely must be used to measure the proper insulation for the type of fault in
adapter cable A.
If the value obtained is incorrect, the wiring is faulty between the computer and the driver's seat buckle
pretensioner ignition module (C0/C3). See interpretationA.
The CLIP or XRBAG tool absolutely must be used to measure the proper insulation for the type of fault in
adapter cable C.
If the value obtained is incorrect, the wiring is faulty between the computer and the passenger seat buckle
pretensioner (C0/C3). See interpretationA.
Check the connections of the 22-track connector under the seat (tracks 7 and 8). Repair if necessary.
Attach the 22-track (Elé. 1687) test adapter under the seat (point C1).
The CLIP or XRBAG absolutely must be used to measure the proper insulation for the type of fault in cable C.
Is the value obtained correct?
NO
YES
If the fault persists, the wiring is faulty between the 22-track seat connector and the
buckle pretensioner of the faulty seat (C1/C3).
Replace the wiring if necessary.
Faulty wiring between the computer and the seat displaying the fault (C0/C1).
Replace the wiring if necessary.
AFTER REPAIRReconnect the computer and the buckle pretensioners then switch on the ignition
again.
Clear 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.
Destroy any pretensioners that have been replaced (tool Elé. 1287).
ACU4 Vdiag04 J84 1.0

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