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

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 - System operation
88C - 9
88C
V3 MR-372-J84-88C000$020.mif
AIRBAG ACU4
Vdiag: 04
AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - System operation
PASSIVE SAFETY EQUIPMENT
The MEGANE II has equipment also found on the LAGUNA II and VEL SATIS, namely:
– Front seat chest side airbag.
– Front seat type BXX double pretensioner.
– Driver's seat position sensor for adaptive airbag.
– Three-point rear centre seat belt.
– Front and rear Isofix mountings.
INNOVATIONS:
– Passenger airbag inhibition switch
– Anti-skid airbag in the seat along with a buckle pretensioner on the
front seat in type CMXX MEGANE II.
In the text, this airbag is referred to as the:
SEAT-CUSHION AIRBAG/DRIVER'S SEAT LAP BELT.
Via the same trigger line, the ACU 4 Vdiag 04 computer controls either the seat-cushion (anti-
skid) airbag or the driver's seat lap belt pretensioner:
The configuration for type B is: Driver's seat lap belt pretensioner.
The configuration for type C is: Driver's seat-cushion airbag.
Both features are never found on the same vehicle because they use the same ignition
line.
ACU4 Vdiag04 J84 1.0
MR-372-J84-88C000$020.mif

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Computer track allocation
88C - 10
88C
V3 MR-372-J84-88C000$030.mif
AIRBAG ACU4
Vdiag: 04
AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Computer track allocation
AIRBAG COMPUTER
22-track connector:
64-track connector:Track Description Track Description
1
2
3
4
5
6
7
8
9
10
11+ Passenger front airbag volume 2
+ Passenger front airbag volume 1
+ Driver's front airbag volume 1
+ Driver's front airbag volume 2
Not used
Not used
+ After ignition
Not used
Not used
CAN L
CAN H12
13
14
15
16
17
18
19
20
21
22- Passenger front airbag volume 2
- Passenger front airbag volume 1
- Driver's front airbag volume 1
- Driver's front airbag volume 2
Not used
Not used
Electrical earth
Not used
Not used
+ Passenger airbag inhibition switch
+ Passenger airbag inhibition switch
Track Description Track Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32+ Buckle pretensioner: driver
- Buckle pretensioner: driver
+ Lap belt pretensioner: driver
+ Lap belt pretensioner: driver
Not used
Not used
Not used
Not used
- Driver's seat position sensor
+ Driver's seat position sensor
+ Driver's seat belt buckle contact
- Driver's seat belt buckle contact
Not used
Not used
+ Driver's front chest side airbag
- Driver's front chest side airbag
+ Driver's side curtain airbag
+ Driver's side curtain airbag
+ Driver's rear seat belt retractor
- Driver's rear seat belt retractor
Not used
Not used
Not used
Not used
Not used
Not used
+ Driver's side lateral impact sensor
- Driver's side lateral impact sensor
+ Rear chest side airbag driver's side
- Rear chest side airbag driver's side
Not used
Not used33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64Not used
Not used
Not used
Not used
+ Buckle pretensioner: passenger
- Buckle pretensioner: passenger
+ Lap belt pretensioner: passenger
- Lap belt pretensioner: passenger
+ Rear passenger seat belt retractor
+ Rear passenger seat belt retractor
+ Passenger's front chest side airbag
- Passenger's front chest side airbag
+ Passenger side curtain airbag
-
Passenger side curtain airbag
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
+ Passenger's rear chest side airbag
- Passenger's rear chest side airbag
Not used
Not used
+ Passenger side lateral impact sensor
- Passenger side lateral impact sensor
Not used
Not used
ACU4 Vdiag04 J84 1.0
MR-372-J84-88C000$030.mif

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Computer track allocation
88C - 11
88C
V3 MR-372-J84-88C000$030.mif
AIRBAG ACU4
Vdiag: 04
SIDE IMPACT SENSORS CONNECTIONS
2-track connector
Track Description Track Description
1 Signal +2 Signal -
Note:
The front belt pretensioners, front chest side airbags, lap pretensioners or seat airbags and seat position
sensor functions run through a black 22-track R341 or R342 intermediate connector located under each seat
and attached to the vehicle floor.
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 - 13
88C
V3 MR-372-J84-88C000$050.mif
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 - Configuration and programming
88C - 14
88C
V3 MR-372-J84-88C000$050.mif
AIRBAG ACU4
Vdiag: 04
CONFIGURATION / READ CONFIGURATION:
– CONFIGURABLE FEATURES:
Trigger lines "WITH" or "WITHOUT":
The front buckle pretensioners are serially wired.
The rear seat belt retractors are serially wired.
Sensors "
WITH" or "WITHOUT":
TITLECONFIGURATION
READINGCONFIGURATION
SEAT-CUSHION AIRBAG/DRIVER'S SEAT LAP BELT.
PASSENGER'S SEAT-CUSHION AIRBAG / LAP BELT
PASSENGER FRONT AIRBAG CIRCUIT 1
PASSENGER FRONT AIRBAG CIRCUIT 2
DRIVER'S FRONT AIRBAG CIRCUIT 1
DRIVER'S FRONT AIRBAG CIRCUIT 2
DRIVER'S SIDE CURTAIN AIRBAG
PASSENGER SIDE CURTAIN AIRBAG
DRIVER'S FRONT CHEST SIDE AIRBAG
PASSENGER FRONT CHEST SIDE AIRBAG
DRIVER'S REAR CHEST SIDE AIRBAG
PASSENGER REAR CHEST SIDE AIRBAG
FRONT BUCKLE PRETENSIONERS
REAR INERTIA REELSLC080
LC079
LC052
LC047
LC048
LC049
LC040
LC041
LC042
LC043
LC044
LC045
LC081
LC078CF283
CF282
CF236
CF229
CF230
CF231
CF221
CF222
CF223
CF224
CF225
CF226
CF284
CF278
TITLECONFIGURATION
READINGCONFIGURATION
DRIVER'S SEAT POSITION SENSOR
DRIVER'S SIDE SENSOR
PASSENGER SIDE SENSOR
DRIVER'S SEAT BELT BUCKLE SENSORLC086
LC025
LC026
LC073CF289
CF207
CF208
CF273
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-24
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF039
PRESENT
DRIVER'S SIDE SENSOR CIRCUIT
CO: Open circuit
CC.0: Short circuit to earth
1.DEF: Communication disrupted
2.DEF: Sensor internal electrical fault
3.DEF: External diagnostics
NOTESSpecial notes: Use the 64-track adapter (Elé. 1717) when working on the computer
connector.
CO - CC.0 - 1.DEF
NOTESNone.
Lock the computer using the command on the diagnostic tool.
Check that the driver's side sensor is connected correctly and check its connections.
Check the condition of the connections on the computer (tracks 27 and 28).
Check the condition of the 64-track connector (locking system, connections, etc.).
Check the continuity and insulation of the connections between:
Bornier (Elé. 1717) terminal 27 Track 1 sensor connector
Bornier (Elé. 1717) terminal 28 Track 2 sensor connector
2.DEF - 3.DEF
NOTESIf the fault is still present, check whether the sensor fitted is
compatible with the airbag computer connected to the
vehicle. If not, order the sensor specifically for the airbag
fitted.
Replace the driver's side sensor.
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-25
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF040
PRESENT
PASSENGER SIDE SENSOR CIRCUIT
CO: Open circuit
CC.0: Short circuit to earth
1.DEF: Communication disrupted
2.DEF: Sensor internal electrical fault
3.DEF: External diagnostics
NOTESSpecial notes: Use the 64-track adapter (Elé. 1717) when working on the computer
connector.
CO - CC.0 - 1.DEF
NOTESNone.
Lock the computer using the command on the diagnostic tool.
Check that the driver's side sensor is connected correctly and check its connections.
Check the condition of the connections on the computer (tracks 61 and 62).
Check the condition of the 64-track connector (locking system, connections, etc.).
Check the continuity and insulation of the connections between:
Bornier (Elé. 1717) terminal 61 Track 1 sensor connector
Bornier (Elé. 1717) terminal 62 Track 2 sensor connector
2.DEF - 3.DEF
NOTESIf the fault is still present, check whether the sensor fitted is
compatible with the airbag computer connected to the
vehicle. If not, order the sensor specifically for the airbag
fitted.
Replace the passenger side sensor.
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