2011 RENAULT SCENIC Air Bag ACU4 - Seat Belt Pretensioners Workshop Manual

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 - 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

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