wiring 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
88C - 6V3 MR-372-J84-88C000$010.mif
AIRBAG ACU4
Vdiag: 04
SYSTEM CONFIGURATION DIAGRAM (FRONT section)
AR To rear wiring
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

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

To be read with the diagnostic tool (Identification screen):
FAULT FINDING LOG
System: Airbag and pretensionersPage 2 / 2
●Identification of the computer and parts replaced for the system
Part 1 part no.
Part 2 part no.
Part 3 part no.
Part 4 part no.
Part 5 part no.
Computer part no.
Supplier no.
Program no.
Software version
Calibration number
VDIAG
●Faults found with the diagnostic tool
Fault no. Present Stored Fault title Specification
●
System-specific information
Total vehicle mileage (kilometrage) when the customer's problem
occurred:
How often does it occur?
How long after the engine starts?
●Additional information
What factors led you to replace the
computer?
What other parts were replaced?
Other faulty functions?
CAN
Wiring harness
SeatsInstrument panel
Battery
OtherRotary switch
Fuse
Please specify:
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 - Interpretation of faults
88C-30
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF065
PRESENT
DRIVER'S SEAT POSITION SENSOR CIRCUIT
CO: Open circuit
CC.0: Short circuit to earth
CC.1: Short circuit to + 12 V
1.DEF: Below minimum threshold
2.DEF: Values outside the limits
NOTESPriorities when dealing with a number of faults: If DF065 is present with at least
one of faults DF077, DF210, DF232, or DF240, begin the fault finding by checking the
22-track under-seat connector.
Special notes: Use the 64-track adapter (Elé. 1717) when working on the computer
connector.
Lock the computer using the command on the diagnostic tool.
Fit the 64-track test adapter (Elé. 1717) and measure the resistance between track 9 and track 10,
with the seat in the forward position and in the back position.
In the forward position, the resistance should be approximately 400Ω (275 < Ξ < 545 Ω)
In the back position, the resistance should be approximately 100Ω (65 < Ξ < 145 Ω)
If the resistances are correct, check the connections of the 64-track computer connector.
Check the connections of the 22-track connector under the seat. Repair if necessary.
Fit the 22-track test adapter (Elé. 1687) and measure the resistance between tracks 3 and 4, with the seat in
the forward position and in the back position.
In the forward position, the resistance should be approximately:400Ω (275 < X < 545)
In the back position, the resistance should be approximately: 100Ω (65 < X < 145)
Are the values correct?
NO
YES
Check the connection and the condition of the sensor connectors.
Check the continuity and insulation of the connections between:
Bornier Track 3 Track 2 sensor connector
Bornier Track 4 Track 1 sensor connector
If the checks are correct, replace the seat position sensor.
Check the connections of the seat connector (tracks 3 and 4) again, as well as the
connections of the 64-track connector (tracks 9 and 10).
If the fault persists, the wiring is faulty between the computer and the driver's seat
(C0/C1).
Replace the wiring if necessary.
AFTER REPAIRReconnect the computer, the seat position sensor, and the under-seat connector, 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.
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Interpretation of faults
88C-31
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF066
PRESENT
PASSENGER REAR CHEST LEVEL SIDE AIRBAG CIRCUIT
CC: Short circuit
CO: Open circuit
CC.1: Short circuit to + 12 V
CC.0: Short circuit to earth
1.DEF: Configuration
NOTESIf 1.DEF, check and modify the computer configuration.
Special notes: never carry out measuring operations on trigger lines using any tool
other than CLIP or XRBAG.
Use the 64-track adapter (Elé. 1717) when working on the computer connector.
CO - CC
NOTESSpecial notes: correct the trigger line configuration if the
vehicle is not fitted with rear side airbags.
Lock the computer.
Switch off the ignition and check that the ignition module of the passenger's rear side chest-level airbag is
correctly connected.
Disconnect the ignition module from the passenger's rear side chest-level airbag and connect a dummy ignition
module to the ignition module connector.
Switch on the ignition and carry out a check using the diagnostic tool.
Replace the passenger's rear side chest-level airbag if the fault becomes stored (fault no longer declared
present).
Disconnect the 64-track computer connector and check the connector connections (tracks 57 and 58). Repair
if necessary.
Fit the 64-track test adapter (Elé. 1717) to the airbag wiring (point C0).
The CLIP or XRBAG tool must be used to measure the resistance on cable L. If the value obtained is incorrect,
the wiring between the computer connector and passenger rear chest-level side airbag (C0/C3) is faulty;
replace the wiring if necessary.
AFTER REPAIRReconnect the computer and the ignition module of the passenger's rear chest-level
side airbag module 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. When replacing the airbag module, do not forget to reconnect the earth
on the new one.
Destroy the passenger rear chest-level side airbag module if it has been replaced
(tool Elé. 1287).
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Interpretation of faults
88C-32
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF066
CONTINUED
CC.1 - CC.0
NOTESNone.
Lock the computer.
Disconnect the 64-track computer connector and check the connector connections (tracks 57 and 58). Repair
if necessary.
Fit the 64-track test adapter (Elé. 1717) to the airbag wiring (point C0).
The CLIP or XRBAG tool must be used to measure the appropriate insulation for the type of fault on cable L.
If the value obtained is incorrect, the wiring between the computer connector and passenger rear chest-level
side airbag (C0/C3) is faulty; replace the wiring if necessary.
AFTER REPAIRReconnect the computer and the ignition module of the passenger's rear chest-level
side airbag module 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. When replacing the airbag module, do not forget to reconnect the earth
on the new one.
Destroy the passenger rear chest-level side airbag module if it has been replaced
(tool Elé. 1287).
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Interpretation of faults
88C-33
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF067
PRESENT
DRIVER'S REAR CHEST LEVEL SIDE AIRBAG CIRCUIT
CC: Short circuit
CO: Open circuit
CC.1: Short circuit to + 12 V
CC.0: Short circuit to earth
1.DEF: Configuration
NOTESIf 1.DEF, check and modify the computer configuration.
Special notes: never carry out measuring operations on trigger lines using any tool
other than CLIP or XRBAG.
Use the 64-track adapter (Elé. 1717) when working on the computer connector.
CO - CC
NOTESSpecial notes: correct the trigger line configuration if the
vehicle is not fitted with rear side airbags.
Lock the computer.
Switch off the ignition and check that the ignition module of the driver's rear side chest-level airbag is correctly
connected.
Disconnect the ignition module from the driver's rear side chest-level airbag and connect a dummy ignition
module to the ignition module connector.
Switch on the ignition and carry out a check using the diagnostic tool.
Replace the driver's rear side chest-level airbag if the fault becomes stored (fault no longer declared present).
Disconnect the 64-track computer connector and check the connector connections (tracks 29 and 30). Repair
if necessary.
Fit the 64-track test adapter (Elé. 1717) to the airbag wiring (point C0).
The CLIP or XRBAG tool must be used to measure the resistance on cable N. If the value indicated is
incorrect, the wiring between the computer connector and driver's rear chest-level side airbag (C0/C3) is faulty;
replace the wiring if necessary.
AFTER REPAIRReconnect the computer and the ignition module of the driver's rear chest-level side
airbag module 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. When replacing the airbag module, do not forget to reconnect the earth
on the new one.
Destroy the driver's rear chest-level side airbag module if it has been replaced (tool
Elé. 1287).
ACU4 Vdiag04 J84 1.0