RENAULT TWINGO RS 2009 2.G Electrical Equipment - Airbags And Pretensioners User Guide

88C-11
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V3
MRSZ AIRBAG
Vdiag: 04AIRBAGS AND PRETENSIONERS
Fault finding - List and location of components88C
Version: 4 trigger lines

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MRSZ AIRBAG
Vdiag: 04AIRBAGS AND PRETENSIONERS
Fault finding - List and location of components88C
Version: 4 trigger lines (continued)
Number Description
1Driver's frontal airbag
2Passenger frontal airbag
3Lap belt pyrotechnic pretensioner (passenger or driver)
4Airbag computer
5Driver's seat belt buckle sensor
6Sensor for front passenger airbag inhibition by key
7Instrument panel
8Information to other systems (transmission via CAN)
(*) Component which can be deactivated by key (according to fault finding configuration)

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MRSZ AIRBAG
Vdiag: 04AIRBAGS AND PRETENSIONERS
Fault finding - List and location of components88C
1 - "Airbag Off" warning light:
The "airbag off" warning light is representative of the passenger airbag and passenger chest airbag inhibition status
if fitted.
–"off" = passenger airbag (switch on "ON") and passenger chest airbag (if fitted) active,
–"on" = passenger airbag (switch on "OFF" or fault detected on the switch line) and passenger chest
airbag (if fitted) inactive.
The "Airbag Fault" warning light comes on under the following conditions:
–detection and registering of an airbag system fault,
–a crash has been detected and registered,
–the computer is "crash locked" by the diagnostic tool,
–the computer must be programmed or reprogrammed.
2 - Passenger airbag inhibitor:
The passenger airbag inhibitor (by key) informs the airbag computer of a request to inhibit the passenger front airbag
and passenger chest airbag, if fitted.
3 - Driver's seat belt buckle sensor:
The seat belt buckle sensor gives the airbag computer the signal of whether the driver's belt is fastened or not.
4 - The driver and passenger buckle pyrotechnic pretensioners:
The buckle pyrotechnic pretensioner is integrated into the front seat belt buckle.
The pretensioner holds the occupant in the seat in the event of a crash.
5 - The driver and passenger rear seat belt pyrotechnic retractors:
The rear seat belt pyrotechnic retractor is integrated into the rear seat belt inertia reel.
The pyrotechnic seat belt retractor holds the occupant in the seat in the event of a crash.

88C-14
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88C
AIRBAGS AND PRETENSIONERS
Fault finding - Operating diagram
SYSTEM CONFIGURATION SHEET (FRONT section of the vehicle)
To rear wiring
Correct insulation value: display ≥ 100 h or 9999 flashing. A
B
C
D
E
GCentral unit
Driver’s seat
Front passenger seat (identical to the driver's
seat)
Front chest level side airbag ignition module
Driver's frontal airbag ignition module
Passenger's frontal airbag ignition moduleH
CT
PFront buckle pretensioner
Rotary switch + 12 V/Earth
Warning light / Diagnostic lines
Impact sensors/Impact signal
Passenger airbag locking switch/...
FRONT AIRBAGS
Measuring point Correct value
Driver C0, C2 and C4 1.2 to 5.8 Ω
Passenger C0 and C4 1.2 to 5.8 Ω
SIDE AIRBAGS AND PRETENSIONERS
Measuring point Correct value
C0, C1 and C3 1.2 to 5.8 Ω
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MRSZ AIRBAG
Vdiag: 04

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MRSZ AIRBAG
Vdiag: 04AIRBAGS AND PRETENSIONERS
Fault finding - Operating diagram88C
SYSTEM CONFIGURATION SHEET (REAR section of the vehicle)
Correct insulation value: display ≥ 100 h or 9999 flashing. ACentral unit
K/LCurtain airbag ignition modules
M/NRear pyrotechnic seat belt retractors
SIDE AIRBAGS AND SEAT BELT RETRACTORS- PRETENSIONERS
Measuring point Correct value
C0, C1 and C3 1.2 to 5.8 Ω

88C-16
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88C
AIRBAGS AND PRETENSIONERS
Fault finding - Function
The MRSZ airbag computer takes control of all of the vehicle's restraint devices intended to ensure the protection of
the occupants (driver, front and rear passengers).
The MRSZ computer is designed to carry out the following functions:
●detection and confirmation of longitudinal impacts (front or rear) and/or side impacts,
●corresponding activation of the pyrotechnic restraint devices (e.g.: pretensioner, airbag),
●management of the different signals relating to the characteristics of the occupants (e.g.: presence detection),
●management of the function inhibiting the trigger lines and the passenger sensor,
●management and surveillance of the instrument panel "Airbag Fault" and "Airbag Off" warning lights via the
CAN network,
●activation of the "Crash output" signal via the CAN in the event of a crash,
●management of the fault finding signals (signals provided by the fault manager in response to fault finding
requests, whether this consists of internal faults or input/output fault finding).
Special notes:
–Frontal impacts:
This function is carried out using the MRSZ accelerometer. Accelerometers measure the violence of the impact. The
vehicle speed, the position of the passenger airbag locking switch and the accelerometer measurements determine
the strategy that the computer adopts to trigger the ignition modules. The front seat belt buckle pretensioners and
the front airbag may also be triggered or not depending on the input parameters.
–Side impacts:
This function is carried out by the MRSZ computer and the side impact sensors, if fitted.
The position of the passenger airbag locking switch and the accelerometer measurements determine the strategy
that the computer adopts to trigger the ignition modules. The front buckle pretensioners and the front chest-level
airbags and curtain airbags may also be triggered or not.
–Inhibition of passenger trigger lines:
This function is managed by the airbag computer, according to the position of the passenger airbag inhibition switch
and depending on the vehicle context.
The change in status of the inhibition switch must be done outside of after ignition feed. A change in status of the
switch is, however, authorised for 10 seconds after the after ignition feed for the vehicle is switched on.
If a change is status occurs outside of this 10 seconds, the computer will register a fault.
Inhibition programming:
–Trigger lines inhibited and "Airbag Off" warning light lit if switch is on "OFF" 100 Ω.
–Trigger lines authorised if the switch is on "ON" 400 Ω.
–Trigger lines inhibited, "Airbag Fault" and "Airbag Off" warning lights lit if a fault is detected, if the switch is not
configured and detected as present, or if there is a change of position outside of the conditions
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MRSZ AIRBAG
Vdiag: 04

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MRSZ AIRBAG
Vdiag: 04AIRBAGS AND PRETENSIONERS
Fault finding - Function88C
By default, when the key is in the inhibition position, the following protections and signals are inhibited in the event of
a crash:
–Passenger front air bag.
–Passenger chest-level airbag, if fitted.
The passenger front airbag and passenger chest-level airbag are inhibited when the locking switch is
positioned on OFF or when DF028 "PASSENGER AIRBAG STATUS INDICATOR LIGHT CIRCUIT" or DF193
"PASSENGER AIRBAG LOCKING STATUS CHANGE" is present in the computer memory.
–Seat belt locking monitoring:
This function is carried out by the instrument panel (seat belt reminder indicator light and buzzer). The MRSZ
computer only sends the driver's seat belt buckle sensor status.
An instrument panel warning light indicates that the seat belt is not being worn by the driver and a beep sounds as a
reminder when the vehicle speed exceeds 12 mph (20 km/h).
–Monitoring the information displayed on the instrument panel:
The instrument panel controls the correct operation of the "Airbag fault" and "Airbag OFF" warning lights and
informs the airbag computer, via the multiplex network, of any possible malfunctions in the warning light circuits.

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88C
AIRBAGS AND PRETENSIONERS
Fault finding - Replacement of components
REPLACING A SYSTEM COMPONENT
Disconnect the battery before removing and refitting any pyrotechnic component (airbag module,
pretensioner or seat belt retractor).
The computer must always be locked before any operation on a system component.
REPLACING THE AIRBAG COMPUTER
BEFORE REPLACING THE COMPUTER IT IS ESSENTIAL THAT YOU CONTACT THE TECHLINE.
To ensure that the returned computer's fault can be analysed, do not use command RZ001 "FAULT
MEMORY" when DF001 "COMPUTER" is present or stored.
The airbag computers are sold in locked mode to avoid all risk of accidental triggering (all trigger lines are inhibited).
The "locked" mode is indicated when the airbag fault warning light on the instrument panel lights up.
Follow this procedure to replace an airbag computer:
–check that the ignition is switched off,
–replace the computer,
–modify the computer configuration if necessary,
–enter the VIN into the computer with the diagnostic tool using command VP010 "WRITE VIN",
–switch off the ignition,
–carry out a check using the diagnostic tool,
–unlock the computer with command VP007 "UNLOCK COMPUTER", only if there are no faults indicated by the
diagnostic tool and check that the indicator light has gone out.
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MRSZ AIRBAG
Vdiag: 04

88C-19
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88C
AIRBAGS AND PRETENSIONERS
Fault finding - Configurations and programming
CONFIGURATIONS/CONFIGURATION READING
The commands allow each component of the system to be configured separately to adapt the computer
configuration to the vehicle's actual equipment.
–Configuration reading commands (LCxxx), are used to check the status of the computer configuration in
relation to the trigger lines and vehicle sensors.
–Configuration commands (CFxxx), are used to adapt the computer configuration to the actual vehicle
fittings.
CONFIGURABLE FEATURES:
Trigger lines "WITH" or "WITHOUT"
Sensors "WITH or "WITHOUT"Diagnostic tool titleConfiguration
readingConfiguration
Passenger frontal airbag
Driver's frontal airbag
Driver's side curtain air bag
Passenger's side curtain air bag
Driver's front chest side air bag
Passenger front chest side air bag
Driver's front buckle pretensioner
Passenger front buckle pretensionerLC028
LC027
LC040
LC041
LC042
LC043
LC064
LC065CF210
CF209
CF221
CF222
CF223
CF224
CF265
CF266
Diagnostic tool titleConfiguration
readingConfiguration
Driver's front side impact sensor
Passenger front side impact sensor
Driver's seat belt buckle sensorLC082
LC083
LC073CF285
CF286
CF273
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MRSZ AIRBAG
Vdiag: 04

88C-20
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MRSZ AIRBAG
Vdiag: 04AIRBAGS AND PRETENSIONERS
Fault finding - Configurations and programming88C
CONFIGURATIONS/CONFIGURATION READINGS (continued)
Passenger airbag locking mode "BY KEY" or "WITHOUT"
Vehicle type reading: LC034 "VEHICLE TYPE" (New Twingo)
OTHER COMMANDS
–VP006: LOCK COMPUTER
This command should be used for any operation on the system. It permits inhibition of all trigger lines.
–VP007: UNLOCK COMPUTER
This command is used to unlock the computer when it is new or has been inhibited by command
VP006.
–VP010: WRITE VIN
This command is used to enter the VIN number into the computer.
–SC004: READ IMPACT CONTEXTS
Use this command during repair of the vehicle following an impact. The command enables the list of
trigger lines active and the system status upon impact to be accessed in the computer which is being
replaced.
CLEARING
–RZ001: FAULT MEMORY
This command is used for clearing the stored faults from the computer.Diagnostic tool titleConfiguration
readingConfiguration
Passenger airbag locking modeLC060 CF248