lock RENAULT TWINGO 2009 2.G Electrical Equipment - Airbags And Pretensioners Workshop Manual

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MRSZ AIRBAG
Vdiag: 04AIRBAGS AND PRETENSIONERS
Fault finding - Introduction88C
4. FAULT FINDING PROCEDURE (CONTINUED)
Wiring check
Fault finding problems:
Disconnecting the connectors and/or manipulating the wiring harness may temporarily remove the cause of a fault.
Electrical measurements of voltage, resistance and insulation are generally correct, especially if the fault is not
present when the analysis is made (stored fault).
Visual inspection:
Look for damage under the bonnet and in the passenger compartment.
Carefully check the fuses, insulators and wiring harness routing.
Look for signs of oxidation.
Tactile inspection:
While manipulating the wiring harness, use the diagnostic tool to note any change in fault status from stored to
present.
Make sure that the connectors are properly locked.
Apply light pressure to the connectors.
Twist the wiring harness.
If there is a change in status, try to locate the source of the fault.
Inspection of each component:
Disconnect the connectors and check the appearance of the clips and tabs, as well as their crimping (no crimping on
the insulating section).
Make sure that the clips and tabs are properly locked in the sockets.
Make sure that no clips or tabs have been dislodged during connection.
Check the clip contact pressure using an appropriate model of tab.
Resistance check:
Check the continuity of entire lines, then section by section.
Look for a short circuit to earth, to + 12 V or to another wire.
If a fault is detected, repair or replace the wiring harness.

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MRSZ AIRBAG
Vdiag: 04AIRBAGS AND PRETENSIONERS
Fault finding - Introduction88C
5. FAULT FINDING LOG
You will always be asked for this log:
●when requesting technical assistance from Techline,
●for approval requests when replacing parts for which approval is mandatory,
●to be attached to monitored parts for which reimbursement is requested. The log is needed for warranty
reimbursement, and enables better analysis of the parts removed
.
6. SAFETY INSTRUCTIONS
Safety rules must be observed during any work on a component to prevent any damage or injury:
Check the battery voltage to avoid incorrect operation of computer functions.
During work 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 trigger lines will be disabled).
The locked mode is indicated when the instrument panel warning light comes on.
If it is impossible to connect the diagnostic tool, switch off the ignition, remove the system power supply
fuse and wait at least 2 seconds for the discharge of the reserve power capacity.
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 Ω.
During the procedure, check that the computer feed voltage does not drop below 10 V.
Disconnect the battery before removing and refitting any pyrotechnic component (airbag module,
pretensioner or seat belt retractor).IMPORTANTIMPORTANT
Any fault on a complex system requires thorough fault finding with the appropriate tools. The
FAULT FINDING LOG, which should be completed during the procedure, enables you to keep
track of the procedure which is carried out. It is an essential document when consulting the
manufacturer.
IT IS THEREFORE ESSENTIAL THAT THE FAULT FINDING LOG
IS FILLED OUT EVERY TIME IT IS REQUESTED BY TECHLINE OR THE WARRANT RETURNS
DEPARTMENT.
IMPORTANT
Airbag and pretensioner destruction and scrapping is subject to national legislation.

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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.

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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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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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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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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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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

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AIRBAGS AND PRETENSIONERS
Fault finding - Fault summary table
Tool faultAssociated
DTCDiagnostic tool title
DF0019080 Computer
DF0029042 Computer feed voltage
DF0039007 Driver's frontal airbag circuit
DF0049005 Passenger's front airbag circuit
DF0289041 Passenger airbag status warning light circuit
DF034907E Computer locked
DF0399035 Driver's side sensor circuit
DF0409036 Passenger's side sensor circuit
DF0609050 Multiplex network
DF068900C Passenger's chest front side airbag circuit
DF069900A Passenger side curtain airbag circuit
DF0709009 Driver's side curtain airbag circuit.
DF077900B Driver's front side chest airbag circuit
DF0919034 Airbag locking switch circuit
DF1659040 Airbag fault warning light circuit
DF1839012 Driver's side front buckle pretensioner circuit
DF1849013 Passenger side front buckle pretensioner circuit
DF193907C Passenger airbag locking status change.
DF194907F Computer to be replaced following impact
DF2329051 Driver's seat belt buckle sensor circuit
DF242907B Left-hand/right-hand drive configuration
DF2629050 Vehicle speed multiplex signal
DF2639050 No ABS/ESP multiplex signal
DF2649050 No instrument panel multiplex signal
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AIRBAGS AND PRETENSIONERS
Fault finding - Interpretation of faults
DF001
PRESENT
COMPUTER
NOTESSpecial note:
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.
Replace the airbag computer (see replacement of components).
AFTER REPAIRClear the computer fault memory. Switch off the ignition.
Carry out the check again using the diagnostic tool and, if there is no fault, unlock the
computer.
ABGMRSZ_V04_DF001P
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MRSZ AIRBAG
Vdiag: 04