2009 RENAULT TWINGO airbag off

88C-2
MR-413-X44-88C000$077.mif
V3
88C
AIRBAGS AND PRETENSIONERS
Fault finding - Introduction
1. SCOPE OF THIS DOCUMENT
This document presents the fault finding procedure applicable to all computers with the following specifications:
2. PREREQUISITES FOR FAULT FINDING
Documentation type
Fault finding procedures (this manual):
–Assisted fault finding (integrated into the diagnostic tool), Dialogys.
Wiring Diagrams:
–Visu-Schéma (CD-ROM), paper.
Type of diagnostic tools
–CLIP
Special tooling required
3. REMINDERS
To run fault finding on the vehicle computers, switch on the ignition. Proceed as follows:
–turn the ignition key to APC,
–connect the diagnostic tool and perform the required operations.
To cut off the + after ignition feed, proceed as follows:
–disconnect the diagnostic tool,
–turn the ignition key to OFF,
–verify that the forced + after ignition feed has been switched off by checking that the computer warning lights on
the control panel have gone out. Vehicle (s): New TWINGO
Function concerned: AIRBAGName of computer: TEMIC MRSZ
Vdiag No.: 04
Special tooling required
Multimeter
–Dummy module (Part no. Elé. 1835 yellow)
–Dummy module (Part no. Elé. 1837 - 2)
–Dummy module (Part no. Elé. 1837 - 5)
–Dummy module (Part no. Elé. 1837 - 6)
ABGMRSZ_V04_PRELI
MR-413-X44-88C000$077.mif
MRSZ AIRBAG
Vdiag: 04

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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 - 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
MR-413-X44-88C000$308.mif
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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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.
MR-413-X44-88C000$385.mif
MRSZ AIRBAG
Vdiag: 04

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88C
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
MR-413-X44-88C000$616.mif
MRSZ AIRBAG
Vdiag: 04

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AIRBAGS AND PRETENSIONERS
Fault finding - Interpretation of faults
MRSZ AIRBAG
Vdiag: 04
88C
DF002
PRESENT
COMPUTER SUPPLY VOLTAGE
1.DEF: Supply voltage too high
2.DEF: Supply voltage too low
NOTESUse the Wiring Diagrams Technical Note, New TWINGO.
Check the condition of the airbag computer connector component code 756 (see Wiring Diagram Technical
Note, New Twingo, Component code 756 and Technical Note 6015A, Repairing electrical wiring, Wiring:
Precautions for repair).
If the connector is faulty and there is a repair method (see Technical Note 6015A, Repairing electrical wiring,
Wiring: Precautions for repair), repair the connector, otherwise replace the wiring.
Check fuse F7 15 A on the passenger compartment fuse box, component code 1016.
With the ignition on, check for + 12 V on connection AP25 of the airbag computer, component code 756:
10.5 V ± 0.1 < voltage OK < 16 V ± 0.1.
If there is a repair method (see Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions for
repair), repair the wiring, otherwise replace it.
–Check the battery charge.
–Check the charge circuit (see 80A, Battery).
–Check the tightness and the condition of the battery terminals.
–Check the computer earth connection NAP.
Use the universal bornier to check the insulation and continuity of the following connections:
–Connection code AP25 between components 756 and 1016,
–Connection code NAP on component 756.
If there is a repair method (see Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions for
repair), repair the wiring, otherwise replace it.
If the fault is still present, contact the Techline.
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_DF002P