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

88C-3
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V3
MRSZ AIRBAG
Vdiag: 04AIRBAGS AND PRETENSIONERS
Fault finding - Introduction88C
Faults
Consider the fault status, present or stored when the diagnostic tool is used after the + after ignition feed
(without operating the system components).
Present faults must be dealt with according to the procedure specified in the Interpretation of faults section.
For a stored fault, note the faults displayed and apply the Notes section.
If the fault is confirmed when the notes are applied, the fault is present. Deal with the fault
If the fault is not confirmed, check:
–the electrical lines which correspond to the fault,
–the connectors on these lines (corrosion, bent pins, etc.),
–the resistance of the component detected as faulty,
–the condition of the wires (melted or split insulation, wear).
Or use the fault finding to check the circuit of the faulty component.
Conformity check
The aim of the conformity check is to check statuses and parameters that do not produce a fault display on the
diagnostic tool when they are inconsistent. Therefore, this stage is used to:
–Run fault finding on faults that do not have a fault display, and which may correspond to a customer
complaint,
–To check that the system is operating correctly, and that there is no risk of a fault recurring after repairs.
–This section gives the fault finding procedures for statuses and parameters and the conditions for
checking them.
If a status is not behaving normally or a parameter is outside the permitted tolerance values, consult the
corresponding fault finding page.
Customer complaints - Fault finding chart
If the diagnostic tool check is in order, but the customer complaint is still present, the fault should be dealt with as a
customer complaint.
A summary of the overall procedure to follow is provided on the following page in the
form of a flow chart.

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

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88C
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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MRSZ AIRBAG
Vdiag: 04

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AIRBAGS AND PRETENSIONERS
Fault finding - Interpretation of faults
MRSZ AIRBAG
Vdiag: 04
88C
DF039
CONTINUED
2.DEF
NOTESNone.
Replace the driver's side sensor component code 1028 (see MR 411, Mechanical, 88C, Airbag and
pretensioners, Side impact sensor: Removal - Refitting).
1.DEF
4.DEF
NOTESNone.
This fault corresponds to an inconsistency between the computer configuration and the vehicle equipment
detected by the computer. The computer has detected the presence of a component additional to its
configuration.
Read configuration LC082 Driver's front side impact sensor under the heading Configuration reading.
Modify the computer configuration using command CF285 Driver's front side impact sensor to adjust it to the
vehicle's equipment level.
AFTER REPAIRClear the computer fault memory using command RZ001 "Fault memory". Switch
the ignition of f and then on again.
Repeat a check using the diagnostic tool and, if there are no faults (do not take the
DF034 "Computer locked'' into account), unlock the computer using the command
VP007 ''Unlock computer''.

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AIRBAGS AND PRETENSIONERS
Fault finding - Interpretation of faults
MRSZ AIRBAG
Vdiag: 04
88C
DF040
CONTINUED
2.DEF
NOTESNone.
Replace the passenger's side sensor component code 1029 (see MR 411, Mechanical, 88C, Airbag and
pretensioners, Side impact sensor: Removal - Refitting).
1.DEF
4.DEF
NOTESNone.
This fault corresponds to an inconsistency between the computer configuration and the vehicle equipment
detected by the computer. The computer has detected the presence of a component additional to its
configuration.
Read configuration LC083 Passenger's front side impact sensor under the heading Configuration reading.
Modify the computer configuration using command CF286 Passenger's front side impact sensor to adjust it to
the vehicle's equipment level.
AFTER REPAIRClear the computer fault memory using command RZ001 "Fault memory". Switch
the ignition of f and then on again.
Repeat a check using the diagnostic tool and, if there are no faults (do not take the
DF034 "Computer locked'' into account), unlock the computer using the command
VP007 ''Unlock computer''.

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AIRBAGS AND PRETENSIONERS
Fault finding - Interpretation of faults
MRSZ AIRBAG
Vdiag: 04
88C
DF263
PRESENT
NO ABS/ESP MULTIPLEX SIGNAL
1. DEF: No ABS multiplex signal
NOTESNone.
Carry out the fault finding procedure for the multiplex network.
Test the multiplex network and the ABS (see 88B, Multiplexing and 38C, Anti-lock braking system).
AFTER REPAIRNone.
ABGMRSZ_V04_DF263P