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

88C-3
MR-413-X44-88C000$077.mif
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.

88C-14
MR-413-X44-88C000$231.mif
V3
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
MR-413-X44-88C000$231.mif
MRSZ AIRBAG
Vdiag: 04

88C-15
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V3
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-17
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V3
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.

88C-61
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88C
AIRBAGS AND PRETENSIONERS
Fault finding - Conformity check
MAIN COMPUTER STATUSES AND PARAMETERS
NOTESOnly check the conformity after a complete check with the diagnostic tool. The
values shown in this conformity check are given as a guide.
Application conditions: Engine stopped, ignition on.
FunctionParameter or Status
checked or ActionDisplay and
notesFault finding
Main
computer
Statuses and
ParametersET073:Computer locked
by toolYES or NO
This status indicates whether or not
the computer is locked.In the event of a fault, apply the
interpretation for DF034
"Computer locked".
ET143:Passenger
airbag(s) lockedYES or NO
This status indicates the locking of
the passenger trigger lines
(passenger front airbag, passenger
chest-level airbag).In the event of a fault, apply the
interpretation of DF193
"Passenger airbag locking
status change".
ET076:Computer to be
replacedYES or NO
This status indicates whether the
computer should be replaced or not.In the event of a fault, apply the
interpretation of DF001
"Computer" and DF194
"Computer to be replaced
following impact".
ET010: Impact detectedYES or NO
This status indicates whether an
impact has been detected by the
computer.In the event of a fault, apply the
interpretation of DF194 "Computer
to be replaced following impact".
ET074:Fault warning
light activatedYES or NO
This status permits a check on the
request by the computer for the
"airbag fault" indicator light to be lit
or not.In the event of a fault, apply the
interpretation of DF165 "Airbag
fault warning light circuit".
ET072:Passenger airbag
status indicator
light commandedYES or NO
This status permits a check on the
request by the computer for the
"passenger airbag" indicator light
to be lit.In the event of a fault, apply the
interpretation of DF028
"Passenger airbag status
indicator light circuit".
PR001:Computer feed
voltageThis parameter indicates the
computer voltage.
The voltage should
be between:
9 V < X < 14 VIn the event of a fault, apply the
interpretation for DF038
"Computer".
ET169:Driver's seat belt
contactOPEN - CLOSED - FAULTY
This status is used to check whether
the driver buckle switch is working
properly.In the event of a fault, apply the
interpretation of DF232 "Driver's
seat belt buckle sensor circuit".
ABGMRSZ_V04_CCONF
MR-413-X44-88C000$693.mif
MRSZ AIRBAG
Vdiag: 04

88C-62
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MRSZ AIRBAG
Vdiag: 04AIRBAGS AND PRETENSIONERS
Fault finding - Conformity check88C
FUNCTION: AIRBAG
SUB-FUNCTION: TRIGGERING
NOTESOnly check the conformity after a complete check with the diagnostic tool. The
values shown in this conformity check are given as a guide.
Application conditions: Engine stopped, ignition on.
FunctionParameter or Status
checked or ActionDisplay and Notes Fault finding
TriggeringPR013:Driver's front airbag
resistance
The resistance should be
between:
1.2 Ω < X < 5.8 Ω
This value may be 99.9 Ω if
the vehicle is not fitted with
the airbag in question
(see vehicle equipment).
These parameters indicate
the impedance in ohms on
trigger lines.In the event of a fault, apply the
interpretation of DF003 "Driver's front
airbag circuit".
PR014:Passenger front
airbag resistanceIn the event of a fault, apply the
interpretation of DF004 "Passenger
front airbag circuit".
PR011:Driver's side airbag
resistanceIn the event of a fault, apply the
interpretation of DF077 "Driver's front
chest-level side airbag circuit"
.
PR012:Passenger side
airbag resistanceIn the event of a fault, apply the
interpretation of DF068 "Passenger
front chest-level side airbag circuit"
.
PR017:Driver's side
curtain airbag
resistanceIn the event of a fault, apply the
interpretation of DF070 "Driver's side
curtain airbag circuit".
PR018:Passenger side
curtain airbag
resistanceIn the event of a fault, apply the
interpretation of DF069 "Passenger
side curtain airbag circuit".
PR015:Driver’s
pretensioner
resistanceIn the event of a fault, apply the
interpretation of DF183 "Driver's
buckle pretensioner circuit"
.
PR016:Passenger
pretensioner
resistanceIn the event of a fault, apply the
interpretation of DF184 "Passenger
buckle pretensioner circuit"
.

88C-63
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V3
MRSZ AIRBAG
Vdiag: 04AIRBAGS AND PRETENSIONERS
Fault finding - Conformity check88C
FUNCTION: AIRBAG
SUB-FUNCTION: LOCK AIRBAGS
NOTESOnly check the conformity after a complete check with the diagnostic tool. The
values shown in this conformity check are given as a guide.
Application conditions: Engine stopped, ignition on.
FunctionParameter or Status
checked or ActionDisplay and
notesFault finding
Lock AirbagsET073:Computer locked
by toolYES or NO
This status indicates whether or
not the computer is locked.In the event of a fault, apply the
interpretation of DF034 "Computer
locked".
ET143:Passenger
airbag(s) lockedYES or NO
This status indicates the locking
of the passenger trigger lines
(passenger front airbag,
passenger chest-level airbag,
if fitted).In the event of a fault, apply the
interpretation of DF193 "Change of
passenger airbag locking status"
and DF091 "Airbag locking switch
circuit".
ET103:Type of
passenger airbag
lockingYES or NO
This status indicates the
inhibited trigger lines when the
passenger airbag is inhibited
(passenger front airbag,
passenger front chest-level
airbag, if fitted).In the event of a fault, apply the
interpretation of DF091 "Airbag
locking switch circuit " then DF193
"Change of passenger airbag
locking status".
ET169:Driver's seat belt
contactOPEN - CLOSED - FAULTY
This status is used to check
whether the driver buckle switch
is working properly.In the event of a fault, apply the
interpretation of DF232 "Driver's seat
belt buckle sensor circuit".
PR147:Airbag locking
circuit
impedance380 Ω +/- 40 Ω, this resistance
indicates that the passenger
airbag locking switch is "ON".
or
90 Ω +/- 10 Ω, this resistance
indicates that the passenger
airbag locking switch is "OFF"In the event of a fault, apply the
interpretation of DF091 "Airbag
locking switch circuit " then DF193
"Change of passenger airbag
locking status".