air condition 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
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
Check the battery charge and
condition of the fuses
Print the system fault finding log
(available on CLIP and in the
Workshop Repair Manual or
Technical Note)
Connect CLIP
no
Dialogue with
computer?
yes
Read the faults
no
Faults
present
yes
Deal with present faults
Deal with stored faults
no
The cause is
still presentFault
solved
yes
See ALP no. 1
Conformity check
no
The cause is
still presentFault
solved
Use fault finding charts
(ALPs)
no
The cause is
still presentFault
solved
Contact the Techline with the
completed fault finding log

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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
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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
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

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AIRBAGS AND PRETENSIONERS
Fault finding - Interpretation of faults
MRSZ AIRBAG
Vdiag: 04
88C
DF003
PRESENT
DRIVER'S FRONT AIRBAG CIRCUIT
CO : Open circuit
CC : Short circuit
CC.0 : Short circuit to earth
CC.1 : Short circuit to 12 volts
1.DEF : Configuration
2.DEF : Short circuit between trigger lines
NOTESIf 1.DEF, check the computer configuration using configuration reading LC028
Driver's front airbag, then modify it if it is inconsistent using the configuration CF209
Driver's front airbag.
IMPORTANT
Before disconnecting the airbag connector to fit a dummy module, always lock
the trigger lines using the diagnostic tool and command VP006 "Lock
computer".
Special note:
Use dummy module (part no. Elé. 1837- 5) and dummy module (part no. Elé. 1835
yellow).
Use the W iring Diagrams Technical Note, New TWINGO.
Lock the trigger lines using command VP006 Lock computer.
Switch off the ignition.
Remove the driver's airbag, component code 899 (see MR 411, Mechanical, 88C, Airbag and pretensioners,
Driver's front airbag: Removal - Refitting).
Check the condition of the driver's front airbag connector (see Wiring Diagram Technical Note, New Twingo,
Component code 899 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.
Fit the dummy module (part no. Elé. 1835 yellow) on the driver's front airbag connector, component code 899.
Switch on the ignition again.
Read the fault in the AIRBAG / PRETENSIONER field.
If the fault has become "Stored":
Replace the driver's front airbag component code 899.
If the fault remains "Present":
Switch off the ignition.
Check the condition of the rotary switch connector, component code 689 (see Wiring Diagram Technical Note,
New Twingo, Component code 689, Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions for
repair and MR 411, Mechanical, 84A, Controls-Signals, Steering column switch assembly: Removal-Refitting).
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.
Position the dummy module (part no. Elé. 1837 - 5) on the rotary switch connector component code 689.
Switch on the ignition again.
Read the fault in the AIRBAG / PRETENSIONER field.
AFTER REPAIRClear the computer fault memory using command RZ001 "Fault memory". Switch
the ignition of f and then on again.
Repeat the check using the diagnostic tool and, if there are no faults (ignore DF034
Computer locked), unlock the computer using command VP007 Unlock computer.
ABGMRSZ_V04_DF003P

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AIRBAGS AND PRETENSIONERS
Fault finding - Interpretation of faults
MRSZ AIRBAG
Vdiag: 04
88C
DF003
CONTINUED
If the fault remains "Present":
Check the condition of the airbag computer connector, component code 756 (see Wiring Diagram Technical
Note, New Twingo, Component code 756, see MR 411, Mechanical, 88C, Airbag and pretensioners, Airbag
computer: Removal - Refitting 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.
Faulty wiring between the airbag computer component code 756 and the rotary switch component code 689.
Check the insulation (+ 12 V, to earth and between the 2 lines) and the continuity of the following
connections:
–Connection code 60AM between components 756 and 689,
–Connection code 60AN between components 756 and 689.
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 has become "Stored":
Replace the rotary switch component code 689 (see MR 411, Mechanical, 84A, Controls - Signals, Steering
column switch assembly: Removal - Refitting).
If the fault is still present, contact the Techline.
AFTER REPAIRClear the computer fault memory using command RZ001 "Fault memory". Switch
the ignition of f and then on again.
Repeat the check using the diagnostic tool and, if there are no faults (ignore DF034
Computer locked), unlock the computer using command VP007 Unlock computer.

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AIRBAGS AND PRETENSIONERS
Fault finding - Interpretation of faults
MRSZ AIRBAG
Vdiag: 04
88C
DF004
PRESENT
PASSENGER FRONT AIRBAG CIRCUIT
CO : Open circuit
CC : Short circuit
CC.0 : Short circuit to earth
CC.1 : Short circuit to 12 volts
1.DEF : Configuration
2.DEF : Short circuit between trigger lines
NOTESIf 1.DEF, check the computer configuration using the configuration reading LC027
Passenger's front airbag, then modify it if it is inconsistent using the configuration
CF210 Driver's front airbag.
IMPORTANT
Before disconnecting the airbag connector to fit a dummy module, always lock
the trigger lines using the diagnostic tool and command VP006 "Lock
computer".
Special note:
Use dummy module (Part no. Elé.1835 yellow).
Use the W iring Diagrams Technical Note, New TWINGO.
Lock the trigger lines using the command VP006 Lock computer.
Switch off the ignition.
Remove the passenger's airbag, component code 861 (see MR 411, Mechanical, 88C, Airbag and
pretensioners, Passenger's front airbag: Removal - Refitting).
Check the condition of the passenger's front airbag connector, component code 861 (see Wiring Diagram
Technical Note, New Twingo, Component code 861 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.
Position the dummy module (part no. Elé. 1835 yellow) on the passenger's front airbag connector component
code 861.
Switch on the ignition again.
Read the fault in the AIRBAG / PRETENSIONER field.
AFTER REPAIRClear the computer fault memory using command RZ001 Fault memory. Switch the
ignition off and then on again.
Repeat the check using the diagnostic tool and, if there are no faults (ignore DF034
Computer locked), unlock the computer using command VP007 Unlock computer.
ABGMRSZ_V04_DF004P

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AIRBAGS AND PRETENSIONERS
Fault finding - Interpretation of faults
MRSZ AIRBAG
Vdiag: 04
88C
DF004
CONTINUED
If the fault remains "Present":
Check the condition of the airbag computer connector, component code 756 (see Wiring Diagram Technical
Note, New Twingo, Component code 756, Technical Note 6015A, Repairing electrical wiring, Wiring:
Precautions for repair and MR 411, Mechanical, 88C, Airbag and pretensioners, Airbag computer:
Removal - Refitting).
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.
Faulty wiring between the airbag computer component code 756 and the passenger front airbag component
code 861.
Check the insulation (+ 12 V, to earth and between the 2 lines) and the continuity of the following
connections:
–Connection code 60H between components 756 and 861,
–Connection code 60K between components 756 and 861.
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 has become "Stored":
Replace the passenger's front airbag component code 861 (see MR 411, Mechanical, 88C, Airbag and
pretensioners, Passenger's front airbag: Removal - Refitting).
If the fault is still present, contact the Techline.
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
DF039
PRESENT
DRIVER'S SIDE SENSOR CIRCUIT
CC.1 : Short circuit to 12 volts
CC.0 : Short circuit to earth
1. DEF : Configuration
2. DEF : Sensor internal electronic fault
3. DEF : No communication
4. DEF : Consistent
CC.1, CC.0,
3.DEF
NOTESUse the Wiring Diagrams Technical Note, New TWINGO.
Lock the computer using command VP006 Lock computer.
Check the condition of the driver's side sensor connector, component code 1028 (see Wiring Diagrams
Technical Note, New Twingo, Component code 1028 and MR 411, Mechanical, 88C, Airbag and
pretensioners, Side impact sensor: Removal - Refitting).
Check the condition of the airbag computer connector, component code 756 (see Wiring Diagram Technical
Note, New Twingo, Component code 756 and MR 411, Mechanical 88C, Airbag and pretensioners, Airbag
computer: Removal - Refitting).
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.
Use the "Universal bornier" to check the insulation to + 12 V, to earth and between the 2 lines of the following
connections:
–Connection code 60AH between components 756 and 1028,
–Connection code 60AG between components 756 and 1028.
If there is a repair method (see Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions for
repair), repair the wiring, otherwise replace it.
Use the "universal bornier" to check the continuity of the following connections:
–Connection code 60AH between components 756 and 1028,
–Connection code 60AG between components 756 and 1028.
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, replace the driver's side sensor component code 1028 (see MR 411, Mechanical, 88C,
Airbag and pretensioners, Side impact sensor: Removal - Refitting).
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''.
ABGMRSZ_V04_DF039P