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

88C-5
MR-413-X44-88C000$077.mif
V3
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.

88C-21
MR-413-X44-88C000$539.mif
V3
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
MR-413-X44-88C000$539.mif
MRSZ AIRBAG
Vdiag: 04

88C-59
MR-413-X44-88C000$616.mif
V3
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

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V3
88C
AIRBAGS AND PRETENSIONERS
Fault finding - Customer complaints
NOTESOnly refer to the customer complaints after performing a complete check using
the diagnostic tool.
ABSENCE OF DIALOGUE WITH THE AIR BAG COMPUTER ALP 1
MR-413-X44-88C000$847.mif
MRSZ AIRBAG
Vdiag: 04

88C-66
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V3
88C
AIRBAGS AND PRETENSIONERS
Fault finding - Fault Finding Chart
ALP 1 No communication with the airbag computer
NOTESSpecial note:
See "Introduction" for the + after ignition feed to perform fault finding on a
computer.
Use the W iring Diagrams Technical Note, New TWINGO.
Try to establish dialogue with a computer on another vehicle to make sure that the diagnostic tool is not faulty. If
the tool is not the cause and communication cannot be established with any other computer on the same vehicle,
it is possible that another computer is disrupting the multiplex network.
Proceed by successive disconnections to locate the defective computer. Check the battery voltage and perform
the necessary operations to reach the correct voltage.
(10.5 V < battery voltage < 16 V).
Check for the presence and condition of the supply fuse (F7 15A) of the airbag computer component code 756
on the passenger compartment fuse box component code 1016.
Check the connection of the airbag computer connector, component code 756 and the condition of its
connections.
If the connector is faulty and there is a repair procedure (see Technical Note 6015A, Repairing electrical
wiring, W iring: Precautions for repair), repair the connector, otherwise replace the wiring.
Check that the airbag computer, component code 756, is correctly supplied:
–Check and ensure the presence of + after ignition feed between the terminals marked earth connection
code NAP and + after ignition feed connection code AP25.
If the + after ignition feed is absent:
Check the insulation against earth and the continuity of the following connection:
–Connection code AP25 between components 1016 and 756.
Check the continuity of the following connection:
–Connection code NAP between component 756 and the earth NAP.
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Repairing
electrical wiring, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
AFTER REPAIRWhen communication is established, deal with any faults indicated.
ABGAB9_V04_ALP01
MR-413-X44-88C000$924.mif
MRSZ AIRBAG
Vdiag: 04

88C-67
MR-413-X44-88C000$924.mif
V3
AIRBAGS AND PRETENSIONERS
Fault finding - Fault Finding Chart
MRSZ AIRBAG
Vdiag: 04
88C
ALP 1
CONTINUED
Check that the power supply to the diagnostic socket is correct:
–+ before ignition feed on connection code BP19,
If the + before ignition feed is absent:
Check the insulation against earth and the continuity of the following connection:
–Connection code BP19 between components 225 and 1016.
–Earth on connections NAM and MAM.
If the earth is absent:
Check the continuity of the following connection(s):
–Connection code NAM between component 225 and earth NAM.
–Connection code MAM between component 225 and earth MAM.
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Repairing
electrical wiring, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
If dialogue has still not been established after these checks, contact the Techline.
AFTER REPAIRWhen communication is established, deal with any faults indicated.