air condition RENAULT SCENIC 2011 J95 / 3.G Air Bag ACU4 - Seat Belt Pretensioners Workshop Manual

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Introduction
88C
88C - 3V3 MR-372-J84-88C000$010.mif
AIRBAG ACU4
Vdiag: 04
3. REMINDERS
Procedure:
To run diagnostics on the vehicle's computers, switch on the ignition in fault finding mode (+ after ignition forced
setting):
– vehicle card in card reader.
– Press and hold start button (longer than 5 seconds) with start-up conditions not fulfilled,
– Then connect the diagnostic tool and perform the required operations.
+ After ignition feed cut-out is performed as follows:
– Disconnect the diagnostic tool,
– Press the start button twice briefly (less then 3 seconds),
– See that the + after ignition feed has been cut off by checking that the computer warning lights on the instrument
panel have gone out.
Faults:
Faults are declared to be either present or stored (depending on whether they appeared in a certain situation and
have disappeared since, or whether they remain but are not diagnosed within the current context).
The present or stored state of faults should be taken into consideration when the diagnostic tool is used after the
+ after ignition feed (without acting on the system components).
Deal with present faults according to the procedure specified in the Interpretation of faults section.
For stored faults, note the faults displayed and follow the instructions in the "Notes" section.
If the fault is confirmed when the instructions in the Notes section are applied, the fault is present. In this case, deal
with the fault
If the fault is not confirmed, carry out basic checks. Check:
– the electrical lines which correspond to the fault,
– the connectors for these lines (for oxidation, bent pins, etc.),
– - the resistance of the faulty component,
– the condition of the wires (melted or cut insulation, wear).
or use the fault finding procedure to check the circuit of the faulty component.
Conformity check
The conformity check is designed to check the states and parameters which do not display any faults on the
diagnostic tool when inconsistent. This phase therefore:
– diagnosis of faults that do not have a fault display, and which may correspond to a customer complaint.
– checks that the system is operating correctly and that there is no risk of a fault reappearing after repairs.
This section gives the fault finding procedures for states and parameters and the conditions for checking them.
If a state is not behaving normally or a parameter is outside permitted tolerance values, you should consult the
corresponding fault finding page.
Customer complaints – Fault finding charts
If the diagnostic tool check is correct, but the customer complaint persists, it should be dealt with according to the
customer complaint.IMPORTANT
The left-hand and right-hand Xenon bulb computers are powered when the dipped headlights are lit. Fault finding
procedures can only be carried out on them after the ignition has been switched on in fault finding mode (+ after
ignition imposed) and the dipped headlights are on.
A synopsis of the general procedure to follow is provided on the following
page in the form of a logic flow chart.
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Introduction
88C
88C - 4V3 MR-372-J84-88C000$010.mif
AIRBAG ACU4
Vdiag: 04
4. FAULT FINDING PROCEDURE
Check the battery charge and
condition of the fuses
Print the system diagnostic sheet
(available in CLIP and in the
Workshop Repair Manual or
Technical Note)
Connect CLIP
Dialogue with
computer?no
yes
Read faults
no
Faults present
yes
Deal with faults found
Deal with stored faults
no
The symptom
persistsFault
solved
yes
See CHART 1
ACU4 Vdiag04 J84 1.0
Conformity check
no
The symptom
persistsFault
solved
Use ALP charts (fault finding
charts)
no
The symptom
persistsFault
solved
Contact Techline with the
completed fault finding log

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Configuration and programming
88C - 15
88C
V3 MR-372-J84-88C000$050.mif
AIRBAG ACU4
Vdiag: 04
CONFIGURATION / READ CONFIGURATION (continued):
Passenger airbag lock mode "WITH KEY" or "WITHOUT":
Read type of vehicle: LC034 "MEGANE II"
OTHER COMMANDS:
–VP006: Lock computer.
This command is used whenever servicing the system. It shuts down all trigger lines.
–VP007: Unlock computer.
This command unlocks the computer after it was locked.
–VP008: Write last After Sales service date.
This command is used to enter the date the system was serviced.
–VP010: Write VIN.
This command serves to enter the vehicle identification number (VIN) into the computer.
–SC004: Read impact context.
This command is used in reconditioning the vehicle following an impact. It obtains, from the
computer that is to be replaced, a list of the trigger lines controlled and the system's state at the
moment of impact.TITLECONFIGURATION
READINGCONFIGURATION
PASSENGER AIRBAG LOCK MODELC060 CF248
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Interpretation of faults
88C-20
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF002
PRESENT
COMPUTER SUPPLY VOLTAGE
1.DEF: Micro-cut
2.DEF: Values beyond tolerance
NOTESSpecial notes: Use the 22-track adapter (Elé. 1685 when working on the computer
connector (cable 1).
Carry out the operations necessary to obtain the correct voltage supply to the computer: 10.5 V ± 0.1 < correct
voltage < 16 V ± 0.1.
– Check the battery charge.
– Check the charging circuit.
– Check the tightness and the condition of the battery terminals.
– Check the computer earth.
– Check the condition of the computer + locking connections.
AFTER REPAIRClear the computer memory then switch off the ignition.
Carry out the check again using the diagnostic tool and, if there are no faults, unlock
the computer.
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Interpretation of faults
88C-24
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF039
PRESENT
DRIVER'S SIDE SENSOR CIRCUIT
CO: Open circuit
CC.0: Short circuit to earth
1.DEF: Communication disrupted
2.DEF: Sensor internal electrical fault
3.DEF: External diagnostics
NOTESSpecial notes: Use the 64-track adapter (Elé. 1717) when working on the computer
connector.
CO - CC.0 - 1.DEF
NOTESNone.
Lock the computer using the command on the diagnostic tool.
Check that the driver's side sensor is connected correctly and check its connections.
Check the condition of the connections on the computer (tracks 27 and 28).
Check the condition of the 64-track connector (locking system, connections, etc.).
Check the continuity and insulation of the connections between:
Bornier (Elé. 1717) terminal 27 Track 1 sensor connector
Bornier (Elé. 1717) terminal 28 Track 2 sensor connector
2.DEF - 3.DEF
NOTESIf the fault is still present, check whether the sensor fitted is
compatible with the airbag computer connected to the
vehicle. If not, order the sensor specifically for the airbag
fitted.
Replace the driver's side sensor.
AFTER REPAIRClear the computer memory then switch off the ignition.
Carry out the check again using the diagnostic tool and, if there are no faults, unlock
the computer.
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Interpretation of faults
88C-25
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF040
PRESENT
PASSENGER SIDE SENSOR CIRCUIT
CO: Open circuit
CC.0: Short circuit to earth
1.DEF: Communication disrupted
2.DEF: Sensor internal electrical fault
3.DEF: External diagnostics
NOTESSpecial notes: Use the 64-track adapter (Elé. 1717) when working on the computer
connector.
CO - CC.0 - 1.DEF
NOTESNone.
Lock the computer using the command on the diagnostic tool.
Check that the driver's side sensor is connected correctly and check its connections.
Check the condition of the connections on the computer (tracks 61 and 62).
Check the condition of the 64-track connector (locking system, connections, etc.).
Check the continuity and insulation of the connections between:
Bornier (Elé. 1717) terminal 61 Track 1 sensor connector
Bornier (Elé. 1717) terminal 62 Track 2 sensor connector
2.DEF - 3.DEF
NOTESIf the fault is still present, check whether the sensor fitted is
compatible with the airbag computer connected to the
vehicle. If not, order the sensor specifically for the airbag
fitted.
Replace the passenger side sensor.
AFTER REPAIRClear the computer memory then switch off the ignition.
Carry out the check again using the diagnostic tool and, if there are no faults, unlock
the computer.
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Interpretation of faults
88C-30
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF065
PRESENT
DRIVER'S SEAT POSITION SENSOR CIRCUIT
CO: Open circuit
CC.0: Short circuit to earth
CC.1: Short circuit to + 12 V
1.DEF: Below minimum threshold
2.DEF: Values outside the limits
NOTESPriorities when dealing with a number of faults: If DF065 is present with at least
one of faults DF077, DF210, DF232, or DF240, begin the fault finding by checking the
22-track under-seat connector.
Special notes: Use the 64-track adapter (Elé. 1717) when working on the computer
connector.
Lock the computer using the command on the diagnostic tool.
Fit the 64-track test adapter (Elé. 1717) and measure the resistance between track 9 and track 10,
with the seat in the forward position and in the back position.
In the forward position, the resistance should be approximately 400Ω (275 < Ξ < 545 Ω)
In the back position, the resistance should be approximately 100Ω (65 < Ξ < 145 Ω)
If the resistances are correct, check the connections of the 64-track computer connector.
Check the connections of the 22-track connector under the seat. Repair if necessary.
Fit the 22-track test adapter (Elé. 1687) and measure the resistance between tracks 3 and 4, with the seat in
the forward position and in the back position.
In the forward position, the resistance should be approximately:400Ω (275 < X < 545)
In the back position, the resistance should be approximately: 100Ω (65 < X < 145)
Are the values correct?
NO
YES
Check the connection and the condition of the sensor connectors.
Check the continuity and insulation of the connections between:
Bornier Track 3 Track 2 sensor connector
Bornier Track 4 Track 1 sensor connector
If the checks are correct, replace the seat position sensor.
Check the connections of the seat connector (tracks 3 and 4) again, as well as the
connections of the 64-track connector (tracks 9 and 10).
If the fault persists, the wiring is faulty between the computer and the driver's seat
(C0/C1).
Replace the wiring if necessary.
AFTER REPAIRReconnect the computer, the seat position sensor, and the under-seat connector, then
switch on the ignition again. Clear the computer memory then switch off the ignition.
Carry out the check again using the diagnostic tool and, if there are no faults, unlock
the computer.
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Interpretation of faults
88C-42
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF071
CONTINUED
CC.1 - CC.0
NOTESNone.
Lock the computer using the command on the diagnostic tool.
Switch off the ignition and unclip the driver's frontal airbag.
Check the condition and correct connection of the trigger lines.
Fit the 10-track test adapter to the rotary switch at point C2 (tracks 9 and 10).
The CLIP or XRBAG tools must be used to measure the appropriate insulation for the type of fault on cable A
(driver's front airbag connected).
If the value obtained is incorrect, replace the rotary switch beneath the steering wheel.
Reconnect the rotary switch under the steering wheel, disconnect the computer and check the connector
connections (tracks 4 and 15).
Fit the 22-track test adapter (Elé. 1685).
The CLIP or XRBAG tool must be used to measure the appropriate insulation for the type of fault on adapter
cable D.
If the value obtained is incorrect, the wiring is faulty between the computer and the rotary switch connector
(C0/C2). Replace the wiring if necessary.
AFTER REPAIRReconnect the computer and driver's frontal airbag ignition modules, then switch on the
ignition again.
Clear the computer memory then switch off the ignition.
Carry out the check again using the diagnostic tool and, if there are no faults, unlock
the computer. When replacing the airbag module, do not forget to reconnect the earth
on the new one.
Destroy the driver's front airbag if it has been replaced (tool Elé. 1287).
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Interpretation of faults
88C-44
88C
V3 MR-372-J84-88C000$071.mif
AIRBAG ACU4
VDIAG No.: 04
DF072
CONTINUED
CC.1 - CC.0
NOTESNone.
Lock the computer using the command on the diagnostic tool.
Switch off the ignition and unclip the driver's frontal airbag.
Check the condition and correct connection of the trigger lines.
Fit the 10-track test adapter (Elé. 1617) to the rotary switch at point C2 (tracks 6 and 7).
The CLIP or XRBAG tool must be used to measure the appropriate insulation for the type of fault on cable B
(driver's front airbag connected).
If the value obtained is incorrect, replace the rotary switch beneath the steering wheel.
Reconnect the rotary switch under the steering wheel, disconnect the computer and check the connector
connections (tracks 3 and 14).
Fit the 22-track test adapter (Elé. 1685).
The CLIP or XRBAG tool must be used to measure the appropriate insulation for the type of fault on adapter
cable C.
If the value obtained is incorrect, the wiring is faulty between the computer and the rotary switch connector
(C0/C2). Replace the wiring if necessary.
AFTER REPAIRReconnect the computer and driver's frontal airbag ignition modules, then switch on the
ignition again.
Clear the computer memory then switch off the ignition.
Carry out the check again using the diagnostic tool and, if there are no faults, unlock
the computer. When replacing the airbag module, do not forget to reconnect the earth
on the new one.
Destroy the driver's front airbag if it has been replaced (tool Elé. 1287).
ACU4 Vdiag04 J84 1.0

AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Fault Interpretation
88C - 51
88C
V3 MR-372-J84-88C000$072.mif
AIRBAG ACU4
Vdiag: 04
DF091
PRESENT
AIRBAG LOCKING SWITCH CIRCUIT
CO : Open circuit
CC.0 : Short circuit to earth
CC.1 : Short circuit to + 12 V
1.DEF : Below minimum threshold
2.DEF : Values out of range
NOTESSpecial notes: Use the 22-track (Elé. 1685) adapter for working on the computer
connector.
Lock the computer using the command on the diagnostic tool.
Check that the lock switch is properly connected and check its connections.
Check the condition and connections of the 22-track computer connector (lock system, wiring etc.).
Ensure continuity and insulation of the connections between:
Terminal block Elé. 1685 terminal 21 Track 6 lock switch connector
Terminal block Elé. 1685 terminal 22 Track 3 lock switch connector
Replace the locking switch if the fault persists.
AFTER REPAIRReconnect the computer and the locking switch, then switch on the ignition.
Clear the computer memory then switch off the ignition.
Carry out the check again using the diagnostic tool and, if there are no faults, unlock
the computer.
ACU4 Vdiag04 J84 1.0