2010 RENAULT SCENIC heater

62A - 4
AIR CONDITIONING
Fault finding - Introduction62A
V4
Manual air conditioning
and
Climate control
Faults
Faults are declared either present or stored (depending on whether they appeared in a certain situation and have
disappeared since, or whether they remain but have not been diagnosed within the current context).
The present or stored status of faults should be taken into consideration when the diagnostic tool is used after the
+ after ignition feed has been supplied (without acting on the system components).
For a present fault, apply the procedure described 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 for these lines (for oxidation, bent pins, etc),
–the resistance of the component detected as faulty,
–The condition of the wires (insulation melted or split, chafing, etc.).
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 inconsistent. Therefore, this phase is used to:
–carry out fault finding on faults that do not have a fault display, and which may correspond to a customer complaint.
–check that the system is operating correctly and that there is no risk of a fault recurring after repairs.
This section features 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.
Notes about the conformity check for the climate control system
The air conditioning system conformity check is divided into four parts. The parts relate to the four air conditioning
subsystems, heater, cold loop, user selection and passenger compartment ventilation.
The statuses and parameters related to these sub-functions are listed with their respective computers.
NOTE: the manual air conditioning control panel does not control electrical components and cannot be subjected to
fault finding. Therefore, there is no conformity check in the 62C Manual air conditioning section.
Customer complaints – Fault finding charts
If the test with the diagnostic tool is OK, but the customer complaint persists, the fault should be treated by
customer complaints. Note:
The interpretation of statuses, parameters and commands is also split into several sections. Everything controlled
by the air conditioning control panel is explained in the two Air conditioning sections, 62A and 62B. By contrast,
signals from other computers are explained in the "fault finding" sections for these computers (see the conformity
check).
A synopsis of the general procedure to follow is provided on the following
page in the form of a flowchart.
CLIM X84 1.1
Edition 2
MR-372-J84-62A000$020.mif

62A - 12
AIR CONDITIONING
Fault finding - Mode of operation62A
V4MR-372-J84-62A000$010.mif
Manual air conditioning
and
Climate control
Block diagram of components controlled or managed by the control panel of heater
versions without air conditioning
Ventilation unit
Passenger
compartment
blower
Resistor
unitRecircu-
lation flapDistribution
flapMixing
flap
Vehicle multiplex
network
Actuator control
user control panel
Button lights (heated rear
screen button)Passenger
compartment blower
operation signal
(running or stopped)User request
management (heated
rear screen button
pressed)
UCH
Transmission of the request
to switch on the heated rear
screen
Key:
Wire connections =
Multiplex connections =
Mechanical connections =
(cable controls)
CLIM X84 1.1
Edition 2
MR-372-J84-62A000$040.mif

62A - 23
AIR CONDITIONING
Fault finding - Conformity check62A
V4
Manual air conditioning
and
Climate control
Subsystem: heating (continued 1)
Computer
(signal generator)Parameter or status
checked or actionDisplay and Notes Fault finding
UCHPR001:Battery voltage.10.5 < X < 14.4 volts.If there is a fault, refer to the
fault finding procedure
for this parameter. If the
fault is still present, carry
out a fault finding test on
the charge circuit.
PR002:Exterior
temperature.X = exterior temperature
± 5 ˚C
(invalid value: 215 ˚C).If there is a fault, refer to the
fault finding procedure
for this parameter.
ET025:Retractable roof.CLOSED or NOT CLOSED
ABSENT if the vehicle does
not have one.If there is a fault, refer to the
fault finding procedure
for this status.
ET091:Engine running:NO
NOTE: This status is
displayed via the UCH but it
is generated by the injection
computer.If there is a fault, refer to the
fault finding procedure
for this status.
(Injection Technical Note).
ET015:Passenger
compartment
blower.INACTIVE
(according to test
conditions: see Notes).If there is a fault, refer to the
fault finding procedure
for this status.
NOTE: This status is only
operative for manual air
conditioning (and heater
versions without air
conditioning).
ET026:Heated rear
screen switch.INACTIVE
(Inhibited with engine
stopped).If there is a fault, refer to the
fault finding procedure
for this status.
ET031:Fast idle request
for RCH.INACTIVE
(Inhibited with engine
stopped).If there is a fault, refer to the
fault finding procedure
for this status.
ET017:Number RCH
required.0, 1, 2 or 3 for Mégane
saloons and sport hatches
(1000 watt RCH).
0, 1, 2, 3, 4 or 5 for Mégane
Scénics (1800 watt RCH).
(according to heat
requirement).If there is a fault, refer to the
fault finding procedure
for this status.
CLIM X84 1.1
Edition 2
MR-372-J84-62A000$060.mif

62A - 27
AIR CONDITIONING
Fault finding - Conformity check62A
V4
Manual air conditioning
and
Climate control
Subsystem: user selection (continued)
Computer
(signal generator)Parameter or status
checked or actionDisplay and Notes Fault finding
UCHET029:Air conditioning
button.PRESSED if the AC button
on the air conditioning
control panel is pressed.
RELEASED otherwise.If there is a fault, refer to the
fault finding procedure
for this status.
NOTE: This status is only
operative for manual air
conditioning.
ET028:Heated rear
screen button.PRESSED if the heated
rear screen button on the
air conditioning control
panel is pressed.
RELEASED otherwise.If there is a fault, refer to the
fault finding procedure
for this status.
NOTE: This status is only
operative for manual air
conditioning (and heater
versions without air
conditioning).
ET015:Passenger
compartment
blower.INACTIVE
(according to test
conditions: see Notes).If there is a fault, refer to the
fault finding procedure
for this status.
NOTE: This status is only
operative for manual air
conditioning (and heater
versions without air
conditioning).
AC015:Air conditioning
button light.Command enabling the air
conditioning button light to
be illuminated to check its
operation.If there is a fault, consult the
fault finding procedure
for this command.
NOTE: This command only
operates for manual air
conditioning.
AC019:Heated rear
screen indicator
light.Command enabling the
heated rear screen button
light to be illuminated to
check its operation.If there is a fault, consult the
fault finding procedure
for this command.
NOTE: This command only
operates for manual air
conditioning (and heater
versions without air
conditioning).
CLIM X84 1.1
Edition 2
MR-372-J84-62A000$060.mif

62A - 31
AIR CONDITIONING
Fault finding - Conformity check62A
V4
Manual air conditioning
and
Climate control
Subsystem: cold loop (continued 1)
Computer
(signal generator)Parameter or status
checked or actionDisplay and Notes Fault finding
UCHET030:Air conditioning
request 2.ACTIVEIf there is a fault, refer to the
fault finding procedure
for this status.
NOTE: This status
represents the request from
the UCH to the injection
computer to engage the
compressor (refer to the
flowchart in the general
operation section).
PR002:Exterior
temperatureX = exterior temperature
± 5 ˚C
(invalid value: 215 ˚C)If there is a fault, refer to the
fault finding procedure
for this parameter.
ET015:Passenger
compartment
blower.ACTIVE
(according to test
conditions: see Notes).If there is a fault, refer to the
fault finding procedure
for this status.
Note: This status is only
operative for manual air
conditioning(and heater
versions without air
conditioning).
ET091:Engine running:YES
NOTE: This status is
displayed by the UCH but it
is generated by the injection
computer.If there is a fault, refer to the
fault finding procedure
for this status.
(Injection Technical Note).
InjectionET079:Air conditioning
present.YES
(automatic injection
computer configuration).If the status displays NO,
consult the fault finding
procedure for this status.
PR064:Coolant
temperature.X = engine coolant
temperature.If there is a fault, refer to the
fault finding procedure
for this parameter.
ET004:Air conditioning
authorisation.YESIf the status displays NO,
consult the fault finding
procedure for this status.
CLIM X84 1.1
Edition 2
MR-372-J84-62A000$060.mif

62A - 36
AIR CONDITIONING
Fault finding - Conformity check62A
V4
Manual air conditioning
and
Climate control
Subsystem: heating (continued 1)
Computer
(signal generator)Parameter or status
checked or actionDisplay and Notes Fault finding
UCHPR001:Battery voltage.12.5 < X < 14.4 volts.If there is a fault, refer to the
fault finding procedure
for this parameter. If the
fault is still present, carry
out fault finding on the
charge circuit.
PR002:Exterior
temperature.X = exterior temperature
± 5˚C
(invalid value: 215 ˚C).If there is a fault, refer to the
fault finding procedure
for this parameter.
ET025:Retractable roof.CLOSED or NOT CLOSED
ABSENT if the vehicle does
not have one.If there is a fault, refer to the
fault finding procedure
for this status.
ET091:Engine running:YES
NOTE: This status is
displayed by the UCH but it
is generated by the injection
computer.If there is a fault, refer to the
fault finding procedure
for this status.
(Injection Technical Note).
ET015:Passenger
compartment
blower.ACTIVE
(according to test
conditions: see Notes).If there is a fault, refer to the
fault finding procedure
for this status.
NOTE: This status is only
operative for manual air
conditioning(and heater
versions without air
conditioning).
ET026:Heated rear
screen switch.ACTIVE if the heated rear
screen is operating.
INACTIVE otherwise.If there is a fault, refer to the
fault finding procedure
for this status.
ET031:Fast idle request
for RCH.ACTIVE if the RCH are
operating.
INACTIVE otherwise.If there is a fault, refer to the
fault finding procedure
for this status.
ET017:Number RCH
required.0, 1, 2 or 3 for Mégane
saloons and sport hatches
(1000 watt RCH).
0, 1, 2, 3, 4 or 5 for Mégane
Scénics (1800 watt RCH).
(according to heat
requirement).If there is a fault, refer to the
fault finding procedure
for this status.
CLIM X84 1.1
Edition 2
MR-372-J84-62A000$060.mif

62A - 40
AIR CONDITIONING
Fault finding - Conformity check62A
V4
Manual air conditioning
and
Climate control
Subsystem: user selection (continued)
Computer
(signal generator)Parameter or status
checked or actionDisplay and Notes Fault finding
UCHET029:Air conditioning
button.PRESSED
(AC button on the manual
air conditioning control
panel pressed).If there is a fault, refer to the
fault finding procedure
for this status.
NOTE: This status is only
operative for manual air
conditioning.
ET028:Heated rear
screen button.PRESSED if the heated
rear screen button on the
air conditioning control
panel is pressed.
RELEASED otherwise.If there is a fault, refer to the
fault finding procedure
for this status.
NOTE: This status is only
operative for manual air
conditioning(and heater
versions without air
conditioning).
ET015:Passenger
compartment
blower.ACTIVE
(according to test
conditions: see Notes).If there is a fault, refer to the
fault finding procedure
for this status.
NOTE: This status is only
operative for manual air
conditioning(and heater
versions without air
conditioning).
AC015:Air conditioning
button light.Command enabling the air
conditioning button light to
be illuminated to check its
operation.If there is a fault, consult the
fault finding procedure
for this command.
NOTE: This command only
operates for manual air
conditioning.
AC019:Heated rear
screen indicator
light.Command enabling the
heated rear screen button
light to be illuminated to
check its operation.If there is a fault, consult the
fault finding procedure
for this command.
NOTE: This command only
operates for manual air
conditioning (and heater
versions without air
conditioning).
CLIM X84 1.1
Edition 2
MR-372-J84-62A000$060.mif

AIR CONDITIONING
Fault finding - Fault Finding Chart62A
62A-46V4 MR-372-J84-62A000$080.mif
Manual air conditioning
and
Climate control
ALP 6
CONTINUED
With the engine warm and
passenger compartment ventilation
operating, vary the position of the
mixing flap from the very cold
position to the very hot position and
check subjectively that there is a
difference in temperature.
Can you feel the difference in
temperature?
YES
NOFor climate control systems:
Carry out a conformity check on the mixing motor
(PR012 Mixing motor). If the conformity check does not
reveal any faults, look for a mechanical fault with the
mixing flap (condition of the motor's toothed sector, flap
jammed inside the unit, etc.).
For manual air conditioning and heater versions:
Check the condition and routing of the mixing flap
control cable. Eliminate any constraints on it: kinks,
cable restricted by plastic clips, etc. Replace it if
necessary. Unclip the cable from the side of the unit and
check the stiffness of movement of each component:
control button and flap control on the air distribution unit.
Check that there is no mechanical fault with the mixing
flap (flap jammed inside the unit, etc.).
Carry out any necessary repairs.
Is the fault still present?
YES
Is the lower heater matrix pipe
(coolant inlet) hot?
NOTE: Pipe located on the left-hand
side of the heater-air conditioning
unit, near the engine bulkhead.
YES
Check that the heater matrix is not blocked: The top heater matrix pipe should be hot.
NOTE: Pipe located on the left-hand side of the heater-air conditioning unit, near the engine
bulkhead. Clean the heater matrix or replace it if necessary.
Is the fault still present?
YES NO
If the vehicle is fitted with passenger compartment heating
resistors (RCH), check that these are operating correctly by
referring to the fault finding procedure in the UCH Technical Note.
NOCarry out a check on the coolant circuit and
ensure that the thermostatic valve opens at the
correct temperature.
Replace the valve if necessary.
NO
End of fault finding procedure.
AFTER REPAIRPerform a complete check using the diagnostic tool.
CLIM X84 1.1
Edition 2