Lancia THESIS. Service Manual - part 9

Action

The presence of water

in the fuel circuit may
cause serious damage

to the entire injection system
and cause irregular engine
operation. If there is water in
the fuel filter or the sensor is
faulty contact a Lancia
Dealership as soon as possible

140

Parking sensors

Warning light/symbol

t

Message

PARKING SENSOR

FAULT

GO TO DEALER

Meaning of the message

One or more parking sensor

failure

Action

Contact a Lancia

Dealership

Diesel fuel filter (JTD versions) 

Warning light/symbol

c

è c

Message

MOISTURE IN DIESEL 

FUEL FILTER

GO TO DEALER

DIESEL FUEL FILTER

SENSOR FAULT

GO TO DEALER

Meaning of the message

Water in diesel fuel 

filter

Water in diesel fuel filter sensor 

failure

141

Twilight sensor

Warning light/symbol

1

Message

TWILIGHT SENSOR 

FAULT

GO TO DEALER

Meaning of the message

The twilight sensor, for switching

on/off automatically the external

lights is faulty

Action

Contact a Lancia

Dealership

Engine oil level sensor (JTD versions)

Warning light/symbol

è k

Message

ENGINE OIL 

LEVEL SENSOR FAULT

GO TO DEALER

Meaning of the message

Engine oil level sensor 

failure

Action

Contact a Lancia

Dealership

Message

ANTIPOLLUTION

FILTER

CLOGGED

SEE HENDBOOK

Meaning of the message

Anti-pollution filter clogged

Action

Keep the engine running until 

the symbol disappears from 

the display

Antipollution filter clogged (2.4 JTD 

20V

CAE version)

Warning light/symbol

è

Message

CHANGE

ENGINE OIL

Meaning of the message

Change engine oil

Action

Restore proper oil level 

(see “Checking levels” in section

“Car maintenance”)

Change engine oil (2.4 JTD 

20V

CAE version)

Warning light/symbol

142

CLIMATE CONTROL SYSTEM

fig. 112

L0A6018b

143

1 - Windscreen defrosting/demist-

ing vents

2 - Front side windows defrost-

ing/demisting vents

3

- Central directional and

adjustable vents

4 - Side directional and adjustable

vents

5 - Air vents on driver side

6 - Air vents on passenger side

7 - Directional and adjustable

vents on front doors

8 - Front footwell air vents

9 - Rear footwell air vents

10 - Rear central directional and

adjustable vents

11 - Rear side directional and

adjustable vents

The climate control system can be

operated in one of the following
ways:

– manually, by selecting the func-

tions by means of the control panel
buttons;

– automatically, by means of the

system electronic control unit.

The air is let into the passenger

compartment through a set of vents
on the dashboard, on the front door
panels, on the rear central tunnel, on
door posts and on the floor as shown
in (fig. 112).

The amount of air is adjusted with

control B:

O = all open
ç = all closed.

fig. 117

L0A0056b

fig. 116

L0A0055b

144

DIRECTIONAL AND
ADJUSTABLE VENTS 
(fig. 113-114-115-116-117) 

The vents can be turned upwards

or downwards and towards the left
and the right with control A

.

Front

door vents (fig. 115) can be turned
only upwards or downwards.

fig. 115

L0A0057b

fig. 114

L0A0058b

fig. 113

L0A0062b

Fixed vents C (fig. 114) for

demisting or defrosting the front
side windows are located at the
dashboard ends.

AIR VENTS 

The car is fitted with three air

vents set on the dashboard: two
vents A (fig. 118) on driver side and
one B (fig. 119) on passenger side,
sending air in the passenger com-
partment in a “diffused” mode.

This particular function conveys air

at low speed, about half of the usual
flow, through additional vents.
Moreover, it reduces the air impact
on the passengers and the noise due
to the air coming out of the vents,
thus improving the passengers' com-
fort.

IMPORTANT When the outside

temperature is very high (over 30°C),
to reach the selected temperature as
soon as possible, it is suggested to op-
erate air vents only after the system
has reached steady working condi-
tions.

IMPORTANT On versions equipped

with solar cell operated sunroof
(where provided), to check operation
at first speed of climate control sys-
tem fan when the car is parked, dis-
engage air vents and set air distribu-
tion from central dashboard vents
only before leaving the car.

fig. 119

L0A0060b

fig. 120

L0A0059b

fig. 118

L0A0061b

145

Air vents (open) are actually used

only when the control for directing
air flow on the instrument panel is
operated.

Air vents are opened by rotating

the dashboard central vent knobs
beyond the upper stop limit (fig.
120):

– control A for air vents on driver

side

– control B for air vent on passen-

ger side.

At the stop limit of these controls

there is a button which, if pressed,
sends a signal to the climate system
control unit.

146

AUTOMATIC 
CLIMATE 
CONTROL SYSTEM

GENERAL

The car can be equipped with a

two-zone or multi-zone automatic
climate control system.

The two-zone climate control sys-

tem controls temperature, air distri-
bution and flow inside the passenger
compartment in two areas: driver
side and passenger side.

The multi-zone climate control sys-

tem controls temperature, air distrib-
ution and flow inside the passenger
compartment in three areas: driver
side, passenger side or back-seat pas-
sengers.

Control of front-seat passenger and

back-seat passengers is alternated;
when the button led REAR is turned
off, the front-seat passenger control
is operating, whereas when button
REAR is pressed (button led turned
on), the back control panel is acti-
vated, thus excluding those for the
front-seat passenger.

Temperature check is based on the

“heat balance” concept, which
means that the system works con-
stantly to keep a regular balance
between incoming and outgoing heat
energy, in order to stabilize temper-
ature inside the passenger compart-
ment and compensate possible vari-
ations of outside climate, sun radi-
ance included. For optimal control
of temperature in the two areas of
the passenger compartment, the sys-
tem is equipped with a sun ray sen-
sor.

The system features a pollution

sensor which can automatically
switch the air recirculation function
on to reduce the unpleasant effects
of polluted air in cities, queues, tun-
nels and when the windscreen wash-
er is operated (with the characteris-
tic smell of alcohol).

The air quality is controlled by an

active carbon dust/pollen filter
which has the double function of
mechanically filtering the particles
dispersed in the air and attenuating
the peak accumulation of certain
pollutants.

Parameters and functions auto-

matically controlled are the follow-
ing:

– temperature of air let into dri-

ver/passenger vents (front-seat/
back-seats);

– air distribution to vents on dri-

ver/passenger side (front-seat/
back-seats);

– fan speed (continuos variation of

air flow);

– compressor activation (to cool

air);

– air recirculation.

All these functions can be adjusted

manually, it means that one or more
system functions can be selected and
that it is possible to change their
parameters. However, in this way
the system is unable to control man-
ually selected functions which will
be changed by the system only for
safety reasons, while keeping the
required temperature.

147

IMPORTANT During air distribu-

tion automatic management, all the
air distribution button leds are off.
User can select manually any distri-
bution, and only in this case, the
concerned button led will be lit.

The manual settings have priority

over the automatic settings until the
user returns the system to automatic
control.

Manual setting of a function does

not compromise automatic control
of the other functions.

The amount of air let into the pas-

senger compartment does not
depend on the car speed. It is in fact
adjusted by an electronically con-
trolled fan.

The temperature of the air let into

the passenger compartment is
always controlled automatically
(unless the system is off), according
to the temperatures set on the dri-
ver’s and front/rear passenger’s dis-
plays.

The following parameters and

functions can be adjusted manually:

– air temperature on driver/pas-

senger side (front/rear);

– fan speed (continuous variation);

– air distribution in seven positions

(driver/passengers);

– diffused air distribution;

– compressor activation;

– priority of one-zone/two-zone

distribution (front/back);

– rapid defrosting/demisting func-

tion;

– air recirculation;

– automatic/manual system con-

trol;

– heated rear window;

– system off;

– activation of back control panel.

The defrosting/demisting function

includes a set of operations enabling
to defrost/demist rapidly both the
windscreen and the heated rear win-
dow.

At each turning off, the system

after storing control and function
conditions, sets up the open recircu-
lation, thus creating the necessary
conditions for operation at first
speed of climate control system fan
at parking, fed by solar cell operated
sunroof (where provided).

IMPORTANT Best operation of

climate control system fan at park-
ing, fed by solar cell operated sun-
roof (where provided), is obtained
by closing completely the windows
and sunroof. Furthermore, to check
operation at first speed of climate
control system fan when the car is
parked, disengage air vents and set
air distribution from central dash-
board vents only before leaving the
car.

When turning on, the system

restores the conditions memorized
before turning off, except for the
rapid defrosting/demisting function
which is reset. 

148

FRONT CONTROL PANEL (fig. 121)

fig. 121

L0A0054b

INITIALISING THE AIR
CONDITIONING CONTROL UNIT 

Whenever the battery is electrically

connected again or it is reloaded
after being completely flat or after
replacing one of the protection fuses,
to restore the correct operation of
the air conditioning, of the door
locking and of the ESP system. It is
necessary to perform the initialisa-
tion operations contained in the
paragraph “If battery is to be dis-
connected” in the chapter “In an
emergency”.

149

1 - Button for automatic system

selection (driver side)

2 - Inside temperature adjustment

knob (driver side) 

3 - Air recirculation button (auto-

matic, always turned on or off)

4 - Display for set inside tempera-

ture and system status (driver side)

5 - Fan speed display 

6 - Display for set inside tempera-

ture and system status (passenger
side)

7 - Air conditioner compressor off

button

8 - Inside temperature adjustment

knob (front passenger side)

9 - Button for automatic system

selection (front passenger side)

10 - Air distribution buttons (front

passenger side)

11 - Button for activation of back

control panel

12 - Button for turning on/off

heated rear window and defrosting
of external rearview mirrors

13 - Button for fan speed increase

14 - Button for fan speed reduction

15 - Button for turning on/off fast

defrosting/demisting of windscreen,
front side windows, rear window,
external rearview mirrors and wind-
screen wiper nozzles

16 - Button for balancing tempera-

ture and air distribution in the pas-
sengers’ area (front/back-seats)
with the driver’s area

17 - Inside temperature sensor

18 - Air distribution buttons (dri-

ver side)

150

The cooling system uses

coolant “R134a” refriger-
ating fluid that meets cur-

rent regulations and does not
pollute the environment if it acci-
dentally leaks. Under no circum-
stances should other fluids be
used which are incompatible
with the system components.

BACK CONTROL PANEL 
(fig. 122)

1 - Inside temperature adjustment

knob (back-seat passengers)

2 - Display for set inside tempera-

ture (back-seat passengers)

3 - Fan speed display 

4 - System status display (AUTO,

FULL AUTO) 

5 - Button for automatic system

selection (back-seat passengers)

6 - Button for rear footwell air

vents

7 - Button for fan speed reduction

8 - Button for fan speed increase

9 - 

Button for air distribution
through front back vents 

fig. 122

L0A0101b

151

HOW TO USE THE CLIMATE
CONTROL SYSTEM

The system can be switched on in

various ways. We recommend start-
ing by pressing the AUTO button
and setting the required tempera-
tures on the display.

Since the system controls three

areas of the passenger compartment,
the driver and the front/back pas-
sengers can select different tempera-
ture values, with a maximum differ-
ence accepted by the system of 7 °C.

In this way, the system will start

working fully automatically to reach
the required temperature as soon as
possible. It will maintain the tem-
perature by adjusting the amount
and distribution pattern of the air let
into the passenger compartment and
manage the recirculation function
and the climate control system com-
pressor.

When the system is working auto-

matically, the only possible manual
functions are:

– MONO, to align air temperature

and distribution on the passenger
side or in the back-seat passengers’
area with that on the driver side;

– REAR, to activate the back con-

trol panel; 

–

√, to switch off the compressor:

in these conditions the system works
only as a heater;

– air recirculation, to keep recircu-

lation always turned on or off;

–

-, for faster defrosting/demist-

ing the front windows, rear window,
external rearview mirrors and wind-
screen wiper nozzles;

–

(, for defrosting/demisting the

heated rear window and external
rearview mirrors.

The temperature, air distribution

and fan speed settings can be
changed at any time during auto-
matic system operation. The system
will automatically adjust to the new
request. When the system is fully
working in automatic mode (FULL
AUTO), if air distribution and/or
flow is changed, definition FULL
disappears. In this way functions
pass from the automatic mode to the
manual mode, until button AUTO is
pressed again. There is only one fan
speed for all the passenger compart-
ment areas and it can be changed
also by operating back controls,
when activated.

With one or more functions manu-

ally on, the air temperature let into
the passenger compartment is auto-
matically managed by the system
unless the climate control compres-
sor is off. In this condition, in fact,
the air inlet into the passenger com-
partment cannot have a lower tem-
perature than that of the external
air.

152

CONTROLS

Knobs for adjusting air tempera-
ture (2, 8 fig. 121 - 1 fig. 122)

Turn the knobs towards the right

or towards the left to raise or lower
the air temperature required respec-
tively in the front left-hand area
(knob 2 fig. 121) and in the front
right-hand area (knob 8 fig. 121) or
back area (knob 1 fig. 122) of the
passenger compartment. 

Since the system controls three

areas of the passenger compartment,
the driver and the front/back-seat
passengers can select different tem-
perature values with a maximum
difference accepted by the system of
7 °C.

Temperature control in the front

passenger area and in the back pas-
senger area is alternated; when the
button led REAR is off, control of
front passenger side is on, but when
button REAR is pressed (button led
on) the back control panel is activat-
ed.

The set temperatures are shown on

the displays set near the respective
knobs.

Press button 16 (MONO - fig. 121)

to automatically align the
(front/back) passenger temperature
to the temperature on driver’s side.
Consequently the temperature in the
two areas can be set simply by turn-
ing the knob on the driver side 2
(fig. 121). This function is provided
to facilitate adjusting the temperature
in the passenger compartment when
only the driver is present. The sepa-
rate operation of the set temperatures
and air distribution is automatically
reset when knobs 8 (fig. 121) or 1
(fig. 122) are turned or button 16
(MONO - fig. 121) is pressed again,
when the button led is turned on. 

Turn the knobs fully to the right or

to the left to the end positions HI or
LO, to obtain maximum heating or
cooling, respectively:

– HI function (maximum heating):

this is switched on by turning the
temperature knob to the right
beyond the maximum value (32 °C).
It can be independently switched on
from driver’s side or from
(front/back) passenger’s side or
from both sides (also by selecting the
MONO function).

This function can be switched on to

speed up heating in the passenger
compartment by exploiting the sys-
tem potential to the maximum. The
function employs the maximum
coolant temperature while the air
distribution and fan speed are set by
the system according to environ-
mental conditions. In particular, if
the coolant temperature is not suffi-
cient, the function does not switch
the fan on at top speed to limit let-
ting into air which is not adequately
warm.

All the manually settings can be

adjusted when the function is on. 

153

To switch this function off, turn

the temperature knob to the left and
set the required temperature.

– LO function (maximum cooling):

it is activated by turning the temper-
ature knob to the left beyond the
minimum value (16 °C). It can be
independently switched on from dri-
ver’s side or from (front/back) pas-
senger’s side or from both sides (also
by selecting the MONO function).

This function can be switched on to

speed up cooling the passenger com-
partment by exploiting the system
potential to the maximum. This
function cuts out the heater and
switches the air recirculation and the
climate control compressor on. The
air distribution and the fan speed
are selected according to the envi-
ronmental conditions. All the manu-
ally settings can be adjusted when
the function is on. To switch this
function off, turn the temperature
knob to the right and set the
required temperature.

Buttons for adjusting front air
distribution (10, 18 fig. 121)

Press these buttons to manually

select one of the seven possible air
distribution patterns in the front
passenger compartment (right and
left side):
A Air flow to windscreen and front
side window vents for defrosting/
demisting the windows.
F D Air flow to central and side
dashboard vents and the rear vents.

IMPORTANT On versions equipped
with solar cell operated sunroof
(where provided), to check opera-
tion at first speed of climate control
system fan when the car is parked,
disengage air vents and set air distri-
bution from central dashboard vents
only before leaving the car.
S Air flow to the front and rear
footwells. The air distribution pat-
tern, due to the natural tendency of
heat to move upwards, allows to
heat the passenger compartment up
as fast as possible. Furthermore, it
offers a prompt feeling of warmth to
the coolest parts of the body.

Air flow shared between
footwell vents (warmer air)

and central and side dashboard
vents and the rear vents (cooler air).
This air distribution pattern is par-
ticularly useful in middle seasons
(spring and autumn) when it is

sunny.

Air flow shared between the

footwell vents and the windscreen
and front side window
defrosting/demisting vents. This air
distribution pattern ensures a good
heating of the passenger compart-
ment and prevents possible misting
up.

Air flow distribution between
central and side dashboard

vents, rear vents and windscreen
and front side window vents. 

Air flow distribution
between all passenger com-

partment vents.

Air distribution setting is displayed

when leds relevant to the selected
button are lit, which will be turned
off in case of fully automatic opera-
tion (FULL AUTO).

F

S

D

A

F

A

D

FA

SD

154

When a combined function is set, if

a button is pressed the main func-
tion of the button pressed is activat-
ed, together with those already set. If
the button corresponding to a func-
tion which is already on is pressed,
such function will be cancelled (the
related led turns off).

Press the AUTO button to restore

air distribution control after a man-
ual setting.

When the driver selects the air dis-

tribution to the windscreen, also the
passenger side air flow is automati-
cally directed to the windscreen.
Anyway, the passenger can select
another air distribution pattern, by
pressing the related buttons.

Buttons for adjusting rear air
distribution (6, 9 fig. 122)

When the back control panel is

activated, it is possible to set one of
the three air distribution patterns for
the passenger compartment back
area by pressing the related buttons:
D Air flow to back central vents.
S Air flow to rear footwells. This air
distribution pattern, due to the nat-
ural tendency of heat to move
upwards, offers a prompt feeling of
warmth to the coolest parts of the
body.

S

D

Air flow shared between rear

footwell vents (warmer air) and cen-
tral rear vents (cooler air).

Air distribution setting is displayed

when leds relevant to the selected
button are lit, which will be turned
off in case of fully automatic opera-
tion (FULL AUTO).

When a combined function is set, if

a button is pressed the main func-
tion of the button pressed is activat-
ed, together with those already set. If
the button corresponding to a func-
tion which is already on is pressed,
such function will be cancelled (the
related led turns off).

Press the AUTO button to restore

air distribution control after a man-
ual setting.

155

Buttons for adjusting fan speed
(13, 14 fig. 121 – 7, 8 fig. 122)

Press respectively front control

buttons 13 or 14 (fig. 121) and back
control buttons 8 or 7 (fig. 122) to
increase or decrease the fan speed so
to adjust the amount of air let into
the passenger compartment while
keeping the required temperature
constant.

The fan speed is indicated by the

bars which light up on the front dis-
play 5 (fig. 121) and rear display 3
(fig. 122), when the back control
panel is active. Repeatedly press
button or keep pressed 13 (fig. 121)
or 8 (fig. 122) to switch the fan on
at top speed (all bars on).

Repeatedly press or keep pressed

button 14 (fig. 121) or 7 (fig. 122)
to switch the fan on at minimum
speed (one bar on).

When the fan minimum speed is

set up (one bar on), by keeping
pressed for at least two seconds but-
ton 14 (fig. 121) or 7 (fig. 122), the
climate control system is deactivated
and all the fan bars on the display
turn off; OFF message is displayed. 

The fan speed can be adjusted

manually through both the front
control panel and the rear control
panel, but it is the same one for the
whole passenger compartment.

IMPORTANT Press the AUTO

button to restore air distribution
control after a manual setting.

AUTO buttons 
(automatic operation)
(1, 9 fig. 121 - 5 fig. 122)

Press the AUTO button on the dri-

ver side and/or front/back-seat pas-
senger side: the system will automat-
ically control the air amount and
distribution pattern in the related
passenger compartment areas and
will cancel all the previously made
settings. This condition is marked by
the message FULL AUTO on the
system front and rear display,
besides the leds on the air distribu-
tion buttons turning off. 

If one of the functions automatical-

ly controlled by the system (air recir-
culation, air distribution, fan speed
or air conditioner compressor deacti-
vation) is manually adjusted, the
message FULL on the display turns
off to indicate that the system is no
longer controlling the functions inde-
pendently (apart from temperature
control that is always automatic).