2004 DAEWOO LACETTI Automatic

7D – 40IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
GENERAL INFORMATION
THE V5 SYSTEM
Refer to Section 7B, Manual Control Heating, Ventilation,
and Air Conditioning System,for general information de-
tails for the following:
S System Components – Functional.
S The V5 A/C System.
S V5 Compressor – Description of Operation.
S V5 Compressor – General Description.
SYSTEM COMPONENTS–CONTROL
Controller
The operation of the A/C system is controlled by the
switches on the control head. This console–mounted
heating and ventilation system contains the following
knobs and display:
Temperature Control Push Knobs
1. Raise the temperature of the air entering the ve-
hicle by pressing the top switch, with the red arrow
pointing upward.
2. Lower the temperature by pressing the bottom
switch, with the blue arrow pointing downward.
3. Actuate the air mix door by an electric motor.
4. Vary the mix of the air passing through the heater
core with the air bypassing the core.
Each press of a switch changes the set temperature by in-
crements of 0.5°C (1°F). This is shown in the temperature
window on the function display.
The Function Display
This is an LCD display indicating the status of the control
settings selected. Starting from the left end of the display,
the sections are as follows:
1. Temperature setting – Indicates the temperature set
with the temperature control knob.
2. Auto status – Indicates whether the system is oper-
ating in the full auto mode or the manual mode.
3. Defroster icon – Indicates manual selection of full
defrost mode.
4. Mode – Indicated by icon, the mode chosen by the
system in auto (or by the operator in manual) is
shown by an illumination arrow indicating the air
path.
5. A/C – A snowflake icon indicating whether the A/C
is ON or OFF.
6. Fan speed – Indicates the fan speed by illuminating
a bar based on the segment at the front, for low
speed, and adding additional segments in order up
to the fifth, for high speed.Eight Additional Push Knobs
1. Full defrost – Causes the mode motors to direct all
air to the windshield and aide window outlets for
maximum defrosting.
2. Air intake – Switches between fresh air intake, the
default, and recirculating air. Airflow arrows on the
display indicate the mode in effect.
3. Full Auto Switch – Maintains the set temperature
automatically. In this mode, the fully automatic tem-
perature control (FATC) system controls the follow-
ing:
S The air mix door motor.
S The mode door motor.
S The blower motor speed.
S The inlet air door motor.
S A/C ON/OFF.
4. OFF Switch – Turns the automatic air conditioning
and fan control off.
5. Mode Switch – Allows manual selection of the air-
flow direction.
S Selection is shown on the function display.
S Each time the mode switch is pressed, the next
function is displayed.
6. A/C Switch – Allows manual selection and control
of the air conditioning function.
7. Fan Control Switch – Allows manual selection
among five fan speeds.
8. Defogger Switch – Turns on the electric defogging
heater in the rear window and the outside rearview
mirrors, if the vehicle is equipped with heated mir-
rors.
Pressure Transducer
Pressure transducer switching incorporates the functions
of the high–pressure and the low–pressure cutout
switches along with the fan cycling switch. The pressure
transducer is located in the high–side liquid refrigerant line
behind the right strut tower, between the right strut tower
and the fire wall. The output from this pressure transducer
goes to the electronic control module (ECM), which con-
trols the compressor function based on the pressure sig-
nal.
Wide–Open Throttle (WOT) Compressor
Cutoff
During full–throttle acceleration, the throttle position sen-
sor (TPS) sends a signal to the ECM, which then controls
the compressor clutch.
High RPM Cutoff
As engine rpm approaches the maximum limit, the ECM
will disengage the compressor clutch until the engine
slows to a lower rpm.

9B – 26ILIGHTING SYSTEMS
DAEWOO V–121 BL4
Backup Lamps Inoperative
StepActionValue(s)YesNo
11. Block the wheels.
2. Apply the parking brake to prevent the vehicle
from moving.
3. Turn the ignition on.
4. Put the transaxle in reverse (R).
5. Remove one of the backup lamps from its
socket.
6. Test the lamp socket positive terminal with a
voltmeter.
Does the battery voltage available at the backup
lamp socket positive terminal equal the specified
value?11–14 vGo to Step 3Go to Step 2
2Repair the open circuit between fuse F20 and the
backup lamps.
Is the repair complete?–System OK–
3Connect an ohmmeter between ground and the neg-
ative terminal at the bulb socket.
Is the resistance equal to the specified value?0 WGo to Step 4Go to Step 5
4Replace the faulty backup lamps.
Is the repair complete?–System OK–
51. Reinstall the backup lamps.
2. Disconnect the electrical connector at the re-
verse switch. (On automatic transaxle (A/T)
vehicles, disconnect the neutral safety/backup
switch.)
3. Turn the ignition on.
4. Put the transaxle in R.
5. Use a voltmeter to check for the reverse switch
terminal 1. (On A/T vehicles, test terminal 7 of
the neutral safety/backup switch).
Does the battery voltage available at terminal 1 (or
terminal 7, if equipped with A/T) equal the specified
value?11–14 vGo to Step 7Go to Step 6
6Repair the open circuit between the backup lamps
and the, reverse switch (or the neutral safety/backup
switch if equipped with A/T).
Is the repair complete?–System OK–
71. Put the transaxle in R.
2. Use an ohmmeter to check the continuity be-
tween reverse switch terminal 1 and terminal 2
(terminals 7 and 8 on the neutral safety/backup
switch, if equipped with A/T).
Does the continuity between terminals 1 and 2 (ter-
minals 7 and 8, if equipped with A/T) equal the speci-
fied value?0 WGo to Step 9Go to Step 8

LITHING SYSTEMS 9B – 47
DAEWOO V–121 BL4
BACKUP LAMPS
The backup lamps are located in the rear combination
lamps They will come on when the transaxle is shifted into
reverse. On a vehicle with an automatic transaxle, the
backup lamps are activated by the neutral safety backup
(NSBU) switch. On a vehicle with a manual transaxle, they
are activated by a reverse switch which is part of the trans-
axle.

AUDIO SYSTEMS 9F – 11
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
STEREO CASSETTE AM/FM RADIO
There are three audio systems offered. The stereo digital
logic cassette AM/FM radio with electronic tape ejection
is offered in standard and deluxe models. Both models
feature RDS (radio data system) which automatically se-
lects the best station within the chain of RDS stations cur-
rently being listened to. A trunk mounted CD changer is
also available.
AUDIO SCURITY SYSTEM
The audio security system is activated whenever the audio
system circuit is disconnected from the battery. A four–
digit security code must be entered in order for the audio
system to resume functioning. The security code is
stamped on a card located in the vehicle (usually in the
glove box). The following security code entering proce-
dure must be used to deactivate the audio security sys-
tem:
1. After connecting the audio security system to the
battery, ”CODE” will flash on the display.
2. Enter the proper security number into the unit, us-
ing the preset buttons No. 1 through 8.
3. For example, if the security number is ”1234”:
a. Press the preset button No. 1. ”CODE” will
disappear and ”1 – – – ” will appear on the dis-
play.
b. Press the preset button No. 2, and ”12 – – ”
will appear.
c. Press the preset button No. 3, and ”123– ” will
appear.
d. Press the preset button No. 4, and ”1234” will
appear and flash three times.4. The audio system will function and will transfer to
the radio.
If the incorrect security number is entered into the unit,
”Err” will appear followed by ”CODE” and there will be sev-
eral audible beeps. If this happens, repeat the security en-
tering procedure beginning with Step 2.
SPEAKERS
All audio systems use eight speakers, four speakers and
four tweeters mounted in each door.
TAPE PLAYER AND CASSETTE
CARE
The head and the capstan are the two parts of the tape
player that should be cleaned. This service should be per-
formed every 100 hours of cassette operation.
To clean the head and the capstan, use a cotton swab
dipped in rubbing alcohol.
A cassette cleaning kit may also be used to clean the head
and the capstan. Follow the cleaning kit instructions to
clean the tape player.
Do not touch the tape head with magnetized tools. If the
head becomes magnetized, it will degrade cassettes
played in the player. No service is performed on the cas-
settes. The cassette manufacturer handles warranties of
the cassettes. Store cassettes away from extreme heat
and direct sunlight.
COMPACT DISC CARE
Handle discs carefully. Store the discs in protective cases
away from the sun, heat, and dust. If the surface is soiled,
dampen a clean, soft cloth in a solution of mild neutral de-
tergent and wipe the disc clean.

GLASS AND MIRRORS 9L – 19
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
STATIONARY GLASS
Stationary glass consists of all the glass on the vehicle
which is immovable within its frame, such as the wind-
shield glass, the back glass, and the inside rearview mir-
ror.
ELECTRIC CONTROL HEATED
OUTSIDE REARVIEW MIRROR
The electric control for the heated outside rearview mirroris on the driver’s side door. The mirror defogger is acti-
vated by the rear window defogger switch.
INSIDE REARVIEW MIRROR
The rearview mirror pivots at the ball–and–socket mirror
pivot and can be manually adjusted up/down and left/right.
FOLDING MIRROR UNIT
The folding mirror system is automatically folding the mir-
ror in parking state.

DOORS 9P – 29
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
DOOR LOCK STRIKER
The front and the rear door lock strikers each consist of a
striker with two screws threaded into a floating cage plate
in the B–pillars and the C–pillars. The door is secured in
the closed position when the door lock fork snaps over and
engages the striker.
CHILDPROOF REAR DOOR LOCK
The childproof rear door locks help prevent passengers,
especially children, from opening the rear doors of the ve-
hicle from the inside.
To activate the locks, move the levers of both rear doors
to the lock position. Then, close both doors. The rear pas-
sengers will be unable to open the doors from inside of the
vehicle.
To deactivate the locks, unlock the door from the inside of
the vehicle and open the door from the outside. Move the
lever to the unlock position. The rear door will now work
normally.
POWER DOOR LOCKS
The power door locks use a solenoid that is contained in
each door lock assembly. The door locks are activated by
the actuator on the inside door handle or by the lock cylin-
der on the driver’s side door only. When the driver’s side
door is locked or unlocked by the actuator or the lock cylin-
der, all doors are locked or unlocked accordingly.
POWER WINDOWS
The power windows are controlled by electrical switches
on the door panels and are operated by a motor at each
window regulator. Each door has a switch to control its
window, and the driver’s side door has four switches to
control all door windows on the vehicle. The windows are
lowered by pressing the switch and raised by pulling up on
the switch. The window will stop movement when the
switch is released or when the window is completely open
or closed.
The driver’s side window opens automatically. By pressing
and releasing the switch, the driver ’s side window will low-
er and will stop only when the switch is activated again, or
when the window is completely open.
The driver’s side door control also contains a window lock
button that will prevent the operation of the front passen-
ger door or the rear door windows when pressed.

REMOTE KEYLESS ENTRY AND ANTI–THEFT SYSTEM 9T1 – 7
DAEWOO V–121 BL4
REMOTE KEYLESS ENTRY
TRANSMITTER PROGRAMMING
The Remote Keyless Entry System allows for the use of
as many as four(4) transmitters for each vehicle. Replace-
ment Remote Keyless Entry System Transmitters must
first be programmend to specific vehicle using the
Scan100 Secan tool.
This process is completed using serial data communica-
tion between the Scan 100 Scan tool and the Remote Key-
less Entry Control Unit and is the only method available for
programming Transmitters.
Notice : All Transmitters for a specific vehicle must be pro-
grammed at same time.
Notice : Once the programming function of the Remote
Keyless Entry System is activated, any Transmitter(exist-
ing or new) that is not programmed(or reprogrammed)
during the programming procedure will no longer operate
the Remote Keyless Entry System of that vehicle.
Notice : Ensure that the doors, hood and trunk/rear hatch
are closed prior to starting the programming procedure.
1. Connect the Scan 100 Scan Tool to the Data Link
Connector(DLC)
2. Turn the Scan 100 Scan Tool ”ON” by pressing the
”Power” Button, then wait for the MAIN MENU
screen to be displayed.
3. From the MAIN MENU screen, select ”Diagnostics”
by pressing #1 on the Key Pad.
4. From the MODEL YEAR screen, select the ap-
propriate model year of the specific vehicle by ei-
ther scrolling down to the year and pressing ”EN-
TER”, or by pressing the respective item number on
the Key Pad.
5. From the VEHICLE TYPE screen, select the specif-
ic vehicle model by either scrolling down to the
model name and pressing ”ENTER”, or by pressing
the respective item number on the Key Pad.
6. From the SYSTEM SELECTION MENU screen,
select ”Body” by pressing #2 on the Key Pad.
7. From the BODY SELECTION MENU screen, select
”Coding” by pressing #2 on the Key Pad.8. From the CODY SELECTION MENU screen, select
”Coding” by pressing #1 on the Key Pad.
9. From the SECRET NUMBER OF CODINGS
screen, enter for(4) zero’s (0–0–0–0) in the for(4)
boxes labeled ”1–2–3–4–”.
10. From the CODING SYSTEM SELECT screen, se-
lect ”Keyless Entry” by pressing #2 on the Key Pad.
Notice : A slight delay may occur and ”PLEASE WAIT”
may be displayed before the next screen appears.
11. From the KEYLESS ENTRY CODING SYSTEM
screen, select ”Coding Transmitter” by pressing #1
on the Key Pad.
12. When directed by the Scan 100 Scan Tool, press
any Button on the first Transmitter to be pro-
grammed.
CAUTION : Ensure that Transmitters from other ve-
hicles in the immediate area are not activated during
this procedure.
13. Continue programming Transmitters when directed
by the Scan 100 Scan Tool until all Transmitters
have been programmed.
Notice : A maximum of four(4) Transmitters may be pro-
grammed to a vehicle.
14. Once all Transmitters have been programmed,
press the ”ESC” Button on the Key Pad. The dis-
play will confirm the number of Transmitters pro-
grammed. If the number displayed does not match
the number of Transmitters programmed, repeat
the procedure.
15. Turn the Scan 100 Scan Tool ”OFF” by pressing the
”POWER” Button, then disconnect it from the Data
Link Connector.
16. Wait approximately 10 seconds, then test the op-
eration of each programmed Transmitter to ensure
it operates properly.
The control module/receiver leaves the programming
mode automatically and switches to the normal operating
mode when either of the following conditions occurs:
S the scan tool is disconnected from the ALDL.
S Four passwords are recorded in the control module/
receiver.

9T1 – 8IREMOTE KEYLESS ENTRY AND ANTI–THEFT SYSTEM
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
REMOTE KEYLESS ENTRY AND
ANTI–THEFT SYSTEM
The remote keyless entry and anti–theft system can per-
form the following functions:
S Remotely lock and unlock the vehicle doors by
means of a hand–held, high–frequency transmitter.
S Sense intrusion into the vehicle.
S Activate a warning in the event of an intrusion.
S Help the driver find the vehicle in a parking area.
S Automatically re–lock the doors if the door or the
trunk is not opened within 30 seconds after the ve-
hicle has been unlocked by the remote keyless
entry.
S Communicate serial data to a scan tool to help
diagnose system faults.
The remote keyless entry and anti–theft system consists
of the following components:
S Keyless entry and anti–theft control module/receiv-
er.
S Security indicator.
S Trunk open switch (NOTCHBACK).
S Trunk tamper switch (NOTCHBACK).
S Front door tamper switches.
S Door contact switches.
S Central door lock relay.
S Turn signal bulbs.
S Siren.
S Hood open switch.
REMOTE LOCKING AND UNLOCKING
The hand–held transmitter locks and unlocks the vehicle
doors by sending radio waves to the control module/re-
ceiver in the vehicle. The effective range of the transmitter
varies between 5 and 10 meters, (approximately 16 to 32
feet), depending on whether or not objects, such as other
vehicles are blocking the path of the radio waves.
The transmitter has a LOCK button and an UNLOCK but-
ton which only function when the ignition is OFF. Pressing
the UNLOCK button has the following effects:
S The doors are unlocked.
S The turn signal bulbs flash twice.
S The control module is disarmed.
Pressing the LOCK button has the following effects:
S The doors are locked.
S The turn signal bulbs flash once.
S The control module is armed.
The transmitter has a replaceable battery. The battery is
designed to last at least two years before replacement is
necessary.
SECURITY INDICATOR
There is a security indicator on the instrument panel. After
the LOCK button of the transmitter is pressed, the module
is placed in the armed mode, and the security indicator
flashes. The security indicator turns ON for 0.1 second
and OFF for 0.7 second. It then flashes at that frequency
until the control module/receiver is disarmed.
INTRUSION SENSING
The anti–theft function is armed if the transmitter sends
the LOCK message to the control module/receiver when
the ignition is OFF. When the hood, door, or trunk is
opened, the hood open, door contact, or trunk open switch
sends a ”ground” signal to the control module/receiver.
Unless the control module/receiver is disarmed, the siren
will be activated when the ”ground” signal is received from
the trunk open, hood open, or door contact switches.
The following actions disarm the anti–theft system:
S An UNLOCK message is received from the trans-
mitter.
S Key operation is detected by the tamper switches.
(The tamper switches are operated by the lock cyl-
inders in the front doors and trunk.)
The alarm will also be activated if the control module/re-
ceiver detects voltage from the ignition before either of the
following conditions occur:
S An UNLOCK message is received from the trans-
mitter.
S Key operation is indicated by the tamper switches.
SIREN (GENERAL ONLY)
The remote keyless entry system is armed when the
LOCK message is received from the transmitter when the
ignition is OFF. When the system is armed, it will activate
the siren and flash the turn signals for 28 seconds if any
of the following conditions occur:
S Close all the windows.
S Turn the ignition key to LOCK and remove the key.
S Have all passengers get out of the vehicle.
S Close all doors, the hood and the turnk lid.
S The control module/receiver detects ignition voltage
while the system is armed.
The siren will not operate if any of the following conditions
occur after the system has been armed:
S The door is opened with the key.
S The trunk is opened with the key.
S The UNLOCK or LOCK button on the remote trans-
mitter is pressed within 2 seconds after the siren is
activated.
VEHICLE LOCATOR
The remote keyless entry system assists the driver in lo-
cating the vehicle. When the vehicle is unlocked with the
remote control, the turn signals flash twice to indicate the
location of the vehicle. The duration of the flashes and the