DAEWOO LACETTI 2004 Service Repair Manual

7D – 36IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO V–121 BL4
WATER SENSOR
(Left–Hand Drive Shown, Right–Hand Drive
Similar)
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the instrument panel under cover. Refer to
Section 9G, Interior Trim.
3. Disconnect the electrical connector.
4. Remove the sensor retaining screw.
5. Remove the sensor.
Installation Procedure
1. Install the sensor with the retaining screw.
2. Connect the electrical connector.
3. Install the instrument panel under cover. Refer
toSection 9G, Interior Trim.
4. Connect the negative battery cable.
AMBIENT AIR TEMPERATURE
SENSOR
Removal Procedure
1. Disconnect the negative battery cable.
2. Disconnect the ambient air temperature sensor
electrical connector.
3. Remove the ambient air temperature sensor from
the bracket.
Installation Procedure
1. Install the ambient air temperature sensor into its
bracket.
2. Connect the electrical connector.
3. Connect the negative battery cable.

IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D – 37
DAEWOO V–121 BL4
IN–CAR TEMPERATURE SENSOR
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the instrument panel under cover. Refer to
Section 9G, Interior Trim.
3. Disconnect the electrical connector.
4. Remove the tube by turning it clockwise.
5. Remove the screws.
6. Remove the in–car sensor with the tube.
Installation Procedure
1. Install the in–car sensor.
2. Install the in–car sensor retaining screws and tight-
en.
3. Install the air inlet tube and connect the electrical
connector.
4. Install the instrument panel under cover. Refer to
Section 9G, Interior Trim.
5. Connect the battery negative cable.
SUN SENSOR
Removal Procedure
1. Disconnect the negative battery cable.
2. Gently pry up on the sun sensor to remove it.
3. Secure the electrical connector to prevent it from
falling beneath the dash.
4. Disconnect the electrical connector and remove the
sun sensor.

7D – 38IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO V–121 BL4
Installation Procedure
1. Connect the electrical connector.
2. Insert and press the sun sensor into position in the
dash.
3. Connect the negative battery cable.

IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D – 39
DAEWOO V–121 BL4
UNIT REPAIR
V5 AIR CONDITIONING COMPRESSOR OVERHAUL
COMPRESSOR OVERHAUL
Refer to Section 7B, Manual Control Heating, Ventilation,
and Air Conditioning System for details of the following
procedures:
S Clutch Coil.
S Clutch Plate and Hub Assembly.
S Clutch Rotor and Bearing.
S Component Locator V5 Compressor.
S Control Valve Assembly.
S Cylinder to Front Head O–Ring.
S Leak Testing (External).
S Pressure Relief Valve.
S Rear Head, Gasket, Valve Plate, Reed Plate, and
O–Ring.
S Shaft Seal Replacement.

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.

SECTION : 8A
SEAT BELTS
CAUTION : Disconnect the negative battery cable before removing or installing any electrical unit or when a tool
or equipment could easily come in contact with exposed electrical terminals. Disconnecting this cable will help
prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless otherwise noted.
TABLE OF CONTENTS
SPECIFICATIONS8A–1 . . . . . . . . . . . . . . . . . . . . . . . . . .
Fastener Tightening Specifications 8A–1. . . . . . . . . . .
SCHEMATIC AND ROUTING DIAGRAMS8A–2 . . . . .
Driver Seat Belt Warning 8A–2. . . . . . . . . . . . . . . . . . . .
DIAGNOSIS8A–3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Seat Belt Warning 8A–3. . . . . . . . . . . . . . . . . . . .
MAINTENANCE AND REPAIR8A–4 . . . . . . . . . . . . . . .
ON–VEHICLE SERVICE 8A–4. . . . . . . . . . . . . . . . . . . . .
Pretensioner Front Seat Belt 8A–4. . . . . . . . . . . . . . . .
Front Seat Belt Height Adjuster 8A–5. . . . . . . . . . . . . . Three–Point Rear Seat Belt (LH,CENTER, RH) 8A–6
Front Seat Belt Buckle 8A–7. . . . . . . . . . . . . . . . . . . . .
GENERAL DESCRIPTION AND SYSTEM
OPERATION 8A–9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Seat Belt Warning 8A–9. . . . . . . . . . . . . . . . . . . .
Three–Point ELR Front Seat Belt With
Pretensioner 8A–9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Three–Point CLR (ELR) Rear Outboard Seat
Belt 8A–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operational and Functional Checks 8A–9. . . . . . . . . .
Child Seat Tether Anchor 8A–9. . . . . . . . . . . . . . . . . . .
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
ApplicationNSmLb–FtLb–In
Child Seat Tether Anchor Bolt2518–
Front Seat Belt Height Adjuster Bolts2317–
Seat Belt Anchor Bolt3828–
Seat Belt Retractor Bracket Screws3–27
Seat Belt Retractor Bolt3828–

8A – 2ISEAT BELTS
DAEWOO V–121 BL4
SCHEMATIC AND ROUTING DIAGRAMS
DRIVER SEAT BELT WARNING

SEAT BELTS 8A – 3
DAEWOO V–121 BL4
DIAGNOSIS
DRIVER SEAT BELT WARNING
Seat Belt Warning Lamp Does Not Turn On at Any Time
StepActionValue(s)YesNo
1Check the seat belt warning fuse F4.
Is fuse F4 blown?–Go to Step 2Go to Step 3
21. Check for a short circuit and repair if neces-
sary.
2. Replace the fuse.
Is the repair complete?–System OK–
31. Turn the ignition ON.
2. Check the voltage at fuse F4.
Is the voltage equal to the specified value?11–14 vGo to Step 5Go to Step 4
4Repair the open power supply circuit for fuse F4.
Is the repair complete?–System OK–
51. Disconnect the seat belt switch connector (lo-
cated under the driver’s seat).
2. Connect a jumper between the terminals on the
harness side of the seat belt switch connector.
3. Turn the ignition ON.
Does the seat belt warning lamp turn on?–Go to Step 6Go to Step 7
6Replace the seat belt switch.
Is the repair complete?–System OK–
71. Remove the instrument cluster.
2. Check the seat belt warning lamp bulb.
Is the bulb OK?–Go to Step 9Go to Step 8
8Replace the warning lamp bulb.
Is the repair complete?–System OK–
9Repair the open circuit between instrument cluster
terminal A11 and ground.
Is the repair complete?–System OK–

8A – 4ISEAT BELTS
DAEWOO V–121 BL4
MAINTENANCE AND REPAIR
ON–VEHICLE SERVICE
PRETENSIONER FRONT SEAT BELT
Removal Procedure
1. Remove the plastic cap to reveal the lower B–pillar
seat belt anchor.
2. Remove the bolt and the lower B–pillar seat belt
anchor.
3. Remove the lower B–pillar trim panel. Refer to Sec-
tion 9G, Interior Trim.
4. Remove the plastic cap to reveal the upper B–pillar
seat belt anchor.
5. Remove the bolt and the upper B–pillar seat belt
anchor.
6. Remove the screws from the seat belt retractor
bracket.
7. Remove the bolt and the seat belt retractor.

SEAT BELTS 8A – 5
DAEWOO V–121 BL4
Installation Procedure
CAUTION : Failure to install the correct retractor
screw can cause the pretensioner seat belt to mal-
function in an accident, possibly resulting in person-
al injury.
Notice : Dissimilar metals in direct contact with each other
may corrode rapidly. Make sure to use the correct fasten-
ers to prevent premature corrosion.
1. Install the seat belt retractor with the bolt.
Tighten
Tighten the seat belt retractor bolt to 38 NSm (28 lb–
ft).
2. Install the seat belt retractor bracket with the screw.
Tighten
Tighten the seat belt bracket screw to 3 NSm (27 lb–
in).
3. Install the upper B–pillar seat belt anchor with the
bolt.
Tighten
Tighten the seat belt anchor bolt to 38 NSm (28 lb–ft).
4. Install the seat belt anchor plastic cap.
5. Install the lower B–pillar trim panel. Refer to Sec-
tion 9G, Interior Trim.
6. Install the lower B–pillar seat belt anchor with the
bolt.
Tighten
Tighten the seat belt anchor bolt to 38 NSm (28 lb–ft).
7. Install the seat belt anchor plastic cap.
FRONT SEAT BELT HEIGHT
ADJUSTER
Removal Procedure
1. Remove the upper B–pillar trim panel. Refer to
Section 9G, Interior Trim.
2. Remove the bolts and the seat belt height adjuster.