2004 DAEWOO LACETTI ACC

IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D – 33
DAEWOO V–121 BL4
SERVICEABLE COMPONENTS
COMMON HVAC COMPONENTS
Those components used in non–automatic systems are
covered in other sections of this manual.
Refer to Section 7A, Heating and Ventilation System for
the following procedures:
S Blower Motor.
S Heater Hoses.
S Blower Resistor.
S High–Blower Relay.
S Heater/Air Distributor Case Assembly (A/C Mod-
ule).
S Heater Core.
Refer to Section 7B, Manual Control Heating, Ventilation,
and Air Conditioning System, for the following proce-
dures:
S A/C Pressure Transducer.
S A/C Compressor Relay.
S Air Filter.
S A/C Expansion Valve.
S A/C High–Pressure Pipe Line.
S Evaporator Core.
S A/C Suction Hose Assembly.
S A/C Discharge Hose–Compressor to Condenser.
S Compressor.
S Condenser.
S Receiver–Dryer.
AUTOMATIC TEMPERATURE
CONTROL ASSEMBLY
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the center molding assembly. Refer to
Section 9E, Instrumentation/Driver Information.
3. Pull out the unit to gain access to the rear.
4. Disconnect the electrical connectors.
5. Remove the center molding assembly from the in-
strument panel.

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.

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.

SEAT BELTS 8A – 9
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
DRIVER SEAT BELT WARNING
The driver’s safety belt incorporates a safety belt reminder
light in the instrument cluster to remind the driver if the
safety belt is not fastened when the the ignition is turned
ON.
THREE–POINT ELR FRONT SEAT
BELT WITH PRETENSIONER
The three–point emergency locking retractor (ELR) front
seat belt pretensioner is always unlocked, allowing the
passenger freedom of movement, except in emergencies
such as rapid deceleration, rapid acceleration, or hard cor-
nering maneuvers.
The front seat belt pretensioner contains an ignitor charge
and a gas generator to inflate the pretensioner. The pre-
tensioner also includes wiring and a connector. The con-
nector of the pretensioner contains a shorting bar which
short–circuits the pretensioner high circuit to the preten-
sioner low circuit when the connector is disconnected. The
shorting bar prevents current from traveling through the
pretensioner during servicing. The shorting bar disen-
gaged when the connecotr is connected.
The pretensioner is an electronically controlled pyrotech-
nical reactor which reduce seat belt slack when it is actived
with air bags.
The front seat belt pretensioner must be replaced after an
accident that cause its activation.
THREE–POINT CLR (ELR) REAR
OUTBOARD SEAT BELT
The rear outboard seating positions use the three–point
child locking retractor (CLR) or emergency locking retrac-
tor (ELR) seat belts. The three–point CLR (ELR) seat beltis always unlocked, allowing the passenger freedom of
movement, except in emergencies such as rapid decel-
eration, rapid acceleration, or hard cornering maneuvers.
OPERATIONAL AND FUNCTIONAL
CHECKS
CAUTION :
S Keep sharp objects and potentially damaging
objects away from the seat belts.
S Avoid bending or damaging any portion of the
buckle or the latch plate.
S Do not bleach or dye the belt webbing. Use
only mild soap and water in order to clean the
belts.
S When installing the seat belt anchor bolts and
the screws, start the bolts and the screws by
hand in order to prevent cross–threading.
S Do not attempt any repairs on the retractor
mechanisms or the covers. Replace any defec-
tive assemblies with new assemblies.
S Replace any belts that are cut or damaged in
any way.
1. Inspect all seat belt anchor bolts and the screws in
order to verify that they are secure.
2. Inspect the seat belt buckle. The buckle must lock
and unlock easily.
3. After inserting the latch into the buckle, tug sharply
on the belt. The buckle must remain locked.
4. Fully extend the shoulder belt portion to make sure
that there is no twisting or tears in the belt.
5. Let the shoulder belt retract fully. The belt should
retract easily.
CHILD SEAT TETHER ANCHOR
For notch back vehicle, there are three child seat tether
anchors located on the read deck lid sill plate. For hatch
back vehicle, there are three child seat fether anchors on
the lower rear tail member in the luggage compartment.
And there are 4 lower child anchors under the rear seat.
4 circular discs on the rear seat indicate the location of the
lower child anchors.

8B – 2ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
DTC 80 Driver Side Airbag Sensor Loop Is
Shorted To Power 8B–72. . . . . . . . . . . . . . . . . . . . . . .
DTC 81 Driver Side Airbag Sensor Loop Is
Shorted To Ground 8B–74. . . . . . . . . . . . . . . . . . . . . .
DTC 82 Driver Side Airbag Sensor Communication
Error 8B–76. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC 83 Driver Side Airbag Sensor Failure 8B–78. . .
DTC 84 Passenger Side Airbag Sensor Loop Is
Shorted To Power 8B–80. . . . . . . . . . . . . . . . . . . . . . .
DTC 85 Passenger Side Airbag Sensor Loop Is
Shorted To Ground 8B–82. . . . . . . . . . . . . . . . . . . . . .
DTC 86 Passenger Side Airbag Sensor
Communication Error 8B–84. . . . . . . . . . . . . . . . . . . .
DTC 87 Passenger Side Airbag Sensor Failure 8B–86
MAINTENANCE AND REPAIR8B–88 . . . . . . . . . . . . . .
ON–VEHICLE SERVICE 8B–88. . . . . . . . . . . . . . . . . . . .
Disabling the Supplemental Inflatable
Restraints(SIR) 8B–88. . . . . . . . . . . . . . . . . . . . . . . . .
Enabling the Supplemental Inflatable
Restraints(SIR) 8B–88. . . . . . . . . . . . . . . . . . . . . . . . .
Handling, Installation and Diagnosis 8B–89. . . . . . . . .
Repairs and Inspections Required After an
Accident 8B–89. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accident With Deployment Components
Replacements 8B–90. . . . . . . . . . . . . . . . . . . . . . . . . . Accident Without Deployment Component
Inspection 8B–90. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sensing and Diagnostic Module (SDM) 8B–90. . . . . .
Driver Airbag Module 8B–91. . . . . . . . . . . . . . . . . . . . . .
Clock Spring 8B–92. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clock Spring Alignment 8B–93. . . . . . . . . . . . . . . . . . . .
Passenger Airbag Module 8B–94. . . . . . . . . . . . . . . . . .
Side Airbag Sensor 8B–95. . . . . . . . . . . . . . . . . . . . . . .
Front Seat Belt Pretensioner 8B–95. . . . . . . . . . . . . . .
Airbag Module Deployment (Inside of Vehicle) 8B–95
Airbag Module Deployment (Outside of Vehicle) 8B–97
Deployed Airbag Module Disposal Procedure 8B–98.
SIR Wiring Repair 8B–99. . . . . . . . . . . . . . . . . . . . . . . .
GENERAL DESCRIPTION AND SYSTEM
OPERATION8B–100 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supplemental Inflatable Restraints(SIR) 8B–100. . . .
Airbag Modules 8B–100. . . . . . . . . . . . . . . . . . . . . . . . . .
Front Seat Belt Pretensioners 8B–101. . . . . . . . . . . . .
Sensing and Diagnostic Module (SDM) 8B–101. . . . .
Airbag Warning Lamp 8B–101. . . . . . . . . . . . . . . . . . . .
Clock Spring 8B–101. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Harness Connectors 8B–102. . . . . . . . . . . . . . .

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 3
DAEWOO V–121 BL4
SPECIFICATIONS
GENERAL SPECIFICATIONS
ApplicationDescription
Airbag System Deployment Time<20ms
Detection Time<5ms
Operating Temperature–40°C~+85°C
Storage Temperature–40°C~+90°C
Voltage Range9~16 V
Current consumption5ms after ignition switch ON <1A
5ms
5sec<300Ma, after 5sec.<100Ma
Acceleration Range+/– 50g
Maximum Acceleration+/– 600g pulse
Voltage Ramp0.2~2.0 V/s
Energy Reservation150ms after battery disconnection
Inflator Ignition Energy4.3mj
Squib Resistance2.15 +/– 0.35Ω
Airbag Warning Lamp ON Time(When Ignition ON)6sec
FASTENER TIGHTENING SPECIFICATIONS
ApplicationN·mLb–FtLb–In
Clock Spring Retaining Screws3–27
Driver Airbag Module Mounting Bolts11–97
Passenger Airbag Module Mounting Bolts8–71
Sensing and Diagnostic Module(SDM) Mounting Bolts10–89
SPECIAL TOOLS
SPECIAL TOOLS TABLE
Scan Tool

8B – 6ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
DIAGNOSIS
DIAGNOSTIC TROUBLE CODE (DTC)
When the sensing and diagnostic module (SDM) detects
any problem it illuminates the airbag warning indicator and
stores the diagnostic trouble codes (DTCs).
The supplemental inflatable restraints (SIR) diagnostic
system check must be always the starting point for any
SIR diagnosis. The diagnostic system check reveals diag-
nostic trouble codes (DTCs) through the use of scan tool.
It also checks for proper airbag warning lamp operation.
The two types of DTCs that may be recorded are as fol-lows :
1. Active DTCs represent malfunction being detected
during the current ignition cycle. Active DTCs are
stored in random access memory (RAM).
2. Historic DTCs represent malfunctions detected sin-
cethe last time the historic memory was cleared.
Historic DTCs are stored in the electrically erasable
programmable read–only memory (EPROM).
Diagnostic Trouble Code Table
DTCDescription
1Driver Airbag Deployment Loop Resistance Is High
2Driver Airbag Deployment Loop Resistance Is Low
3Driver Airbag Deployment Loop Is Shorted To Ground
4Driver Airbag Deployment Loop Is Shorted To Power
5Passenger Airbag Deployment Loop Resistance Is High
6Passenger Airbag Deployment Loop Resistance Is Low
7Passenger Airbag Deployment Loop Is Shorted To Ground
8 Passenger Airbag Deployment Loop Is Shorted To Power
9Driver Belt Pretensioner Deployment Loop Resistance Is High
10Driver Belt Pretensioner Deployment Loop Resistance Is Low
11Driver Belt Pretensioner Deployment Loop Is Shorted To Ground
12 Driver Belt Pretensioner Deployment Loop Is Shorted To Power
13Passenger Belt Pretensioner Deployment Loop Resistance Is High
14Passenger Belt Pretensioner Deployment Loop Resistance Is Low
15Passenger Belt Pretensioner Deployment Loop Is Shorted To Ground
16Passenger Belt Pretensioner Deployment Loop Is Shorted To Power
23Battery Voltage High
24 Battery Voltage Low
25 Airbag Warning Lamp Failure
31Internal Sensing Diagnostic Module(SDM) Failure
32 Airbag Inflation Record By Frontal Collision
33 Driver Side Airbag Inflation Record By Side Impact
34Passenger Side Airbag Inflation Record By Side Impact
35Belt Pretensioner Explosion Record
38Side Airbag And Belt Pretensioner Explosion Count Over 5
52 Driver Side Airbag Deployment Loop Resistance Is High
53Driver Side Airbag Deployment Loop Resistance Is Low
54Driver Side Airbag Deployment Loop Is Shorted To Ground
55 Driver Side Airbag Deployment Loop Is Shorted To Power
56Passenger Side Airbag Deployment Loop Resistance Is High

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 89
DAEWOO V–121 BL4
HANDLING, INSTALLATION AND
DIAGNOSIS
S Airbag modules should not be subjected to temper-
ature above 65 degrees Celsius(149 degrees Fahr-
enheit).
S An airbag and SDM should not be used if it has
been dropped from height of 0.9 meters(3 feet) or
greater.
S When an SDM is replaced, it must be oriented with
the arrow on the SDM pointing toward the front of
the vehicle.
S It is very important for the SDM to be installed flat
on the mounting surface, parallel to the vehicle’s
longitudinal axis.
S To avoid setting diagnostic trouble codes(DTCs), do
not apply power to the SIR unless all components
are connected or a diagnostic chart request it.
S The SIR Diagnostic System Check must be the
starting point of any SIR diagnostics. The SIR Diag-
nostic System Check will verify proper airbag indi-
cator operation and will lead you to correct chart to
diagnose any SIR malfunctions. Bypassing these
procedures may result in extended diagnostic time
incorrect parts replacement.
REPAIRS AND INSPECTIONS
REQUIRED AFTER AN ACCIDENT
CAUTION : Any repairs to the vehicle’s structure
must return it to the original production configu-
ration. Deployment requires replacement of
SDM, the inflator modules and a dimensional in-
spection of the steering column.
S If any SIR components are damaged, they must be
replaced. If SIR components mounting points are
damaged, they must be repaired or replaced.
S Never use SIR parts from another vehicle. This
does not include remanufactured parts purchased
from an authorized source.
S Do not attempt to service the SDM, the clock spring
or other airbag modules, these items must be re-
placed if they are defective.
S Verify the part number of replaced airbag modules.
Some inflator modules look identical but contain
different internal components.