DAEWOO LACETTI 2004 Service Repair Manual

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 97
DAEWOO V–121 BL4
AIRBAG MODULE DEPLOYMENT
(OUTSIDE OF VEHICLE)
If the vehicle is within the warranty period, contact the
Daewoo regional service manager for approval or
special instructions before deploying the airbag mod-
ules.
Deploy airbag modules in following situations :
S If the vehicle is to be strapped. Refer to”Airbag
Module Deployment(Inside of Vehicle” in this sec-
tion.
S If an airbag module is damaged during transit, stor-
age or service.
CAUTION : To avoid injury while deploying an air-
bag or a pretensioner outside the vehicle, ob-
serve the following precaution :
S Deploy the airbags only in an evacuated area. Ser-
vice personnel who must be present during the de-
ployment should be at least 10 meters(33 feet) in
front of the vehicle.
S Do not connect the voltage source until after having
completed all other preparations for the deployment
of airbags.
S Allow a deployed airbag module or pretensioner
cool for 30 minutes before handling.
S Wear gloves and eye protection during the disposal
procedure.
S If the deployment fails, disconnect the voltage
source and wait 5 minutes before approaching the
vehicle.
1. Position the airbag module face up, on flat ground
outdoors, at least 10 meters(33 feet) from the any
obstacles or people.
2. Place a vehicle battery at least 10 meters(33 feet)
away from the airbag module.
3. Deploy the airbag module.
4. Please follow detailed Airbag Module deployment
procedure as below.
5. Cut the yellow wires to the airbag module/preten-
sioner.
6. Strip 13mm(0.5 inch) of the insulation from the end
of the wires leading to the airbag module/preten-
sioner.
7. Use two additional wires, each at least 10 me-
ters(33 feet) long, to reach from the deployment
battery to the airbag module/pretensioner.
8. Strip 13mm(0.5 inch) of the insulation from the
ends of these two additional wires.
9. Twist the two wires together at one end.
10. Place the twisted ends of the two wires near the
deployment battery. Do not connect the wires to the
battery at this time.

8B – 98ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
11. Using the free ends of the 10 meters(33 feet) wires
leading to the airbag module/pretensioner, make
two splices, one at each wires from the airbag mod-
ule/pretensioner.
12. Wrap the splices with insulating tape.
13. Now that the free ends of the 10 meters(33 feet)
wires are spliced to the airbag module/pretensioner
wires, and the ends that are twisted together are
near the deployment battery, clear the area.
14. Untwist the wires that near the deployment battery.
15. Touch one wire to the positive battery terminal and
touch the other wire to the negative battery termi-
nal. The airbag will deploy.
16. Using proper precautions, dispose of the deployed
airbags/pretensioners. Refer to ”Deployed Airbag
Module Disposal Procedure” in this section.
DEPLOYED AIRBAG MODULE
DISPOSAL PROCEDURE
CAUTION : After deployment, a powdery residue
may be on the surface of the airbag. The powder
primarily consists of cornstarch(used to lubri-
cate the bag as it inflates) and by–products of the
chemical reaction. The sodium hydroxide then
quickly reacts with atmospheric moisture and is
converted to sodium carbonate and sodium bi-
carbonate(also known as baking soda). There-
fore, it is unlikely that sodium hydroxide will be
presents after deployment.
CAUTION : Be sure to wear gloves and eye
protection during the disposal procedure.
CAUTION : After deployment, the metal surfaces
of the airbag module will be hot. In order to avoid
the risk of an injury or a fire do not place the
deployed airbag module near any flammable ob-
jects, and allow the airbag module to cool 30 min-
utes before handling.
Deploy an airbag or pretensioner before disposing of
it.
This includes those in a whole vehicle being
scrapped. If the vehicle is still within the warranty peri-
od contact the Daewoo regional service manager for
approval or special instructions before deploying an
airbag module or a pretensioner. Deployed airbag
module or pretensioner should be disposed of in the
same manner as other scrap parts, with the addition
of the following steps :
1. Place the deployed airbag or pretensioner in a
sturdy plastic bag.
2. Seal the plastic bag securely.
3. Wash your hands and rinse them with water after
handling a deployed airbag.

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 99
DAEWOO V–121 BL4
SIR WIRING REPAIR
Connector Repair
CAUTION : Before attempting any repairs, the SIR
must be disabled. Refer to ”Disabling the SIR”in
this section for instructions on how to disable the
SIR.
The terminals in the SIR are made of special metal to
provide necessary contact integrity for the sensitive,
low energy circuits. These terminals are available
only in connector repair assembly packs. Do not sub-
stitute any other terminals for those in the assembly
packs.
Wire Repair
CAUTION : Before attempting any repairs, the SIR
must be disabled. Refer to ”Disabling the SIR”in
this section for instructions on how to disable the
SIR.
Do not repair any wires of supplemental inflatable re-
straints(SIR). Replace any damaged wires with new
one.

8B – 100ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
SUPPLEMENTAL INFLATABLE
RESTRAINTS(SIR)
The supplemental inflatable restraints(SIR) is a safety de-
vice used in conjunction with the seat belt. The air bag
does not replace the fuction of the seatbelt. The driver and
the passengers must always fasten their seat belts and
adjust them for a proper fit.
The SIR is designed to protect the driver and the front seat
passenger in the event of a significant frontal impact to the
vehicle. The airbags deploy if the force is applied from a
direction within 30 degrees of the vehicle’s center line.
The SIR system consists of a
S Driver airbag module
S Driver side airbag module
S Passenger airbag module
S Passenger side airbag module
S Driver’s and front passenger’s seat belt pretension-
ers(and load limiter for some model).
S Sensing and diagnostic module(SDM)
S Clock spring.
S Wire harness and connectors.
S AIRBAG indicator on the instrument cluster.
S Side airbag sensor
AIRBAG MODULES
Driver Airbag Module
CAUTION : Tempering with driver airbag module
creates the risk of an injury from unexpected deploy-
ments. Therefore, the driver airbag module should
never be disassembled.
The driver airbag module is under the center pad of the
steering wheel. The driver airbag module contained an ig-
niter charge and a gas generator to inflate the folded air-
bag.The airbag connector contains a shorting bar, which
makes the circuit shorted when the connector is discon-
nected. The shorting bar prevents current from travelling
through the driver airbag module during servicing. The
shorting bar is disengaged when the connector is con-
nected.
Passenger Airbag Module
CAUTION : Tempering with passenger airbag module
creates the risk of an injury from unexpected deply-
ment. Therefore, the passenger airbag module
should never be disassembled. The passenger airbag
module is on the passenger part of the instrument
panel. The passenger airbag module contains an ig-
niter charge and a gas generator to inflate the folded
airbag .
The passenger airbag module is on the passenger part of
the instrument panel. The passenger airbag module con-
tains an igniter charge and a gas generator to inflate the
folded airbag .
The airbag connector contains a shorting bar, which
makes the circuit shorted when the connector is discon-
nected. The shorting bar prevents current from travelling
through the passenger airbag module during servicing.
The shorting bar is disengaged when the connector is con-
nected.
Side Airbag Module
CAUTION : Tempering with side airbag module
creates the risk of an injury from unexpected deploy-
ments. Therefore, the driver airbag module should
never be disassembled.
The side airbag modules are in the driver’s and passen-
ger’s seats. The side airbag module contains an igniter
charge and a gas generator to inflate the folded airbag .
The airbag connector contains a shorting bar, which
makes the circuit shorted when the connector is discon-
nected. The shorting bar prevents current from travelling
through the side airbag module during servicing. The
shorting bar is disengaged when the connector is con-
nected.

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 101
DAEWOO V–121 BL4
FRONT SEAT BELT
PRETENSIONERS
CAUTION : Tempering with seat belt pretensioner
creates the risk of an injury from unexpected deploy-
ment. Therefore, the driver airbag module should
never be disassembled.
The seat belt pretensioners(with load limiter for some ve-
hicles) are assembled with each front seat belt retractors
to retract the seat belt webbing when accounted frontal
collision. The seat belt pretensioners are controlled by
sensing and diagnostic module(SDM). The seat belt pre-
tensioner contains an igniter charge and a gas generator
to pull the seat belt webbing. The seat belt pretensioner
must be replaced after an accident that causes its activa-
tion.
The seat belt pretensioner also contains a shorting bar to
prevent current from travelling through the seat belt pre-
tensioner during servicing. The shorting bar is disengaged
when the connector is connected.
SENSING AND DIAGNOSTIC
MODULE (SDM)
CAUTION : During the service procedures, be careful
when handling the SDM. Never shake or jar the SDM.
Never apply power to SIR when the SDM is not rigidly
attached to the vehicle. All SDM mounting bolts and
grounding nuts must be fully tightened. Failure to fol-
low these precautions could cause deployment and
result in personal injury.
The SDM is located on the floor beneath the floor console
assembly. The SDM performs the following functions :
S Monitors the supplemental inflatable restraints(SIR)
electrical components and sets a diagnostic trouble
code(DTC) when malfunction is detected.
S Records any faults that are discovered.
S Displays SIR diagnostic trouble codes and system
status information when connected to a scan tool.
S Illuminates the airbag indicator to alert the driver to
any fault.S Provides a reserve power source to deploy the air-
bags and pretensioners if an accident has disabled
the normal power source.
S Monitors vehicle velocity changes to detect frontal
impacts, which are severe enough to warrant de-
ployment.
S Causes current to flow through the airbag modules
and pretensioner to cause deployment if a frontal
impact of sufficient force is detected.
The SDM contains no user–serviceable parts.
AIRBAG WARNING LAMP
The instrument cluster contains an airbag warning indica-
tor and sensing and diagnostic module(SDM). The SDM
performs a turn–on test when the ignition is turned ON.
The SDM flashes the airbag indicator seven times by sup-
plying an intermittent ground to the indicator lamp circuit.
After flashing seven times, the airbag indicator will turn off
if no more malfunctions have been detected.
If the SDM has detected malfunctions in the internal and
external circuits, which could potentially affect the opera-
tion of the supplemental inflatable restraints(SIR), the air-
bag indicator stays on. Some malfunctions could result in
non–deployment when necessary or deployment under
conditions which would not normally result in deployment.
When the SDM is not properly attached to its connector,
the airbag circuit is shorted to ground because there is a
shorting bar in the SDM electrical connector. The shorting
bar is disengaged when proper connection is made, but if
a poor connection exists the SDM connector supplied a
ground to the airbag indicator independently of the SDM,
and the airbag indicator turns on.
CLOCK SPRING
CAUTION : Disassembling the clock spring can cause
injury or cause the clock spring to malfunction.
CAUTION : Over–rotating the clock spring (over 3 and
one quarter turns to one direction) without the steer-
ing wheel in position could damage the clock spring
and result in an inoperative driver airbag.
There is a coil assembly in the steering which is referred
to as a clock spring because of its internal resemblance to
the type of spring used in a mechanical clock. The coil

8B – 102ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
spring should never be disassembled, and there is no
timekeeping function. The clock spring contains two or
three current–carrying coils. One of the current–carrying
coils maintains continuous contact within the driver de-
ployment loop while the steering wheel is rotated. The
clock spring also contains coils that maintain continuous
contact for horn and remote audio control switch circuit.
Turning the steering wheel in one direction tightens the
coil, and turning the steering wheel in the opposite direc-
tion loosens the coil. Do not turn the clock spring when the
steering wheel is not attached. Refer to ”Clock Spring” in
this section for proper installation of the clock spring.
The clock spring also includes the wiring and the connec-
tors for the horn circuit and the driver airbag circuit. A yel-
low two–way connector on the lower steering column is at-
tached to the clock spring wiring. The yellow connector to
the airbag contains a shorting bar which connects the driv-
er high circuit to driver low circuit when the connector is
disconnected.
The shorting bar prevents current from travelling through
the driver airbag module during servicing. The shorting bar
is disengaged when the clock spring connector is con-
nected.WIRING HARNESS CONNECTORS
If the sensing and diagnostic module (SDM) electrical con-
nector is not attached properly, a built in shorting bar will
connect the wire from airbag warning lamp with the SDM
ground wire. This turns on the airbag indicator . To prevent
deployment during servicing, additional shorting bars are
located in following locations :
S The clock spring electrical connector at the lower
steering column.
S The passenger airbag module.
S The driver airbag module.
S The seat belt pretensioners.
The shorting bar is only a backup safety device. Always
disable the supplemental inflatable restraints(SIR) before
beginning any service procedure.

SECTION : 9A
BODY WIRING SYSTEM
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
SCHEMATIC AND ROUTING DIAGRAMS9A–1 . . . . .
Wire Color Chart 9A–1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Distribution Schematic 9A–3. . . . . . . . . . . . . . .
Fuse Block Locator (Engine) 9A–12. . . . . . . . . . . . . . .
Fuse Block Locator (Passenger Compartment) 9A–12
Fuse Chart 9A–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Harness Routing 9A–15. . . . . . . . . . . . . . . . . . . .
Rear Harness Routing 9A–16. . . . . . . . . . . . . . . . . . . . .
Hatchback Rear Harness Routing 9A–17. . . . . . . . . . .
Floor Harness Routing 9A–18. . . . . . . . . . . . . . . . . . . .
Instrument Harness Routing 9A–19. . . . . . . . . . . . . . . .
Door Harness Routing 9A–20. . . . . . . . . . . . . . . . . . . . .
SCHEMATIC AND ROUTING DIAGRAMS
WIRE COLOR CHART
Wire ColorAbbreviation On Schematic
GreenDK GRN
Light GreenLT GRN
BlueDK BLU
BrownBRN
OrangeORN
YellowYEL
GreyGRY
Sky BlueLT BLU
RedRED
BlackBLK
PinkPNK
WhiteWHT
PurplePPL

9A – 2IBODY WIRING SYSTEM
DAEWOO V–121 BL4
Wires With Tracers
Wire ColorAbbreviation On Schematic
Red with White TracerRED/WHT
Red with Black TracerRED/BLK
Brown with White TracerBRN/WHT
Black with White TracerBLK/WHT
Black with Yellow TracerBLK/YEL
Green with Black TracerDK GRN/BLK
Green with White TracerDK GRN/WHT
Light Green with Black TracerLT GRN/BLK
Red with Yellow TracerRED/YEL
Red with Blue TracerRED/DK BLU
Black with Brown TracerBLK/BRN

BODY WIRING SYSTEM 9A – 3
DAEWOO V–121 BL4
POWER DISTRIBUTION SCHEMATIC

9A – 4IBODY WIRING SYSTEM
DAEWOO V–121 BL4