2004 DAEWOO LACETTI Lamp

SECTION : 8B
SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
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 mujst be also be in LOCK unless otherwise noted
TABLE OF CONTENTS
SPECIFICATIONS8B–3 . . . . . . . . . . . . . . . . . . . . . . . . . .
General Specifications 8B–3. . . . . . . . . . . . . . . . . . . . .
Fastener Tightening Specifications 8B–3. . . . . . . . . . .
SPECIAL TOOLS8B–3 . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS TABLE 8B–3. . . . . . . . . . . . . . . . . . .
SCHEMATIC AND ROUTING DIAGRAMS8B–4 . . . . .
Supplemental Inflatable Restraints(SIR)
Electronical Schematic 8B–4. . . . . . . . . . . . . . . . . . . .
SIR Component Locator 8B–5. . . . . . . . . . . . . . . . . . . .
DIAGNOSIS8B–6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) 8B–6. . . . . . . . . . . . . .
Scan Tool Diagnostics 8B–7. . . . . . . . . . . . . . . . . . . . . .
SIR Diagnostic System Check 8B–8. . . . . . . . . . . . . . .
Sensing and Diagnostic Module (SDM) Integrity
check 8B–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC 1 Driver Airbag Deployment Loop Resistance
Is High 8B–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC 2 Driver Airbag Deployment Loop Resistance
Is Low 8B–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC 3 Driver Airbag Deployment Loop Is Shorted
To Ground 8B–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC 4 Driver Airbag Deployment Loop Is Shorted
To Power 8B–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC 5 Passenger Airbag Deployment Loop
Resistance Is High 8B–20. . . . . . . . . . . . . . . . . . . . . .
DTC 6 Passenger Airbag Deployment Loop
Resistance Is Low 8B–22. . . . . . . . . . . . . . . . . . . . . .
DTC 7 Passenger Airbag Deployment Loop Is
Shorted To Ground 8B–24. . . . . . . . . . . . . . . . . . . . . .
DTC 8 Passenger Airbag Deployment Loop Is
Shorted To Power 8B–26. . . . . . . . . . . . . . . . . . . . . . .
DTC 9 Driver Belt Pretensioner Deployment
Loop Resistance Is High 8B–28. . . . . . . . . . . . . . . . .
DTC 10 Driver Belt Pretensioner Deployment
Loop Resistance Is Low 8B–30. . . . . . . . . . . . . . . . . .
DTC 11 Driver Belt Pretensioner Deployment
Loop Is Shorted To Ground 8B–32. . . . . . . . . . . . . . . DTC 12 Driver Belt Pretensioner Deployment
Loop Is Shorted To Power 8B–34. . . . . . . . . . . . . . . .
DTC 13 Passenger Belt Pretensioner Deployment
Loop Resistance Is High 8B–36. . . . . . . . . . . . . . . . .
DTC 14 Passenger Belt Pretensioner Deployment
Loop Resistance Is Low 8B–38. . . . . . . . . . . . . . . . . .
DTC 15 Passenger Belt Pretensioner Deployment
Loop Is Shorted To Ground 8B–40. . . . . . . . . . . . . . .
DTC 16 Passenger Belt Pretensioner Deployment
Loop Is Shorted To Power 8B–42. . . . . . . . . . . . . . . .
DTC 23 Battery Voltage high 8B–44. . . . . . . . . . . . . . .
DTC 24 Battery Voltage Low 8B–46. . . . . . . . . . . . . . .
DTC 25 Airbag Warning Lamp Failure 8B–48. . . . . . .
DTC 31 Internal Sensing Diagnostic Module
(SDM) Failure 8B–50. . . . . . . . . . . . . . . . . . . . . . . . . .
DTC 32 Airbag Inflation Record By Frontal
Collision 8B–51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC 33 Driver Side Airbag Inflation Record By
Side Impact 8B–52. . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC 34 Passenger Side Airbag Inflation Record
By Side Impact 8B–53. . . . . . . . . . . . . . . . . . . . . . . . .
DTC 35 Belt Pretensioner Explosion Record 8B–54. .
DTC 38 Side Airbag And Belt Pretensioner
Explosion Count Over 5 8B–55. . . . . . . . . . . . . . . . . .
DTC 52 Driver Side Airbag Deployment Loop
Resistance Is High 8B–56. . . . . . . . . . . . . . . . . . . . . .
DTC 53 Driver Side Airbag Deployment Loop
Resistance Is Low 8B–58. . . . . . . . . . . . . . . . . . . . . .
DTC 54 Driver Side Airbag Deployment Loop Is
Shorted To Ground 8B–60. . . . . . . . . . . . . . . . . . . . . .
DTC 55 Driver Side Airbag Deployment Loop Is
Shorted To Power 8B–62. . . . . . . . . . . . . . . . . . . . . . .
DTC 56 Passenger Side Airbag Deployment Loop
Resistance Is High 8B–64. . . . . . . . . . . . . . . . . . . . . .
DTC 57 Passenger Side Airbag Deployment Loop
Resistance Is Low 8B–66. . . . . . . . . . . . . . . . . . . . . .
DTC 58 Passenger Side Airbag Deployment Loop
Is Shorted To Ground 8B–68. . . . . . . . . . . . . . . . . . . .
DTC 59 Passenger Side Airbag Deployment Loop
Is Shorted To Power 8B–70. . . . . . . . . . . . . . . . . . . . .

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

8B – 10ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
SENSING AND DIAGNOSTIC MODULE (SDM) INTEGRITY
CHECK
The following diagnostic chart must be used when all cir-
cuitry outside the sensing and diagnostic module (SDM)
has been found to operate properly, as indicated by follow-
ing the appropriate diagnostic trouble code(DTC) chart.
The chart verifies the need for SDM replacement.
Circuit Description
When the SDM recognizes ignition voltage greater than 9
volts at terminal A1 of the SDM, the airbag indicator
flashes seven times to verify operation. At this time the
SDM performs turn–on tests followed by resistance mea-surement tests and continuous monitoring tests.
When malfunction is detected, the SDM sets current DTC
and illuminates the airbag indicator.
When the malfuncation is no longer detected and/or the
ignition switch is cycled, the SDM will clear current DTCs
and move them to a history file, except for the DTCs 51
and sometimes 71. DTCs 51 will not be cleared by scan
tool because these codes require replacement of SDM.
The SDM must be replaced only after the malfunction that
set the DTC has been repaired.
Sensing and Diagnostic Module (SDM) Integrity Check
CAUTION : The sensing and diagnostic module
(SDM) can maimtain sufficient voltage to deploy the
airbags and pretensioners for 1 minute after the igni-
tion is OFF and the fuse has been removed. If the air-
bags and pretensioners are not disconnected, do not
begin service until one minute has passed after dis-
connecting the power to the SDM. Otherwise, injury
could result.
CAUTION : During service procedure, be very careful
when handling the SDM. Never strike or jar the SDM.Never power the supplemental inflatable re-
straints(SIR) when the SDM is not rigidlyattached to
the vehile. All SDM mounting bolts must be carefully
tightened , and the arrow on the SDM must be point
toward the front of the vehicle to ensure proper op-
eration of the SIR. The SDM could be activated if it is
powered when it is not rigidly attached to the vehicle,
resulting in unexpected deployment and possible in-
jury.
Step
ActionValue(s)YesNo
11. Turn the ignition to LOCK and remove the key
2. Connect all SIR components and ensure that
all the components are properly mounted.
3. Ensure that the ignition switch has been OFF
for at least 30 seconds.
4. Observe the airbag indicator as the ignition is
turned ON. Does the indicator lamp flashes
seven times ?–Clear the SIR
DTCs and
go to
”Diagnostic
System Check”Go to Step 2
21. Turn the ignition to LOCK and remove the key.
2. Connect the scan tool to DLC. Follow the direc-
tions given in the scan tool manual.
3. Turn the ignition to ON.
4. Request SIR DTC display with the scan tool. Is
the same DTC displayed that was previous oc-
curred when the SIR Diagnostic System Check
was previously performed?–Go to Step 3.Go to the table
for the DTC in-
dicated.
31. Clear SIR DTCs.
2. Turn the ignition OFF for at least 30 seconds.
3. Observe the airbag indicator as the ignition is
turned ON. Does the indicator lamp flashes
seven times ?–System OKGo to Step4
41. Turn the ignition to LOCK and remove the key.
2. Disconnect the SDM connector.
3. Replace the SDM.
4. Connect the SDM connector and ensure that
all components are properly mounted. Is the
repair complete?–Go to
”Diagnostic
System Check”–

8B – 48ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B03
LT BLU
LT BLU
”13” Ter.
DLC
(Data Link Connector) YEL YEL
10A
1C207 PNKPNKPNK
BLK/
WHTBRN
SDM F1
Hot in Run and Start
3
65
97 17
10A F4
32
B15
B7A19 31C201
G202
C207 4
DIAGNOSTIC TROUBLE CODE (DTC) 25
AIRBAG WARNING LAMP FAILURE
Circuit Description
When the ignition switch is turned to ON, the sensing and
diagnostic module(SDM) will perform turn–on test to diag-
nose critical malfunctions within SDM itself.
Upon passing these test ignition and deployment loop volt-
ages are measured to ensure that they are within their nor-
mal voltage ranges. The SDM monitors the voltages at the
driver low and the passenger low to detect shorts to
ground or voltage in the deploy loops.
The SDM checks the wiring connection to the passenger
airbag module by letting the infinitesimal current flow
through the internal circuit and verify the resistance. If thewarning lamp operates properly ”ON” and ”OFF”, SDM
checks the voltage continuously from the warning lamp
terminal.
DTC 25 Will Set When
S The warning lamp does not blinking properly ”ON”
and ”OFF”.
Reference
When the ignition switch is turned ON, in case of normal,
the warning lamp blinking 7 times during 7 seconds.
But in case, the warning lamp stays ”ON” or blinking a sec-
ond after above normal blinking(7 times during 7 sec-
onds), then it is regarded as a defect(old or current) pres-
ents. Please check the defect with scan tool.

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 49
DAEWOO V–121 BL4
DTC 25
Airbag Warning Lamp Failure
CAUTION : The sensing and diagnostic module(SDM)
can maintain sufficient voltage to deploy the airbags
and pretensioners for 1 minute after the ignition is
OFF and the fuse has been removed. If the airbags
and pretensioners are not disconnected, do not be-
gin service until one minute has passed after discon-
necting power to SDM. Otherwise, injury could result.
CAUTION : During service procedure, be very careful
when handling the SDM. Never strike or jar the SDM.Never power the supplemental inflatable re-
straints(SIR) when the SDM is not rigidly attached to
the vehicle. All SDM mounting bolts must be carefully
tightened , and the arrow on the SDM must be point
toward the front of the vehicle to ensure proper op-
eration of the SIR. The SDM could be activated if it is
powered when it is not rigidly attached to the vehicle,
resulting in unexpected deployment and possible in-
jury.
Step
ActionValue(s)YesNo
11. Confirm the ignition switch ”OFF”.
2. Wait for a minute the SDM charger to be dis-
charged.
3. Visually check any damage for the airbag wir-
ing. Is the airbag wiring damaged?–Replace the
airbag wiring.Go to Step 2
21. Check the resistance between the SDM and
the high, low terminal of driver side airbag
module and ground. Is the resistance 10KΩ–Go to Step 4Go to Step 3
3Repair the power supply and the wiring to the fuse
F4.–––
41. Confirm the ignition switch ”OFF”.
2. Remove the instrument cluster (or clock for
with tachometer).
3. Check the bulb of airbag warning lamp. Is the
bulb OK?–Go to Step 6Go to Step 5
5Replace the bulb of airbag warning lamp.–––
61. Confirm the ignition switch ”ON”.
2. Check the voltage from the terminal B15 from
the wiring connector of cluster.(or the terminal
A19 from the wiring connector of cluster). Is
the voltage in the range of 11~14V?
11~14VGo to Step 8Go to Step 7
7Repair the wire between the fuse F4 and the terminal
B15 from the wiring connector of cluster.(or the ter-
minal A19 from the wiring connector of cluster).–––
81. Check the connection between the terminal
B15 and B7 from the cluster(or the terminal
A19 and B7 from the cluster). Is the connection
OK?–Go to Step 10Go to Step 9
91. Replace the instrument cluster.–––
101. Confirm the ignition switch ”OFF”.
2. Remove the connector of passenger airbag
module and the connector of clock spring.
3. Remove the connector of SDM.
4. Confirm the ignition switch ”OFF”.
5. Check the voltage from the terminal 7 of SDM.
Is the voltage in the range of 11~14V?–Replace the
SDM.Go to Step 11
11Repair the wiring between the terminal 7 of SDM and
the instrument cluster.–––

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 51
DAEWOO V–121 BL4
J3B18B03
LT BLU
LT BLU
”13” Ter.
DLC
(Data Link Connector) YEL YEL
10A
1C207 PNKPNKPNK
BLK/
WHTBRN
SDM F1
Hot in Run and Start
3
65
97 17
10A F4
32
B15
B7A19 31C201
G202
C207 4
DIAGNOSTIC TROUBLE CODE (DTC) 32
AIRBAG INFLATION RECORD BY FRONTAL COLLISION
Circuit Description
When the ignition switch is turned to ON, the sensing and
diagnostic module(SDM) will perform turn–on test to diag-
nose critical malfunctions within SDM itself.
In case of airbag inflation by a vehicle collision, the SDMmaintains warning lamp ”ON” and then all the airbag sys-
tem including SDM, Airbag Module and wiring should be
replaced.
DTC 32 Will Set When
S The history of airbag inflation or belt pretensioner
explosion is in the SDM.
DTC 32
Airbag Inflation Record By Frontal Collision
CAUTION : The sensing and diagnostic module(SDM)
can maintain sufficient voltage to deploy the airbags
and pretensioners for 1 minute after the ignition is
OFF and the fuse has been removed. If the airbags
and pretensioners are not disconnected, do not be-
gin service until one minute has passed after discon-
necting power to SDM. Otherwise, injury could result.
CAUTION : During service procedure, be very carefulwhen handling the SDM. Never strike or jar the SDM.
Never power the supplemental inflatable re-
straints(SIR) when the SDM is not rigidly attached to
the vehicle. All SDM mounting bolts must be carefully
tightened , and the arrow on the SDM must be point
toward the front of the vehicle to ensure proper op-
eration of the SIR. The SDM could be activated if it is
powered when it is not rigidly attached to the vehicle,
resulting in unexpected deployment and possible in-
jury.