DAEWOO LACETTI 2004 Service Repair Manual

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 17
DAEWOO V–121 BL4
DTC 3
Driver Airbag Deployment Loop Is Shorted To Ground
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 to discharge the SDM char-
ger.–Go to Step 2–
2Visually inspect the connector and the wiring of driv-
er airbag. Is the airbag wiring damaged?–Replace the
airbag wiring.Go to Step 3
31. Confirm the ignition switch ”OFF”.
2. Remove the driver airbag module.
3. Disconnect the connector of SDM wiring.
4. Check the resistance between the high, low
wiring of driver airbag module and the ground.
Is the resistance 10KΩ?10 KΩGo to Step 4Go to Step 5
41. Replace the SDM.
2. Confirm the ignition switch ”ON”.
3. Erase the DTC using scan tool.
4. Perform the SIR Diagnostic System Check.
5. If the DTC is not removable, then replace the
driver airbag module.–––
51. Remove the connector from the clock spring
wiring.
2. Check the resistance between the high, low
wiring of clock spring and the ground. Is the
resistance in the specification.?–Replace the
clock spring.Replace the
airbag wiring.

8B – 18ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B04
1 2
21
SDM Driver Airbag Module
Clock SpringDK GRN/
WHT
BLK/WHT
G202
10 11146
Passenger Airbag Module
BRN
BRNDK BLU
WHT/
BLK
DK BLU
13
12
DIAGNOSTIC TROUBLE CODE (DTC) 4
DRIVER AIRBAG DEPLOYMENT LOOP IS SHORTED TO
POWER
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.
DTC 4 Will Set When
S The airbag wiring of driver’s high is shorted to bat-
tery wiring.
S The airbag wiring of driver’s low is shorted to bat-
tery wiring.

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 19
DAEWOO V–121 BL4
DTC 4
Driver Airbag Deployment Loop Is Shorted To Power
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 to discharge the SDM char-
ger.–Go to Step 2–
2Visually inspect the connector and the wiring of driv-
er airbag. Is the airbag wiring damaged?–Replace the
airbag wiring.Go to Step 3
31. Confirm the ignition switch ”OFF”.
2. Remove the driver airbag module.
3. Disconnect the connector of SDM wiring.
4. Check the resistance between the high, low
wiring of driver airbag module and the battery.
Is the resistance 10KΩ?10 KΩGo to Step 4Go to Step 5
41. Replace the SDM.
2. Confirm the ignition switch ”ON”.
3. Erase the DTC using scan tool.
4. Perform the SIR Diagnostic System Check.
5. If the DTC is not removable, then replace the
driver airbag module.–––
51. Remove the connector from the clock spring
wiring.
2. Check the resistance between the high, low
wiring of clock spring and the battery. Is the
resistance 10KΩ?10 KΩReplace the
clock spring.Replace the
airbag wiring.

8B – 20ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B04
1 2
21
SDM Driver Airbag Module
Clock SpringDK GRN/
WHT
BLK/WHT
G202
10 11146
Passenger Airbag Module
BRN
BRNDK BLU
WHT/
BLK
DK BLU
13
12
DIAGNOSTIC TROUBLE CODE (DTC) 5
PASSENGER AIRBAG DEPLOYMENT LOOP
RESISTANCE IS HIGH
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 thedriver 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.
DTC 5 Will Set When
S The resistance of passenger airbag deployment
loop is over 2.8 ohms.

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 21
DAEWOO V–121 BL4
DTC 5
Passenger Airbag Deployment Loop Resistance Is High
CAUTION : The sensing and diagnostic module(SDM)
can maintain sufficient voltage to deploy the airbags
and pretensioners for 1minute 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
1Perform the SRS Diagnostic System Check.
Is the SRS Diagnostic System Check completed?–Go to Step 2–
2Visually inspect the connector and the wiring of pas-
senger airbag.
Is the connector disconnected?–Connect the
connector and
go to Step 1Go to Step 3
31. Confirm the ignition switch ”OFF”.
2. Remove the driver airbag module.
3. Disconnect the connector of SDM wiring.
4. Check the resistance between the terminal
13,14 of SDM and the terminal 1,2 of passen-
ger airbag module. Is the resistance about
0(zero)?
0KWGo to Step 4Replace the
airbag wiring.
41. Replace the SDM.
2. Confirm the ignition switch ”ON”
3. Erase the DTC using scan tool.
4. Perform the SIR diagnostic system check.
Is the DTC removed?–The System is
OK.Go to Step 5
51. Replace the passenger air bag module.
2. Perform the SIR Diagnostic System Check.
Is the DTC removed?–The System is
OK.–

8B – 22ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B04
1 2
21
SDM Driver Airbag Module
Clock SpringDK GRN/
WHT
BLK/WHT
G202
10 11146
Passenger Airbag Module
BRN
BRNDK BLU
WHT/
BLK
DK BLU
13
12
DIAGNOSTIC TROUBLE CODE (DTC) 6
PASSENGER AIRBAG DEPLOYMENT LOOP
RESISTANCE IS LOW
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.
DTC 6 Will Set When
S The resistance of driver airbag deployment loop is
lower than 1.4 ohms.
S The shorting bar is damaged and then the SDM
must be replaced .

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 23
DAEWOO V–121 BL4
DTC 6
Passenger Airbag Deployment Loop Resistance Is Low
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 to discharge the SDM char-
ger.–Go to Step 2–
2Visually inspect the connector and the wiring of driv-
er belt pretensioner. Is the wiring damaged?–Replace the
wiring.Go to Step 3
31. Confirm the ignition switch ”OFF”.
2. Disconnect the connector of driver belt preten-
sioner.
3. Disconnect the connector of SDM wiring.
4. Check the resistance between the terminal 1
and 2 of driver belt pretensioner. Is the resist-
ance ?ΩGo to Step 4Go to Step 5
41. Replace the SDM.
2. Confirm the ignition switch ”ON”.
3. Erase the DTC using scan tool.
4. Perform the SIR Diagnostic System Check.
5. If the DTC is not removable, then replace the
passenger airbag module.–––
5Replace the airbag wiring.–––

8B – 24ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B04
1 2
21
SDM Driver Airbag Module
Clock SpringDK GRN/
WHT
BLK/WHT
G202
10 11146
Passenger Airbag Module
BRN
BRNDK BLU
WHT/
BLK
DK BLU
13
12
DIAGNOSTIC TROUBLE CODE (DTC) 7
PASSENGER AIRBAG DEPLOYMENT LOOP IS SHORTED
TO GROUND
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 the
resistance is in the 2 kilo ohms between 10 kilo ohms, the
defect may occur depending upon SDM. The normal re-
sistance is over 10 kilo ohms.
DTC 7 Will Set When
S The airbag wiring of passenger’s high is shorted to
ground.
S The airbag wiring of passenger’s low is shorted to
ground.

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 25
DAEWOO V–121 BL4
DTC 7
Passenger Airbag Deployment Loop Is Shorted To
Ground
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 to discharge the SDM char-
ger.–Go to Step 2–
2Visually inspect the connector and the wiring of pas-
senger airbag. Is the airbag wiring damaged?–Replace the
airbag wiring.Go to Step 3
31. Confirm the ignition switch ”OFF”.
2. Remove the passenger airbag module.
3. Disconnect the connector of SDM wiring.
4. Check the resistance between the SDM and
the high, low wiring of passenger airbag mod-
ule and the ground. Is the resistance 10KΩ?10 KΩGo to Step 4Replace the
airbag wiring.
41. Replace the SDM.
2. Confirm the ignition switch ”ON”.
3. Erase the DTC using scan tool.
4. Perform the SIR Diagnostic System Check.
5. If the DTC is not removable, then replace the
passenger airbag.–––

8B – 26ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B04
1 2
21
SDM Driver Airbag Module
Clock SpringDK GRN/
WHT
BLK/WHT
G202
10 11146
Passenger Airbag Module
BRN
BRNDK BLU
WHT/
BLK
DK BLU
13
12
DIAGNOSTIC TROUBLE CODE (DTC) 8
PASSENGER AIRBAG DEPLOYMENT LOOP IS SHORTED
TO POWER
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 the
resistance is in the 2 kilo ohms between 10 kilo ohms, the
defect may occur depending upon SDM. The normal re-
sistance is over 10 kilo ohms.
DTC 8 Will Set When
S The airbag wiring of passenger’s high is shorted to
battery wiring.
S The airbag wiring of passenger’s low is shorted to
battery wiring.