DAEWOO LACETTI 2004 Service Repair Manual

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 27
DAEWOO V–121 BL4
DTC 8
Passenger 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 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 battery. 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 module.–––

8B – 28ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B05
341 2
SDM Driver
Pretensioner
ModulePassenger
Pretensioner
Module
PNKPNK/
DK BLUDK BLU/
WHT BLK/WHT PPL YEL/
DK BLUDK BLU/
WHTRED/
BLK
DK
BLU
G202 C301
126 1
2
38 76
DIAGNOSTIC TROUBLE CODE (DTC) 9
DRIVER BELT PRETENSIONER 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 9 Will Set When
S The resistance of driver belt pretensioner deploy
loop is over 3.1 ohms.

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 29
DAEWOO V–121 BL4
DTC 9
Driver Belt Pretensioner Deployment Loop Resistance Is
High
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
1Visually inspect the connector and the wiring of pas-
senger belt pretensioner. Is the connector discon-
nected?–Connect the
connector.Go to Step 2
21. Confirm the ignition switch ”OFF”.
2. Disconnect the connector of the passenger belt
pretensioner.
3. Disconnect the connector of SDM wiring.
4. Check the resistance between the terminal 1,2
of SDM and the terminal 1,2 of passenger belt
pretensioner. Is the resistance 10KΩ?10K ΩGo to Step 3Replace the
airbag wiring.
31. 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 belt pretensioner.–––

8B – 30ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B05
341 2
SDM Driver
Pretensioner
ModulePassenger
Pretensioner
Module
PNKPNK/
DK BLUDK BLU/
WHT BLK/WHT PPL YEL/
DK BLUDK BLU/
WHTRED/
BLK
DK
BLU
G202 C301
126 1
2
38 76
DIAGNOSTIC TROUBLE CODE (DTC) 10
DRIVER BELT PRETENSIONER 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 10 Will Set When
S The resistance of driver belt pretensioner deploy
loop is lower than 1.5 ohms.
S The shorting bar is damaged and then the SDM
must be replaced .

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 31
DAEWOO V–121 BL4
DTC 10
Driver Belt Pretensioner 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 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.
If the DTC is not removable, then replace the driver
belt pretensioner.–––

8B – 32ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B05
341 2
SDM Driver
Pretensioner
ModulePassenger
Pretensioner
Module
PNKPNK/
DK BLUDK BLU/
WHT BLK/WHT PPL YEL/
DK BLUDK BLU/
WHTRED/
BLK
DK
BLU
G202 C301
126 1
2
38 76
DIAGNOSTIC TROUBLE CODE (DTC) 11
DRIVER BELT PRETENSIONER 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 11 Will Set When
S The belt pretensioner wiring of driver’s high is
shorted to ground.
S The belt pretensioner wiring of driver’s low is
shorted to ground.

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 33
DAEWOO V–121 BL4
DTC 11
Driver Belt Pretensioner 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 air-
bag. Is the airbag wiring damaged?–Go to Step 3Go to Step 4
31. Replace the airbag wiring–––
4Check the resistance between the SDM and the
high, low wiring of driver belt pretensioner and the
ground. Is the resistance 10KΩ?
10K ΩGo to Step 5Replace the
airbag wiring.
51. 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 belt pretensioner.–––

8B – 34ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B05
341 2
SDM Driver
Pretensioner
ModulePassenger
Pretensioner
Module
PNKPNK/
DK BLUDK BLU/
WHT BLK/WHT PPL YEL/
DK BLUDK BLU/
WHTRED/
BLK
DK
BLU
G202 C301
126 1
2
38 76
DIAGNOSTIC TROUBLE CODE (DTC) 12
DRIVER BELT PRETENSIONER 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 12 Will Set When
S The belt pretensioner wiring of driver’s high is
shorted to battery wiring.
S The belt pretensioner wiring of driver’s low is
shorted to battery wiring.

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 35
DAEWOO V–121 BL4
DTC 12
Driver Belt Pretensioner 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 air-
bag. Is the airbag wiring damaged?–Replace the
airbag wiring.Go to Step 3
3Check the resistance between the SDM and the
high, low wiring of driver belt pretensioner and the
battery. Is the resistance 10KΩ?
10K ΩGo 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
driver belt pretensioner.–––

8B – 36ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B05
341 2
SDM Driver
Pretensioner
ModulePassenger
Pretensioner
Module
PNKPNK/
DK BLUDK BLU/
WHT BLK/WHT PPL YEL/
DK BLUDK BLU/
WHTRED/
BLK
DK
BLU
G202 C301
126 1
2
38 76
DIAGNOSTIC TROUBLE CODE (DTC) 13
PASSENGER BELT PRETENSIONER 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 13 Will Set When
S The resistance of passenger belt pretensioner
deploy loop is over 3.1 ohms.