ground DAEWOO LACETTI 2004 Service Repair Manual

8B – 46ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B06
YEL
10AI/P
Fuse
Box
1 PNKC201
C207
SDM
BLK/
WHTF1
Hot in Run and Start
65 17
G202
DIAGNOSTIC TROUBLE CODE (DTC) 24
BATTERY VOLTAGE HIGE
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. But
if the voltage is out of range, SDM is unable to check the
airbag system properly.
DTC 24 Will Set When
S The voltage supplied from the battery is lower than
10.6 volts.

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 47
DAEWOO V–121 BL4
DTC 24
Battery Voltage 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
1Check the fuse F1. Is the fuse blown?–Replace the
fuse F1.Go to Step 2
21. Confirm the ignition switch ”ON”.
2. Check the voltage from the fuse F1. Is the volt-
age 10.6V?
10.6VGo to Step 4Go to Step 3
31. Repair the power supply and the wiring to the
fuse F1.–––
41. Confirm the ignition switch ”OFF”.
2. Disconnect the connector of clock spring.
3. Disconnect the connector of passenger airbag
module.
4. Disconnect the connector of SDM.
5. Confirm the ignition switch ”ON”.
6. Check the voltage between the terminal 5 of
SDM connector and the ground. Is the voltage
10.6V?
10.6VGo to Step 7Go to Step 5
51. Disconnect the C207.
2. Confirm the ignition switch ”ON”.
3. Check the voltage from the terminal 3 of C207.
Is the voltage 10.6V?
10.6VGo to Step 4Go to Step 3
6Repair the wire between the fuse F1 and the terminal
1 of connector C207.–––
7Replace the SDM.–––

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.–––

8B – 56ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B07
18191 2
SDM Driver
Side Airbag
ModulePassenger
Side Airbag
Module
WHT/
YEL
BLK/
WHTPNK/
WHTBRN/
WHT BLKDK GRN/
YEL
RED/
YEL WHT/
DK BLU DK GRN/
DK BLU
6
G202
20
1 1
2425C301
16
45
17
Driver
Side Airbag
Sensor12
21
1 246
Passenger
Side Airbag
Sensor
DIAGNOSTIC TROUBLE CODE (DTC) 52
DRIVER SIDE 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 the
driver low and the passenger low to detect shorts to
ground or voltage in the deploy loops.
DTC 52 Will Set When
S The resistance of driver side airbag deployment
loop is higher than 2.7 ohms.

8B – 58ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B07
18191 2
SDM Driver
Side Airbag
ModulePassenger
Side Airbag
Module
WHT/
YEL
BLK/
WHTPNK/
WHTBRN/
WHT BLKDK GRN/
YEL
RED/
YEL WHT/
DK BLU DK GRN/
DK BLU
6
G202
20
1 1
2425C301
16
45
17
Driver
Side Airbag
Sensor12
21
1 246
Passenger
Side Airbag
Sensor
DIAGNOSTIC TROUBLE CODE (DTC) 53
DRIVER SIDE 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.
DTC 53 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 .

8B – 60ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B07
18191 2
SDM Driver
Side Airbag
ModulePassenger
Side Airbag
Module
WHT/
YEL
BLK/
WHTPNK/
WHTBRN/
WHT BLKDK GRN/
YEL
RED/
YEL WHT/
DK BLU DK GRN/
DK BLU
6
G202
20
1 1
2425C301
16
45
17
Driver
Side Airbag
Sensor12
21
1 246
Passenger
Side Airbag
Sensor
DIAGNOSTIC TROUBLE CODE (DTC) 54
DRIVER SIDE 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.
DTC 54 Will Set When
S The side airbag wiring of driver’s high is shorted to
ground.
S The side airbag wiring of driver’s low is shorted to
ground.

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 61
DAEWOO V–121 BL4
DTC 54
Driver Side 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 the SDM charger to be dis-
charged.
3. Visually check any damage for the airbag wir-
ing. Is the airbag wiring damaged?–Go to Step 3Go to Step 2
21. Check the resistance between the SDM and
the high, low terminal of driver side airbag
module and the ground. Is the resistance
10KΩ?
10K ΩGo to Step 4Go to Step 3
3Replace the airbag wiring.–––
41. Replace the SDM.
2. Confirm the ignition switch ”ON”.
3. Remove the DTC with scan tool.
4. Check the circuit. Does the DTC still exist?–Go to Step 5The system is
OK.
5Replace the driver side airbag module.–––

8B – 62ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B07
18191 2
SDM Driver
Side Airbag
ModulePassenger
Side Airbag
Module
WHT/
YEL
BLK/
WHTPNK/
WHTBRN/
WHT BLKDK GRN/
YEL
RED/
YEL WHT/
DK BLU DK GRN/
DK BLU
6
G202
20
1 1
2425C301
16
45
17
Driver
Side Airbag
Sensor12
21
1 246
Passenger
Side Airbag
Sensor
DIAGNOSTIC TROUBLE CODE (DTC) 55
DRIVER SIDE 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 55 Will Set When
S The side airbag wiring of driver’s high is shorted to
battery wiring.
S The side airbag wiring of driver’s low is shorted to
battery wiring.

8B – 64ISUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO V–121 BL4
J3B18B07
18191 2
SDM Driver
Side Airbag
ModulePassenger
Side Airbag
Module
WHT/
YEL
BLK/
WHTPNK/
WHTBRN/
WHT BLKDK GRN/
YEL
RED/
YEL WHT/
DK BLU DK GRN/
DK BLU
6
G202
20
1 1
2425C301
16
45
17
Driver
Side Airbag
Sensor12
21
1 246
Passenger
Side Airbag
Sensor
DIAGNOSTIC TROUBLE CODE (DTC) 56
PASSENGER SIDE 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 cir-
cuit and verify the resistance.
DTC 56 Will Set When
S The resistance of passenger side airbag deploy-
ment loop is over 2.8 ohms.