DAEWOO MATIZ 2003 Service Repair Manual

8B–4 SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO M-150 BL2
If there is a failure of the sensing and diagnostic module
or the external circuits, the SIR warning lamp in the in-
strument cluster turns ON.
As a system check, the SIR warning lamp also turns ON
when the ignition is first switched to the ON position.
Correct Functioning
The system is working properly if:

The SIR warning lamp turns OFF after approximately
four seconds.
Faulty Functioning
The system is not working properly, meaning one of the
SIR components or the wiring connector is faulty, if:

The SIR warning lamp fails to turn ON when the
ignition is first switched ON.

The SIR warning lamp remains ON.
D110B009A
CLOCK SPRING
The clock spring:

Is on the steering column.

Contains a coil that is the electrical contact between
the steering column wiring harness and the driver
side airbag module.

Is part of the circuit for the horn.
Notice: Turning the steering wheel more than three and
one-quarter turns may damage the clock spring.
Turning the steering wheel:

In one direction tightens the coil.

In the opposite direction loosens the coil.

More than three and one-quarter turns may damage
the clock spring.
Caution: Disassembling the clock spring can cause
injury and vehicle damage.The clock spring should never be disassembled.
The clock spring must be replaced if the airbags have
been deployed.
D110B008A
WIRING HARNESS/CONNECTORS
The connector for the sensing and diagnostic module
(SDM) has a built-in shorting bar that will turn ON the
warning lamp if there is a poor connection at the SDM.
As an anti-deployment mechanism, additional shorting
bars are in the

Connector for the clock spring at the lower steering
column.

Passenger airbag module connector.

SDM connector.
When these connectors are separated, the shorting
bars will short circuit any current which is applied, pre-
venting the current from reaching the airbag modules.
SIR SYSTEM
The supplemental inflatable restraints (SIR) system is a
safety device used in conjunction with the seat belts.
The airbag does not replace the function of the seat belt.
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 im-
pact to the vehicle. The airbags deploy if the force is ap-
plied from a direction within 30 degrees of the vehicle’s
centerline and above 25 km/h (15 mph) speed.
The SIR consists of a

Driver airbag module.

Passenger airbag module.

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B–5
DAEWOO M-150 BL2

Sensing and diagnostic module.

Steering column clock spring.

Wiring harness.

SIR malfunction warning lamp.
D110B001
GENERAL PRECAUTIONS
The supplemental inflatable restraints (SIR) warning
lamp must illuminate when the ignition is switched ON,
and then turn OFF after approximately 4 seconds.
There is a fault in the airbag system if

The warning lamp does not turn OFF.

The warning lamp illuminates while the vehicle is in
operation.If the warning lamp indicates there is a fault in the airbag
system, assume that the SIR system may not be
functional.
Caution: Failure to follow all service procedures in
the correct sequence can cause the airbag system to
deploy unexpectedly and possibly cause a serious
injury.
Only trained personnel at franchised Daewoo dealers
and authorized Daewoo service dealerships may service
the airbag system.
Never attempt to disassemble, repair, or reuse the

Airbag modules.

Clock spring.

Sensing and diagnostic module.

Wiring harness.
When making SIR repairs,

Inspect any SIR part before it is installed.

Use only new parts.

Do not install used SIR parts from other vehicles.

Do not install any part that has been dropped or that
has dents, cracks, or other defects.
AIRBAG DEPLOYMENT CONDITION
Airbag is designed to deploy under 30 left/right angle
barrier and above 25 km/h (15 mph) speed.
Concrete Barrier Deployment Condition
In case of the 0 frontal concrete battier, airbag may
deploy above 25 km/h (15 mph) speed.

8B–6 SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO M-150 BL2
D110B002
AIRBAG DEPLOYMENT PROCEDURE
1. Non–Deployment condition
a. Initiator
b. Piston
c. Safety disc
d. Compressed Ar gas
D110B003
2. When crashing, firing current flows from the SDM to
the initiator.
3. Initiator is burning and the inside pressure is increas-
ing and the piston hits the safety disc.
D110B004
4. Safety disc is broken and the compressed Ar gas is
spouted out.
D110B005
5. Compressed Ar gas and the burned initiator are car-
bureted. And the airbag is deployed.

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B – 7
DAEWOO M-150 BL2
COMPONENT LOCATOR
SIR COMPONENT
(Left–Hand Drive Shown, Right–Hand Drive Similar)
D110B401
1. Driver Airbag Module
2. Passenger Airbag Module
3. Clock Spring4. Sensing and Diagnostic Module (SDM)
5. Wiring Harness

8B–8 SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO M-150 BL2
DIAGNOSTIC INFORMATION AND PROCEDURES
D110B009A
BULB CHECK
As soon as the operating voltage is applied to the sens-
ing and diagnostic module (SDM) ignition input, the
SDM activates the warning lamp for a bulb check.
The SDM turns the lamp ON for 4 seconds, and then the
SDM turns the lamp OFF.
During the bulb check, the SDM is not ready to detect a
crash or deploy the supplemental inflatable restraints.
FAULT INDICATION
The sensing and diagnostic module records the sys-
tem’s faults in two categories:

Current faults and the fault code appears “Axx” on the
scan tool display.

Historic faults, which are those that were detected in
the past, but are no longer active. And the fault code
appears “Sxx” on the scan tool display.
The warning lamp:

Indicates a fault as soon as it occurs.

Stays ON, even if a fault is no longer active.A scan tool connected to the data link connector (DLC):

Reveals the fault codes.

Receives serial data transmission through the termi-
nal J (13) of the DLC.

Receives ground through the terminal A (4) of the
DLC.
CLEARING FAULT CODES
When the sensing and diagnostic module (SDM) re-
ceives the CODE ERASE command from the scan tool,
the SDM:

Clears the entire fault memory.

Turns OFF the warning lamp.

Resets for fault detection.
External Fault
Service personnel can reset the SDM and turn OFF the
warning lamp if the fault is an external fault.
Internal Fault
An internal fault of the SDM or a CRASH RECORDED
fault code cannot be reset.
In the case of an internal fault of the SDM or a CRASH
RECORDED fault code, the SDM must be replaced.
Voltage-Low Fault
The SDM will turn OFF the VOLTAGE LOW fault as
soon as the voltage recovers.
MICROPROCESSOR –
INDEPENDENT LAMP ACTIVATION
If the sensing and diagnostic module (SDM) electrical
connector is not properly attached, the SDM cannot
function and cannot control the warning lamp.
If this fault is present, the warning lamp will operate in-
dependently from the SDM through the use of shorting
bars that are built into the SDM connector.

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B–9
DAEWOO M-150 BL2
BLANK

8B–10 SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO M-150 BL2
SYSTEM CHECK
D1AB301B
Caution: Use only the scan tool to check the airbag
modules and the sensing and diagnostic module
(SDM). Never measure the resistance of an airbag
module with an ohmmeter. An ohmmeter’s battery
can deploy the airbag and cause injury.
Caution: Before testing, disconnect the negative
battery cable. Wait 1 minute for the SDM capacitor
to discharge. The capacitor supplies reserve power
to deploy the airbags, even if the battery is discon-
nected. Unintentional deployment of the airbags
can cause injury.Caution: Do not attempt to repair the supplemental
inflatable restraints (SIR) wiring harness. An SIR re-
pair can create a high-resistance connection which
can keep the airbags from deploying when needed,
resulting in injury.
Circuit Description
When the ignition switch is turned ON, the SDM is able
to send serial data from the terminal 9 of the SDM to the
terminal J (13) of the assembly line diagnostic link.
Diagnostic System Check
Step Action Value(s) Yes No



1



1. Turn the ignition ON.
2. Check the warning lamp.
Does the warning lamp turn off after 4 seconds?

–


System OK


Go to Step 2






2






1. Connect the scan tool cable to the DLC.
2. Connect the scan tool power cable to the cigar
lighter socket.
3. Select the airbag main menu on the scan tool.
4. Select “Fail Code View & Clear “ from the
displayed menu of the diagnostic test codes
(DTC).
Are there any active fault codes?




–






Go to the DTC
table for the
fault indicated





Go to Step 3

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B–11
DAEWOO M-150 BL2
Diagnostic System Check (Cont’d)
Step Action Value(s) Yes No

3

1. Check fuse F2.
Is the fuse F2 blown?
–

Go to Step 4

Go to Step 5
4 1. Replace fuse F2.
Is the repair complete? – System OK –



5




1. Disconnect the electrical connector C208.
2. Check for a short to ground between fuse F2 and
terminal 2 of connector C208.
Is wiring harness shorted to ground?


–



Go to Step 6



Go to Step 7

6

Repair a short to ground between fuse F2 and
terminal 2 of connector C208.
Is the repair complete?
–

System OK

–

7



1. Disconnect the SDM electrical connector.
2. Check for a short to ground between terminal 2
and terminal 5 of SDM connector.
Is wiring harness shorted to ground?


–



Go to Step 15



Go to Step 8

8



Use an ohmmeter to check for continuity between
terminal A (4) of the DLC and ground G201.
Does the ohmmeter show the specified value?


≈0



Go to Step 9


Go to Step 10

9

Repair the open DLC ground circuit.
Is the repair complete?
–

System OK

–



10



1. Turn the ignition ON.
2. Check the voltage at the cigar lighter positive
terminal.
Does the voltmeter show the specified value?

11–14V


Go to Step 12


Go to Step 11

11


Repair the power supply for the cigar lighter socket.
Is the repair complete?
–

System OK

–



12



Check for a short to ground of open circuit between
terminal J (13) of the DLC and terminal 4 of
connector 208.
Is wiring harness shorted to ground or open?

–


Go to Step 13


Go to Step 14

13



Repair a short to ground or open circuit between
terminal J (13) of the DLC and terminal 4 of
connector C208.
Is the repair complete?


–



System OK



–



14




Check for a short to ground or open between
terminal 4 of connector C208 and terminal 9 of the
SDM connector.
Is wiring harness shorted to ground or open?



–



Go to Step 15



Go to Step 16
15 Replace the SDM waring harness.
Is the repair complete?
–

System OK

–
16

Replace the SDM.
Is the repair complete?

–

System OK

–

8B–12 SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DAEWOO M-150 BL2
FAULT CODES
Fault Codes Fault Contents
01

Driver Firing Circuit, Resistance Too High
02 Driver Firing Circuit, Resistance Too Low
03 Driver Firing Circuit, Short to Ground
04 Driver Firing Circuit, Short to Battery Ground 05 Passenger Firing Circuit, Resistance Too High
06

Passenger Firing Circuit, Resistance Too Low
07 Passenger Firing Circuit, Short to Ground
08 Passenger Firing Circuit, Short to Battery Voltage
09 Driver Pretensioner Circuit, Resistance Too High
10

Driver Pretensioner Circuit, Resistance Too Low
11 Driver Pretensioner Circuit, Short to Ground
12 Driver Pretensioner Circuit, Short to Battery Voltage
13 Passenger Pretensioner Circuit, Resistance Too High
14

Passenger Pretensioner Circuit, Resistance Too Low
15 Passenger Pretensioner Circuit, Short to Ground
16 Passenger Pretensioner Circuit, Short to Battery Voltage
17 Connection Between Driver Firing Circuit and Passenger Firing Circuit
18

Connection Between Driver Firing Circuit and Driver Pretensioner Circuit
19

Connection Between Driver Firing Circuit and Passenger Pretensioner Circuit
20 Connection Between Passenger Firing Circuit and Driver Pretensioner Circuit
21 Connection Between Passenger Firing Circuit and Passenger Pretensioner Circuit 22 Connection Between Driver Pretensioner Circuit and Passenger Pretensioner Circuit
23

Ignition Input Circuit, Voltage Too High
24 Ignition Input Circuit, Voltage Too Low
25 Warning Lamp Failure
31 SDM Internal Fault
32

SDM Crash Recorded

SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR) 8B–13
DAEWOO M-150 BL2
BLANK