2003 DAEWOO MATIZ lock

7A–20 HEATING AND VENTILATION SYSTEM
DAEWOO M-150 BL2
D108A507
BLOWER MOTOR AND COOLING
HOSE
(Left–Hand Drive Shown, Right–Hand
Drive Similar)
Removal Procedure
1. Remove the blower motor cooling hose.
D108A508
2. Remove the blower motor.

Disconnect the motor electrical connector (1).

Turn the blower motor (2).
D108A509
Installation Procedure
1. Install the blower motor by turning the motor clock-
wise.
2. Connect the motor electrical connector.
3. Install the blower motor cooling hose.
D108A510
BLOWER RESISTOR
(Left–Hand Drive Shown, Right–Hand
Drive Similar)
Removal Procedure
1. Remove the blower resistor.

Disconnect the blower resistor connector (1).

Remove the screws (2).

HEATING AND VENTILATION SYSTEM 7A–21
DAEWOO M-150 BL2
D108A511
Installation Procedure
1. Install the blower resistor with the retaining screws.
2. Connect the blower resistor connector.
D108A512
BLOWER MOTOR SWITCH
(Left–Hand Drive Shown, Right–Hand
Drive Similar)
Removal Procedure
1. Remove the control assembly. Refer to “Control As-
sembly and Control Cables” in this section.
2. Remove the blower motor switch.

Remove the switch knob (1).
D108A513

Remove the blower motor switch retaining screw
(2).

Turn the blower motor switch anticlockwise (3).
D108A514
Installation Procedure
1. Install the blower motor switch with the screw.
2. Install the switch knob.
3. Install the control assembly. Refer to “Control Assem-
bly and Control Cables” in this section.

7B–2 MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO M-150 BL2
DESCRIPTION AND OPERATION
SYSTEM COMPONENTS
–FUNCTIONAL
Compressor
All compressors are belt–driven from the engine crank-
shaft through the compressor clutch pulley. The com-
pressor pulley rotates without driving the compressor
shaft until on electromagnetic clutch coils energized.
When voltage is applied to energize the clutch coil, the
clutch plate and hub assembly are drawn toward the
pulley. The magnetic force locks the clutch plate and
pulley together as one unit to drive the compressor
shaft.
Condenser Core
The condenser assembly in front of the radiator consists
of coils which carry the refrigerant and cooling fins that
provide the rapid transfer of heat. The air passing
through the condenser cools the high–pressure refriger-
ant vapor and cause it to condense into a liquid.
Expansion Valve
The expansion valve is located on the passenger
compartment side of the dash panel. The expansion
valve can fail in three different positions: open, closed,
or restricted. An expansion valve that fails in the open
position will result in a noisy A/C compressor or no cool-
ing. The cause can be a broken spring, a broken ball, or
excessive moisture in the A/C system. If the spring or
the ball is found to be detective, replace the expansion
valve. If excessive moisture is found in the A/C system,
recycle the refrigerant. An expansion valve that fails in
the closed position will result in low suction pressure and
no cooling. This may be caused by a failed power done
or excessive moisture in the A/C system. If the power
dome on the expansion valve is found to be defective,
replace the expansion valve. If excessive moisture is
found in the A/C system, recycle the refrigerant.
A restricted expansion valve will result in low suction
pressure and no cooling. This may be caused by debrisin the refrigerant system. If debris is believed to be
cause, recycle the refrigerant, replace the expansion
valve, and replace the receiver/dryer.
Evaporator Core
The evaporator is device which cools and dehumidifies
the air before it enters the vehicle. High–pressure liquid
refrigerant flows through the expansion tube (orifice)
and becomes a low–pressure gas in the evaporator. The
heat in the air passing through the evaporator core is
transferred to the cooler surface of the core, which cools
the air. As the process of heat transfer from the air to the
evaporator core surface is taking place, any moisture
(humidity) in the air condenses on the outside surface of
the evaporator core and is drained off as water.
Receiver–Dryer
The sealed receiver–dryer assembly is connected to the
evaporator outlet pipe. It acts as a refrigerant storing
container, receiving liquid and some vapor and refriger-
ant oil from the evaporator.
At the bottom the receiver–dryer is the desiccant, which
acts as a drying agent for the moisture that may have
entered the system. The receiver–dryer is serviceable
only as an assembly.
Dual Cut Switch
The dual cut switch controls compressor operation when
the cycling refrigerant pressure is dropped or surged.
Evaporator Thermistor
A semiconductor which resistance is noticeably changed
as the change of temperature. When the refrigerant tem-
perature of the evaporator drops to 0
C (32
F) and be-
low, the evaporator cores get stuck with frost or ice,
reducing the airflow, lowering the cooling capacity. The
thermistor is a sensor which is used to prevent from frost-
ing or icing.
The thermistor is installed on the evaporator.

MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B–5
DAEWOO M-150 BL2
DIAGNOSTIC INFORMATION AND PROCEDURES
GENERAL DIAGNOSIS
TESTING THE REFRIGERANT
SYSTEM
If you suspect a problem in the refrigerant system,
check for the following conditions:
1. Check the outer surfaces of the radiator and the con-
denser cores to be sure that the airflow is not blocked
by dirt, leaves, or other foreign material. Check be-
tween the condenser and the radiator, as well as all
outer surfaces.
2. Check for restrictions or kinks in the condenser core,
the hoses, and the tubes.
3. Check the operation of the blower fan.
4. Check all the air ducts for leaks or restrictions. A low
airflow rate may indicate a restricted evaporator core.
5. Check for slippage of the compressor clutch.
6. Check the drive belt tension.
INSUFFICIENT COOLING “QUICK
CHECK” PROCEDURE
Perform the following “hand-feel” procedure to get a
quick idea of whether the air conditioning (A/C) system
has the proper charge of Refrigerant-134a.
1. Warm up the engine. Run the engine at idle.
2. Open the hood and all the doors.
3. Turn the A/C switch ON.
4. Set the temperature control to the full cold position.
5. Set the blower speed switch on 4.
6.“Hand-feel” the temperature of the evaporator outlet
pipe. The pipe should be cold.
7. Check for other problems. Refer to “Testing the Re-
frigerant System” in this section.
8. Leak check the system. Refer to “Leak Testing the
Refrigerant System” in this section. If you find a leak,
discharge the system and repair the leak as required.
After completing the repair, evacuate and charge the
system.
9. If there is no leak, refer to “Insufficient Cooling Diag-
nosis” in this section.

MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B–7
DAEWOO M-150 BL2
LEAK TESTING THE REFRIGERANT
SYSTEM
Test for leaks whenever you suspect a refrigerant leak in
the system. You should also test for leaks whenever you
perform a service operation which results in disturbing
the lines or the connections. Leaks are commonly found
at the refrigerant fittings or at the connections. Leaks are
commonly caused by the following problems:
Improper torque.
Damaged O-ring seals.
Dirt or lint on the O-ring seals.
Liquid Leak Detectors
Use a liquid leak detector solution on locations such as
fittings. Apply the solution to the area in question with
the swab that is supplied with the solution. Look for
bubbles to appear. This will indicate the existence and
location of any leak.
For areas where this is not practical, such as sections of
the evaporator and the condenser, an electronic leak de-
tector is more useful.
Electronic Leak Detectors
Follow the manufacturer’s instructions for calibration,
operation, and maintenance of an electronic leak detec-
tor. Battery condition is especially important to the accu-
racy of a portable model. Set the detector to R-134a
before beginning the test.
Important: Electronic leak detectors are sensitive to
windshield washing solutions, solvents and cleaners,
and certain vehicle adhesives.
Surfaces must be clean to prevent false readings. Make
sure that all surfaces are dry to prevent damage to the
detector.
General Testing Instructions
Follow the entire path of the refrigerant system.
Completely circle each joint at 25 to 50 mm (1 to 2
inches) per second.
Hold the probe tip within 6 mm (1/4 inch) of the sur-
face.
Do not block the air intake.The audible tone changes from 1 to 2 clicks per second
into a solid alarm if there is a leak. Adjust the balance
control to maintain 1 to 2 clicks per second.
Test all of the following areas, even after one leak has
been confirmed:
Evaporator inlet and outlet.
Receiver-drier inlet and outlet.
Condenser inlet and outlet.
Brazed and welded areas.
Damaged areas.
Hose couplings.
Compressor rear head.
All fittings and joints.
Testing Service Ports/Access Valves
The sealing cap is the primary seal for the service ports.
This cap contains a special leak-free O-ring. Make sure
that this cap is not missing or loose. Always use the cor-
rect cap.
Testing the Evaporator Core
Leaks in the evaporator core are difficult to find. Test the
evaporator core using the following procedure:
1. Run the blower fan at speed setting 4 for at least
15 minutes.
2. Turn the blower to the OFF position.
3. Wait for 10 minutes.
4. Remove the blower motor resistor. Refer to “Blower
Motor Resistor” in this section.
5. Insert the leak detector probe as close as possible to
the evaporator core. The detector will indicate a leak
with a solid alarm.
6. Use a flashlight to search for refrigerant oil in the core
surface.
Testing the Compressor Shaft Seal
1. Blow shop air behind and in front of the compressor
clutch/pulley for at least 15 seconds.
2. Wait 1 to 2 minutes.
3. Probe the area in front of the pulley. If the detector
emits a solid alarm, there is a leak.

7B–18 MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO M-150 BL2
D108B501
A/C PUSH KNOB
(Left–Hand Drive Shown, Right–Hand
Drive Similar)
Removal Procedure
1. Remove the instrument cluster housing trim panel.
Refer to Section 9E, Instrumentation/Driver Informa-
tion.
2. Remove the A/C push knob.
Disconnect the temperature control cable from the
heater module (1).
Disconnect the mode control cable from the heater
module (2).
D108B502
Remove the control assembly retaining screws (3).
Pull out the control assembly.
Remove the A/C push knob by pushing the knob
lock (4).
Disconnect the A/C push knob electrical connector
(5).
D108A506
Installation Procedure
1. Install the A/C push knob to the control assembly.
2. Connect the A/C push knob electrical connector.
3. Install the control assembly with the screws.
4. Connect the mode control cable to the heater mod-
ule.
5. Connect the temperature control cable to the heater
module.
6. Install the instrument cluster housing trim panel. Re-
fer to Section 9E, Instrumentation / Driver Informa-
tion.
D18B503A
RECEIVER DRYER AND DUAL CUT
SWITCH
Removal Procedure
1. Recover the refrigerant. Refer to “Discharging, Add-
ing Oil, Evaculating, and Charging Procedures for
A/C System” in this section.
2. Remove the front bumper fascia. Refer to Section
9O, Bumpers and Fascias.
3. Remove the receiver dryer.
Disconnect the dual cut switch connector (1).
Remove the receiver dryer flange nuts (2).
Remove the bracket bolt (3).
Discard the O–ring (4).

8A –2 SEAT BELTS
DAEWOO M-150 BL2
DESCRIPTION AND OPERATION
DRIVER SEAT BELT WARNING
The driver’s safety belt incorporates a safety belt re-
minder light in the instrument cluster to remind the driver
if the safety belt is not fastened when the ignition is
turned ON.
THREE-POINT PRETENSIONER
FRONT SEAT BELT (W/EUROPE
ONLY)
The pretensioner front seat belt is optional. It contains a
electrically-controlled pyrotechnical retractor, which re-
duces seat belt slack when it is activated in a head-on or
angled front collision. The pretensioner front seat belt
must be replaced after an accident that causes its ac-
tivation.
THREE-POINT WLR FRONT SEAT
BELT
The three-point web locking retractor (WLR) seat belt
will limit the movement of the driver and offer better
protection in an accident.
THREE-POINT ELR FRONT SEAT
BELT
The three-point emergency locking retractor (ELR) front
seat belt is always unlocked, allowing the passenger
freedom of movement, except in emergencies (rapid de-
celeration, rapid acceleration, or hard cornering maneu-
vers).
THREE-POINT ELR REAR
OUTBOARD SEAT BELT
The rear outboard seating positions use the three-point
emergency locking retractor (ELR) seat belts. The
three-point emergency locking retractor (ELR) seat beltis always unlocked, allowing the passenger freedom of
movement, except in emergencies (rapid deceleration,
rapid acceleration, or hard cornering maneuvers).
TWO-POINT LAP REAR CENTER
SEAT BELT
The two-point lap rear center seat belt is a single contin-
uous length of webbing. The webbing is routed from the
anchor through a latch plate and into a single retractor.
OPERATIONAL AND FUNCTIONAL
CHECKS
Caution:

Keep sharp objects and potentially damaging ob-
jects away from the seat belts.

Avoid bending or damaging any portion of the
buckle or the latch plate.

Do not bleach or dye the belt webbing. Use only
mild soap and water in order to clean the belts.

When installing the seat belt anchor bolts and
the screws, start the bolts and the screws by
hand in order to prevent crossthreading.

Do not attempt any repairs on the retractor mech-
anisms or the covers. Replace any defective as-
semblies with new assemblies.

Replace any belts that are cut or damaged in any
way.
1. Inspect all seat belt anchor bolts and the screws in or-
der to verify that they are secure.
2. Inspect the seat belt buckle. The buckle must lock
and unlock easily.
3. After inserting the latch into the buckle, tug sharply on
the belt. The buckle must remain locked.
4. Fully extend the shoulder belt portion to make sure
that there is no twisting or tears in the belt.
5. Let the shoulder belt retract fully. The belt should re-
tract easily.

DAEWOO M-150 BL2
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 must also be in B unless otherwise
noted.
TABLE OF CONTENTS
Description and Operation 8B-3. . . . . . . . . . . . . . . . . .
Airbag Module 8B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sensing and Diagnostic Module (SDM) 8B-3. . . . . . .
SIR Warning Lamp 8B-3. . . . . . . . . . . . . . . . . . . . . . . .
Clock Spring 8B-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Harness/Connectors 8B-4. . . . . . . . . . . . . . . . .
SIR System 8B-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Precautions 8B-5. . . . . . . . . . . . . . . . . . . . . . .
Airbag Deployment Condition 8B-5. . . . . . . . . . . . . . .
Airbag Deployment Procedure 8B-6. . . . . . . . . . . . . .
Component Locator 8B-7. . . . . . . . . . . . . . . . . . . . . . . .
SIR Component 8B-7. . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Information and Procedures 8B-8. . . . .
Bulb Check 8B-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fault Indication 8B-8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clearing Fault Codes 8B-8. . . . . . . . . . . . . . . . . . . . . .
Microprocessor – Independent Lamp
Activation 8B-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Check 8B-10. . . . . . . . . . . . . . . . . . . . . . . . . . .
Fault Codes 8B-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC 01 Driver Firing Circuit,
Resistance Too High 8B-14. . . . . . . . . . . . . . . . . . . .
DTC 02 Driver Firing Circuit,
Resistance Too Low 8B-16. . . . . . . . . . . . . . . . . . . .
DTC 03 Driver Firing Circuit,
Short To Ground 8B-18. . . . . . . . . . . . . . . . . . . . . . .
DTC 04 Driver Firing Circuit,
Short To Battery Voltage 8B-20. . . . . . . . . . . . . . . .
DTC 05 Passenger Firing Circuit,
Resistance Too High 8B-22. . . . . . . . . . . . . . . . . . . .
DTC 06 Passenger Firing Circuit,
Resistance Too Low 8B-24. . . . . . . . . . . . . . . . . . . .
DTC 07 Passenger Firing Circuit,
Short To Ground 8B-26. . . . . . . . . . . . . . . . . . . . . . .
DTC 08 Passenger Firing Circuit,
Short To Battery Voltage 8B-28. . . . . . . . . . . . . . . .
DTC 09 Driver Pretensioner Circuit,
Resistance Too High 8B-30. . . . . . . . . . . . . . . . . . . . DTC 10 Driver Pretensioner Circuit,
Resistance Too Low 8B-32. . . . . . . . . . . . . . . . . . . .
DTC 11 Driver Pretensioner Circuit,
Short to Ground 8B-34. . . . . . . . . . . . . . . . . . . . . . . .
DTC 12 Driver Pretensioner Circuit,
Short to Battery Voltage 8B-36. . . . . . . . . . . . . . . . .
DTC 13 Passenger Pretensioner Circuit,
Resistance Too High 8B-38. . . . . . . . . . . . . . . . . . . .
DTC 14 Passenger Pretensioner Circuit,
Resistance Too Low 8B-40. . . . . . . . . . . . . . . . . . . .
DTC 15 Passenger Pretensioner Circuit,
Short to Ground 8B-42. . . . . . . . . . . . . . . . . . . . . . . .
DTC 16 Passenger Pretensioner Circuit,
Short to Battery Voltage 8B-44. . . . . . . . . . . . . . . . .
DTC 18 Connection Between Driver Firing
Circuit and Driver Pretensioner Circuit 8B-46. . . . .
DTC 19 Connection Between Driver Firing
Circuit and Passenger Pretensioner Circuit 8B-48
DTC 20 Connection Between Passenger Firing
Circuit and Driver Pretensioner Circuit 8B-50. . . . .
DTC 21 Connection Between Passenger Firing
Circuit and Passenger Pretensioner Circuit 8B-52
DTC 22 Connection Between Driver Pretensioner
Circuit and Passenger Pretensioner Circuit 8B-54
DTC 23 Ignition Input Circuit, Voltage
Too High 8B-56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC 24 Ignition Input Circuit, Voltage
Too Low 8B-58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC 25 Warning Lamp Failure 8B-60. . . . . . . . . . . . .
DTC 31 SDM Internal Fault 8B-63. . . . . . . . . . . . . . . .
DTC 32 SDM Crash Recorded 8B-63. . . . . . . . . . . . .
Diagnostic Illustration 1 8B-63. . . . . . . . . . . . . . . . . . .
Diagnostic Illustration 2 8B-64. . . . . . . . . . . . . . . . . . .
Diagnostic Illustration 3 8B-64. . . . . . . . . . . . . . . . . . .
Diagnostic Illustration 4 8B-64. . . . . . . . . . . . . . . . . . .
Diagnostic Illustration 5 8B-64. . . . . . . . . . . . . . . . . . .
Diagnostic Illustration 6 8B-65. . . . . . . . . . . . . . . . . . .
Diagnostic Illustration 7 8B-65. . . . . . . . . . . . . . . . . . .