Daewoo Korando. Manual - part 326

SUPPLEMENTAL RESTRAINT SYSTEM(SRS) 8B-7

Energy Reserve System

Energy reserve system is consisted of condensor and energy switch and will check following items continuously
during system operation.

High voltage

Low voltage

Low rating capacity

Function of the energy reserve switch

If there is fault in the energy reserve system, warning lamp will turn on. And defects are found by continuous

checking of the condenser voltage, the system will enter overall shutdown status for safety reason.

Shutdown Switch

There is 1 energy shutdown switch in the system and it will be checked during start-up. And it also checks that
condenser is discharging properly. If shutdown switch is short, it will be detected during condensor voltage test.

If squib line fault is obvious, the warning lamp will turn on and the module will enter overall shutdown status.

Accelerometer Check

Accelerometer function will be checked during start-up. During operation, accelerometer off-set signal will be checked,
If there is fault, module will enter overall shutdown status.

ASIC Overheat

Module monitors upper side ASIC overheats continuously. If overheated, the module will enter overall shutdown
status.

Microprocessor Fault

Module checks EEPROM, ROM checksum and RAM during start-up. EEPROM tests checksum operation.

If RAM or ROM checksum is defective, module will not allow start-up continuously but will be re-set,

If EEPROM is defective, warning lamp will turn on and the module will enter overall shutdown status.

During operation, RAM will continuously verify the proper operation of temporary memory program data usage. If
there is fault, the module will enter overall shutdown status and the warning lamp will turn on.

Watchdog Test

Watchdog function will be tested in start-up. If there is fault during the test, warning lamp will turn on and the module
will enter overall shutdown status.

8B-8 SUPPLEMENTAL RESTRAINT SYSTEM(SRS)

Diagnosis

Air bag control unit diagnoses each function in the intervals of 250ms - 20 sec. during start-up or driving to prevent
unwanted air bag deployment. If there is defect, it turns on or blinks warning lamp to indicate defects in the air bag
system to the driver. And fatal defect is found, air bag control unit enters overall or partial shutdown status and fault
code will be stored.

Air bag control unit diagnoses following items.

- Ignition TR

- Acceleration

- Microprocessor, RAM and ROM

- Watchdog

- Shutdown Switch

Diagnosis Condition

Diagnosis Items

Start-up (ignition ON)

During Driving

Lamp Blinking Mode

There are 2 kinds of blinking mode

1. When system internal fault is found, the lamp will stay on.

2. The lamp will blink according to external fault and there are 2 blinking codes.

Blinking code 1 (Squib resistance fault in the driver’s air bag squib line)

Blinking code 2 (Squib short on plus and minus in the air bag squib line)

Lamp blinking code is as follows. The last blinking will be within 0.5 sec. and 1 cycle of blinking will be repeated every
5 seconds.

Blinking Code 1

(Sec.) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

Blinking Code 3

(Sec.) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

- Squib resistance

- Squib line short to battery and ground

- Energy reserve system

- Lamp output

- Battery voltage

- ASIC communication

- Arming sensor

- ASIC overheating

- RAM and W/D

- EEPROM

SUPPLEMENTAL RESTRAINT SYSTEM(SRS) 8B-9

1. Position the ignition switch to ‘OFF’.

2. Connect the harness connector of scanner to the diagnosis

socket in engine compartment.

3. Turn the ignition switch to ‘ON’ position.

4. Select “Electronic control vehicle diagnosis” from function

selection display and press ‘Enter’.

5. Select “Korando (’98 model year)” from vehicle model

selection display and press ‘Enter’.

6. Select “Electronic air bag” from control system selection

display and press ‘Enter’.

7. Select “Self-diagnosis” from diagnosis item selection display.

Notice

Check sensor value of output display, if necessary.

8. Determine the fault code and trace defective component.

Notice

Refer to self-diagnosis list.

SELF DIAGNOSIS

1 Diagnosis Connector
2 Fuse Box

3 Solenoid Valve

8B-10 SUPPLEMENTAL RESTRAINT SYSTEM(SRS)

Self-Diagnosis List

Fault

Code

Defects

Service Hint

Driver’s squib (+) side No. 1

Short of (+) side No. 1 in the driver’s squib circuit.

Check connection of connector.

Check the ECU.

Appli-

cation

Driver’s squib (+) side No. 2

Short of (+) side No. 2 in the driver’s squib circuit.

Check connection of connector.

Check the ECU.

Driver’s squib (+) side No. 3

Short of (+) side No. 3 in the driver’s squib circuit.

Check connection of connector.

Check the ECU.

Driver’s squib (+) side No. 4

Driver’s squib ground (-) side No. 1

Short of ground side No. 1 in the driver’s squib
circuit.

Check and replace the ECU.

Driver’s squib ground (-) side No. 2

Short of ground side No. 2 in the driver’s squib
circuit.

Check and replace the ECU.

Driver’s squib ground (-) side No. 3

Short of ground side No. 3 in the driver’s squib
circuit.

Check and replace the ECU.

Driver’s squib ground (-) side No. 4

Short of ground side No. 4 in the driver’s squib
circuit.

Check and replace the ECU.

Energy shutdown switch No. 1