Daewoo Musso. Manual — part 326
SUPPLEMENTAL RESTRAINT SYSTEM(SRS) 8B-9
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
8B-10 SUPPLEMENTAL RESTRAINT SYSTEM(SRS)
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 “Musso (’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
SUPPLEMENTAL RESTRAINT SYSTEM(SRS) 8B-11
Self-Diagnosis List
Fault
Code
Defects
Service Hint
01
Driver’s squib (+) side No. 1
l
Short of (+) side No. 1 in the driver’s squib circuit.
l
Check connection of connector.
l
Check the ECU.
Appli-
cation
02
Driver’s squib (+) side No. 2
l
Short of (+) side No. 2 in the driver’s squib circuit.
l
Check connection of connector.
l
Check the ECU.
X
03
Driver’s squib (+) side No. 3
l
Short of (+) side No. 3 in the driver’s squib circuit.
l
Check connection of connector.
l
Check the ECU.
X
04
Driver’s squib (+) side No. 4
X
05
Driver’s squib ground (-) side No. 1
l
Short of ground side No. 1 in the driver’s squib
circuit.
l
Check and replace the ECU.
06
Driver’s squib ground (-) side No. 2
l
Short of ground side No. 2 in the driver’s squib
circuit.
l
Check and replace the ECU.
X
07
Driver’s squib ground (-) side No. 3
l
Short of ground side No. 3 in the driver’s squib
circuit.
l
Check and replace the ECU.
X
08
Driver’s squib ground (-) side No. 4
l
Short of ground side No. 4 in the driver’s squib
circuit.
l
Check and replace the ECU.
X
09
Energy shutdown switch No. 1
l
Air bag control unit internal defects.
l
Check and replace the ECU.
10
Energy shutdown switch No. 2
l
Air bag control unit internal defects.
l
Check and replace the ECU.
X
11
Energy shutdown switch No. 3
l
Air bag control unit internal defects.
l
Check and replace the ECU.
X
12
Energy shutdown switch No. 4
l
Air bag control unit internal defects.
l
Check and replace the ECU.
X
13
Ignition switch wire No. 1
l
Air bag control unit internal defects.
l
Check and replace the ECU.
14
Ignition switch wire No. 2
l
Air bag control unit internal defects.
l
Check and replace the ECU.
X
15
Ignition switch wire No. 3
l
Air bag control unit internal defects.
l
Check and replace the ECU.
X
16
Ignition switch wire No. 4
X
l
Air bag control unit internal defects.
l
Check and replace the ECU.
8B-12 SUPPLEMENTAL RESTRAINT SYSTEM(SRS)
Fault
Code
Defects
Service Hint
Appli-
cation
17
Squib No. 1 resistance
18
Squib No. 2 resistance
X
19
Squib No. 3 resistance
X
20
Squib No. 4 resistance
X
21
Squib No. 1 resistance
22
Squib No. 2 resistance
X
l
Driver’s squib resistance is higher than standard
(4.5±0.5W).
l
Check related circuits for open/short.
l
Check connection of connector.
l
Check the ECU.
l
Replace the squib wire.
l
Plus side short : 7k, ground side short : 6kW.
l
Driver’s squib resistance is higher than standard
(4.5±0.5W).
l
Check related circuits for open/short.
l
Check connection of connector.
l
Check the ECU.
l
Replace the squib wire.
l
Plus side short : 7k, ground side short : 6kW.
l
Driver’s squib resistance is higher than standard
(4.5±0.5W).
l
Check related circuits for open/short.
l
Check connection of connector.
l
Check the ECU.
l
Replace the squib wire.
l
Plus side short : 7k, ground side short : 6kW.
l
Driver’s squib resistance is higher than standard
(4.5±0.5W).
l
Check related circuits for open/short.
l
Check connection of connector.
l
Check the ECU.
l
Replace the squib wire.
l
Plus side short : 7k, ground side short : 6kW.
l
Driver’s squib resistance is lower than standard
(1.4±0.3W).
l
Check related circuits for open/short.
l
Check connection of connector.
l
Check the ECU.
l
Replace the squib wire.
l
Plus side short : 7k, ground side short : 6kW.
l
Driver’s squib resistance is lower than standard
(1.4±0.3W).
l
Check related circuits for open/short.
l
Check connection of connector.
l
Check the ECU.
l
Replace the squib wire.
l
Plus side short : 7k, ground side short : 6kW.
23
Squib No. 3 resistance
X
l
Driver’s squib resistance is lower than standard
(1.4±0.3W).
l
Check related circuits for open/short.
l
Check connection of connector.
l
Check the ECU.
l
Replace the squib wire.
l
Plus side short : 7k, ground side short : 6kW.
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