1998 SSANGYONG MUSSO service

SUPPLEMENTAL RESTRAINT SYSTEM(SRS) 8B-3
CAUTIONS
Failure to follow the correct service procedure can cause air bag damage or personal injury due to unexpected air
bag deployment. Before service (removal and installation of part, check for replacement), please be weal noticed of
following items for your correct service.
1. For service, turn the ignition switch to ‘LOCK’ position and wait for 30 seconds after disconnecting the negative
battery cable.
2. If the vehicle collapsed, remove the air bag ECU first to reserve the crash records.
3, Never use other vehicles’ air bag components and replace with specified new part.
4. Never disassemble or repair the air bag module, air bag unit and wiring harness to re-use.
5. Replace the air bag module and air bag unit with new if it dropped, cracked or damaged.
6. Only qualified technicians in service shop should check or repair the air bag,
7. Before service, should be well noticed of warning labels on the vehicle.
A. Sun Visor Side
[Warning]
Pull down the sun visor and see SRS air bag
warning lamp on the head lining.
B. Head Lining
[Warning]
1 . This vehicle is equipped with air bag. Air bag is
supplemental device for the seatbelt. Fasten
your seatbelt.
2. This air bag should be replaced by authorized
supplier within replacement intervals.
3. When the ignition key is turned to ON position,
SRS warning lamp will turn on for 6 sec. and go
off. In this case, the system is normal.
For the following cases, see service manual.
- SRS warning lamp does not turn on.
- SRS warning lamp does not go off.
- SRS warning lamp continues to blink.
C. Steering Wheel Body Inner
[Warning]
Before removing the steering wheel, read service
manual first. Set the front wheels straight forward
and align the center position marks of SRS clock
spring. Improper removal or installation of the
steering wheel can damage the SRS components.D. Engine Compartment
[Warning]
This vehicle is equipped with air bag. Before
checking the engine compartment, read service
manual first. Faultuy check and service can cause
SRS air bag deployment and system defects that
can be led to severe damage.
E. Battery Cable
[Warning]
Before disconnecting the battery power, read
service manual first.

SUPPLEMENTAL RESTRAINT SYSTEM(SRS) 8B-11
Self-Diagnosis List
Fault
CodeDefectsService Hint
01 Driver’s squib (+) side No. 1
lShort of (+) side No. 1 in the driver’s squib circuit.
lCheck connection of connector.
lCheck the ECU.
Appli-
cation
02 Driver’s squib (+) side No. 2lShort of (+) side No. 2 in the driver’s squib circuit.
lCheck connection of connector.
lCheck the ECU.
X
03 Driver’s squib (+) side No. 3lShort of (+) side No. 3 in the driver’s squib circuit.
lCheck connection of connector.
lCheck the ECU.
X
04 Driver’s squib (+) side No. 4X
05 Driver’s squib ground (-) side No. 1lShort of ground side No. 1 in the driver’s squib
circuit.
lCheck and replace the ECU.
06 Driver’s squib ground (-) side No. 2lShort of ground side No. 2 in the driver’s squib
circuit.
lCheck and replace the ECU.
X
07 Driver’s squib ground (-) side No. 3lShort of ground side No. 3 in the driver’s squib
circuit.
lCheck and replace the ECU.
X
08 Driver’s squib ground (-) side No. 4lShort of ground side No. 4 in the driver’s squib
circuit.
lCheck and replace the ECU.
X
09 Energy shutdown switch No. 1lAir bag control unit internal defects.
lCheck and replace the ECU.
10 Energy shutdown switch No. 2lAir bag control unit internal defects.
lCheck and replace the ECU.
X
11 Energy shutdown switch No. 3lAir bag control unit internal defects.
lCheck and replace the ECU.
X
12 Energy shutdown switch No. 4lAir bag control unit internal defects.
lCheck and replace the ECU.
X
13 Ignition switch wire No. 1lAir bag control unit internal defects.
lCheck and replace the ECU.
14 Ignition switch wire No. 2lAir bag control unit internal defects.
lCheck and replace the ECU.
X
15 Ignition switch wire No. 3lAir bag control unit internal defects.
lCheck and replace the ECU.
X
16 Ignition switch wire No. 4XlAir bag control unit internal defects.
lCheck and replace the ECU.

8B-12 SUPPLEMENTAL RESTRAINT SYSTEM(SRS)
Fault
CodeDefectsService HintAppli-
cation
17 Squib No. 1 resistance
18 Squib No. 2 resistanceX
19 Squib No. 3 resistanceX
20 Squib No. 4 resistanceX
21 Squib No. 1 resistance
22 Squib No. 2 resistanceX
lDriver’s squib resistance is higher than standard
(4.5±0.5W).
lCheck related circuits for open/short.
lCheck connection of connector.
lCheck the ECU.
lReplace the squib wire.
lPlus side short : 7k, ground side short : 6kW.
lDriver’s squib resistance is higher than standard
(4.5±0.5W).
lCheck related circuits for open/short.
lCheck connection of connector.
lCheck the ECU.
lReplace the squib wire.
lPlus side short : 7k, ground side short : 6kW.
lDriver’s squib resistance is higher than standard
(4.5±0.5W).
lCheck related circuits for open/short.
lCheck connection of connector.
lCheck the ECU.
lReplace the squib wire.
lPlus side short : 7k, ground side short : 6kW.
lDriver’s squib resistance is higher than standard
(4.5±0.5W).
lCheck related circuits for open/short.
lCheck connection of connector.
lCheck the ECU.
lReplace the squib wire.
lPlus side short : 7k, ground side short : 6kW.
lDriver’s squib resistance is lower than standard
(1.4±0.3W).
lCheck related circuits for open/short.
lCheck connection of connector.
lCheck the ECU.
lReplace the squib wire.
lPlus side short : 7k, ground side short : 6kW.
lDriver’s squib resistance is lower than standard
(1.4±0.3W).
lCheck related circuits for open/short.
lCheck connection of connector.
lCheck the ECU.
lReplace the squib wire.
lPlus side short : 7k, ground side short : 6kW.
23 Squib No. 3 resistanceXlDriver’s squib resistance is lower than standard
(1.4±0.3W).
lCheck related circuits for open/short.
lCheck connection of connector.
lCheck the ECU.
lReplace the squib wire.
lPlus side short : 7k, ground side short : 6kW.

SUPPLEMENTAL RESTRAINT SYSTEM(SRS) 8B-13
Fault
CodeDefectsService HintAppli-
cation
24 Squib No. 4 resistance
X
25 Energy reserve No. 1 voltage
26 Energy reserve No. 2 voltageX
27 Energy reserve No. 3 voltageX
28 Energy reserve No. 4 voltageX
29 Energy reserve No. 5 voltage
30 Energy reserve No. 6 voltage
31 Energy reserve No. 1 current off
capacity
32 Energy reserve No. 2 current off
capacityX
33 Energy reserve No. 3 current off
capacityX
34 Energy reserve No. 4 current off
capacityX
35 Energy reserve No. 5 current off
capacity
36 Condensor voltage
37 Collision times checksum
lDriver’s squib resistance is lower than standard
(1.4±0.3W).
lCheck related circuits for open/short.
lCheck connection of connector.
lCheck the ECU.
lReplace the squib wire.
lPlus side short : 7k, ground side short : 6kW.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
4 1 Major USAlAir bag control unit internal defects.
lCheck and replace the ECU. 38 Driver’s acceleration sensor
39
Driver’s acceleration sensor off-set
40 Arming sensor
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.

8B-14 SUPPLEMENTAL RESTRAINT SYSTEM(SRS)
Fault
CodeDefectsService HintAppli-
cation
42 Over heat
4 3 SENS
44 Standard band gap
45 Temperature sensor
46 Warning lamp
47
Battery voltage
49 Fault code list
5 0 USA communication
51 LSA communication
52 No EEPROM program
53 EEPROM checksum
5 4 EEPROM map
55 External watchdog 1
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lOpen/short in the warning lamp circuit.
lCheck related circuits for open/short.
lCheck connection of connector.
lCheck the ECU.
lPower wire voltage is out of standard voltage (9
- 16V).
lCheck the battery for voltage and charging.
lCheck related circuits for open/short.
lCheck connection of connector.
lCheck the ECU.
lAir bag control unit internal defects.
lCheck the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
56 Arming sensor-no close
57 RAM check
5 8 System
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.
59 External watchdog 2
6 0 Pulse
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.

SUPPLEMENTAL RESTRAINT SYSTEM(SRS) 8B-15
Fault
CodeDefectsService HintAppli-
cation
127 Collision signal
128 Collision number
lAir bag control unit internal defects.
lCheck and replace the ECU.
lAir bag control unit internal defects.
lCheck and replace the ECU.

8B-18 SUPPLEMENTAL RESTRAINT SYSTEM(SRS)
MAINTENANCE AND REPAIR
ON-VEHICLE SERVICE
AIR BAG MODULE
Removal & Installation Procedure
1. Remove the steering wheel rid (LH,RH) with a screwdriver.
Installation Notice
Each position mark (LH,RH) is stamped on the inner surface
of the rids.
Tightening Torque 7 - 11 Nm
3. Disconnect the connectors and remove the air bag module.
4. Installation should follow the removal procedure in the
reverse order. 2. Unscrew the bolts from both sides.
Installation Notice

SUPPLEMENTAL RESTRAINT SYSTEM(SRS) 8B-21
AIR BAG CONTROL UNIT(AC4)
Removal & Installation Procedure
AC4 is installed on the center portion of the front floor tunnel.
Built-in accelerometer sensor detects collision and determines
action or non-action and ignition time.
Notice
Do not disassemble the AC4 to repair. If defective, replace it.
AC4 should not be shocked or vibrated by dropping on the
ground or bumping.
Replace the AC4 with new after air bag inflation.
1. Disconnect the negative battery cable and wait for 30
seconds before starting service.
Notice
Though battery cable is disconnected, air bag control unit
will maintain backup power for 150ms and air bag can be
inflated, so wait for min.30 seconds.
2. Remove the console box and center fascia panel assembly.
3. Remove the heater control switch and audio assembly.
4. Remove the lower side panel of the driver’s portion and
glove box.
5. Remove the lower main panel.
6. Release the lock lever of the AC4 connector and disconnect
the connector.
7. Unscrew 3 nuts and remove the AC4.
Notice
For installation, horizontal position should be secured for
the better changes of collision pulse between the vehicle
body and air bag control unit.
8. Installation should follow the removal procedure in the
reverse order.
Inspection Procedure
1. Check AC4 case and welt bolts for crack or deformation.
2. Check connector, lock lever and terminal for deformation.
Notice
Replace the AC4 with new if dust, deformation or corrosion
found.