SsangYong Musso. Manual — part 543
8B-2 SUPPLEMENTAL RESTRAINT SYSTEM(SRS)
SCHEMATIC AND ROUTING DIAGRAMS
AIR BAG
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.
8B-4 SUPPLEMENTAL RESTRAINT SYSTEM(SRS)
FUNCTION DESCRIPTION
Air Bag Control Unit (AC4)
Air bag control unit (AC4) is installed on the center portion of
the front floor tunnel.
It is a central control unit that control all functions and determines
whether deploy the air bag or not with the collision signal from
the built-in accelerometer sensor and has function of diagnosing
system defects.
Internal air bag control unit is consisted as follows;
!
Microprocessor
!
ASICs (Upper side ASIC & lower side ASIC)
!
Accelerometer sensor
!
Arming sensor
!
System energy backup condenser
!
Squib energy backup condenser
SUPPLEMENTAL RESTRAINT SYSTEM(SRS) 8B-5
Input & Output Function
Electronic air bag control and diagnosis module is connected
by full 30-pin connectors.
Input : ground
Output : 1 squib line, warning lamp
Input/output : communication, diagnosis
16 Shorting Bar
17 Shorting Bar
18 Shorting Bar
19 Shorting Bar
20 Diagnosis
21 Shorting Bar
22 Shorting Bar
23 No Pin
24 No Pin
25 Shorting Bar
26 Shorting Bar
27 N/A
28 Shorting Bar
29 Shorting Bar
30 N/A
1 Lamp
2 Ground
3 N/A
4 N/A
5 Ignition
6 N/A
7 N/A
8 CONF
9 N/A
10 N/A
11 N/A
12 N/A
13 Squib Line 1(upper)
14 Squib Line 1(lower)
15 N/A
IGN
GND
Warning lamp
RxD/TxD
Inflator line 1
+
-
5
2
1
20
13
14
Air bag lamp
Communication/
diagnosis
Air bag
control
unit
Ground connection or open
Connector Pins
15
30
1
16
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