1998 SSANGYONG MUSSO ECU

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.

8B-22 SUPPLEMENTAL RESTRAINT SYSTEM(SRS)
GENERAL DESCRIPTION
AND SYSTEM OPERATION
INTRODUCTION
SRS (Supplemental Restraint System) air bag protects driver
and passenger by inflating air bag under collision and seat
belt pre - tensioner is a supplemental equipment for seat belt
reducing shocks from the collision by pulling passenger’s body
against seat back at the same time of air bag inflation.
Air bag unit has diagnosis functions and indicates system
malfunctions to the driver by turning on the air bag warning
lamp.
CAUTION
Perform the service procedures for the air bag system as
ordered, if not, the air bag can be operated suddenly and it
could result in damage of air bag or injury. Before service
(removal, installation, checking and replacement of parts),
observe the following instructions and service correctly.
1. To service, turn the ignition switch to ‘LOCK’ position and
disconnect the negative battery cable and continue the
procedures after approx. 30 seconds.
2. If the vehicle is damaged due to accident, remove the air
bag ECU first to get the accident records.
3. Never use the other vehicle’s air bag parts and replace
with genuine part, if required.
4. Do not disassemble or repair the air bag module, air bag
unit and wiring harness to reuse.
5. Replace the air bag unit or air bag module if dropped,
cracked or damaged.

9A-8 BODY WIRING SYSTEM
1 Fuse Box
2 Door Lock Relay
3 Relay Box
3.1 Front Wiper Relay
3.2 ABS Warning Lamp Relay....................................ABD 5.0
3.3 Flasher Unit
3.4 Fuel Pump Relay.................................................Gasoline E/G
3.5 Shift Lock Relay...................................................Automatic Transmission
3.6 Clutch Interlock & Neutral Relay...........................Manual Transmission or Automatic Transmission
3.7 Sun Roof Relay
3.8 Automatic Transmission ‘B’ Switch Interlock.......Automatic Transmission
3.9 Power Window Relay
3.10 Rear Fog Lamp Relay..........................................Rear Fog Lamp
3.11 ECS Relay
4 Defogger Relay
5 Ground 1
6 Roof Wiring Connector
7 Diode 1
8 Front Door Wiring Connector
9 Front Door Wiring Connector
10 Front Door Wiring Connector
11 Front Door Wiring Connector
12 Kick Down Relay..................................................Automatic Transmission
13 Floor Wiring Connector
14 Floor Wiring Connector
15 Floor Wiring Connector
16 ABD Floor Wiring Connector................................ABD 5.0
17 ECS Floor Wiring Connector
18 Rear Iper & Washer Switch
19 Clutch Switch........................................................Manual Transmission
19-1Clutch Switch........................................................E32 Gasoline E/G with Manual Transmission
20 Stop Lamp Switch
21 Outside Mirror Switch
22 Ignition Switch
23 Multi Function Switch
24 Multi Function Switch
25 Black Out Switch..................................................Black Out Lamp
26 Black out switch...................................................Black Out Lamp
27 Joint Connector (Tail)
28 Joint Connector (Ignition)
29 Cluster
30 Cluster .................................................................Automatic Transmission
31 Cluster
32 Cluster
33 4WD Switch..........................................................Except TOD
33-14WD Switch.......................................................... TOD
3 4 Hazard Switch
35 Ground 2
36 Pedal Module.......................................................Gasoline E/G with MSE ECU
37 Audio Switch
3 8 Immobilizer...........................................................Crypto Type, Gasoline E/G with MSE ECU or Diesel E/G
39 Ignition Switch
40 Multi Function Switch
4 1 STICS
4 2 STICS
4 3 REKES.................................................................Remote Keyless

BODY WIRING SYSTEM 9A-9
44 Joint Connector.................................................... Ground
45 Door Unlock Switch
46 Front Fog Lamp Switch
47 Rear Defogger Switch
4 8 ECS Switch
49 Rear Fog Lamp Switch........................................Rear Fog Lamp
50 Digital Clock
51 Thermo Amplifier
52 Glove Box Lamp Switch
53 Air Conditioner Wiring Connetor
54 Glove Box Lamp
55 Ground 6
56 Ground 6.............................................................Gasoline E/G
57 Ground 7.............................................................Gasoline E/G
58 Wheel Speed Sensor (FR)..................................ABS 5.0 or ABD 5.0
59 O
2 Sensor............................................................E32 Gasoline E/G
60 Engine Main Wiring Connector............................Gasoline E/G with MSE ECU
61 HFM .....................................................................Gasoline E/G with HFM ECU
61-1 MSE .....................................................................Gasoline E/G with MSE ECU
62 Front Door Wiring Connector (Passenger Side)
63 Front door Wiring Connector (Passenger Side)
64 Joint Connector (B+)
65 Audio
66 Audio
67 Air Bag Wiring Connector
68 Chime Bell
6 9 Buzzer
70 Kick Down Switch.................................................Automatic Transmission
71 Diode 2................................................................Manual Transmission
72 Ground 3
73 Ground 4
74 Front Cigarette Lighter
75 Diode 3................................................................Automatic Transmission, MB
76 S/E Mode Selector Switch....................................Automatic Transmission
76-1Mode Switch........................................................Automatic Transmission
77 “B” Position Switch..............................................Automatic Transmission
78 “P” Position Switch..............................................Automatic Transmission
79 Shift Lock Solenoid Valve.....................................Automatic Transmission
8 0 TCCU
81 Ground 5.............................................................Gasoline E/G
81-1Ground 7.............................................................Diesel E/G
82 Seat Extension Wiring Connector
83 Transmission Extension Wiring Connector...........E23 & E32 Gasoline E/G with Manual Transmission
83-1 Transmission Extension Wiring Connector...........Diesel E/G with MB A/T
84 Transmission Extension Wiring Connector...........Gasoline E/G with Manual Transmission
84-1 Transmission Extension Wiring Connector...........Diesel E/G with Manual Transmission or BTRE A/T
85 Transmission Extension Wiring Connector...........E23 & E32 Gasoline E/G with A/T
85-1 Transmission Extension Wiring Connector...........Diesel E/G with BTRE A/T
86 Transfer Case Motor
87 Transfer Case Motor
88 Vehicle Speed Sensor
89 Fuel Gauge
90 Acceleration Sensor.............................................ABS 5.0
91 Seat Belt Switch (Passenger)
92 Seat Heater Switch
93 Head Lamp Leveling Device Switch.....................Leveling Device

9A-10 BODY WIRING SYSTEM
94 Seat Belt Switch (Driver)
95 Seat Belt Switch (Dirver)
96 Parking Brake Switch
97 Rear Cigarette Lighter
9 8 OVPR.................................................................Gasoline E/G
99 LH Side Repeater...............................................Rear Fog Lamp
100 Engine Wiring Connector
101 Engine Joint Connector
102 Engine Joint Connector......................................Gasoline E/G
103 ECS Engine Wiring Connector...........................Diesel E/G & Gasoline E/G with HFM ECU
104 ABD Engine Wiring Connector...........................ABD 5.0
105 ABD Engine Wiring Connector...........................ABD 5.0
105-1ABS Engine Wiring Connector............................ABS 5.0
106 Canister Purge Solenoid Valve...........................Gasoline E/G with MSE ECU
106-1Canister Purge Solenoid Valve...........................E20 & E23 Gasoline E/G with FHM ECU
107 Econo/Standard Solenoid Valve.........................Gasoline E/G with Automatic Transmission
108 CO Potentio Meter..............................................Gasoline E/G with HFM ECU & CO Potentio Meter
109 Front Wiper Motor
11 0 O
2 Sensor...........................................................E20 or E23 Gasoline E/G
111 RH Side Repeater
112 Engine Wiring Connector
113 Vertical Sensor
114 Lateral Sensor
115 Diagnosis
11 6 Joint Box.............................................................Gasoline E/G (E32)
117 Canister Purge Solenoid Valve...........................E32 Gasoline E/G with HFM ECU
118 Led Antenna......................................................Rolling code type Immobilizer
119 E-key Connector................................................Gasoline E/G with Rolling Code Type Immobilizer
120 Receiver Unit......................................................Gasoline E/G with Rolling Code Type Immobilizer
121 Receiver Unit......................................................Gasoline E/G with Rolling Code Type Immobilizer
122 Receiver Antenna..............................................Gasoline E/G with Rolling Code Type Immobilizer
123 Receiver Connector...........................................Gasoline E/G with Rolling Code Type Immobilizer
124 ICU Connector....................................................Gasoline E/G with Rolling Code Type Immobilizer
125 ICU .....................................................................Gasoline E/G with TOD (MSE ECU 3.2 Engine Only)
126 CAN Line............................................................Gasoline E/G with TOD (MSE ECU 3.2 Engine Only)
127 TOD ...................................................................Gasoline E/G with TOD (MSE ECU 3.2 Engine Only)
128 TOD ...................................................................Gasoline E/G with TOD (MSE ECU 3.2 Engine Only)
129 Transfer Case Speed Sensor.............................Gasoline E/G with TOD (MSE ECU 3.2 Engine Only)
130 Engine Main Wiring Connector...........................Gasoline E/G with MSE ECU
131 Remote Engine Start..........................................Diesel E/G with A/T & Black Out Lamp
132 Remote Engine Start..........................................Diesel E/G with A/T & Black Out Lamp
133 TCU ....................................................................Diesel E/G with BTRE A/T
134 TCU ....................................................................Diesel E/G with BTRE A/T
135 Ground 5............................................................Diesel E/G
136 Start Protection Relay.........................................Diesel E/G with Rolling Code Type Immobilizer
137 EGR control unit.................................................Diesel E/G
1 3 8 ICU 1..................................................................Diesel E/G with Rolling Code Type Immobilizer
1 3 9 ICU 2..................................................................Diesel E/G with Rolling Code Type Immobilizer
140 Injection Pump Valve Extension..........................Diesel E/G with Rolling Code Type Immobilizer
141 Injection Pump Valve Extension..........................Diesel E/G with Rolling Code Type Immobilizer
142 EGR Solenoid....................................................Diesel E/G
143 ICU led................................................................Diesel E/G with Rolling Code Type Immobilizer
144 Immobilizer Solenoid Valve..................................Diesel E/G with Crypto Type Immobilizer
147 Immobilizer Unit...................................................Diesel E/G with Crypto Type Immobilizer

BODY WIRING SYSTEM 9A-11
ENGINE ROOM
1 Engine Room Relay Box
1.1 Main Wiring Connector
1.2 Main Wiring Connector
1.3 Main Wiring Connector........................................Gasoline E/G
1.4 Joint
1.5 Compressor, Condenser Fan Relay.....................Diesel E/G
1.6 Condenser Fan Relay 2
1.7 Air Conditioner Relay
1.8 Resistor with Diode..............................................Gasoline E/G
1.9 Front Fog Lamp Relay
1.10 Condenser Fan Relay 1
1.11 Tail Lamp Relay
1.12 Horn Relay
2 Octane Selector...................................................Gasoline E/G with HFM
3 Preheating Unit....................................................Diesel E/G
4 Preheating Timer Unit..........................................Diesel E/G
5 ECS Main Wiring Connector................................ ECS
6 Brake Leveling Fluid Sensor
7 ABD Main Wiring Connector................................ABD 5.0
7-1 ABS Main Wiring Connector................................ABD 5.0
8 ABD main Wiring Connector................................ABD 5.0
9 Engine Temperature Sensor................................Diesel E/G
10 ABS 5.0 ECU.......................................................ABS 5.0
10-1ABD 5.0 Modulator...............................................ABD 5.0
11 Front Washer Motor.............................................Diesel E/G
12 Head Lamp Relay
13 Compressor .........................................................Air Conditioner
14 Wheel Speed Sensor...........................................ABS 5.0 or ABD 5.0

BODY WIRING SYSTEM 9A-13
FLOOR
1 ECS Main Wiring Connector........................ ECS
2 Main Wiring Connector
3 Main Wiring Connector
4 Main Wiring Connector
5 ABD Main Wiring Connector........................ ABD
6 LH Front Door Switch
7 LH Tension Reducer
8 Ground 1
9 LH Rear Door Wiring Connector
10 Wheel Speed Sensor (RL)..................ABD, ABS
11 Damper (RL)................................................ ECS
12 LH Rear Door Switch
13 LH Rear Speaker
14 Ground 2
15 Power Socket
16 Power Antenna
17 Diode
18 LH Rear Combination Lamp
19 Tail Gate Wiring Connector
20 Tail Gate Wiring Connector21 Tail Gate Wiring Connector
22 Rear Heated
23 Luggage Lamp
2 4 ABD ECU..................................................... ABD
25 Ground 4..................................................... ABD
26 ECS ............................................................. ECS
27 Wheel Speed Sensor (RR).................ABD, ABS
28 Damper (RR)............................................... ECS
29 RH Rear Door Switch
30 RH Rear Speaker
31 Ground 3
32 RH Rear Combination Lamp
33 Trailer Connector
34 Rear Washer Motor
35 RH Tension Reducer
36 RH Front Door Switch
37 RH Rear Door Wiring Connector
38 RH Front Door Wiring Connector
39 Wheel Speed Sensor (RR).................ABD, ABS
40 Acceleration Sensor..................................... ABD

9A-20 BODY WIRING SYSTEM
GASOLINE ENGINE (MSE)
1 ECU Main Wiring Connector
2 ECU Main Wiring Connector
3 Crankshaft Position Sensor
4 Oil Pressure Switch
5 Knock Sensor 2
6 Hot-Film Air Mass Sensor
7 Injector 6
8 Injector 5
9 Injector 4
10 Injector 3
11 Injector 2
12 Injector 1
13 Camshaft Adjustment Magnet14 Ignition Coil 3
15 Ignition Coil 2
16 Ignition Coil 1
17 Temperature Sensor (Gauge)
18 Double Sensor
19 Camshaft Position Sensor
20 Knock Sensor 1
21 Throttle Regulating Unit
22 Resonance Flap
23 Main Wiring Connector
2 4 ECU
25 ECU Engine Wiring Connector
26 ECU Engine Wiring Connector