Mitsubishi 380. Manual - part 773

 

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Mitsubishi 380. Manual - part 773

 

 

SERVICE PRECAUTIONS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-16

SERVICE PRECAUTIONS

M1524000300499

DANGER

In order to avoid injury to yourself or others from 
accidental deployment of the air bag during servic-
ing, read and carefully follow all the precautions 
and procedures described in this manual.

After disconnecting the battery cable, wait 60 sec-
onds or more before proceeding with the following 
work. The SRS system is designed to retain 
enough voltage to deploy the air bag for a short 
time even after the battery has been disconnected, 
so serious injury may result from unintended air 
bag deployment if work is done on the SRS system 
immediately after the battery cables are discon-
nected.

WARNING

Battery posts, terminals and related accessories 
contain lead and lead compounds. WASH HANDS 
AFTER HANDLING.

Do not use any electrical test equipment on or near 
the SRS components, except those specified on 

P.52B-224

.

Never Attempt to Repair the Following Compo-
nents: SRS-ECU, Clock Spring, Air Bag Module, 
Front impact sensor, Side Impact Sensor, Seat Belt 
with Pre-tensioner, Front seat assenbly. If any of 
these components are diagnosed as faulty, they 
should only be replaced, in accordance with the 
INDIVIDUAL COMPONENT SERVICE procedures in 
this manual, starting on 

P.52B-230

.

Do not attempt to repair the wiring harness con-
nectors of the SRS. If any of the connectors are 
diagnosed as faulty, replace the wiring harness. If 
the wires are diagnosed as faulty, replace the wir-
ing harness according to the following table.

WARNING

[SRS is a safety related item, therefore there shall be no 
attempt to repair any component or wiring harness related 
to SRS]
 

.

ACX00583

INSULATING TAPE

BATTERY

BATTERY CABLE (–)

AC

63

55

51

69

61

66

58

65

64

5657

68

60

67

59

70

62

53

52 B A

54

A

B

18

10

15

7

13

5

14

6

16

8

17

9

19

11

20

12

1 2

3 4

42

31

38

27

21

41

28

39

22

30

25

47

36

33

44

34

45

37

48

26

29

23

40

32

43

35

46

24

B

A

AC3001278AB

SRS-ECU CONNECTOR

SERVICE PRECAUTIONS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-17

NOTE: *Vehicles with side-airbags

.

SRS-ECU TERMINAL 
NO.

DESTINATION OF HARNESS

CORRECTIVE ACTION

7, 8

Floor wiring harness 

→ Seat belt 

pre-tensioner (LH)

Replace the floor wiring harness.

9*, 10*

Floor wiring harness 

→ Side-airbag 

module (LH)

Replace the floor wiring harness.

19*, 20*

Floor wiring harness 

→ Side impact 

sensor (LH)

Replace the floor wiring harness.

23

Floor wiring harness 

→ Instrument 

panel wiring harness 

→ Junction block 

(fuse No.18)

Replace each wiring harness.

24

Floor wiring harness 

→ Instrument 

panel wiring harness 

→ Junction block 

(fuse No.19)

Replace each wiring harness.

27, 28

Floor wiring harness 

→ Instrument 

panel wiring harness 

→ Clock spring → 

Air bag module (Driver's side) <1st 
squib side>

Replace each wiring harness.

32

Can line (H)

Correct or replace can line.

36, 37

Floor wiring harness 

→ Instrument 

panel wiring harness 

→  Air bag module 

(Front passenger’s side) <1st squib 
side>

Replace each wiring harness. Replace 
the clock spring.

38, 39

Floor wiring harness 

→ Instrument 

panel wiring harness 

→ Front wiring 

harness 

→ Front impact sensor (RH)

Replace each wiring harness.

43

Can line (L)

Correct or replace can line.

46

Floor wiring harness 

→ Ground

Replace the floor wiring harness.

47, 48

Floor wiring harness 

→ Instrument 

panel wiring harness 

→ Front impact 

sensor (LH)

Replace each wiring harness.

57*, 58*

Floor wiring harness 

→ Side-airbag 

module (RH)

Replace the floor wiring harness.

59, 60

Floor wiring harness 

→ Seat belt 

pre-tensioner (RH)

Replace the floor wiring harness.

63*, 64*

Floor wiring harness 

→ Side impact 

sensor (RH)

Replace the floor wiring harness.

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-18

WARNING

Inspection of the SRS-ECU connector harness 
should be carried out by the following procedure. 
Insert the testprobe tool into connector from har-
ness side (rear side), and connect the tester to 
testprobe tool. If any tool other than testprobe tool 
is used, it may cause damage to the harness and 
other components. Furthermore, measurement 
should not be carried out by touching the 
testprobe tool directly against the terminals from 
the front of the connector. The terminals are plated 
to increase their conductivity, so if they are 
touched directly by the testprobe tool, the plating 
may break, which will decrease reliability.

The SRS components and seat belt with pre-ten-
sioner should not be subjected to heat, so remove 
the SRS-ECU, driver’s and front passenger’s air 
bag modules, clock spring, side-airbag modules, 
and seat belt pre-tensioner before drying or baking 
the vehicle after painting.

SRS-ECU, air bag module, clock spring: 93

° C 

(200

° F) or more

Seat belt with pre-tensioner 90

°C (194° F) or 

more

After servicing the SRS system, check the warning 
light operation to make sure that the system func-
tions properly. (Refer to 

P.52B-3

).

Make certain that the ignition switch is in the 
"LOCK"(OFF) position when the diagnostic tool is 
connected or disconnected.

SRS AIR BAG DIAGNOSIS

INTRODUCTION TO DIAGNOSIS

M1524005000330

The SRS system is controlled by the SRS-ECU. The 
SRS-ECU judges how severe a collision is by detect-
ing signals from the left and right front impact sen-
sors and side impact sensors, front air bag analog 
G-sensor and front air bag safing G-sensor and 
side-airbag safing G-sensor. If the impact is over a 
predetermined level, the SRS-ECU sends an ignition 
signal. At this time, if the safing G-sensor is on, the 
SRS air bag will inflate. The SRS warning light in the 
combination meter alerts a malfunction of the SRS 
system. If the following symptoms occur even when 
the vehicle has not been in a collision, there may be 
a malfunction in the SRS system.

• The SRS warning light does not go off within 

approximately seven seconds after the ignition 
switch has been turned to the "ON" position.

• The SRS warning light does not illuminate when 

the ignition switch is turned to the "ON" position.

Refer to Post-collision Diagnosis when inspecting 
and servicing a vehicle that has been in a collision 
(Refer to 

P.52B-225

).

24DB067A

AC301599

AC300928

SRS-HARNESS CONNECTOR

SRS-ECU HARNESS CONNECTOR
(REAR SIDE)

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-19

TROUBLESHOOTING STRATEGY

M1524003100654

Use these steps to plan your diagnostic strategy. If 
you follow them carefully, you will be sure that you 
have exhausted all of the possible ways to find a 
SRS fault.
1. Gather information about the problem from the 

customer.

2. Verify that the condition described by the 

customer exists.

3. Check the vehicle for any SRS diagnostic trouble 

codes (SRS DTC).

4. If you cannot verify the condition but there are no 

SRS DTCs, the malfunction is intermittent. Refer 
to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How 

to Cope with Intermittent Malfunctions .

5. If there is a SRS DTC, record the code number, 

then erase the code from vehicle memory using 
diagnostic tool (MUT-III Sub Assembly) 
MB991958.

6. Recreate the SRS DTC set conditions to see if the 

same SRS DTC will be set again.

• If the same SRS DTC is set again, follow the 

Inspection Chart for the DTC and find the fault.

• If you cannot get the same SRS DTC to be set 

again, the malfunction is intermittent. Refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points 

− How to Cope with Intermit-

tent Malfunctions .

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

DIAGNOSTIC FUNCTION

M1524013800074

HOW TO CONNECT THE DIAGNOSTIC TOOL 
(MUT-III)

Required Special Tools:

•  MB991958: diagnostic tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A (Vehicles with CAN 

communication system)

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
1. Ensure that the ignition switch is at the "LOCK" (OFF) 

position.

2. Start up the personal computer.

3. Connect special tool MB991827 to special tool MB991824 

and the personal computer.

4. Connect special tool MB991910 to special tool MB991824.

5. Connect special tool MB991910 to the data link connector.

6. Turn the power switch of special tool MB991824 to the "ON" 

position.

NOTE: When special tool MB991824 is energised, special 
tool MB991824 indicator light will be illuminated in a green 
color.

7. Start the MUT-III system on the personal computer.

NOTE: Disconnecting diagnostic tool MB991958 is the reverse 
of the connecting sequence, making sure that the ignition 
switch is at the "LOCK" (OFF) position.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

 

 

 

 

 

 

 

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