Mitsubishi Grandis. Manual — part 404

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) AND SEAT BELT WITH PRE-TENSIONER

GENERAL

00-22

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) AND SEAT

BELT WITH PRE-TENSIONER

M1001009800053

The Supplemental Restraint System (SRS) and seat
belt with pre-tensioner is designed to supplement the
driver's and front passenger's seat belts to help
reduce the risk or severity of injury to the driver and
front passenger by activating and deploying both
front air bags in certain frontal collisions.
The SRS and seat belt pre-tensioner systems
consist of air bag modules, SRS-ECU, two front
impact sensors, four side impact sensors, SRS
warning lamp, clock spring, seat slide sensor,
passenser air bag cut off switch, passenger air bag
off indicator lamp and seat belt pre-tensioner. Airbag
modules are installed at the centre of the steering
wheel, on the globe box, in the front seatback and
the roof-side area (from the front pillars of driver- and
passenger-side to the rear pillar in rear area of
vehicle). Each air bag has a safing folded air bag and
an inflator. SRS-ECU, installed at the depths of the
centre console, monitors the system. The front

impact sensor is assembled in the radiator support
panel to monitor collision upon frontal impact. The
side impact sensor is assembled in the centre pillar
and quarter panel lower to monitor collision upon
side impact. The warning lamp on the instrument
panel indicates the operational status of the SRS.
The clock spring is installed in the steering column.
The seat slide sensor is attached to the seat rail and
provides the air bag control unit with information on
the seat position. The passenger air bag cut off
switch is located above inside the glove box. The
passenger air bag off indicator lamp is located above
the centre panel in the instrument panel. The seat
belt pre-tensioner is incorporated in the seat belt
retractor.
Only authorized service personnel should do work on
or around the SRS components. Those service
personnel should read this manual carefully before
starting any such work.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) AND SEAT BELT WITH PRE-TENSIONER

GENERAL

00-23

AC312274

AC310397

AC312028

AC312027

AC312026

SRS-ECU

AB

SRS warning lamp

Driver's air bag
module

Clock spring

Passenger's (front)
air bag module

Side-airbag module

Side impact sensor
(front)

Front impact sensor

Side impact sensor
(rear)

Seat belt with
pre-tensioner

Curtain air bag module

Passenger's air bag
cut off switch

Diagnosis
connector

Seat slide
sensor
<Driver's seat>

Passenger's air bag
off indicator lamp

SERVICE PRECAUTIONS

GENERAL

00-24

SERVICE PRECAUTIONS

M1001006000069

DANGER

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

CAUTION

• Do not use any electrical test equipment on or

near SRS components, except those specified
on

P.52B-12

.

• Never Attempt to Repair the Following

Components:

1. SRS air bag control unit (SRS-ECU)
2. Clock spring
3. Driver's and front passenger's air bag

modules

4. Side air bag module
5. Curtain air bag module
6. Front impact sensor
7. Side impact sensor
8. Seat belt with pre-tensioner

NOTE: If any of these components are diagnosed as
faulty, they should only be replaced, in accordance
with the INDIVIDUAL COMPONENTS SERVICE
procedures in this manual, starting at page

P.52B-218

.

CAUTION

Do not attempt to repair the wiring harness
connectors of the SRS. If a defective wiring
harness is found, repair or replace it by referring
to the table below.

63

55

51

69

61

66

58

65

64

56 57

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

AC312410

SRS-ECU connector

AB

SRS-ECU terminal No.

Destination of harness

Remedy

1, 2

Floor wiring harness

→ Seat slide

sensor

Correct or replace the floor wiring
harness.

5, 6

Floor wiring harness

→ Rear floor

wiring harness

→ Curtain air bag

module (LH)

Correct or replace each wiring
harness.

7, 8

Floor wiring harness

→ Seat belt

pre-tensioner (LH)

Correct or replace the floor wiring
harness.

9, 10

Floor wiring harness

→ Side air bag

module (LH)

Correct or replace the floor wiring
harness.

15, 16

Floor wiring harness

→ Side impact

sensor (rear) (LH)

Correct or replace the floor wiring
harness.

19, 20

Floor wiring harness

→ Side impact

sensor (front) (LH)

Correct or replace the floor wiring
harness.

21

Instrument panel wiring harness

→

Passenger’s air bag off indicator
lamp

Correct or replace the instrument
panel wiring harness.

23

Instrument panel wiring harness

→

Junction block (fuse No.3)

Correct or replace the instrument
panel wiring harness.

SERVICE PRECAUTIONS

GENERAL

00-25

24

Instrument panel wiring harness

→

Junction block (fuse No.2)

Correct or replace the instrument
panel wiring harness.

27, 28

Instrument panel wiring harness

→

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

Correct or replace the instrument
panel wiring harness.

29

Instrument panel wiring harness

→

Passenger’s air bag cut off switch
ON terminal

Correct or replace the instrument
panel wiring harness.

30, 31

Instrument panel wiring harness

→

Air bag module (Front passenger's
side) <2nd squib side>

Correct or replace the instrument
panel wiring harness.

32

Instrument panel wiring harness

→

Can_H line

Correct or replace the can line.

33, 34

Instrument panel wiring harness

→

Clock spring

→ Air bag module

(Driver's side) <2nd squib side>

Correct or replace instrument panel
wiring harness. Replace the clock
spring.

35

Instrument panel wiring harness

→

Passenger’s air bag cut off switch
COM terminal

Correct or replace the instrument
panel wiring harness.

36, 37

Instrument panel wiring harness

→

Clock spring

→ Air bag module

(Driver's side) <1st squib side>

Correct or replace instrument panel
wiring harness. Replace the clock
spring.

38, 39

Front wiring harness

→ Instrument

panel wiring harness

→ Front impact

sensor (LH)

Correct or replace each wiring
harness.

40

Instrument panel wiring harness

→

Earth

Correct or replace the instrument
panel wiring harness.

41

Instrument panel wiring harness

→

Passenger’s air bag cut off switch
OFF terminal

Correct or replace the instrument
panel wiring harness.

43

Instrument panel wiring harness

→

Can_L line

Correct or replace the can line.

44

Instrument panel wiring harness

→

Diagnosis connector

Correct or replace the instrument
panel wiring harness.

47, 48

Front wiring harness

→ Instrument

panel wiring harness

→ Front impact

sensor (RH)

Correct or replace each wiring
harness.

57, 58

Floor wiring harness

→ Side air bag

module (RH)

Correct or replace the floor wiring
harness.

59, 60

Floor wiring harness

→ Seat belt

pre-tensioner (RH)

Correct or replace the floor wiring
harness.

SRS-ECU terminal No.

Destination of harness

Remedy