Mitsubishi Grandis. Manual - part 989

SERVICE PRECAUTIONS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-8

23

Instrument panel wiring harness 

→ 

Junction block (fuse No.3)

Correct or replace the instrument 
panel wiring harness.

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 

→ 

Passnger’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 

→ 

Passnger’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 

→ 

Passnger’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.

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-airbag 

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

SERVICE PRECAUTIONS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-9

DANGER

After disconnecting the battery cable, wait 60 
seconds or more before proceeding with the 
following work. In addition, insulate the 
negative battery terminal with a tape. The 
condenser inside the SRS-ECU is designed 

to retain enough voltage to deploy the air 
bag for a short time even after the battery 

61, 62

Floor wiring harness 

→ Curtain air 

bag module (RH)

Correct or replace the floor wiring 
harness.

63, 64

Floor wiring harness 

→ Side impact 

sensor (front) (RH)

Correct or replace the floor wiring 
harness.

67, 68

Floor wiring harness 

→ Side impact 

sensor (rear) (RH)

Correct or replace the floor wiring 
harness.

SRS-ECU terminal No.

Destination of harness

Remedy

AC300580AB

Insulating tape

Battery

Battery cable

SERVICE PRECAUTIONS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-10

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 disconnected.

CAUTION

• The SRS components and seat belt with 

pre-tensioner should not be subjected to 
heat, so remove the SRS-ECU, driver’s and 
passenger’s (front) 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 modules, clock spring, 

impact sensors: 93

°C or more

• Seat belt with pre-tensioner: 90°C or more

• Whenever you finish servicing the SRS, 

always erase the diagnosis code and check 
warning lamp operation to make sure that the 
system functions properly.

•

If checks are carried out by using the SRS-ECU 

harness connector, observe the following 
procedures: Insert the special tool probe in 
the harness set (MB991222) into connector 
from harness side (rear side), and connect the 
tester to this probe. If any tool than special 
tool is used, damage to the harness and other 
components will result. Never insert the 
probe directly to the terminals from the front 
of the connector. The terminals are plated to 
increase their conductivity, so that if they are 

touched directly by the probe, the plating may 
break, which will cause drops in reliability.

AC311053

AC300928

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

AC

SRS-harness connector

SRS-ECU harness connector
(rear side)

MB991222

SPECIAL TOOLS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-11

SPECIAL TOOLS

M1524000700550

Tool

No.

Name

Application

MB990784

Ornament remover

Removal of cover.

MB991955
A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991825
F: MB991826

MUT-III sub-assembly
A: Vehicle 
communication 
interface (V. C. I.)
B: MUT-III USB cable
C: MUT-III main 
harness A (applicable 
to vehicles with CAN 
communication)
D: MUT-III main 
harness B (applicable 
to vehicles without CAN 
communication)
E: MUT-III 
Measurement adapter
F: MUT-III Trigger 
harness

Checking diagnosis code

CAUTION

MUT-III main harness B 
(MB991911) should be used. 
MUT-III main harness A should 
not be used for this vehicle.

MB991865

Dummy resistor

SRS air bag and seat belt with 
pre-tensioner circuit check

MB991866

Resistor harness

SRS air bag circuit check

MB990784

MB991910

MB991826

MB991955

MB991911

MB991824

MB991827

MB991825

A

B

C

D

E

F

DO NOT USED

MB991865

MB991866