Mitsubishi Montero Sport (2004+). Manual — part 744

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-45

STEP 1. Check SRS-ECU connector C-24 and C-110 for
damage. If SRS-ECU connector C-24 and C-110 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector, repair or replace them.

Q: Are SRS-ECU connector C-24 and C-110 in good

condition?
YES : Replace the SRS-ECU. Refer to

P.52B-82

. Then go

to Step 2.

NO : Repair or replace them. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

. Then go to

Step 2.

AC202743

20

19

18

17

7

15

8

16

6

5

4

12

13 14

3

2

1

9 10 11

CONNECTOR: C-24

C-24 (Y)

C-24 HARNESS CONNECTOR:
HARNESS SIDE
(REAR VIEW)

AD

SRS-ECU

AC200764

24

40

31

23

41

32

42

33

29

37

28

38

22

26

21

34

25

35 36

27

39

30

C-10 (Y)

CONNECTOR:C-110

AD

C-110 HARNESS CONNECTOR:
HARNESS SIDE
(REAR VIEW)

C-110 (Y)

SRS-ECU

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-46

STEP 2. Recheck for diagnostic trouble code.
Q: Is DTC 34 set?

YES : There is no action to be taken.
NO : The procedure is complete. (If no malfunctions are

found in all steps, an intermittent malfunctions
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-7

.

DTC 35: SRS-ECU Air Bag Condition Monitor Detects Deployed Air Bag

.

DTC SET CONDITIONS
This DTC is set after the air bag has deployed. If this
code is output before the air bag has deployed, the
cause is probably a malfunction inside the
SRS-ECU.

.

TROUBLESHOOTING HINTS

• Malfunction of the SRS-ECU

DIAGNOSIS

Replace the SRS-ECU. Refer to

P.52B-82

.

DTC 39 AIR BAGS DEPLOYED SIMULTANEOUSLY

.

DTC SET CONDITIONS
This DTC will be set when the airbags deployed simulta-
neously. If this DTC is set before the deployment, a failure may
has occurred in the SRS-ECU.

.

TROUBLESHOOTING HINTS

• Malfunction of the SRS-ECU

DIAGNOSIS

Replace the SRS-ECU (Refer to

P.52B-82

).

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-47

DTC 41: IG

1

Power Circuit System (Fuse No. 7 Circuit)DTC 42: IG

1

Power Circuit System (Fuse No. 8

Circuit )

SRS-ECU Power Supply (IG1) Circuit

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-48

.

CIRCUIT OPERATION

• The SRS-ECU is powered from the ignition

switch (IG

1

).

• The SRS-ECU power is supplied from two cir-

cuits. Even if one circuit is shut off, the air bag
can inflate.

• The SRS-ECU judges how severe a collision is

by detecting signals from the left and right front
impact sensors and the analog G-sensor. If the
impact is over a predetermined level, the
SRS-ECU outputs an ignition signal. At this time,
if the safing G-sensor is on, the SRS air bag will
inflate.

.

DTC SET CONDITIONS
These DTC's are set if the voltage between the IG

1

terminals and ground is lower than a predetermined
value for a continuous period of 5 seconds or more.
However, if the vehicle condition returns to normal,
DTC's 41 or 42 will be automatically erased, and the
SRS warning light will switch off.

.

TROUBLESHOOTING HINTS

• Damaged wiring harnesses or connectors

• Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:

• MB991222: Probe

• MB991958: Scan Tool (MUT-III Sub Assembly)

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

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

AC003288

CONNECTOR: C-24

AE

SRS-ECU

C-24 (Y)

AC003299AF

CONNECTORS: D-08, D-13, D-14

JUNCTION BLOCK
(REAR)

D-13

D-14 (B)

D-08