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