Mitsubishi Montero Sport (2004+). Manual - part 742

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-37

DTC SET CONDITIONS

• These DTC's are set if there is abnormal resis-

tance between the input terminals of the front 
passenger's side air bag module (squib). The 
most likely causes for this code to be set are 
shown in the table below: 

.

TROUBLESHOOTING HINTS

• Improper engaged connector or defective short 

spring*

• Damaged wiring harnesses or connectors

• Malfunction of the front passenger's side air bag 

module (squib)

• Malfunction of the SRS-ECU

NOTE: *: The squib circuit connectors integrate a "short" spring (which prevents the air bag from deploying 
unintentionally due to static electricity by shorting the positive wire to the ground wire in the squib circuit when 
the connectors are disconnected) (Refer to 

P.52B-21

.) Therefore, if the connector is damaged or improperly 

engaged, the short spring may not be released when the connector is connected.

.

DTC

SYMPTOM

24

• Short circuit in front passenger's side air bag module (squib) or harness

25

• Open circuit in front passenger's side air bag module (squib) or harness

• Malfunction of connector contact

64

• Short circuit in front passenger's side air bag module (squib) harness leading to 

the power supply

65

• Short circuit in front passenger's side air bag module (squib) harness leading to 

the ground

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-38

DIAGNOSIS

Required Special Tools:

• 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

• MB991865: Dummy resister

• MB991866: Resister harness

STEP 1. Check the passenger’s side air bag module. 
(Using scan tool MB991958, read the diagnostic  trouble 
code.) 

(1) Connect the dummy resistor (MB991865) to the resistor 

harness (MB991866).

CAUTION

Do not directly insert a probe or other devices at the front 
of the connector to avoid a possible decrease in the con-
tact pressure.
(2) Disconnect the passenger’s side air bag module connector 

C-49 and insert the resistor harness (MB991866) behind 

the harness side connector.

(3) Connect the negative (

−) terminal of the battery.

(4) Check the diagnostic trouble code again after erasing the 

memory.

Q: Is DTC 24, 25, 64 or 65 set?

YES : Go to Step 2.
NO :  Replace the passenger’s side air bag module. (Refer 

to 

P.52B-84

.) Then go to Step 3. 

AC102572 AE

DUMMY 
RESISTOR (3

Ω)

(MB991865)

RESISTOR 
HARNESS
(MB991866)

HARNESS SIDE 
CONNECTOR

C-49 PASSENGER'S
SIDE AIR BAG MODULE 
CONNECTOR

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-39

STEP 2. Check harness wires between SRS-ECU 
connector C-24 (terminal No.9 and 10) and front 
passenger’s side air bag module connector C-49 (terminal 
No.1 and 2).

Q: Are the harness wires between SRS-ECU connector 

C-24 (terminal No.9 and 10) and passenger’s side air 
bag module connector C-49 (terminal No.1 and 2) in 
good condition? 
YES : Go to Step 3.
NO :  Repair. Then go to Step 3.

STEP 3. Recheck for diagnostic trouble code.
Q: Is any of DTC 24, 25, 64 or 65 set?

YES : Replace the SRS-ECU. Refer to 

P.52B-84

.

NO :  The procedure is complete. (If no malfunctions are 

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

− How to 

Cope with Intermittent Malfunction 

P.00-7

.)

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

AC200754

1 2

AC

CONNECTOR: C-49

C-49 HARNESS 
CONNECTOR:
HARNESS SIDE
(REAR VIEW)

C-49 (R)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-40

DTC 26: Driver's Side Seat Belt Pre-Tensioner (Squib) System Fault 1 DTC 27: Driver's Side Seat Belt 
Pre-Tensioner (Squib) System Fault 2 DTC 66: Driver's Side Seat Belt Pre-Tensioner (Squib) System 
Fault for Power Supply Circuit DTC 67: Driver's Side Seat Belt Pre-Tensioner (Squib) System Fault for 
Ground Circuit

Driber's Side Seat Belt Pretensioner Squib Circuit 

AC003288

CONNECTOR: C-110

AF

SRS-ECU

C-110 (Y)

AC004096 AC

CONNECTOR: E-62

E-62 (R)