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)