Mitsubishi Montero Sport (2004+). Manual - part 751

TEST EQUIPMENT

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-73

TEST EQUIPMENT

M1524000800201

SRS MAINTENANCE

M1524003900199

The SRS must be inspected by an authorized dealer up to 10 
years after the date of vehicle registration.
(Refer to GROUP 00, Maintenance Service 

P.00-60

.)

MR203491 or MB628919
SRS air bag adapter 
harness B

General service tool Deployment of air bag 

module (driver's side) 
outside the vehicle

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

AC004626

TOOL

NAME

USE

Digital multi-meter
Use a multi-meter for which the 
maximum test current is 2 mA or less at 
the minimum range of resistance 
measurement

Checking the SRS electrical circuitry with 
SRS check harness

AC000019AB

POST-COLLISION DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-74

POST-COLLISION DIAGNOSIS

M1524001100540

To inspect and service the SRS after a collision (whether or not 
the air bags have deployed), perform the following steps.

SRS-ECU MEMORY CHECK

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

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector 

(16-pin).
NOTE: If the battery power supply has been disconnected or 
disrupted by the collision, scan tool MB991958 cannot com-
municate with the SRS-ECU. Check the battery then check 
and, if necessary, repair the front wiring harness and the 
instrument panel wiring harness before proceeding.

2. Read (and write down) all displayed DTC. (Refer to 

P.52B-23

.)

3. Read the data list (fault duration and how many times 

memories are erased) using scan tool MB991958.

DATA LIST

4. Erase DTC's and after waiting 5 seconds or more read (and 

write down) all displayed DTC's. (Refer to 

P.52B-23

.)

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

DTC

SERVICE DATA ITEM

APPLICABILITY

92

Number indicating how often the 
memory is cleared

Maximum time to be stored: 250

93

How long a problem has lasted (How 
long it takes from the occurrence of 
the problem till the first air bag squib 
igniting signal.)

Maximum time to be stored: 9,999 minutes 
(approximately 7 days)

94

How long a problem has lasted (how 
long it takes from the first air bag 
squib igniting signal till now.)

POST-COLLISION DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-75

REPAIR PROCEDUR

.

WHEN AIR BAGS DEPLOYS IN A COLLISION.
1. Replace the following parts with new ones.

• Front impact sensors (Refer to 

P.52B-79

.) 

• SRS-ECU (Refer to 

P.52B-82

.)

• Air bag module (Refer to 

P.52B-84

.)

• Seat belt pre-tensioner (Refer to 

P.52B-93

.)

2. Check the following parts and replace if there are any 

malfunctions.

• Clock spring (Refer to 

P.52B-84

.)

• Steering wheel, steering column and intermediate joint

(1) Check the wiring harness (built into the steering wheel) 

and connectors for damage, and terminals for 
deformation.

(2) Install the air bag module to check fit or alignment with 

the steering wheel.

(3) Check the steering wheel for noise, binds or difficult 

operation and excessive free play.

(4) Check the steering column shaft shock absorbing 

mechanism (Refer to GROUP 37A, On-Vehicle Service 

− 

Steering Column Shaft Assembly Shock Absorbing 
Mechanism Check 

P.37A-23

).

3. Check the wiring harnesses for binding, the connectors for 

damage, poor connections, and the terminals for 
deformation. (Refer to 

P.52B-17

.)

.

WHEN AIR BAG DOES NOT DEPLOY IN LOW-SPEED 
COLLISION.
Check the SRS components. If the SRS components are show-
ing any visible damage such as dents, cracks, or deformation, 
replace them with new ones. Concerning parts removed for 
inspection, replacement with new parts and cautionary points 
for working, refer to the appropriate INDIVIDUAL COMPO-
NENT SERVICE, 

P.52B-78

.

.

Front impact sensors 
1. Check the fender shield panel for deformation or rust.
2. Check the front impact sensor for dents, cracks, deformation 

or rust. 

3. Check the sensor harnesses for binding, the connectors for 

damage, and the terminals for deformation. 

.

AC003306

FENDER
SHIELD PANEL

FRONT IMPACT
SENSOR

FORWARD

AC

POST-COLLISION DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-76

SRS-ECU
1. Check the SRS-ECU case and brackets for dents, cracks or 

deformation.

2. Check the connector for damage, and the terminals for 

deformation.

.

Air bag modules
1. Check the pad cover for dents, cracks or deformation.
2. Check the connector for damage, terminals for deformities, 

and the harness for binding.

3. Check the air bag inflator case for dents, cracks or 

deformities.

4. Install the air bag module (driver's side) to the steering 

wheel to check fit or alignment with the steering wheel.

5. Install the air bag module (front passenger's side) to the 

instrument panel and crossmember to check fit or alignment.

6. Install the air bag module cover (front passenger's side) to 

the instrument panel to check fit or alignment.

.

Clock spring
1. Check the clock spring connectors and protective tubes for 

damage, and the terminals for deformation.

2. Visually check the case for damage.

.

ACX00587AB

SRS-ECU

AC003308 AB

<DRIVER'S SIDE>

<FRONT PASSECGER'S SIDE>

CONNECTOR

INFLATOR CASE

COVER

INFLATOR CASE

CONNECTOR

AC003831AB

CASE

PROTECTIVE TUBES