Mitsubishi Montero (2004+). Manual - part 1209

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-171

STEP 2. Check SRS-ECU connector E-07.
Q: Is the connector correctly engaged?

YES : Go to Step 3.
NO :  Engage the connector correctly. Then go to Step 7.

STEP 3. Check SRS-ECU connector E-07 and side-airbag 
module (LH) connector F-15. (Using scan tool MB991958, 
read the diagnostic trouble code).
(1) Disconnect the negative battery terminal.
(2) Disconnection connectors E-07 and F-15, and then 

reconnect them.

(3) Connect the negative battery terminal.
(4) Erase diagnostic trouble code memory, and then check the 

diagnostic trouble code. 

Q: Is DTC 81 set?

YES : Go to Step 4.
NO :  The procedure is complete. (It is assumed that DTC 

81 set as connector E-07 or F-15 was engaged 
improperly).

ACX01478AJ

CONNECTOR: E-07

E-07 (Y)

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

HARNESS SIDE
CONNECTOR
(REAR VIEW)

ACX01478AJ

CONNECTOR: E-07

E-07 (Y)

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC204635 AD

CONNECTOR: F-15

F-15 (R)

1 2

HARNESS SIDE 
CONNECTOR
(REAR VIEW)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-172

STEP 4. Check the side-airbag module (LH). (Using scan 
tool MB991958, read the diagnostic trouble code).
(1) Disconnect the negative battery terminal.
(2) Disconnect the left hand side-airbag (LH) connector F-15.

(3) Connect special tool MB991865 to special tool MB991866.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly as the connector contact pressure may be 
weakened.
(4) Insert special tool MB991866 into the F-15 harness 

connector by backprobing.

(5) Connect the negative battery terminal.
(6) Erase diagnostic trouble code memory, and check the 

diagnostic trouble code. 

Q: Is DTC 81 set?

YES : Go to Step 5.
NO :  Replace the seat back assembly of the front seat (LH) 

(Refer to GROUP 52A, Front Seat 

P.52A-14

). Then 

go to Step 7.

AC204635 AD

CONNECTOR: F-15

F-15 (R)

1 2

HARNESS SIDE 
CONNECTOR
(REAR VIEW)

AC006042 AX

MB991866
(RESISTOR HARNESS)

F-15 HARNESS 
CONNECTOR

F-15 SIDE-AIRBAG 
MODULE (LH) CONNECTOR

MB991865 (DUMMY 
RESISTOR: 3 

Ω)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-173

STEP 5. Check the side-airbag module (LH) circuit at the 
SRS-ECU connector E-07.
(1) Disconnect SRS-ECU connector E-07.

DANGER

To prevents the air bag from deploying unintention-
ally, disconnect the side-airbag module (LH) connec-
tor F-15 to short the squib circuit.

(2) Disconnect side-airbag module connector F-15.

CAUTION

Insert an insulator such as a cable tie to a depth of 4mm 
(0.16 inch) or more, otherwise the short spring will not 
cable tie release.
(3) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch) 

thick] between terminals 21, 22 and the short spring to 
release the short spring.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly as the connector contact pressure may be 
weakened.
(4) Check for continuity between terminals 21 and 22.

It should be open circuit.

Q: Is the circuit normal? 

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC 81 sets, replace 
the SRS-ECU (Refer to 

P.52B-215

).

NO :  Go to Step 6. 

ACX01478AJ

CONNECTOR: E-07

E-07 (Y)

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC204635 AD

CONNECTOR: F-15

F-15 (R)

1 2

HARNESS SIDE 
CONNECTOR
(REAR VIEW)

AC100397AP

A

A

E-07 HARNESS SIDE
CONNECTOR (REAR VIEW)

TERMINAL

SHORT SPRING

4 mm (0.16 inch) OR MORE

SECTION
A - A

CABLE TIE

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

AC100386

E-07 HARNESS SIDE
CONNECTOR (REAR VIEW)

AO

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-174

STEP 6. Check the harness wires for short circuit between 
SRS-ECU connector E-07 (terminal No.21and 22) and 
side-airbag module (LH) connector F-15 (terminal No.1 and 
2).
Q: Are the harness wires between SRS-ECU connector 

E-07 (terminal No.21and 22) and side-airbag module 
(LH) connector F-15 (terminal No.1 and 2) in good 
condition?
YES : Go to Step 7.
NO :  Repair the harness wires between SRS-ECU 

connector E-07 and side-airbag module (LH) 
connector F-15. Then go to Step 7.

STEP 7. Recheck for diagnostic trouble code. 
Q: Is DTC 81 set?

YES : Return to Step 1.
NO :  The procedure is complete. (If no malfunctions are not 

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.00-6

).

ACX01478AJ

CONNECTOR: E-07

E-07 (Y)

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC204635 AD

CONNECTOR: F-15

F-15 (R)

1 2

HARNESS SIDE 
CONNECTOR
(REAR VIEW)