Mitsubishi Montero (2004+). Manual — part 1204

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-151

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 (RH) connector F-21. (Using scan tool MB991958,
read the diagnostic trouble code).
(1) Disconnect the negative battery terminal.
(2) Disconnection connectors E-07 and F-21, and then

reconnect them.

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

diagnostic trouble code.

Q: Is DTC 71 set?

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

71 set as connector E-07 or F-21 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)

ACX01649

X0942CA

AF

CONNECTOR: F-21

F-21 (R)

1 2

HARNESS SIDE
CONNECTOR
(REAR VIEW)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-152

STEP 4. Check the side-airbag module (RH). (Using scan
tool MB991958, read the diagnostic trouble code).
(1) Disconnect the negative battery terminal.
(2) Disconnect the side-airbag module (RH) connector F-21.

(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-21 harness

connector by backprobing.

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

diagnostic trouble code.

Q: Is DTC 71 set?

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

(RH) (Refer to GROUP 52A, Front Seat

P.52A-14

).

Then go to Step 7.

ACX01649

X0942CA

AF

CONNECTOR: F-21

F-21 (R)

1 2

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC006042 AW

MB991866
(RESISTOR HARNESS)

F-21 HARNESS
CONNECTOR

F-21 SIDE-AIRBAG
MODULE (RH) CONNECTOR

MB991865 (DUMMY
RESISTOR: 3

Ω)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-153

STEP 5. Check the side-airbag module (RH) 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 (RH) connec-
tor F-21 to short the squib circuit.

(2) Disconnect side-airbag module connector F-21.

CAUTION

Insert an insulator such as a cable tie to 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 23, 24 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 E-07 harness connector

terminals 23 and 24.
It should be open circuit.

Q: Does continuity exist?

YES : Go to Step 6.
NO : Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC 71 sets, replace
the SRS-ECU (Refer to

P.52B-215

). Then go to Step

7.

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)

ACX01649

X0942CA

AF

CONNECTOR: F-21

F-21 (R)

1 2

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC100396AP

A

A

E-07 HARNESS SIDE
CONNECTOR
(REAR VIEW)

TERMINAL

CABLE
TIE

SECT-
ION
A - A

4 mm (0.16 inch) OR MORE

SHORT SPRING

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

AC100764

E-07 HARNESS SIDE
CONNECTOR
(REAR VIEW)

AO

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-154

STEP 6. Check the harness wires for short circuit between
SRS-ECU connector E-07 (terminals No.23 and 24) and
side-airbag module (RH) connector F-21 (terminal No.1 and
2)
Q: Are the harness wires between SRS-ECU connector

E-07 (terminals No.23 and 24) and side-airbag module
(RH) connector F-21 (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 connector
F-21. Then go to Step 7.

STEP 7. Recheck for diagnostic trouble code.
Q: Is DTC 71 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)

ACX01649

X0942CA

AF

CONNECTOR: F-21

F-21 (R)

1 2

HARNESS SIDE
CONNECTOR
(REAR VIEW)