Mitsubishi Montero (2004+). Manual - part 1185

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-75

STEP 4. Check the passenger's seat belt pre-tensioner. 
(Using scan tool MB991958, read the diagnostic trouble 
code).
(1) Disconnect the negative battery terminal.
(2) Disconnect the passenger's seat belt pretensioner 

connector F-29.

(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 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 28 set?

YES : Go to Step 5.
NO :  Replace the passenger's seat belt pre-tensioner 

(Refer to 

P.52B-229

). Then go to Step 7. 

AC204127

AD

CONNECTOR: F-29

F-29 (R)

CENTER 
PILLAR

1 2

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC006042 AZ

MB991866
(RESISTOR HARNESS)

F-29 HARNESS 
CONNECTOR

MB991865 (DUMMY 
RESISTOR: 3 

Ω)

F-29 SEAT BELT 
PRE-TENSIONER
CONNECTOR (PASSNGER'S SIDE)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-76

STEP 5. Check the passenger's seat belt pretensioner 
circuit at the SRS-ECU connector E-07.
(1) Disconnect SRS-ECU connector E-07.

(2) Disconnect passenger's seat belt pretensioner connector 

F-29.

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 be 
released.
(3) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch) 

thick] between terminals 27, 28 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 27 and 28.
It should be open circuit.

Q: Does continuity exist?

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

the diagnostic trouble code. If DTC 28 sets, replace 
the SRS-ECU (Refer to 

P.52B-215

).

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)

AC204127

AD

CONNECTOR: F-29

F-29 (R)

CENTER 
PILLAR

1 2

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC100393

AB

AO

A

A

E-07 HARNESS SIDE
CONNECTOR (FRONT VIEW)

TERMINAL

CABLE TIE

SHORT SPRING

4 mm (0.16 inch) OR MORE

SECTION
A - A

AC100326

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

E-07 HARNESS SIDE
CONNECTOR 
(REAR VIEW)

AP

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-77

STEP 6. Check the harness for short circuit between 
SRS-ECU connector E-07 (terminal No.27 and 28) and 
passenger’s seat belt pre-tensioner connector F-29 
(terminal No.1 and 2).

NOTE: After inspecting intermediate connector E-16, inspect 
the wiring harness. If the intermediate connector E-16 is dam-
aged, repair or replace it (Refer to GROUP 00E, Harness Con-
nector Inspection 

P.00E-2

). Then go to Step 7.

Q: Are harness wires between SRS-ECU connector E-07 

(terminal No.27 and 28) connector and passenger’s seat 
belt pre-tensioner connector F-29 (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 passenger’s seat belt 
pre-tensioner connector F-29. Then go to Step 7.

STEP 7. Recheck for diagnostic trouble code. 
Q: Is DTC 28 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)

AC204127

AD

CONNECTOR: F-29

F-29 (R)

CENTER 
PILLAR

1 2

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC204603AE

CONNECTOR: E-16

FLOOR 
CONSOLE

E-16

5

4

3

2

1

E-16

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-78

DTC 29: Passenger’s (Front) Seat Belt Pre-Tensioner (Squib) System Fault 2 (Open in the Squib 
Circuit)

SEAT BELT
PRETENSIONER
(RH)

MICROCOMPUTER

AIR BAG DRIVE CIRCUIT

SRS-ECU

CONNECTOR
LOCK SWITCH

CONNECTOR
LOCK SWITCH

NOTE

: CONNECTOR
  COUPLED: ON
  CONNECTOR
  UNCOUPLED: OFF

Passenger's (Front) Seat Belt Pre-tensioner (Squib)

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204603AD

CONNECTOR: E-16

FLOOR 
CONSOLE

E-16