Mitsubishi Montero (2004+). Manual - part 1199

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-131

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

F-27.

(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 side 

connector by backprobing.

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

diagnostic trouble code.

Q: Is DTC 66 set?

YES : Go to Step 2.
NO :  Replace the driver's seat belt pre-tensioner (Refer to 

P.52B-229

). Then go to Step 4. 

AC204126

AD

CONNECTOR: F-27

F-27 (R)

CENTER 
PILLAR

1 2

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC006042 AY

MB991866
(RESISTOR HARNESS)

F-27 HARNESS 
CONNECTOR

MB991865 (DUMMY 
RESISTOR: 3 

Ω)

F-27 SEAT BELT 
PRE-TENSIONER
CONNECTOR (DRIVER'S SIDE)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-132

STEP 2. Check the driver's seat belt pretensioner circuit at 
the SRS-ECU connector E-07.
(1) Disconnect SRS-ECU connector E-07.

(2) Disconnect driver's seat belt pretensioner connector F-27.
(3) Turn the ignition switch to the "ON" position.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly as the connector contact pressure may be 
weakened.
(4) Measure the voltage between E-07 harness connector 

terminals 29, 30 and body ground.
Voltage should measure 0 volt.

Q: Is the measured voltage within the specified range?

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC 65 sets, replace 
the SRS-ECU (Refer to 

P.52B-215

). Then go to Step 

4.

NO :  Go to Step 3.

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)

AC204126

AD

CONNECTOR: F-27

F-27 (R)

CENTER 
PILLAR

1 2

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC006259

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

AR

E-07 HARNESS SIDE
CONNECTOR (REAR VIEW)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-133

STEP 3. Check the harness wires for short circuit to power 
supply between SRS-ECU connector E-07 (terminal No.29 
and 30) and driver's seat belt pre-tensioner connector F-27 
(terminal No.1 and 2).

NOTE: After inspecting intermediate connector E-19 inspect 
the wiring harness. If the intermediate connector E-19 is dam-
aged, repair or replace it (Refer to GROUP 00E, Harness Con-
nector Inspection). Then go to Step 4.
Q: Are the harness wires between SRS-ECU connector 

E-07 (terminal No.29 and 30) and driver's seat belt 
pre-tensioner connector F-27 (terminal No.1 and 2) in 
good condition?
YES : Go to Step 4.
NO :  Repair the harness wires between SRS-ECU 

connector E-07 and driver's seat belt pre-tensioner 
connector F-27. Then go to Step 4.

STEP 4. Recheck for diagnostic trouble code. 
Q: Is DTC 66 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)

AC204126

AD

CONNECTOR: F-27

F-27 (R)

CENTER 
PILLAR

1 2

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC204603AC

CONNECTOR: E-19

FLOOR 
CONSOLE

E-19

2

1

4

3

E-19

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-134

DTC 67: Driver's Seat Belt Pre-Tensioner (Squib) System Fault for Ground Circuit (Short-Circuited to 
Ground)

SEAT BELT
PRETENSIONER
(LH)

MICROCOMPUTER

AIR BAG DRIVE CIRCUIT

SRS-ECU

CONNECTOR
LOCK SWITCH

CONNECTOR
LOCK SWITCH

NOTE

: CONNECTOR
  COUPLED: ON
  CONNECTOR
  UNCOUPLED: OFF

Driver's Seat Belt Pre-Tensioner (Squib)

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204603AB

CONNECTOR: E-19

FLOOR 
CONSOLE

E-19