Mitsubishi Montero (2004+). Manual - part 1183

 

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Mitsubishi Montero (2004+). Manual - part 1183

 

 

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-67

DTC 27: Driver’s Seat Belt Pre-Tensioner (Squib) System Fault 2 (Open in the Squib Circuit)

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

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-68

.

CIRCUIT OPERATION
The SRS-ECU judges how severe a collision is by 
detecting signals from the front impact sensors and 
the front air bag analog G-sensor. If the impact is 
over a predetermined level, the SRS-ECU outputs an 
ignition signal. At this time, if the front air bag safing 
G-sensor is on, the pre-tensioner will deploy. 

.

DTC SET CONDITIONS
This DTC is set if there is abnormal resistance 
between the input terminals of the driver's seat belt 
pre-tensioner (squib).

.

TROUBLESHOOTING HITS

• Improper connector contact

• Open circuit in the driver's seat belt pretensioner 

(squib) circuit

• Malfunction of the SRS-ECU

.

DIAGNOSIS

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 (Vehicles without 

CAN communication system)

• MB991865: Dummy resister

• MB991866: Resister harness

AC204126

AB

CONNECTOR: F-27

F-27 (R)

CENTER 
PILLAR

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-69

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 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 27 set?

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

P.52B-229

). Then go to Step 3. 

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-70

STEP 2. Check the harness for open circuit between 
SRS-ECU connector E-07 (terminal No.29 and 30) and the 
driver's seat belt pretensioner F-27 (terminal No.1 and 2).

CAUTION

Do not insert a test probe into the terminal from its front 
side directly as the connector contact pressure may be 
weakened.
(1) Disconnect SRS-ECU connector E-07 and driver's seat belt 

pretensioner connector F-27, and measure at the wiring 
harness.

(2) Check for continuity between the following terminals.

• Between connector E-07 terminal 30 and connector 

F-27 terminal 1

• Between connector E-07 terminal 29 and connector 

F-27 terminal 2

(3) It should be less than 2 ohms.
Q: Does continuity exist?

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code sets. If DTC 27 sets, 
replace the SRS-ECU (Refer to 

P.52B-215

). Then go 

to Step 3.

NO :  Repair harness wires between SRS-ECU connector 

E-07 and driver’s seat belt pre-tensioner connector 
F-27. Then go to Step 3.

STEP 3. Recheck for diagnostic trouble code. 
Q: Is DTC 27 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)

AC006245

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

1 2

E-07 HARNESS SIDE
CONNECTOR
(REAR VIEW)

F-27 HARNESS SIDE
CONNECTOR (REAR VIEW)

AG

 

 

 

 

 

 

 

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