Mitsubishi Montero (2002-2004). Manual — part 792

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-37

STEP 5. Check the driver's side 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.

CAUTION

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

terminals 29 and 30.
It should be open circuit.

Q: Does continuity exist?

NO : Eras the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC 26 sets, replace
the SRS-ECU. (Refer to

P.52Ba-31

.)

YES : Go to Step 6.

STEP 6. Check the harness for short circuit 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

P.00E-2

.) Then go to Step 7.

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204126

AB

CONNECTOR: F-27

F-27 (R)

CENTER
PILLAR

AC006244

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

AJ

E-07 HARNESS
CONNECTOR:
HARNESS SIDE

AC204603AC

CONNECTOR: E-19

FLOOR
CONSOLE

E-19

2

1

4

3

E-19

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-38

Q: Are 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 7.
NO : Repair the harness wires between SRS-ECU

connector E-07 and driver’s side seat belt pre-
tensioner connector F-27. Then go to Step 7.

STEP 7. Recheck for diagnostic trouble code.
Q: Is DTC 26 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

AC

CONNECTOR: F-27

F-27 (R)

CENTER
PILLAR

1 2

HARNESS
CONNECTOR:
HARNESS SIDE

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-39

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

.

AC102677

Driver's Seat Belt Pre-Tensioner (Squib)

AB

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204603AB

CONNECTOR: E-19

FLOOR
CONSOLE

E-19

AC204126

AB

CONNECTOR: F-27

F-27 (R)

CENTER
PILLAR

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-40

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:

• MB991502: Scan Tool (MUT-ll)

• MB991865: Dummy resister

• MB991866: Resister harness

STEP 1. Check the driver's seat belt pre-tensioner.
(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.52Ba-44

.) Then go to Step 3.

AC204126

AB

CONNECTOR: F-27

F-27 (R)

CENTER
PILLAR

AC006042 AY

MB991866
(RESISTOR HARNESS)

F-27 HARNESS
CONNECTOR

MB991865 (DUMMY
RESISTOR: 3

Ω

)

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