Mitsubishi Montero (2004+). Manual — part 1202

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-143

STEP 3. Check the harness wires for short circuit to power
supply 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. Then go to Step 4.
Q: Are the harness wires 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) in
good condition?
YES : Go to Step 4.
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 4.

STEP 4. Recheck the diagnostic trouble code.
Q: Is DTC 68 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-144

DTC 69: Passenger's Seat Belt Pre-Tensioner (Squib) System Fault for Ground Circuit (Short-Circuit
to Ground)

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

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-145

.

CIRCUIT OPERATION
The side impact sensor includes an analog G sensor
and CPU, etc. The CPU monitors the analog G sen-
sor output signal. If the CPU judges that the side-air-
bags should be deployed, it sends a fire signal to the
SRS-ECU to deploy the side-airbags. Besides that,
the CPU diagnoses the internal components of the
side impact sensor. If a malfunction occurs, it
requests the SRS-ECU to set a diagnostic trouble
code.

.

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

.

TROUBLESHOOTING HITS

• Damaged wiring harnesses or connectors

• Short to the ground in the passenger's seat belt

pre-tensioner (squib) harness

• 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

AC204127

AB

CONNECTOR: F-29

F-29 (R)

CENTER
PILLAR

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-146

STEP 1. 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 pre-tensioner

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 the diagnostic

trouble code.

Q: Is DTC 69 set?

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

(Refer to

P.52B-229

). Then go to Step 4.

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)