Mitsubishi Montero (2002-2004). Manual — part 791

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-33

STEP 2. Check the harness for open circuit between SRS-
ECU connector E-08 (terminal No.9 and 10) and the
passenger's side air bag module connector D-11 (terminal
No.1 and 2).
(1) Unclip passenger’s air bag module connector D-11.
(2) Disconnect SRS-ECU connector E-08 and passenger's air

bag module connector D-11.

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 the following terminals.

Between connector E-08 terminal 9 and connector D-11
terminal 1
Between connector E-08 terminal 10 and connector D-11
terminal 2
It should be less than 2 ohms.

Q: Does continuity exist?

YES : Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC 25 sets, replace
the SRS-ECU. (Refer to

P.52Ba-31

.) Then go to Step

3.

NO : Repair the harness wires between SRS-ECU

connector E-08 and passenger’s side air bag module
connector D-11. Then go to Step 3.

STEP 3. Recheck for diagnostic trouble code.
Q: Is DTC 25 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

.)

ACX01478 AD

CONNECTOR: E-08

AC204125

CONNECTOR: D-11

AC

D-11 (R)

GLOVE BOX
STRIKER

1 2

1 2

3 4

5 6 7 8 9 10 11 12

13 14 15 16

18 19 20

17

AC100349

E-08 HARNESS
CONNECTOR:
HARNESS SIDE

D-11 HARNESS CONNECTOR:
HARNESS SIDE

AH

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-34

DTC 26: Driver’s Seat Belt Pre-Tensioner (Squib) System Fault 1 (Short Circuit between Terminals of
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-35

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

• Short circuit between the driver's seat belt preten-

sioner (squib) circuit terminals

• Damaged connector(s)

• Malfunction of the SRS-ECU

.

DIAGNOSIS

Required Special Tools:

• MB991502: Scan Tool (MUT-ll)

• MB991865: Dummy resister

• MB991866: Resister harness

STEP 1. Check the diagnostic trouble code.
Q: Is DTC 34 set?

YES : Go to Step 2.
NO : Go to Step 4.

STEP 2. Check the SRS-ECU connector E-07.
Q: Is the connector correctly engaged?

YES : Go to Step 3.
NO : Engage the connector correctly. Then go to Step 7.

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-36

STEP 3. Check SRS-ECU connector E-07 and driver’s seat
belt pre-tensioner connector F-27.
(1) Disconnect the negative battery terminal.
(2) Disconnection connectors E-07 and F-27, and then

reconnect them.

(3) Connect the negative battery terminal.
(4) Erase the diagnostic trouble code memory, and check the

diagnostic trouble code.

Q: Is DTC 26 set?

YES : Go to Step 4.
NO : The procedure is complete. (It is assumed that DTC

26 set as connector E-07 or F-27 was engaged
improperly.)

STEP 4. 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 check the

diagnostic trouble code.

Q: Is DTC 26 set?

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

P.52Ba-44

). Then go to Step 7.

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204126

AB

CONNECTOR: F-27

F-27 (R)

CENTER
PILLAR

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)