Mitsubishi Montero (2004+). Manual - part 1181

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-59

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

(4) 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.52B-215

). Then go to Step

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

ACX01478AM

CONNECTOR: E-08

E-08 (Y)

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC204125

CONNECTOR: D-11

D-11 (R)

GLOVE BOX
STRIKER

1 2

HARNESS SIDE
CONNECTOR
(REAR VIEW)

1 2

3 4

5 6 7 8 9 10 11 12

13 14 15 16

18 19 20

AC100349

E-08 HARNESS SIDE
CONNECTOR
(REAR VIEW)

D-11 HARNESS SIDE
CONNECTOR (REAR VIEW)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-60

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

SEAT BELT
PRETENSIONER
(LH)

MICROCOMPUTER

AIR BAG DRIVE CIRCUIT

SRS-ECU

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-61

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 engaged connector or defective short

spring*

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

sioner (squib) circuit terminals

• Damaged connector(s)

• Malfunction of the SRS-ECU

NOTE: *: The squib circuit connectors integrate a
"short" spring (which prevents the air bag from
deploying unintentionally due to static electricity by
shorting the positive wire to the ground wire in the
squib circuit when the connectors are disconnected)
(Refer to

P.52B-3

). Therefore, if connector E-07 or

F-27 is damaged or improperly engaged, the short
spring may not be released when the connector is
connected.

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

CONNECTOR: F-27

F-27 (R)

CENTER
PILLAR

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-62

STEP 1. Check the diagnostic trouble code.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOOK (OFF)" position.
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.

AC307591 AB

MB991911

DATA LINK

CONNECTOR

MB991824

MB991827

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)

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