Mitsubishi Montero (2002-2004). Manual - part 789

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-25

DTC 24: Passenger’s (Front) Air Bag Module (Squib) System Fault 1 (Short Circuit between Terminals
of the Squib Circuit)

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 SRS air
bag will inflate.

• The ignition signal is input to the air bag module

via the clock spring to inflate the air bag.

DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the passenger's air
bag module (squib). However, if no DTC resets, the
SRS warning light will be switched off (DTC will be
retained).

TROUBLESHOOTING HINTS

• Improper engaged connector or defective short

bar*

• Short circuit between the passenger's air bag

module (squib) circuit terminals

• Damaged connector(s)

• Malfunction of the SRS-ECU

AC204435AB

Passenger's (Front) Air Bag Module (Squib) Circuit

NOTE

: CONNECTOR LOCK SWITCH

CONNECTOR

CONNECTED: ON
CONNECTOR

DISCONNECTED: OFF

AC204125

CONNECTOR: D-11

D-11 (R)

GLOVE BOX
STRIKER

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-26

NOTE: *: The squib circuit connectors integrate a
"short" bar (which prevents the air bag from deploy-
ing unintentionally due to static electricity by shorting
the positive wire to the ground wire in the squib cir-
cuit when the connectors are disconnected). (Refer
to

P.52Ba-2

.) Therefore, if connector E-08 or D-11 is

damaged or improperly engaged, the short bar may
not be released when the connector is connected.

DIAGNOSIS

Required Special Tools:

• MB991502: Scan Tool (MUT-II)

• 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 3.

STEP 2. Check SRS-ECU connector E-08.
Q: Is the connector correctly engaged?

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

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-27

STEP 3. Check SRS-ECU connector C-12 and passenger’s
connector C-106.
(1) Disconnect the negative battery terminal.
(2) Disconnect connectors E-08 and D-11, 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 24 set?

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

24 set as connector E-08 or D-11 was engaged
improperly.)

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

AC204125

CONNECTOR: D-11

D-11 (R)

GLOVE BOX
STRIKER

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-28

STEP 4. Check the passenger's air bag module.
(1) Disconnect the negative battery terminal.
(2) Unclip passenger’s air bag module connector D-11.

(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) Disconnect the passenger's air bag module connector D-11,

and insert special tool MB991866 into the harness
connector by backprobing.

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

diagnostic trouble code.

Q: Is DTC 24 set?

YES : Go to Step 5.
NO : Replace the passenger's air bag module. (Refer to

P.52Ba-33

.) Then go to Step 7.

AC204125

CONNECTOR: D-11

D-11 (R)

GLOVE BOX
STRIKER

AC006042 AV

MB991865 (DUMMY
RESISTOR: 3

Ω

)

MB991866
(RESISTOR HARNESS)

D-11 HARNESS
CONNECTOR

D-11 PASSENGER'S AIR BAG
MODULE CONNECTOR

Content .. 787 788 789 790 ..