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
AC
D-11 (R)
GLOVE BOX
STRIKER
ACX01478 AG
CONNECTOR: E-08
E-08 (Y)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS
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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
.) 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
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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
AC
D-11 (R)
GLOVE BOX
STRIKER
SRS AIR BAG DIAGNOSIS
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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
AC204125
CONNECTOR: D-11
AC
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
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