Mitsubishi L200. Manual — part 632
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-199
DIAGNOSIS PROCEDURE
STEP 1. Check the diagnosis code by connecting
a dummy resistor. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.
AC903885AR
Connector: D-33 <LHD>
Harness side
connector
(rear view)
D-33 (B)
AC903886 AM
Connector: D-33 <RHD>
Harness side
connector
(rear view)
D-33 (B)
AC609928AM
Locking
button
Flat-tipped
screwdriver
Inflator
D-33 Harness side
connector (2-pin, black)
(2) Use the flat-tipped screwdriver to pull out the
locking button of D-33 harness side connector to
the direction of the arrow. After releasing the lock,
disconnect the connector. Then, reconnect the
connector.
AC301553
D-33 Harness
side connector
CM
MB991865
(Dummy resistor: 3 )
MB991884
(Resistor harness)
(3) Connect the dummy resistor (Special tool:
MB991865) to the resistor harness (Special tool:
MB991884).
(4) Connect special tool (MB991884) to the D-33
harness side connector.
(5) Connect the negative battery terminal.
(6) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code B1451 set?
YES :
Go to Step 2 .
NO :
Replace the curtain air bag module (LH)
(Refer to
).
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-200
STEP 2. Resistance measurement between SRS-
ECU connector C-153 (terminal No.1 and 2) and
the curtain air bag module (LH) connector D-33
(terminal No.1 and 2).
(1) Disconnect the negative battery terminal.
AC801404
AL
Connector: C-153
C-153 (Y)
Harness side
connector
(rear view)
(2) Disconnect SRS-ECU connector C-153.
DANGER
To prevents the air bag from deploying unin-
tentionally, disconnect the curtain air bag
module (LH) connector D-33 to short the
squib circuit.
AC903885AR
Connector: D-33 <LHD>
Harness side
connector
(rear view)
D-33 (B)
AC903886 AM
Connector: D-33 <RHD>
Harness side
connector
(rear view)
D-33 (B)
AC609928AM
Locking
button
Flat-tipped
screwdriver
Inflator
D-33 Harness side
connector (2-pin, black)
(3) Use the flat-tipped screwdriver to pull out the
locking button of D-33 harness side connector to
the direction of the arrow. After releasing the lock,
disconnect the connector. Then, reconnect the
connector.
AC801566
Section
A - A
C-153 Harness side connectors
(front view)
Cable tie
Terminal
7 mm or more
AF
Short spring
A
A
CAUTION
Insert an insulator such as a cable tie to a depth
of 7 mm or more, otherwise the short spring will
not be released.
(4) Insert a cable tie [3 mm wide, 0.5 mm thick]
between terminals 1, 2 and the short spring to
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-201
release the short spring.
AC201287FB
D-33 H
arness side
connector
MB991884
(5) Connect D-33 harness side connector to special
tool resistor harness (MB991884).
AC800962BV
C-153
Harness side
connector
(rear view)
Special tool
MB991884
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(6) Resistance measurement between the following
terminals.
• SRS-ECU connector C-153 terminal No.1 and
special tool terminal No.2
• SRS-ECU connector C-153 terminal No.2 and
special tool terminal No.1
OK: Continuity (Less than 2
Ω)
Q: Are the check results normal?
YES :
Go to Step 3 .
NO :
Repair the harness wires between SRS-
ECU connector C-153 (terminal No.1 and 2)
and curtain air bag module (LH) connector
D-33 (terminal No.1 and 2).
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code B1441 set?
YES :
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-202
Code No.B1452: Curtain air bag module (LH) (squib) system (short-circuited to the earth)
AC805930
LH CURTAIN AIR BAG
DRIVE CIRCUIT
NOTE
: CONNECTOR LOCK SWITCH
CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver
CURTAIN AIR BAG MODULE
(SQUIB) (LH)
AD
SRS-ECU
Curtain Air Bag Module (Squib) (LH) Circuit
OPERATION
The SRS-ECU judges how severe a collision is by
detecting signals from the left and right side impact
sensors. If the impact is over a predetermined level,
the SRS-ECU sends an ignition signal. At this time, if
the side-airbag safing G-sensor is on, the curtain air
bag module will deploy.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if the curtain air bag (LH)
squib wire(s) are short-circuited to the earth.
PROBABLE CAUSES
• Damaged harness wires and connectors
• Short to the earth in the curtain air bag module
(LH) (squib) harness
• Malfunction of the SRS-ECU
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