Mitsubishi L200. Manual — part 611
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-115
lock.
AC801565
Section
A - A
C-154 Harness side connectors
(front view)
Cable tie
Terminal
7 mm or more
AE
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 21, 22 and the short spring to
release the short spring.
(5) Check that the passenger's air bag cut off switch
is "ON" position.
AC800962 BJ
C-154
Harness side
connector
(rear view)
C-02
Harness side
connector
(rear view)
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-154 terminal No.21
and the passenger’s (front) air bag module
connector C-02 terminal No.1
• SRS-ECU connector C-154 terminal No.22
and the passenger’s (front) air bag module
connector C-02 terminal No.2
OK: Continuity (Less than 2
Ω)
Q: Are the check results normal?
YES :
Go to Step 4 .
NO :
Repair the harness wires between SRS-
ECU connector C-154 (terminal No.21 and
22) and passenger’s (front) air bag module
connector C-02 (terminal No.1 and 2).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code B1411 set?
YES :
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-116
Code No.B1412: Passenger's (front) air bag module (squib) system (short-circuited to the earth)
IND
AC805798
PASSENGER'S (FRONT)
AIR BAG MODULE
(SQUIB)
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
J/B
(FUSE )
PASSENGER'S
AIR BAG
CUT OFF
INDICATOR
CONNECTOR LOCK SWITCH
CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF
NOTE
:
Passenger's (Front) Air Bag Module (Squib) Circuit
PASSENGER'S AIR BAG
CUT OFF SWITCH
AC
SRS-ECU
OPERATION
• The SRS-ECU judges how severe a collision is
by detecting signals from the front impact sensors
and the front air bag analogue G-sensor. If the
impact is over a predetermined level, the SRS-
ECU sends 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
to inflate the air bag.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if the passenger's (front)
air bag squib wire(s) are short-circuited to the earth.
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-117
PROBABLE CAUSES
• Damaged harness wires and connectors
• Short to the earth in the passenger's (front) air
bag module (squib) harness
• Malfunction of the passenger’s air bag cut off
switch
• Malfunction of the SRS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check the passenger’s air bag cut off
switch.
Check the passenger's air bag cut off switch (Refer
to
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Replace passenger’s air bag cut off switch
(Refer to
).
STEP 2. Check the diagnosis code by connecting
a dummy resistor. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.
AC509788
C-02 (R)
AC
Glove box striker
2 1
Harness side
connector
(front view)
Lock
lever
Connector: C-02
(2) Disconnect passenger’s (front) air bag module
connector C-02. Pull up the harness side lock
lever with a nail and disconnect the connector
lock.
AC300956 AP
MB991865
(Dummy resistor: 3 )
MB991866
(Resistor harness)
C-02 Passenger's
(front) air bag
module connector
C-02 Harness side
connector
(3) Connect special tool dummy resistor (MB991865)
to special tool resistor harness (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
side connector C-02 by backprobing.
(5) Check that the passenger's air bag cut off switch
is "ON" position.
(6) Connect the negative battery terminal.
(7) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code B1412 set?
YES :
Go to Step 3.
NO :
Replace the passenger's (front) air bag
module (Refer to
STEP 3. Resistance measurement at the SRS-
ECU connector C-154.
(1) Disconnect the negative battery terminal.
AC801404
AJ
Connector: C-154
C-154 (Y)
Harness side
connector
(rear view)
(2) Disconnect SRS-ECU connector C-154.
AC509788
C-02 (R)
AC
Glove box striker
2 1
Harness side
connector
(front view)
Lock
lever
Connector: C-02
DANGER
To prevents the air bag from deploying unin-
tentionally, disconnect the passenger’s
(front) air bag module connector C-02 to
short the squib circuit.
(3) Disconnect passenger’s (front) air bag module
connector C-02. Pull up the harness side lock
lever with a nail and disconnect the connector
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-118
lock.
AC801565
Section
A - A
C-154 Harness side connectors
(front view)
Cable tie
Terminal
7 mm or more
AE
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 21, 22 and the short spring to
release the short spring.
(5) Check that the passenger's air bag cut off switch
is "ON" position.
AC800962BK
C-154 Harness side connector
(rear view)
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 C-154
harness side connector terminals 21, 22 and
body earth.
OK: Open circuit
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the harness wires between SRS-
ECU connector C-154 (terminal No.21 and
22) and passenger's (front) air bag module
connector C-02 (terminal No.1 and 2).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code B1412 set?
YES :
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).
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