Mitsubishi L200. Manual — part 592
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-39
is "ON" position.
13 14 15 16 17 18 19 20
5 6 7 8 9 10 11 12
1 2
3 4
AC006044
C-131
Harness side connector
(rear view)
AU
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-131
harness side connector terminals 9 and 10.
OK: Open circuit
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the harness wires between SRS-
ECU connector C-131 (terminal No.9 and
10) and passenger’s (front) air bag module
connector C-02 (terminal No.1 and 2).
STEP 7. Check whether the diagnosis code is
reset.
Q: Is diagnosis code B1410 set?
YES :
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-40
Code No.B1411: Passenger's (front) air bag module (squib) system (open-circuited in the squib
circuit)
IND
AC805767
PASSENGER'S (FRONT)
AIR BAG MODULE
(SQUIB)
PASSENGER'S AIR BAG
CUT OFF SWITCH
SRS-ECU
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
AC
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 passenger’s (front) air
bag squib wire(s) are open-circuited.
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-41
PROBABLE CAUSES
• Open circuit in the passenger's (front) air bag
module (squib) circuit
• Improper connector contact
• 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 B1411 set?
YES :
Go to Step 3 .
NO :
Replace the passenger's (front) air bag
module (Refer to
STEP 3. Resistance measurement between SRS-
ECU connector C-131 (terminal No.9 and 10) and
the passenger's (front) air bag module connector
C-02 (terminal No.1 and 2).
(1) Disconnect the negative battery terminal.
AC501670
AB
C-131 (Y)
Connector: C-131
Harness side
connector
(rear view)
(2) Disconnect SRS-ECU connector C-131.
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-42
lock.
AC006036
Section
A - A
C-131Harness side connectors
(front view)
Cable tie
Short spring
4 mm or more
Terminal
BC
A
A
CAUTION
Insert an insulator such as a cable tie to a depth
of 4 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 9, 10 and the short spring to
release the short spring.
(5) Check that the passenger's air bag cut off switch
is "ON" position.
1 2
1 2
3 4
5 6 7 8 9 10 11 12
13 14 15 16
18 19 20
17
AC100349
C-131
Harness side
connector (rear view)
C-02 Harness side
connector (rear view)
AP
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-131 terminal No.9 and
the passenger’s (front) air bag module con-
nector C-02 terminal No.1
• SRS-ECU connector C-131 terminal No.10
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-131 (terminal No.9 and
10) 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 ).
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