Mitsubishi L200. Manual — part 589
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-27
STEP 3. Resistance measurement between the
SRS-ECU connector C-131 (terminal No.11 and
12) and the clock spring connector C-305
(terminal No.3 and 4)
(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.
AC903858AD
Connector: C-305 <LHD>
Harness side
connector
(front view)
C-305 (Y)
AC903869AD
Connector: C-305 <RHD>
Harness side
connector
(front view)
C-305 (Y)
C-305
DANGER
To prevents the air bag from deploying unin-
tentionally, disconnect the clock spring con-
nector C-305 to short the squib circuit.
(3) Disconnect the clock spring connector C-305.
AC100391
Section
A - A
C-131 Harness side connectors
(front view)
Cable tie
Short spring
4 mm or more
Terminal
A
BE
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 11, 12 and the short spring to
release the short spring.
AC501384
AC501384
C-131
Harness side
connector
(rear view)
C-305
Harness side
connector
(rear view)
AB
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(5) Resistance measurement between the following
terminals.
• SRS-ECU connector C-131 terminal No.11
and the clock spring connector C-305 terminal
No.3
• SRS-ECU connector C-131 terminal No.12
and the clock spring connector C-305 terminal
No.4
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.11 and
12) and clock spring connector C-305
(terminal No.3 and 4).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code B1401 set?
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-28
YES :
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).
Code No.B1402: Driver's air bag module (squib) system (short-circuited to the earth)
AC806117
Driver's Air Bag Module (Squib) Circuit
AIR BAG MODULE
(SQUIB)
(DRIVER'S SIDE)
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
CLOCK SPRING
SRS-ECU
CONNECTOR
LOCK SWITCH
NOTE
: 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
AB
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
via the clock spring to inflate the air bag.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if the driver's air bag squib
wire(s) are short-circuited to the earth.
PROBABLE CAUSES
• Malfunction of the clock spring
• Damaged harness wires and connectors
• Short to the earth in the driver's air bag module
(squib) harness
• Malfunction of the SRS-ECU
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-29
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.
AC501669
A
C-303 Air bag
module connector
AB
(2) By sliding the A section (in the figure) of air bag
module connector C-303 in arrow direction,
disconnect the connector.
AC303006AF
C-303 Air bag
module
connector
MB991865
(Dummy
resistor : 3 )
MB991866
(Resistor harness)
(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 clock spring
side air bag module connector C-303 by
backprobing.
(5) Connect the negative battery terminal.
(6) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code B1402 set?
YES :
Go to Step 2.
NO :
Replace the driver’s air bag module (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.
AC903858AD
Connector: C-305 <LHD>
Harness side
connector
(front view)
C-305 (Y)
AC903869AD
Connector: C-305 <RHD>
Harness side
connector
(front view)
C-305 (Y)
C-305
(2) Disconnect the clock spring connector C-305.
AC303587AN
C-305 Clock spring
connector
MB991865
(Dummy resistor: 3 )
MB991866
(Resistor harness)
(Rear view)
(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 clock spring
harness side connector C-305 (terminal No.3 and
4) by backprobing.
(5) Connect the negative battery terminal.
(6) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code B1402 set?
YES :
Go to Step 3.
NO :
Replace the clock spring (Refer to
).
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-30
STEP 3. Resistance measurement at the SRS-
ECU connector C-131.
(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.
AC903858AD
Connector: C-305 <LHD>
Harness side
connector
(front view)
C-305 (Y)
AC903869AD
Connector: C-305 <RHD>
Harness side
connector
(front view)
C-305 (Y)
C-305
DANGER
To prevents the air bag from deploying unin-
tentionally, disconnect the clock spring con-
nector C-305 to short the squib circuit.
(3) Disconnect the clock spring connector C-305.
AC100391
Section
A - A
C-131 Harness side connectors
(front view)
Cable tie
Short spring
4 mm or more
Terminal
A
BE
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 11, 12 and the short spring to
release the short spring.
AC006256
13 14 15 16 17 18 19 20
5 6 7 8 9 10 11 12
1 2
3 4
AW
C-131 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.
(5) Check for continuity between C-131 harness side
connector terminals 11, 12 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-131 (terminal No.11 and
12) and clock spring connector C-305
(terminal No.3 and 4).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code B1402 set?
YES :
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).
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