Mitsubishi Colt Ralliart. Manual — part 548
![](/vehicles/winoney/ama/flend/gelle.png)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-30
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code 3F set?
YES :
Replace the SRS-ECU (Refer to
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction
).
Code No.4A: Curtain air bag module (squib) (LH) system (short-circuited between terminals of the
squib circuit)
OPERATION
The SRS-ECU judges how severe a collision is by
detecting signals from the side impact sensors and
the side-airbag safing G-sensor. If the impact is over
a predetermined level, the SRS-ECU sends an igni-
tion 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 one curtain air bag mod-
ule squib (LH) wire shorted to the other. However, if
no diagnosis code resets, the SRS warning lamp will
be switched off (diagnosis code will be retained).
PROBABLE CAUSES
• Improper engaged connector or defective short
spring*
• Short circuit between the curtain air bag module
(squib) (LH) circuit terminals
AC510222
CURTAIN AIR BAG
MODULE (SQUIB)
(LH)
AIR BAG
DRIVE CIRCUIT
SRS-ECU
MICRO COMPUTER
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
CONNECTOR
LOCK
SWITCH
CONNECTOR
LOCK
SWITCH
NOTE
CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF
Curtain Air Bag Module (Squib) (LH) Circuit
AB
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/nthe.png)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-31
• Damaged connector(s)
• Malfunction of the SRS-ECU
NOTE: *: The squib circuit connectors integrate a
"short" spring (which prevents the air bag from
deploying unintentionally due to static electricity by
shorting the positive wire to the earth wire in the
squib circuit when the connectors are disconnected).
Therefore, if connector B-34, C-10 or C-13 is dam-
aged or improperly engaged, the short spring may
not be released when the connector is connected.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is diagnosis code 34 set?
YES :
Go to Step 2.
NO :
Go to Step 3.
STEP 2. Connector lock check: SRS-ECU
connector B-34 (M.U.T.-III diagnosis code).
(1) Disconnect the negative battery terminal.
(2) Disconnect connectors B-34, and then reconnect
them.
(3) Connector the negative battery terminal.
(4) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code 4A set?
YES :
Go to Step 3.
NO :
The procedure is complete. It is assumed
that diagnosis code 4A set as connector
B-34 was engaged improperly.
STEP 3. Connector lock check: SRS-ECU
connector B-34, intermediate connector C-13 and
curtain air bag module connector C-10 (M.U.T.-III
diagnosis code).
(1) Disconnect the negative battery terminal.
(2) Disconnect connectors B-34, C-13 and C-10, and
then reconnect them. For connector C-10, use a
flat-tipped screwdriver to pull out the locking
button at the harness side connector, and then
disconnect the connector.
(3) Connector the negative battery terminal.
AC206285
AG
B-34 (Y)
Connector: B-34
Harness side
connector
(rear view)
343536373839404142
252627282930313233
2122
2324
AC206285
AG
B-34 (Y)
Connector: B-34
Harness side
connector
(rear view)
343536373839404142
252627282930313233
2122
2324
AC401577
Connector: C-10
C-10 (B)
Harness side
connector
(front view)
AC
AC208384BK
C-10
Curtain air bag
module connector
Flat-tipped
screwdriver
Locking button
C-10
Harness side
connector
AC209027
Connector: C-13
C-13 (R)
Quarter panel
AC
Harness side
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/puss.png)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-32
(4) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code 4A set?
YES :
Go to Step 4.
NO :
The procedure is complete. It is assumed
that diagnosis code 4A set as connector
B-34, C-13 or C-10 was engaged
improperly.
STEP 4. Check the diagnosis code by connecting
a dummy resistor (M.U.T.-III diagnosis code).
(1) Disconnect the negative battery terminal.
(2) Disconnect intermediate connector C-10
(connection between curtain air bag wring
harness and instrument panel wring 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) Connect special tool (MB991884) to the C-13
harness side connector by back probing.
(5) Connect the negative battery terminal.
(6) Erase diagnosis code memory, and then check
the diagnosis code.
Q: Is diagnosis code 4A set?
YES :
Go to Step 5.
NO :
Go to Step 6.
STEP 5. Resistance measurement at the
SRS-ECU connector B-34.
(1) Disconnect the negative battery terminal.
(2) Disconnect SRS-ECU connector B-34.
DANGER
To prevents the air bag from deploying unin-
tentionally, disconnect the curtain air bag
harness connector C-13 to short the squib
circuit.
CAUTION
Insert an insulator such as a cable tie to a depth
of 4mm or more, otherwise the short spring will
not be released.
(3) Insert a cable tie [3 mm wide, 0.5 mm thick]
between terminals 27, 28 and the short spring to
release the short spring.
AC401577
Connector: C-10
C-10 (B)
Harness side
connector
(front view)
AC
AC006042 CK
MB991866
(Resistor harness)
C-13
Intermediate h
arness side
connector
MB991865 (Dummy
resistor: 3
Ω)
C-13 Curtain air bag
module (LH) side connector
AC206285
AG
B-34 (Y)
Connector: B-34
Harness side
connector
(rear view)
343536373839404142
252627282930313233
2122
2324
AC209027
Connector: C-13
C-13 (R)
Quarter panel
AC
Harness side
AC208764
Section
A - A
B-34
Harness side connector
(front view)
Cable tie
Short spring
4 mm or more
Terminal
AE
A
A
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/keloe.png)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-33
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(4) Resistance measurement between B-34 harness
side connector terminals 27 and 28.
OK: Open circuit
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the harness wire between SRS-ECU
connector B-34 (terminal No.27 and 28) and
harness side connector C-13 (terminal No.2
and 1).
STEP 6. Resistance measurement at intermediate
connector C-13.
(1) Disconnect the negative battery terminal.
DANGER
To prevents the air bag from deploying unin-
tentionally, disconnect the curtain air bag
module connector C-10 to short the squib
circuit.
(2) Disconnect curtain air bag module connector
C-10. Use a flat-tipped screwdriver to pull out the
locking button at the harness side connector, and
then disconnect the connector.
(3) Disconnect intermediate connector C-13
(connection between curtain air bag wiring
harness and instrument panel wiring harness).
CAUTION
Insert an insulator such as a cable tie to a depth
of 4mm 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
release the short spring.
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
AC100326
34 35 36 37 38 39 40 41 42
25 26 27 28 29 30 31 32 33
21 22
23 24
AS
B-34 Harness side
connector
(rear view)
AC401577
Connector: C-10
C-10 (B)
Harness side
connector
(front view)
AC
AC208384BK
C-10
Curtain air bag
module connector
Flat-tipped
screwdriver
Locking button
C-10
Harness side
connector
AC303537
4 mm or more
C-10 Curtain air bag
module (LH) side
connector
(front view)
Terminal
Cable tie
A
Short
spring
Section
A - A
AK
A
1 2
AC303538AH
C-13 Curtain air bag module (LH)
side connector (rear view)
Main
Index
Group
TOC
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