Mitsubishi Colt Ralliart. Manual — part 549
![](/vehicles/winoney/ama/flend/velknge.png)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-34
(5) Resistance measurement between C-13 curtain
air bag module (LH) side connector terminals 1
and 2.
OK: Open circuit
Q: Is the check result normal?
YES :
Replace the curtain air bag module (Refer
to
NO :
Repair the harness wire between curtain air
bag module (LH) side connector C-13
(terminal No.1 and 2) and curtain air bag
module connector C-10 (terminal No.1 and
2).
STEP 7. Check whether the diagnosis code is
reset.
Q: Is diagnosis code 4A 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.4B: Curtain air bag module (squib) (LH) system (open-circuited in 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 curtain air bag module
squib <LH> wire(s) are open-circuited. However, if
no diagnosis code resets, the SRS warning lamp will
be switched off (diagnosis code will be retained).
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/urng.png)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-35
PROBABLE CAUSES
• Improper connector contact
• Open circuit in the curtain air bag module (squib)
(LH) circuit
• Malfunction of the SRS-ECU
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.
(2) Disconnect intermediate connector C-13
(connection between curtain air bag wiring
harness and instrument panel wiring 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 (MB991866) to the C-13
harness side connector by backprobing.
(5) Connect the negative battery terminal.
(6) Erase diagnosis code memory, and then check
the diagnosis code.
Q: Is diagnosis code 4B set?
YES :
Go to Step 2.
NO :
Go to Step 3.
STEP 2. Resistance measurement between
SRS-ECU connector B-34 (terminal No.27 and 28)
and harness side connector C-13 (terminal No.2
and 1).
(1) Disconnect the negative battery terminal.
(2) Disconnect SRS-ECU connector B-34.
(3) Disconnect intermediate connector C-13
(connection between curtain air bag wiring
harness and instrument panel wiring harness).
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 the following
terminals.
• SRS-ECU connector B-34 terminal No.27 and
harness side connector C-13 terminal No.2
• SRS-ECU connector B-34 terminal No.28 and
harness side connector C-13 terminal No.1
OK: Continuity (Less than 2
Ω)
AC209027
Connector: C-13
C-13 (R)
Quarter panel
AC
Harness side
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
AC208817
34 35 36 37 38 39 40 41 42
25 26 27 28 29 30 31 32 33
21 22
23 24
1 2
B-34
Harness side
connector
(rear view)
C-13 Harness side
connector
AD
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/tin.png)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-36
Q: Are the check results normal?
YES :
Go to Step 4.
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 3. Resistance measurement between
curtain air bag module (LH) side connector C-13
(terminal No.1 and 2) and the curtain air bag
module C-10 (terminal No.1 and 2).
(1) Disconnect the negative battery terminal.
(2) Disconnect harness side connector C-13 and
curtain air bag module connector C-10, and
measure at the wiring harness side. 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) Connect C-10 harness side connector to special
tool resistor harness (MB991884).
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 the following
terminals.
• curtain air bag module (LH) side connector
C-13 terminal No.1 and special tool terminal
No.2
• curtain air bag module (LH) side connector
C-13 terminal No.2 and special tool terminal
No.1
OK: Continuity (Less than 2
Ω)
Q: Are the check results normal?
YES :
Replace the curtain air bag module (Refer
to
NO :
Repair the harness wire between curtain air
bag module (LH) side connector C-13
(terminal No.1 and 2) and curtain air bag
module connector C-10 (terminal No.1 and
2).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.4B set?
YES :
Replace the SRS-ECU (Refer to
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction
).
AC401577
Connectors: C-10, C-13
C-10 (B)
Harness side
connector
(front view)
AF
C-13 (R)
Harness side
connector
AC208384BK
C-10
Curtain air bag
module connector
Flat-tipped
screwdriver
Locking button
C-10
Harness side
connector
AC201287BS
C-10
Harness side
connector
MB991884
1 2
2
1
AC303565AF
Resister harness
connector
C-13 Curtain air bag module (LH)
side connector (rear view)
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/kinesur.png)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-37
Code No.4E: Curtain air bag module (squib) (LH) system (short-circuited to the power supply)
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 the curtain air bag mod-
ule squib (LH) wire(s) are short-circuited to the power
supply.
PROBABLE CAUSES
• Damaged wiring harnesses or connectors
• Short to the power supply in the curtain air bag
module (squib) (LH) harness
• Malfunction of the SRS-ECU
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.
(2) Disconnect intermediate connector C-13
(connection between curtain air bag wiring
harness and instrument panel wiring harness).
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
AC209027
Connector: C-13
C-13 (R)
Quarter panel
AC
Harness side
Main
Index
Group
TOC
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