Mitsubishi Colt Ralliart. Manual — part 567
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-106
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) Connect the negative battery terminal.
(4) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code 71 out put?
YES :
Go to Step 4.
NO :
The procedure is complete. It is assumed
that diagnosis code 71 set as connector
B-34 was engaged improperly.
STEP 3. Connector lock check: SRS-ECU
connector B-34 and side-airbag module (RH)
connector C-25 (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.
(2) Disconnect connectors B-34 and C-25 and then
reconnect them.
(3) Connect the negative battery terminal.
(4) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code 71 out put?
YES :
Go to Step 4.
NO :
The procedure is complete. It is assumed
that diagnosis code 71 set as connector
B-34 or C-25 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 the side-airbag module (RH)
connector C-25.
(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 C-25
harness side connector by backprobing.
(5) Connect the negative battery terminal.
(6) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code 71 set?
YES :
Go to Step 5.
NO :
Replace the frame assembly of the front
seat (RH) (Refer to GROUP 52A, Front Seat
).
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
AC401575
Connector: C-25
AB
C-25 (R)
2 1
Harness side
connector
(front view)
AC401575
Connector: C-25
AB
C-25 (R)
2 1
Harness side
connector
(front view)
AC006042 CL
MB991866
(Resistor harness)
C-25 Harness side
connector
C-25 Side-airbag
module (RH) connector
MB991865 (Dummy
resistor: 3
Ω)
Main
Index
Group
TOC
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-107
STEP 5. Resistance measurement at the
SRS-ECU connector B-34
(1) Disconnect SRS-ECU connector B-34.
DANGER
To prevents the air bag from deploying unin-
tentionally, disconnect the side-airbag mod-
ule (RH) connector C-25 to short the squib
circuit.
(2) Disconnect side-airbag module connector C-25.
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 23, 24 and the short spring to
release the short spring.
(4) Measure at the wiring harness side.
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 B-34 harness
side connector terminals 23 and 24.
OK: Open circuit
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the harness wires between
SRS-ECU connector B-34 (terminal No.23
and 24) and side-airbag module (RH)
connector C-25 (terminal No.1 and 2).
STEP 6. Check whether the diagnosis code is
reset.
Q: Is diagnosis code 71 set?
YES :
Replace the SRS-ECU (Refer to
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction
).
AC206285
AG
B-34 (Y)
Connector: B-34
Harness side
connector
(rear view)
343536373839404142
252627282930313233
2122
2324
AC401575
Connector: C-25
AB
C-25 (R)
2 1
Harness side
connector
(front view)
AC100396
Section
A - A
B-34 Harness side connector
(front view)
Cable tie
Short spring
4 mm or more
Terminal
A
AW
A
34 35 36 37 38 39 40 41 42
25 26 27 28 29 30 31 32 33
21 22
23 24
AC100764
B-34 Harness side connector
(rear view)
AR
Main
Index
Group
TOC
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-108
Code No.72: Side-airbag module (squib) (RH) system (open-circuited in the squib circuit)
OPERATION
• The SRS-ECU judges how severe a collision is
by detecting signals from the left and right side
impact sensors. If the impact is over a predeter-
mined level, the SRS-ECU sends an ignition sig-
nal. At this time, if the side-airbag safing
G-sensor is on, the SRS side-airbag will inflate.
• The ignition signal is input to the side-airbag
module to inflate the side-airbag.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if the side-airbag squib
(RH) wire(s) are open-circuited. However, if no diag-
nosis code resets, the SRS warning lamp will be
switched off (diagnosis code will be retained).
PROBABLE CAUSES
• Open circuit in the side-airbag module (RH)
(squib) circuit
• Improper connector contact
• Malfunction of the SRS-ECU
AC510242
NOTE
CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF
CONNECTOR
LOCK
SWITCH
AIR BAG DRIVE
CIRCUIT
MICRO COMPUTER
SRS-ECU
SIDE-AIRBAG
MODULE
(SQUIB)
(RH)
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
Side-airbag Module (RH) (Squib) Circuit
AB
Main
Index
Group
TOC
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-109
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 the side-airbag module (RH)
connector C-25.
(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 C-25
harness side connector by backprobing.
(5) Connect the negative battery terminal.
(6) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code 72 set?
YES :
Go to Step 2.
NO :
Replace the frame assembly of the front
seat (RH) (Refer to GROUP 52A, Front Seat
).
STEP 2. Resistance measurement between
SRS-ECU connector B-34 (terminal No.23 and 24)
and the side-airbag module (RH) connector C-25
(terminal No.1 and 2)
(1) Disconnect SRS-ECU connector B-34 and
side-airbag module (RH) connector C-25.
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(2) Resistance measurement between the following
terminals.
• SRS-ECU connector B-34 terminal No.23 and
the side-airbag module (RH) connector C-25
terminal No.2
• SRS-ECU connector B-34 terminal No.24 and
the side-airbag module (RH) connector C-25
terminal No.1
OK: Continuity (Less than 2
Ω)
AC401575
Connector: C-25
AB
C-25 (R)
2 1
Harness side
connector
(front view)
AC006042 CL
MB991866
(Resistor harness)
C-25 Harness side
connector
C-25 Side-airbag
module (RH) connector
MB991865 (Dummy
resistor: 3
Ω)
AC206285
AG
B-34 (Y)
Connector: B-34
Harness side
connector
(rear view)
343536373839404142
252627282930313233
2122
2324
AC401575
Connector: C-25
AB
C-25 (R)
2 1
Harness side
connector
(front view)
34 35 36 37 38 39 40 41 42
25 26 27 28 29 30 31 32 33
21 22
23 24
1 2
AC100382
B-34
Harness side
connectors
(rear view)
C-25 Harness side connector
(rear view)
AR
Main
Index
Group
TOC
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