Mitsubishi Outlander GS45X. Manual — part 1446
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-279
NOTE: *: The squib circuit connectors integrate a
"short" spring (which prevents the seat belt pre-ten-
sioner from deploying unintentionally due to static
electricity by shorting the positive wire to the ground
wire in the squib circuit when the connectors are dis-
connected) (Refer to
). Therefore, if connec-
tor C-27 or D-130 is damaged or improperly
engaged, the short spring may not be released when
the connector is connected.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A (Vehicles with
CAN Communication System)
• MB991865: Dummy resistor
• MB991884: Resister harness
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
).
ZC501967
AC404789
AC701411AB
MB991824
MB991827
MB991910
Data link
connector
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-280
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Go to Step 3.
NO : There is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to Cope with Intermittent
Malfunction
).
STEP 3. Check SRS-ECU connector C-27 and passenger’s
seat belt pre-tensioner connector D-130. (Using scan tool
MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) While pushing the part "A" indicated in the figure of the
harness side connector, turn the lock lever to the direction
of the arrow to release the lock lever, and disconnect the
C-27 SRS-ECU connector. Then connect the connector.
(3) After disconnecting the D-130 harness side connectors,
connect the connectors again. For the D-130 connector
disconnection, use a flat-tipped screwdriver to unlock the
locking button at the harness side connector by withdrawing
it toward you in two stages, and then disconnect the
connector.
(4) Connector the negative battery terminal.
(5) Erase the diagnostic trouble code memory, and check the
diagnostic trouble code.
Q: Is DTC B1C4A set?
YES : Go to Step 4.
NO : The procedure is complete. It is assumed that DTC
B1C4A set because connector C-27 or D-130 was
engaged improperly.
ZC501967
AC404789
AC701411AB
MB991824
MB991827
MB991910
Data link
connector
AC507645
A
AC
Lock lever
AC506363AB
Seat belt
pre-tensioner
Floor wiring harness side
connector (2-pin, black)
Locking
button
Flat-tipped
screwdriver
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-281
STEP 4. Check the passenger's seat belt pre-tensioner.
(Using scan tool MB991958, read the diagnostic trouble
code.)
(1) Disconnect the negative battery terminal.
(2) While pushing the part "A" indicated in the figure of the
harness side connector, turn the lock lever to the direction
of the arrow to release the lock lever, and disconnect the
C-27 SRS-ECU connector.
(3) Disconnect passenger's seat belt pre-tensioner connector
D-130. Use a flat-tipped screwdriver to unlock the locking
button at the harness side connector by withdrawing it
toward you in two stages, and then disconnect the
connector.
(4) Connect special tool MB991865 to special tool MB991884.
(5) Connect special tool MB991884 to the D-130 harness side
connector.
(6) Connect the negative battery terminal.
(7) Erase diagnostic trouble code memory, and then check the
diagnostic trouble code.
Q: Is DTC B1C4A set?
YES : Go to Step 5.
NO : Replace the passenger's seat belt with pre-tensioner
(Refer to
). Then go to Step 7.
AC507645
A
AC
Lock lever
AC506363AB
Seat belt
pre-tensioner
Floor wiring harness side
connector (2-pin, black)
Locking
button
Flat-tipped
screwdriver
AC301553 BE
Harness side
connector
MB991865
(Dummy resistor: 3 )
MB991884
(Resistor harness)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-282
STEP 5. Check the passenger's seat belt pre-tensioner
circuit. Measure the resistance at the SRS-ECU connector
C-27.
(1) Disconnect the negative battery terminal.
(2) While pushing the part "A" indicated in the figure of the
harness side connector, turn the lock lever to the direction
of the arrow to release the lock lever, and disconnect the
C-27 SRS-ECU connector.
DANGER
To prevent the seat belt pre-tensioner from deploying
unintentionally, disconnect the passenger’s seat belt
pre-tensioner connector D-130 to short the squib cir-
cuit.
(3) Disconnect passenger's seat belt pre-tensioner connector
D-130. Use a flat-tipped screwdriver to unlock the locking
button at the harness side connector by withdrawing it
toward you in two stages, and then disconnect the
connector.
CAUTION
Insert an insulator such as a cable tie to a depth of 4mm
(0.16 inch) or more, otherwise the short spring will not be
released.
(4) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch)
thick] between terminals 43, 44 and the short spring to
release the short spring.
(5) Check for continuity between C-27 harness side connector
terminals 43 and 44.
It should be an open circuit.
Q: Is it open circuit?
YES : Erase the diagnostic trouble code memory, and check
diagnostic trouble code. If DTC B1C4A set, replace
the SRS-ECU (Refer to
). Then go to Step
7.
NO : Go to Step 6.
AC507645
A
AC
Lock lever
AC506363AB
Seat belt
pre-tensioner
Floor wiring harness side
connector (2-pin, black)
Locking
button
Flat-tipped
screwdriver
AC507303AL
A
A
C-27 Harness side
connector (front view)
Section
A - A
Cable tie
Short spring
4 mm or more
Terminal
AC608812DK
C-27 Harness side
connector (front view)
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