Mitsubishi Outlander GS45X. Manual — part 1431
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-219
STEP 5. Check the side-air bag module (RH) 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 air bag from deploying unintentionally,
disconnect the side-airbag module (RH) connector
D-31 to short the squib circuit.
(3) Disconnect the D-31 side-airbag module connector, unlock
the connector by sliding the locking button to the direction of
the arrow as shown in the figure, 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 33, 34 and the short spring to
release the short spring.
(5) Measure at the wiring harness side.
(6) Check for continuity between C-27 harness side connector
terminals 33 and 34.
It should be open circuit.
Q: Is it open circuit?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1C2E sets,
replace the SRS-ECU. (Refer to
). Then go
to Step 7.
NO : Go to Step 6.
AC507645
A
AC
Lock lever
AC706606
AI
Locking button
Side-airbag
module
connector
AC507303AL
A
A
C-27 Harness side
connector (front view)
Section
A - A
Cable tie
Short spring
4 mm or more
Terminal
AC608812
C-27 Harness side
connector (front view)
CZ
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-220
STEP 6. Check the harness wires for short circuit between
SRS-ECU connector C-27 (terminal No.33 and 34) and
side-air bag module (RH) connector D-31 (terminal No.1
and 2).
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair the harness wires between SRS-ECU
connector C-27 and side-air bag module (RH)
connector D-31. Then go to Step 7.
STEP 7. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC B1C2E set?
YES : Return to Step 1.
NO : The procedure is complete.
ZC501967
AC404789
AC701411AB
MB991824
MB991827
MB991910
Data link
connector
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-221
DTC B1C33: Driver’s Lap Pre-tensioner (Squib) System (Shorted to Squib Circuit Ground)
CAUTION
If DTC B1C33 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
CIRCUIT OPERATION
The SRS-ECU judges how severe a collision is by
detecting signals from the front impact sensors and
the front air bag analog 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 lap pre-tensioner will deploy.
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the lap pre-tensioner
(squib).
.
TROUBLESHOOTING HITS
• Damaged wiring harnesses or connectors
• Short to the ground in the lap pre-tensioner
(squib) harness
• Malfunction of the SRS-ECU
SRS-ECU
Driver's Lap pre-tensioner (Squib) Circuit
CONNECTOR
LOCK SWITCH
LAP
PRE-TENSIONER
(SQUIB)
CONNECTOR
LOCK SWITCH
: CONNECTOR CONNECTED: ON
CONNECTOR DISCONNECTED: OFF
NOTE
AC901076
C-27 (Y)
AC
Connector: C-27
AC901079
Connector: D-24
AG
D-24 (B)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-222
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
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