Mitsubishi Outlander GS45X. Manual — part 1463
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-347
CAUTION
If DTC B1B78, B1B7D, B1B82 or B1B87 is set in
the occupant classification-ECU, always diag-
nose the CAN main bus lines.
.
CIRCUIT OPERATION
The load data from the weight sensor is classified
with the occupant classification-ECU, and its classi-
fied information is send to SRS-ECU by CAN bus
line. The SRS-ECU determines the air bag deploy-
ment based on this classified information, and con-
trols the power supply circuit to the inflator.
.
DTC SET CONDITIONS
This DTC is set if the weight sensor output voltage is
out of the range (guideline: 1 to 3.5 V).
.
TROUBLESHOOTING HINTS
• The weight sensor may be defective.
• Occupant classification-ECU may be defective.
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
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)
AC901079
Connectors: D-34-1, D-34-3, D-34-4, D-34-5,
D-34-6
AL
D-34-1, D-34-3,
D-34-4, D-34-5,
D-34-6
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-348
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,
).
STEP 2. 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 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 occupant classification-ECU connector
D-34-1 and weight sensor connector D-34-3, D-34-4, D-34-5
or D-34-6 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the component(s) (Refer to GROUP 00E,
Harness Connector Inspection
).
ZC501967
AC404789
AC701411AB
MB991824
MB991827
MB991910
Data link
connector
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-349
STEP 4. Check the wiring harness between occupant
classification-ECU connector D-34-1 (terminal 3, 5, 7, and
9) and weight sensors D-34-3, D-34-4, D-34-5, and D-34-6
(terminal 3).
Q: Is the check result normal?
YES : Go to Step 5.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary.
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the occupant classifica-
tion-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace the passenger seat cushion frame assembly
(Refer to GROUP 52A, Front Seat Assembly
).
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
).
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-350
DTC B1B79: Passenger Seat Weight Sensor (ground side) Short-circuited (front: LH)
DTC B1B7E: Passenger Seat Weight Sensor (ground side) Short-circuited (front: RH)
DTC B1B83: Passenger Seat Weight Sensor (ground side) Short-circuited (rear: LH)
DTC B1B88: Passenger Seat Weight Sensor (ground side) Short-circuited (rear: RH)
AC803887
OCCUPANT
CLASSIFICATION-
ECU
FRONT SEAT
ASSEMBLY (RH)
WEIGHT SENSOR
(FRONT: LH)
WEIGHT SENSOR
(FRONT: RH)
WEIGHT SENSOR
(REAR: LH)
WEIGHT SENSOR
(REAR: RH)
AB
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