Mitsubishi Evolution X. Manual — part 714
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-303
STEP 4. Check the wiring harness between occupant
classification-ECU connector D-39-1 (terminal 1) and
weight sensors D-39-3, D-39-4, D-39-5, and D-39-6 (terminal
2).
Q: Is the wiring harness between occupant
classification-ECU connector D-39-1 (terminal 1) and
weight sensor D-39-3, D-39-4, D-39-5, D-39-6 (terminal 2)
in good condition?
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 slide adjuster (RH) (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-304
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)
WEIGHT SENSOR
(FRONT: LH)
WEIGHT SENSOR
(REAR: LH)
WEIGHT SENSOR
(REAR: RH)
WEIGHT SENSOR
(FRONT: RH)
FRONT SEAT
ASSEMBLY (RH)
OCCUPANT
CLASSIFICATION-
ECU
Weight Sensor
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-305
CAUTION
If DTC B1B79, B1B7E, B1B83 or B1B88 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 wire is short-cir-
cuited to ground.
.
TROUBLESHOOTING HINTS
• Disengaged wire harnesses or connector
• Short to the ground in the weight sensor harness
• Malfunction of the weight sensor
• Malfunction of the occupant classification-ECU
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)
AC708954 AL
Connector: D-39-1
D-39-1
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-306
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
).
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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