Mitsubishi Evolution X. Manual — part 713
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-299
U0151
SRS-ECU CAN timeout
U0155
Combination meter CAN timeout
U0164
A/C-ECU CAN timeout
U0168
KOS-ECU or WCM CAN timeout
U0184
Audio CAN timeout
U0195
Satellite radio tuner CAN timeout
U0197
Hands free module CAN timeout
U0245
Audio visual navigation unit CAN timeout
U1419
The signal from a weight sensor (front: LH) is unusual
U141A
The signal from a weight sensor (front: RH) is unusual
U141B
The signal from a weight sensor (rear: LH) is unusual
U141C
The signal from a weight sensor (rear: RH) is unusual
U1423
The signal from a weight sensor is unusual
Diagnostic trouble
Code No.
Inspection item
Reference page
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-300
DIAGNOSTIC TROUBLE CODE PROCEDURES <OCCUPANT
CLASSIFICATION-ECU>
DTC B1B78: Passenger Seat Weight Sensor (front: LH) Performance
DTC B1B7D: Passenger Seat Weight Sensor (front: RH) Performance
DTC B1B82: Passenger Seat Weight Sensor (rear: LH) Performance
DTC B1B87: Passenger Seat Weight Sensor (rear: RH) Performance
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-301
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)
AC708954 AK
Connectors: D-39-1, D-39-3, D-39-4,
D-39-5, D-39-6
D-39-1, D-39-3,
D-39-4, D-39-5,
D-39-6
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-302
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-39-1 and weight sensor connector D-39-3, D-39-4, D-39-5
or D-39-6 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Is occupant classification-ECU connector D-39-1,
weight sensor connector D-39-3, D-39-4, D-39-5 or
D-39-6 in good condition?
YES : Go to Step 4.
NO : Repair or replace the component(s) (Refer to GROUP
00E, Harness Connector Inspection
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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