Mitsubishi Galant 9G. Manual — part 1483
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SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-342
INSPECTION PROCEDURE 3: When the Ignition Key is Turned to "ON" (Engine Stopped), the SRS
Warning Light does not Illuminate. INSPECTION PROCEDURE 4: The SRS Warning Light Remains
Illuminated after the Engine is Started.
.
AC401937
CPU
COMBINATION
METER
JOINT
CONNECTOR (3)
DATA LINK
CONNECTOR
SRS-ECU
BATTERY
IGNITION SWITCH (IG1)
AB
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SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-343
TECHNICAL DESCRIPTION (COMMENT)
• The SRS-ECU sends the SRS warning light sig-
nal to the combination meter via the CAN com-
munication.
• This may be caused by faults in the CAN bus line,
the combination meter or the SRS-ECU.
.
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CASE:)
• Damaged wiring harness or connector
• Combination meter defect
• Malfunction of the SRS-ECU
.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
.
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.
Use scan tool MB991958 to diagnose the CAN bus lines.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
Q: Is the check result satisfactory?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP 54C,
Diagnosis-Can Bus Diagnostic Chart ). Repair the
CAN bus lines, and then go to Step 2.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-344
STEP 2. Using scan tool MB991958, read the combination
meter diagnostic trouble code.
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.
Use scan tool MB991958 to check whether combination meter
DTC U1112 has been set.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check whether combination meter DTC U1112 has been
set.
Q: Is combination meter DTC U1112 set?
YES : Replace the SRS-ECU.
NO : Replace the combination meter.
DATA LIST REFERENCE TABLE
M1524003500038
The following items can be read by the scan tool
from the SRS-ECU input data.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
No.
DATA LIST ITEM
CHECK
CONDITIONS
NORMAL CONDITIONS
01
Failure continuation time 1
*
Always
Maximum time to be stored: 9999
minutes (approximately seven
days)
02
Failure continuation time 2
*
Always
03
Seat position
Slide the seat from
the back-end position
to the front-end
position.
Rear/Front
04
Passenger seat Airbag Ignition
Do not apply any load
to the passenger
seat.
Permission/Prohibition
06
Driving seatbelt (Buckle SW1)
Wear the driver
seatbelt.
Unfastened/Fastened
07
Driving seatbelt (Buckle SW2)
Undo the driver
seatbelt.
Fastened/Unfastened
08
Passenger seatbelt (Buckle
SW1)
Wear the passenger
seatbelt.
Unfastened/Fastened
09
Passenger seatbelt (Buckle
SW2)
Undo the passenger
seatbelt.
Fastened/Unfastened
10
Elimination times
Always
Maximum time to be stored: 255
days
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SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-345
NOTE:
.
•
1
*
: indicates the duration from the occurrence of failure to the first ignition signal output.
•
2
*
: indicates the duration from the first collision judgment or non-ignition judgment to the present.
ACTUATOR TEST REFERENCE TABLE
M1524003600035
The scan tool activates the following actuators for
testing.
FAIL-SAFE FUNCTION
M1524003700021
If the SRS-ECU determines that the following parts
are defective, the SRS-ECU operates the SRS warn-
ing light and controls as follows.
• If the seat belt switch is defective, the SRS-ECU
determines that the seat belt is fastened and con-
trols the seat belt with pre-tensioner.
• If the seat slide sensor is defective, the SRS-ECU
determines that the seat is in its backward posi-
tion and controls the air bag.
• If the occupant classification sensor or the occu-
pant classification-ECU is defective, the
SRS-ECU determines that the occupant classifi-
cation is class 2 (The occupant classification sen-
sor detects 30 kg or more.) and controls the air
bag and the passenger’s air bag OFF indicator
light.
ACCURACY TESTING OF OCCUPANT CLASSIFICATION SENSOR
M1524025800015
The scan tool can be used to perform the next func-
tion.
• Seat Weight Sensor Accuacy Check
• Zero-calibration
42
OCSS Occupant Classification
Apply a load to the
passenger seat.
Class 0/Class 1/Class 2/Not Clear/
−
44
OCSS Occupant Weight
kg/Unkown
45
OCSS Parts Number
Always
−
No.
DATA LIST ITEM
CHECK
CONDITIONS
NORMAL CONDITIONS
MUT-III SCAN TOOL
DISPLAY
ITEM NO.
ITEM
PARTS TO BE ACTIVATED
SRS Warning Lamp
01
The SRS warning light illuminates.
CAN output
Passenger Seat belt
Warning Lamp
02
Passenger’s seat belt warning light
illumination
SRS-ECU output
Passenger SRS OFF
Lamp
03
Passenger’s air bag OFF indicator
light illumination
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