Mitsubishi Galant 9G. Manual — part 1473
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-302
DTC SET CONDITIONS
DTC is set when the resistance between input termi-
nals of the seat belt switch in the SRS-ECU is with-
out the standard value.
Cause of trouble in each DTC is as follows.
.
TROUBLESHOOTING HINTS
• Malfunction of the seat belt switch
• Damaged wiring harnesses or connectors
• Malfunction of the SRS-ECU
DIAGNOSIS
Required Special Tools:
• MB991222: Probe
• 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)
DTC
SYMPTOM
B1520
Malfunction of seat belt switch
B1521
Malfunction of the Normal/Close terminal or short circuit in its harness
B1522
Short to body ground in the Normal/Close terminal harness
B1523
Short to the power supply in the Normal/Close terminal harness
B1524
Malfunction of the Normal/Open terminal or short circuit in its harness
B1525
Short to body ground in the Normal/Open terminal harness
B1526
Short to the power supply in the Normal/Open terminal harness
B1527
Malfunction of the COM terminal or short circuit in its harness
B1528
Short to body ground in the COM terminal harness
B1529
Short to the power supply in the COM terminal harness
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-303
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
scan tool
."
(2) Connect scan tool MB991958 to the data link connector.
(3) Turn the ignition switch to the "ON" position.
(4) Diagnose the CAN bus line.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 3.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis ). Then go to Step 2.
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "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 Use Troubleshooting/Inspection
Service Points
− How to Cope with Intermittent
Malfunctions ).
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-304
STEP 3. Check the driver’s seat belt switch.
AC305264
AS
CONNECTOR: D-28
D-28 (B)
HARNESS SIDE
AC308221AB
D-28 DRIVER'S
SEAT BELT SWITCH
CONNECTOR
BUCKLE
TONGUE
AC308214AB
D-28 DRIVER'S
SEAT BELT SWITCH
CONNECTOR
AC308219AB
D-28 DRIVER'S
SEAT BELT SWITCH
CONNECTOR
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-305
Disconnect driver’s seat belt switch connector D-28. Then
check continuity between the switch terminals.
Q: Is driver’s seat belt switch in good condition?
YES : Go to Step 4.
NO : Replace inner seat belt. (Refer to GROUP 52A, Front
Seat Belt
.)
ITEM
TESTER
CONNECTION
STANDARD
VALUE
SPECIFIED
CONDITION
Fastened seat
belt
3
− 5
820
± 20 Ω
−
3
− Ground
−
No continuity
5
− Ground
−
No continuity
4
− 5
−
Less than 2
ohms
Unfastened
seat belt
4
− 5
820
± 20 Ω
−
4
− Ground
−
No continuity
5
− Ground
−
No continuity
3
− 5
−
Less than 2
ohms
AC308215
D-28 DRIVER'S
SEAT BELT SWITCH
CONNECTOR
AB
AC308218 AB
D-28 DRIVER'S
SEAT BELT SWITCH
CONNECTOR
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