Mitsubishi Galant 9G. Manual — part 1479
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-326
NOTE: After inspecting intermediate connectors C-22, C-211
and C-215 inspect the wiring harness. If intermediate connec-
tors C-22, C-211 and C-215 are damaged, repair or replace
them. Refer to GROUP 00E, Harness Connector Inspection .
Then go to Step 8.
Q: Are the harness wires between occcupant
classification-ECU connector D-30 (terminal No.2) and
ignition switch connector C-308 (terminal No.2) in good
condition?
YES : Then go to Step 6.
NO : Replace the harness wires between occupant
classification-ECU connector D-30 and ignition switch
connector C-308. Then go to Step 8.
AC305233 AI
CONNECTOR: C-22
C-22 (Y)
AC305416
CONNECTORS: C-211, C-215
JUNCTION BLOCK
(FRONT VIEW)
C-215
C-211
HARNESS SIDE
C-211
HARNESS SIDE
C-215
AK
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-327
STEP 6. Check the harness wires for open circuit or short
circuit between SRS-ECU connector C-120 (terminal No.66)
and occupant classification-ECU connector D-30 (terminal
No.3).
Q: Are the harness wires between SRS-ECU connector
C-120 (terminal No.66) and occupant classification-ECU
connector D-30 (terminal No.3) in good condition?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1545 or B1546
sets, replace the front seat slide adjuster (Refer to
GROUP 52A, Front seat assembly
go to Step 7.
NO : Replace the harness wires between SRS-ECU
connector C-120 and occupant classification-ECU
connector D-30. Then go to Step 8.
STEP 7. 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 DTC B1545 or B1546 set?
YES : Replace the SRS-ECU (Refer to
). Then go
to Step 8.
NO : The procedure is complete.
AC305362
CONNECTOR: C-120
C-120 (Y)
AG
SRS-ECU
63
55
51
69
61
66
58
65
64
56 57
68
60
67
59
70
62
53
52 B
A
54
C-120
Harness side
connector
(rear view)
AC308166
CONNECTOR : D-30
AC
D-30 (GR)
HARNESS SIDE
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-328
STEP 8. 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 DTC B1545 or B1546 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC B1547: Passenger’s Front Air Bag Cut Off System
CAUTION
If DTC B1547 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
DTC SET CONDITIONS
This DTC is set if the following conditions are
detected:
• Malfunction of occupant classification-ECU sys-
tem
• Malfunction of front passenger’s seat belt switch
system
• Malfunction of front passenger’s air bag module
system
• Malfunction of SRS-ECU system
.
TROUBLESHOOTING HINTS
Malfunction of 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)
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-329
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) 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 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
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