Mitsubishi Galant 9G. Manual — part 1477
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-318
STEP 5. Check the harness wires between SRS-ECU
connector C-120 (terminal No.52, 65 and 51) and
passenger’s seat belt switch connector D-29 (terminal
No.1, 2 and 3).
Q: Are harness wires between SRS-ECU connector C-120
(terminal No.52, 65 and 51) and passenger’s seat belt
switch connector D-29 (terminal No.1, 2 and 3) in good
condition?
YES : Go to Step 6.
NO : Replace the harness wires between SRS-ECU
connector C-120 and passenger’s seat belt switch
connector D-29. Then go to Step 6.
STEP 6. 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 B1530, B1531, B1532, B1533, B1534, B1535,
B1536, B1537, B1538 or B1539 set?
YES : Return to Step 1.
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)
AC305264
AT
CONNECTOR: D-29
HARNESS SIDE
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-319
DTC B1540: Occupant classification-ECU malfunction DTC B1541: Occupant classification-ECU
calibration malfunction DTC B1542: Occupant classification sensor (S1) malfunction DTC B1543:
Occupant classification sensor (S2) malfunction DTC B1558: Occupant classification-ECU ID-cord
malfunction
CAUTION
If DTCs are set in the occupant classifica-
tion-ECU, always diagnose the CAN main bus
line.
DTC SET CONDITIONS
• These DTC are set when a fault is detected in the
occupant classification-ECU. The most likely
causes for this code to be set are shown in the
table below:
TROUBLESHOOTING HINTS
• Malfunction of the occupant classification-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)
CODE NO.
PART/CIRCUIT INTEGRAL TO
occupant classification-ECU
SYMPTOM
B1540
Occupant classification-ECU
• Malfunction of occupant classification-ECU
B1541
• Malfunction of calibration function
B1542
Occupant classification-sensor
• Malfunction of occupant classification sensor (S1)
B1543
• Malfunction of occupant classification sensor (S2)
B1558
Occupant classification-ECU
• Malfunction of ID code in occupant classification-ECU
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-320
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 DTCs set?
YES : Replace the front seat slide adjuster (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 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-321
DTC B1545: Occupant classification-ECU for Power Supply Circuit
DTC B1546: Occupant classification-ECU for Communication System
Occupant Classification Sensor Circuit
OCCUPANT
CLASSIFICATION
DETECTION
CIRCUIT
OCCUPANT
CLASSIFICATION
SENSOR (LH)
SRS-ECU
IGNITION
SWITCH (IG1)
JUNCTION
BLOCK
OCCUPANT
CLASSIFICATION-ECU
OCCUPANT
CLASSIFICATION
SENSOR (RH)
AC305233 AO
CONNECTOR: C-22
C-22 (Y)
AC305362
CONNECTOR: C-120
C-120 (Y)
AC
SRS-ECU
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