Mitsubishi Galant 9G. Manual — part 1472
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-298
STEP 3. Check the SRS-ECU connector C-120, C-121 and
C-122.
Q: Are connectors correctly engaged?
YES : Go to Step 4.
NO : Engage the connectors correctly. Then go to Step 5.
AC307741
CONNECTORS: C-120, C-121, C-122
C-120 (Y),
C-121 (Y),
C-122 (Y)
AB
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)
C-121 Harness side
connector (rear view)
42
31
38
27
21
41
28
39
22
30
25
47
36
33
44
34
45
37
48
26
29
23
40
32
43
35
46
24
B
A
C-122 Harness side
connector (rear view)
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-299
STEP 4. Check SRS-ECU connector C-120, C-121 and
C-122 for damage.
(1) Disconnect SRS-ECU connectors C-120, C-121 and C-122.
(2) Check the connector lock switch terminal inside the harness
side connector for improper contact or deformation.
Q: Are the SRS-ECU connector C-120, C-121 and C-122 in
good condition?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1519 sets,
replace the SRS-ECU (Refer to
). Then go
to Step 5.
NO : Replace the SRS-ECU connector C-120, C-121 and
C-122. Refer to GROUP 00E, Harness Connector
Inspection . Then go to Step 5.
AC307741
CONNECTORS: C-120, C-121, C-122
C-120 (Y),
C-121 (Y),
C-122 (Y)
AB
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)
C-121 Harness side
connector (rear view)
42
31
38
27
21
41
28
39
22
30
25
47
36
33
44
34
45
37
48
26
29
23
40
32
43
35
46
24
B
A
C-122 Harness side
connector (rear view)
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
AC307924 AB
SRS-ECU HARNESS SIDE
CONNECTOR (FRONT VIEW)
CONNECTOR LOCK
SWITCH TERMINAL
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-300
STEP 5. 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 B1519 set?
YES : Return to Step 1.
NO : The procedure is complete.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-301
DTC B1520: Seat belt switch (LH) malfunction DTC B1521: Seat belt switch (LH) circuit open (for
Normal/Close terminal) DTC B1522: Seat belt switch (LH) circuit (ground side) shorted (for
Normal/Close terminal) DTC B1523: Seat belt switch (LH) circuit (power supply side) shorted (for
Normal/Close terminal) DTC B1524: Seat belt switch (LH) circuit open (for Normal/Open terminal) DTC
B1525: Seat belt switch (LH) circuit (ground side) shorted (for Normal/Open terminal) DTC B1526:
Seat belt switch (LH) circuit (power supply side) shorted (for Normal/Open terminal) DTC B1527: Seat
belt switch (LH) circuit open (for COM terminal) DTC B1528: Seat belt switch (LH) circuit (ground side)
shorted (for COM terminal) DTC B1529: Seat belt switch (LH) circuit (power supply side) shorted (for
COM terminal)
CAUTION
If DTC B1520, B1521, B1522, B1523, B1524,
B1525, B1526, B1527, B1528 or B1529 are set in
the combination meter, always diagnose the CAN
bus lines.
.
CIRCUIT OPERATION
The SRS-ECU determines whether the seat belt is
fastened or not according to the connection location
of the seat belt switch in the seat buckle.
.
Driver's Seat Belt Switch Circuit
SEAT BELT
SWITCH (DRIVER'S SIDE)
DETECTION CIRCUIT
SEAT BELT SWITCH
(DRIVER'S SIDE)
SRS-ECU
AC305362
CONNECTOR: C-122
C-122 (Y)
AE
SRS-ECU
AC305264
AQ
CONNECTOR: D-28
D-28 (B)
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