Mitsubishi Galant (2004+). Manual — part 1549
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-89
CAUTION
Insert an insulator such as a cable tie to a depth of 4mm
(0.16 inch) or more, otherwise the short spring will not be
released.
(4) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch)
thick] between terminals 27 and 28 <1st squib> or 30 and
31 <2nd squib>, and the short spring to release the short
springr.
CAUTION
Do not insert a test probe into the terminal from its front
side directly as the connector contact pressure may be
weakened.
(5) Check for continuity between C-121 harness side connector
terminals 27 and 28 <1st squib> or 30 and 31 <2nd squib>.
It should be open circuit.
Q: Does continuity exist?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1410 <1st
squib> or B1490 <2nd squib> set, replace the
SRS-ECU. (Refer to
). Then go to Step 9.
NO : Go to Step 8.
AC308142
SECTION
A - A
C-121 HARNESS SIDE
CONNECTOR
(FRONT VIEW)
CABLE TIE
SHORT SPRING
4 mm OR MORE
TERMINAL
AB
<1ST SQUIB>
A
A
AC308143
SECTION
A - A
C-121 HARNESS SIDE
CONNECTOR
(FRONT VIEW)
CABLE TIE
SHORT SPRING
4 mm OR MORE
TERMINAL
AB
<2ND SQUIB>
A
A
AC301582
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-121 HARNESS SIDE
CONNECTOR (REAR VIEW)
<1ST SQUIB>
AC
AC308150
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-121 HARNESS SIDE
CONNECTOR (REAR VIEW)
<2ND SQUIB>
AB
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-90
STEP 8. Check the harness for short circuit between
SRS-ECU connector C-121 (terminal No.27 and 28 <1st
squib> or terminal No.30 and 31 <2nd squib>) and
passenger's air bag module connector C-110 (terminal
No.1 and 2 <1st squib> terminal No.4 and 3 <2nd squib>).
NOTE: After inspecting intermediate connector C-22 inspect
the wiring harness. If the intermediate connector C-22 is dam-
aged, repair or replace it.
Q: Are harness wires between SRS-ECU connector C-121
(terminal No.27 and 28 <1st squib> or terminal No.30
and 31 <2nd squib>) and passenger's air bag module
connector C-110 (terminal No.1 and 2 <1st squib>
terminal No.4 and 3 <2nd squib>) in good condition?
YES : Go to Step 9.
NO : Replace the harness wires between SRS-ECU
connector C-121 and passenger’s air bag module
connector C-110. Then go to Step 9.
AC307137AC
C-110 (Y)
FRONT DECK
CROSSMEMBER
CONNECTOR: C-110
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC305362
CONNECTOR: C-121
C-121 (Y)
AH
SRS-ECU
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
AC305233
C-22 (Y)
CO
CONNECTOR: C-22
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-91
STEP 9. Check 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 B1410 <1st squib> or B1490 <2nd squib> 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-92
DTC B1411: Passenger’s (Front) Air Bag Module (1st Squib) System Fault 2 (Open in the Squib
Circuit)
DTC B1491: Passenger’s (Front) Air Bag Module (2nd Squib) System Fault 2 (Open in the Squib
Circuit)
AIR BAG MODULE
(SQUIB)
(PASSENGER'S SIDE)
AIR BAG DRIVE CIRCUIT
SRS-ECU
CONNECTOR
LOCK SWITCH
Passenger's (Front) Air Bag Module (1st Squib and 2nd Squib) Circuit
NOTE
: CONNECTOR CONNECTED
: ON
CONNECTOR DISCONNECTED
: OFF
AC305233 AO
CONNECTOR: C-22
C-22 (Y)
AC307137AD
C-110 (Y)
FRONT DECK
CROSSMEMBER
CONNECTOR: C-110
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