Mitsubishi Galant (2004+). Manual — part 1538
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-45
STEP 8. Check the driver’s air bag module circuit. Measure
the resistance at SRS-ECU connector C-121.
(1) Disconnect SRS-ECU connector C-121.
DANGER
To prevent the air bag from deploying unintentionally,
disconnect clock spring connector C-307 to short the
squib circuit.
(2) Disconnect clock spring connector C-307.
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.
(3) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch)
thick] between terminals 36, 37 <1st squib> or 33, 34 <2nd
squib> and the short spring to release the short spring.
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
AC305235AK
C-307 (Y)
CONNECTOR: C-307
C-307 HARNESS
SIDE CONNECTOR
CLOCK
SPRING
11
12
13
14
AC308144
SECTION
A - A
C-121 HARNESS SIDE
CONNECTOR
(FRONT VIEW)
CABLE TIE
SHORT SPRING
4 mm OR MORE
TERMINAL
A
AB
A
<1ST SQUIB>
AC308141
SECTION
A - A
C-121 HARNESS SIDE
CONNECTOR
(FRONT VIEW)
CABLE TIE
SHORT SPRING
4 mm OR MORE
TERMINAL
AB
<2ND SQUIB>
A
A
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-46
CAUTION
Do not insert a test probe into the terminal from its front
side directly as the connector contact pressure may be
weakened.
(4) Check for continuity between C-26 harness side connector
terminals 36 and 37 <1st squib> or 33 and 34 <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 B1400 <1st
squib> or B1481 <2nd squib> set, replace the
SRS-ECU. (Refer to
). Then go to Step 10.
NO : Go to Step 9.
STEP 9. Check the harness for short circuit between
SRS-ECU connector C-121 (terminal No.36 and 37 <1st
squib> or No.33 and 34 <2nd squib>) and clock spring
connector C-307 (terminal No.13 and 14 <1st squib> or
No.11 and 12 <2nd squib>).
AC301581
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
AC308145
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
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
AC305235AK
C-307 (Y)
CONNECTOR: C-307
C-307 HARNESS
SIDE CONNECTOR
CLOCK
SPRING
11
12
13
14
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-47
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.36 and 37 <1st squib> or No.33 and 34
<2nd squib>) and clock spring connector C-307
(terminal No.13 and 14 <1st squib> or No.11 and 12 <2nd
squib>) in good condition?
YES : Go to Step 10.
NO : Replace the harness wires between SRS-ECU
connector C-121 and clock spring connector C-307.
Then go to Step 10.
STEP 10. 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 B1400 <1st squib> or B1480 <2nd squib> set?
YES : Return to Step 1.
NO : The procedure is complete.
AC305233
C-22 (Y)
CO
CONNECTOR: C-22
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-48
DTC B1401: Driver's Air Bag Module (1st Squib) System Fault 2 (Open in the Squib Circuit)
DTC B1481: Driver's Air Bag Module (2nd Squib) System Fault 2 (Open in the Squib Circuit)
AIR BAG MODULE
(SQUIB)
(DRIVER'S SIDE)
CLOCK
SPRING
AIR BAG DRIVE CIRCUIT
SRS-ECU
: CONNECTOR LOCK SWITCH
CONNECTOR CONNECTED: ON
CONNECTOR DISCONNECTED: OFF
CONNECTOR
LOCK SWITCH
Driver's Air Bag Module (1st and 2nd Squib) Circuit
AC305233 AO
CONNECTOR: C-22
C-22 (Y)
AC305362
CONNECTOR: C-121
C-121 (Y)
AD
SRS-ECU
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