Mitsubishi Galant (2004+). Manual — part 1558
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-125
STEP 5. Check SRS-ECU connector C-120 and side-airbag
module (RH) connector D-32. (Using scan tool MB991958,
read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect connectors C-120 and D-32, and then
reconnect them.
(3) Connect the negative battery terminal.
(4) Erase the diagnostic trouble code memory, and check the
diagnostic trouble code.
Q: Is DTC B1420 out put?
YES : Go to Step 6.
NO : The procedure is complete. It is assumed that DTC
B1420 set because connector C-120 or D-32 was
engaged improperly.
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)
AC307779
D-32 (R)
AD
2
1
HARNESS SIDE
CONNECTOR
(REAR VIEW)
CONNECTOR : D-32
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-126
STEP 6. Check the side-airbag module (RH). (Using scan
tool MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect the side-airbag module (RH) connector D-32.
(3) Connect special tool MB991865 to special tool MB991866.
CAUTION
Do not insert a test probe into the terminal from its front
side directly, as the connector contact pressure may be
weakened.
(4) Insert special tool MB991866 into the D-32 harness side
connector by backprobing.
(5) Connect the negative battery terminal.
(6) Erase the diagnostic trouble code memory, and check the
diagnostic trouble code.
Q: Is DTC B1420 set?
YES : Go to Step 7.
NO : Replace the seatback frame of the front seat (RH).
(Refer to GROUP 52A, Front Seat
go to Step 9.
AC307779
D-32 (R)
AD
2
1
HARNESS SIDE
CONNECTOR
(REAR VIEW)
CONNECTOR : D-32
AC006042BO
MB991866
(RESISTOR HARNESS)
D-32 HARNESS SIDE
CONNECTOR
D-32 SIDE-AIRBAG
MODULE (RH) CONNECTOR
MB991865 (DUMMY
RESISTOR: 3
Ω)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-127
STEP 7. Check the side-airbag module (RH) circuit.
Measure the resistance at the SRS-ECU connector C-120.
(1) Disconnect SRS-ECU connector C-120.
DANGER
To prevent the air bag from deploying unintentionally,
disconnect the side-airbag module (RH) connector
D-32 to short the squib circuit.
(2) Disconnect side-airbag module connector D-32.
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 57, 58 and the short spring to
release the short spring.
(4) Measure at the wiring harness side.
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-120 harness side connector
terminals 57 and 58.
It should be open circuit.
Q: Does continuity exist?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1420 sets,
replace the SRS-ECU. (Refer to
). Then go
to Step 7.
NO : Go to Step 8.
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)
AC307779
D-32 (R)
AD
2
1
HARNESS SIDE
CONNECTOR
(REAR VIEW)
CONNECTOR : D-32
AC301607AC
C-120 HARNESS SIDE
CONNECTOR (FRONT VIEW)
TERMINAL
CABLE
TIE
SECT-
ION
A - A
4 mm (0.16 inch) OR MORE
SHORT SPRING
A
A
AC301573
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)
AD
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-128
STEP 8. Check the harness wires for short circuit between
SRS-ECU connector C-120 (terminal No.57 and 58) and
side-airbag module (RH) connector D-32 (terminal No.1
and 2).
Q: Are the harness wires between SRS-ECU connector
C-120 (terminal No.57 and 58) and side-airbag module
(RH) connector D-32 (terminal No.1 and 2) in good
condition?
YES : Go to Step 9.
NO : Repair the harness wires between SRS-ECU
connector C-120 and side-airbag module (RH)
connector D-32. Then go to Step 9.
STEP 9. 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 B1420 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)
AC307779
D-32 (R)
AD
2
1
HARNESS SIDE
CONNECTOR
(REAR VIEW)
CONNECTOR : D-32
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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