Mitsubishi Galant (2004+). Manual — part 1578
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-205
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Go to Step 3.
NO : There is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to Cope with Intermittent
Malfunction
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-206
STEP 3. Check the passenger's seat belt pre-tensioner.
(Using scan tool MB991958, read the diagnostic trouble
code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect passenger's seat belt pre-tensioner connector
D-33. Use a flat-tipped screwdriver to unlock the locking
button at the harness side connector by withdrawing it
toward you in two stages, and then disconnect the
connector.
(3) Connect special tool MB991865 to special tool MB991884.
(4) Connect special tool MB991884 to the D-33 harness side
connector.
(5) Connect the negative battery terminal.
(6) Erase diagnostic trouble code memory, and then check the
diagnostic trouble code.
Q: Is DTC B1463 set?
YES : Go to Step 4.
NO : Replace the passenger's seat belt pre-tensioner
(Refer to
AC307915 AC
CONNECTOR: D-33
D-33 (B)
FORWARD
CENTER
PILLAR
HARNESS SIDE
CONNECTOR
(FRONT VIEW)
2 1
AC103556AU
LOCKING BUTTON
FLAT-TIP SCREW
DRIVER
D-33 HARNESS
SIDE CONNECTOR
D-33 PASSENGER'S
SEAT BELT
PRE-TENSIONER
CONNECTOR
MB991884
MB991885
AC103283AP
MB991865
(DUMMY RESISTOR : 3
Ω)
MB991884
(RESISTOR
HARNESS)
D-33 HARNESS SIDE
CONNECTOR
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-207
STEP 4. Check the passenger's seat belt pre-tensioner
circuit. Measure the resistance at the SRS-ECU connector
C-120.
(1) Disconnect SRS-ECU connector C-120.
(2) Disconnect passenger's seat belt pre-tensioner connector
D-33. Use a flat-tipped screwdriver to unlock the locking
button at the harness side connector by withdrawing it
toward you in two stages, and then disconnect the
connector.
CAUTION
Do not insert a test probe into the terminal from its front
side directly, as the connector contact pressure may be
weakened.
(3) Check for continuity between C-120 harness side connector
terminals 59, 60 and body ground.
It should be open circuit.
Q: Does continuity exist?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1463 sets,
replace the SRS-ECU (Refer to
). Then go
to Step 6.
NO : Go to Step 5.
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)
AC307915 AC
CONNECTOR: D-33
D-33 (B)
FORWARD
CENTER
PILLAR
HARNESS SIDE
CONNECTOR
(FRONT VIEW)
2 1
AC103556AU
LOCKING BUTTON
FLAT-TIP SCREW
DRIVER
D-33 HARNESS
SIDE CONNECTOR
D-33 PASSENGER'S
SEAT BELT
PRE-TENSIONER
CONNECTOR
AC301574
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-208
STEP 5. Check harness wires for short circuit to ground
between SRS-ECU connector C-120 (terminal No.59 and
60) and passenger's seat belt pre-tensioner connector
D-33 (terminal No.1 and 2).
Q: Are the harness wires between SRS-ECU connector
C-120 (terminal No.59 and 60) and passenger's seat belt
pre-tensioner connector D-33 (terminal No.1 and 2) in
good condition?
YES : Go to Step 6.
NO : Replace the harness wires between SRS-ECU
connector C-120 and passenger's seat belt
pre-tensioner connector D-33. 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 B1463 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)
AC307915 AC
CONNECTOR: D-33
D-33 (B)
FORWARD
CENTER
PILLAR
HARNESS SIDE
CONNECTOR
(FRONT VIEW)
2 1
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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