Mitsubishi Galant (2004+). Manual — part 1574
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-189
STEP 7. 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.
DANGER
To prevent the seat belt pre-tensioner from deploying
unintentionally, disconnect the passenger’s seat belt
pre-tensioner connector D-33 to short the squib cir-
cuit.
(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
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 59, 60 and the short spring to
release the short spring.
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
AC301608
SEC-
TION
A - A
C-120 HARNESS SIDE
CONNECTOR (FRONT VIEW)
CABLE TIE
SHORT SPRING
4 mm OR MORE
TERMINAL
A
AE
A
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-190
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-120 harness side connector
terminals 59 and 60.
It should be open circuit.
Q: Does continuity exist?
YES : Erase the diagnostic trouble code memory, and check
diagnostic trouble code. If DTC B1460 set, replace
the SRS-ECU (Refer to
). Then go to Step
NO : Go to Step 8.
STEP 8. Check the harness for short circuit 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 harness wires between SRS-ECU connector C-120
(terminal No.59 and 60) connector and passenger’s seat
belt pre-tensioner connector (terminal No.1 and 2) in
good condition?
YES : Go to Step 9.
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 9.
AC301572
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)
AE
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
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-191
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 B1460 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC B1461: Seat Belt Pre-Tensioner (RH) (Squib) System Fault 2 (Open in the Squib Circuit)
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SEAT BELT
PRETENSIONER
(RH)
AIR BAG DRIVE CIRCUIT
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
: CONNECTOR CONNECTED: ON
CONNECTOR DISCONNECTED: OFF
Passenger's (Front) Seat Belt Pre-Tensioner (Squib) Circuit
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-192
CAUTION
If DTC B1461 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
CIRCUIT OPERATION
The SRS-ECU judges how severe a collision is by
detecting signals from the front impact sensors and
the front air bag analog G-sensor. If the impact is
over a predetermined level, the SRS-ECU sends an
ignition signal. At this time, if the front air bag safing
G-sensor is on, the pre-tensioner will deploy.
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the passenger's seat
belt pre-tensioner (squib).
.
TROUBLESHOOTING HITS
• Open circuit in the passenger's seat belt
pre-tensioner (squib) circuit
• Improper connector contact
• Malfunction of the SRS-ECU
.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
• MB991865: Dummy resistor
• MB991884: Resister harness (For Pre-tensioner)
AC305362
CONNECTOR: C-120
C-120 (Y)
AC
SRS-ECU
AC307915 AB
CONNECTOR: D-33
D-33 (B)
FORWARD
CENTER
PILLAR
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