Mitsubishi Galant (2004+). Manual — part 1581
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-217
STEP 7. Check the driver’s seat belt pre-tensioner circuit.
Measure the resistance at the SRS-ECU connector C-122.
(1) Disconnect SRS-ECU connector C-122.
DANGER
To prevent the seat belt pre-tensioner from deploying
unintentionally, disconnect the driver’s seat belt
pre-tensioner connector D-21 to short the squib cir-
cuit.
(2) Disconnect driver's seat belt pre-tensioner connector D-21.
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 7, 8 and the short spring to release
the short spring.
AC305362
CONNECTOR: C-122
C-122 (Y)
AI
SRS-ECU
C-122
Harness side
connector
(rear view)
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
AC306920AC
CONNECTOR: D-21
D-21 (B)
FOWARD
CENTER
PILLAR
HARNESS SIDE
CONNECTOR
(FRONT VIEW)
2 1
AC103556 AT
LOCKING BUTTON
FLAT-TIP SCREW
DRIVER
D-21 HARNESS
SIDE CONNECTOR
D-21 DRIVER'S
SEAT BELT
PRE-TENSIONER
CONNECTOR
AC308180 AB
A
A
C-122 HARNESS SIDE
CONNECTOR (FRONT VIEW)
TERMINAL
CABLE TIE
SHORT SPRING
4 mm (0.16 inch) OR MORE
SEC-
TION
A - A
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-218
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-122 harness side connector
terminals 7 and 8.
It should be open circuit.
Q: Does continuity exist?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1470 sets,
replace the SRS-ECU (Refer to
). Then go
to Step 9.
NO : Go to Step 8.
STEP 8. Check the harness for short circuit between
SRS-ECU connector C-122 (terminal No.7 and 8) and
driver’s seat belt pre-tensioner connector D-21 (terminal
No.1 and 2).
Q: Are harness wires between SRS-ECU connector C-122
(terminal No.29 and 30) and driver’s seat belt
pre-tensioner connector D-21 (terminal No.1 and 2) in
good condition?
YES : Go to Step 9.
NO : Replace the harness wires between SRS-ECU
connector C-122 and driver’s seat belt pre-tensioner
connector D-21. Then go to Step 9.
AC308179
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
C-122 CONNECTOR
HARNESS SIDE
(REAR VIEW)
AB
AC305362
CONNECTOR: C-122
C-122 (Y)
AI
SRS-ECU
C-122
Harness side
connector
(rear view)
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
AC306920AC
CONNECTOR: D-21
D-21 (B)
FOWARD
CENTER
PILLAR
HARNESS SIDE
CONNECTOR
(FRONT VIEW)
2 1
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-219
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 B1470 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC B1471: Seat Belt Pre-Tensioner (LH) (Squib) System Fault 2 (Open in the Squib Circuit)
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SEAT BELT
PRETENSIONER
(LH)
AIR BAG DRIVE CIRCUIT
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
Driver's Seat Belt Pre-Tensioner (Squib) Circuit
: CONNECTOR CONNECTED: ON
CONNECTOR DISCONNECTED: OFF
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-220
CAUTION
If DTC B1471 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 driver's seat belt
pre-tensioner (squib).
.
TROUBLESHOOTING HITS
• Improper connector contact
• Open circuit in the driver's seat belt pre-tensioner
(squib) circuit
• 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-122
C-122 (Y)
AE
SRS-ECU
AC306920AB
CONNECTOR: D-21
D-21 (B)
FOWARD
CENTER
PILLAR
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