Mitsubishi Galant 9G. Manual — part 1454
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-226
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 DTC B1472 set?
YES : Go to Step 3.
NO : Go to Step 6.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-227
STEP 3. Check the driver's seat belt pre-tensioner. (Using
scan tool MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(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.
(3) Connect special tool MB991865 to special tool MB991884.
(4) Connect special tool MB991884 to the D-21 harness side
connector.
(5) Connect the negative battery terminal.
(6) Erase diagnostic trouble code memory, and check the
diagnostic trouble code.
Q: Is DTC B1472 set?
YES : Go to Step 4.
NO : Replace the driver's seat belt pre-tensioner (Refer to
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
MB991884
MB991885
AC103283AO
MB991865
(DUMMY RESISTOR : 3
Ω
)
MB991884
(RESISTOR
HARNESS)
D-21 HARNESS SIDE
CONNECTOR
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-228
STEP 4. Check the driver's seat belt pre-tensioner circuit.
Measure the voltage at the SRS-ECU connector C-122.
(1) Disconnect SRS-ECU connector C-122.
(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.
(3) Turn the ignition switch to the "ON" position.
CAUTION
Do not insert a test probe into the terminal from its front
side directly, as the connector contact pressure may be
weakened.
(4) Measure the voltage between C-122 harness side
connector terminals 7, 8 and body ground.
Voltage should measure 0 volt.
Q: Is the measured voltage within the specified range?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1472 sets,
replace the SRS-ECU (Refer to
). Then go
to Step 6.
NO : Go to Step 5.
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
AC308182
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
AB
C-122 HARNESS SIDE
CONNECTOR
(REAR VIEW)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-229
STEP 5. Check the harness wires for short circuit to power
supply 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 the harness wires 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) in
good condition?
YES : Go to Step 6.
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 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 B1472 set?
YES : Return to Step 1.
NO : The procedure is complete.
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
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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