Mitsubishi Galant (2004+). Manual — part 1582
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-221
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
scan tool
."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
STEP 2. 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 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
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-222
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 then check the
diagnostic trouble code.
Q: Is DTC B1471 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-223
STEP 4. Check the harness for open circuit between
SRS-ECU connector C-122 (terminal No.7 and 8) and the
driver's seat belt pre-tensioner D-21 (terminal No.1 and 2).
(1) Disconnect SRS-ECU connector C-122 and driver's seat
belt pre-tensioner connector D-21, and measure at the
wiring harness side. For 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.
(2) Connect D-21 harness side connector to special tool
MB991884.
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
AC201287AT
D-21
HARNESS SIDE
CONNECTOR
MB991884
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-224
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 the following terminals. It
should be less than 2 ohms.
• SRS-ECU connector C-122 (terminal No.7) and the spe-
cial tool (terminal No.2)
• SRS-ECU connector C-122 (terminal No.8) and the spe-
cial tool (terminal No.1)
Q: Does continuity exist?
YES : Erase the diagnostic trouble code memory, and
recheck if any DTC set. If DTC B1471 set, replace the
SRS-ECU (Refer to
NO : Replace harness wires between SRS-ECU connector
C-122 and driver’s seat belt pre-tensioner connector
D-21. Then go to Step 5.
STEP 5. Check 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 B1471 set?
YES : Return to Step 1.
NO : The procedure is complete.
AC308183
2
1
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
AB
<D-21 HARNESS SIDE
CONNECTOR>
SPECIAL TOOL
MB991884
(FRONT VIEW)
C-122 HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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