Mitsubishi Galant (2004+). Manual — part 1584
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-229
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-230
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
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-231
DTC B1473: Seat Belt Pre-Tensioner (LH) (Squib) System Fault for Ground Circuit (Short-Circuited to
Ground)
CAUTION
If DTC B1473 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
• Damaged wiring harnesses or connectors
• Short to the ground in the driver's seat belt
pre-tensioner (squib) harness
• Malfunction of the SRS-ECU
.
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
AC305362
CONNECTOR: C-122
C-122 (Y)
AE
SRS-ECU
AC306920AB
CONNECTOR: D-21
D-21 (B)
FOWARD
CENTER
PILLAR
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-232
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)
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,
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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