Mitsubishi Galant 9G. Manual — part 1438
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-162
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 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 Use Troubleshooting/Inspection
Service Points
− How to Cope with Intermittent
Malfunctions ).
STEP 3. Check the side-airbag module (LH). (Using scan
tool MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect the side-airbag module (LH) connector D-24.
(3) Connect special tool MB991865 to special tool MB991866.
CAUTION
Do not insert a test probe into the terminal from its front
side directly, as the connector contact pressure may be
weakened.
(4) Insert special tool MB991866 into the D-24 harness side
connector by backprobing.
(5) Connect the negative battery terminal.
(6) Erase diagnostic trouble code memory, and then check the
diagnostic trouble code.
Q: Is DTC B1431 set?
YES : Go to Step 4.
NO : Replace the seatback frame of the front seat (LH)
(Refer to GROUP 52A, Front Seat
go to Step 5.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC307778
CONNECTOR : D-24
AC
D-24 (R)
2
1
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC006042 BP
MB991866
(RESISTOR HARNESS)
D-24 HARNESS SIDE
CONNECTOR
D-24 SIDE-AIRBAG
MODULE (LH) CONNECTOR
MB991865 (DUMMY
RESISTOR: 3
Ω
)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-163
STEP 4. Check the harness for open circuit between the
SRS-ECU connector C-122 (terminal No.9 and 10) and the
side-airbag module (LH) connector D-24 (terminal No.1 and
2).
(1) Disconnect SRS-ECU connector C-122.
(2) Disconnect side-airbag module (LH) connector D-24.
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.9) and the
side-airbag module (LH) connector D-24 (terminal No.1)
• SRS-ECU connector C-122 (terminal No.10) and the
side-airbag module (LH) connector D-24 (terminal No.2)
Q: Does continuity exist?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1431 sets,
replace the SRS-ECU (Refer to
). Then go
to Step 5.
NO : Replace the harness wires between SRS-ECU
connector C-122 and side-airbag module (LH)
connector D-24. Then 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
AC307778
CONNECTOR : D-24
AC
D-24 (R)
2
1
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC308176
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
1 2
D-122
HARNESS SIDE
CONNECTOR
(REAR VIEW)
D-24
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AB
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-164
STEP 5.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 B1431 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC B1432: Side-Airbag Module (LH) (Squib) System Fault Power Supply Circuit (Short-Circuited to
Power Supply)
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
Side-Airbag Module (LH) (Squid) Circuit
SIDE AIR BAG MODULE
(SQUIB) (LH)
AIR BAG DRIVE CIRCUIT
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
: CONNECTOR CONNECTED
: ON
CONNECTOR DICONNECTED
: OFF
NOTE
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-165
CAUTION
If DTC B1432 is set in the combination meter,
always diagnose the CAN bus lines.
.
CIRCUIT OPERATION
• The SRS-ECU judges how severe a collision is
by detecting signals from the left and right side
impact sensors. If the impact is over a predeter-
mined level, the SRS-ECU sends an ignition sig-
nal. At this time, if the side-airbag safing
G-sensor is on, the SRS side-airbag will inflate.
• The ignition signal is input to the side-airbag
module to inflate the side-airbag.
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the side-airbag mod-
ule (LH) (squib).
.
TROUBLESHOOTING HINTS
• Damaged wiring harnesses or connectors
• Short to the power supply in the side-airbag mod-
ule (LH) (squib) harness
• 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 (Vehicles with CAN
communication system)
• MB991865: Dummy resistor
• MB991866: Resister harness
AC305362
CONNECTOR: C-122
C-122 (Y)
AE
SRS-ECU
AC307778
CONNECTOR : D-24
AB
D-24 (R)
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