Mitsubishi Galant (2004+). Manual — part 1568
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-165
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 AIR BAG
MODULE
(SQUIB) (LH)
AIR BAG DRIVE CIRCUIT
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
Side-Airbag Module (LH) (Squib) Circuit
NOTE
: CONNECTOR
CONNECTED
: ON
CONNECTOR
DISCONNECTED
: OFF
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-166
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)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-167
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 "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result satisfactory?
YES : Go to Step 2
NO : Repair the CAN bus lines (Refer to GROUP 54C,
Diagnosis-Can Bus Diagnostic Chart
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 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-168
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 the diagnostic trouble code memory, and check the
diagnostic trouble code.
Q: Is DTC B1432 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 6.
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)
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