Mitsubishi Galant (2004+). Manual — part 1593
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-265
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 : Check the pasenger’s air bag OFF indicator light drive
circuit system (Refer to
).
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
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-266
DTC B1489: Passenger’s Air Bag OFF Indicator Light Drive Circuit System Fault 1 (Light does not
Illuminate).
SRS-ECU
IGNITION
SWITCH (IG1)
JUNCTION
BLOCK
AIR BAG OFF
INDICATOR
LIGHT
(PASSEGER'S SIDE)
RELAY
BOX
JOINT
CONNECTOR (1)
TAILLIGHT
RELAY
FRONT ECU
AIR BAG OFF
INDICATOR LIGHT
DRIVE CIRCUIT
JUNCTION
BLOCK
Air Bag OFF Indicator Light Drive Circuit
AC305233CW
CONNECTOR: C-06
AC305233 AO
CONNECTOR: C-22
C-22 (Y)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-267
CAUTION
If DTC B1489 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
CIRCUIT OPERATION
• Power for the passenger’s air bag OFF indicator
light is supplied from the ignition switch (IG1).
• The passenger’s air bag OFF indicator light illu-
minates when the ignition switch is turned to the
"ON" position and goes out after approximately
seven seconds if there is not a malfunction in the
SRS system.
• If a failure occurs in the system, the SRS-ECU
will stop sending that SRS warning light "OFF"
signal, thus causing the combination meter to illu-
minate the SRS warning light.
• The SRS warning light "OFF" signal is not sent to
the combination meter in the cases below, either.
Therefore, the combination meter will illuminate
the SRS warning light.
• The SRS-ECU connector is disconnected.
• The SRS-ECU is not working normally due to
a failure in its power supply lines.
• The wiring harness between the passenger’s
air bag OFF indicator light and the SRS-ECU
is broken.
.
DTC SET CONDITIONS
This DTC will be set if the passenger’s air bag OFF
indicator light driving circuit is short to ground. If the
vehicle condition returns to normal, DTC B1489 will
be automatically erased, and the warning light will
go out.
.
TROUBLESHOOTING HINTS
• Damaged wiring harnesses or connectors
• Malfunction of the SRS-ECU
• Malfunction of the passenger’s air bag OFF indi-
cator light
.
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)
AC305362
CONNECTOR: C-121
C-121 (Y)
AD
SRS-ECU
AC305415
CONNECTORS : C-211, C-215
C-211
C-215
AZ
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-268
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
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