Mitsubishi Galant (2004+). Manual — part 1588
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-245
STEP 10. 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 B1476 or DTC B1477 set?
YES : Return to Step 1.
NO : The procedure is complete.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-246
DTC B1486: Passenger’s seat belt warning Light Drive Circuit System Fault 2.
CAUTION
If DTC B1486 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
CIRCUIT OPERATION
• Power for the passenger’s seat belt warning light
is supplied from the ignition switch (IG1).
• The passenger’s seat belt warning light illumi-
nates 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.
.
SRS-ECU
IGNITION
SWITCH (IG1)
JUNCTION
BLOCK
SEAT BELT
WARNING
LIGHT
(PASSEGER'S SIDE)
RELAY
BOX
JOINT
CONNECTOR (1)
TAILLIGHT
RELAY
FRONT ECU
JUNCTION
BLOCK
SEAT BELT
WARNING LIGHT
DRIVE CIRCUIT
Seat Belt Warning Light Drive Circuit
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-247
DTC SET CONDITIONS
• This DTC is set under one of the following cases
while the SRS-ECU is monitoring the passen-
ger’s seat belt warning light drive circuit:
• When a short circuit occurs in the passen-
ger’s seat belt warning light drive circuit.
• When a malfunction is detected in the output
transistor inside the SRS-ECU.
However, if the vehicle condition returns to normal,
DTC B1486 will be automatically erased, and the
passenger’s seat belt warning light will go out.
.
TROUBLESHOOTING HINTS
• Damaged wiring harnesses or connectors
• Malfunction of the SRS-ECU
.
DIAGNOSIS
Required Special Tool:
• 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)
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
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-248
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 passenger’s seat belt warning 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
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