Mitsubishi Galant 9G. Manual — part 1467
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-278
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 B1489 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC B1499: SRS-ECU Air Bag Condition Monitor Detects Deployed Air Bag
CAUTION
If DTC B1499 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
DTC SET CONDITIONS
This DTC is set after the air bag has deployed. If this
DTC is set before the air bag has deployed, the
cause is probably a malfunction inside the
SRS-ECU.
.
TROUBLESHOOTING HINTS
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)
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-279
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 B1499 set?
YES : Replace the SRS-ECU (Refer to
).
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 ).
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-280
DTC B1506: Seat Slide Sensor System Fault 1 (Open in the Seat Slide Sensor Circuit)
CAUTION
If DTC B1506 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
CIRCUIT OPERATION
• The seat slide sensor sets the current value Hi or
Low determined by the seat position.
• The SRS-ECU determines the seat position
according to the current value from the seat slide
sensor.
.
DTC SET CONDITIONS
• This DTC is set if there is abnormal resistance
between the input terminals of the seat slide sen-
sor. The most likely causes for this code to be set
are the followings:
• Open circuit in the seat slide sensor or har-
ness
• Malfunction of connector contact
However, if no DTC reset, the SRS warning light will
be switched off (DTC will be retained).
.
TROUBLESHOOTING HINTS
• Open circuit in the seat slide sensor circuit
• Disengaged seat slide sensor connector
• Improper connector contact
• Malfunction of the SRS-ECU
.
Seat Slide Sensor Circuit
SEAT SLIDE
SENSOR
HALL IC
SEAT SLIDE SENSOR
DETECTION CIRCUIT
SRS-ECU
AC305362
CONNECTOR: C-122
C-122 (Y)
AE
SRS-ECU
AC308165
CONNECTOR : D-27
AB
D-27 (GR)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-281
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
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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