Mitsubishi Galant 9G. Manual — part 1470
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-290
DTC B1508: Seat Slide Sensor System Fault Power Supply Circuit (Short-Circuited to Power Supply)
CAUTION
If DTC B1508 is set in the combination meter,
always diagnose the CAN bus lines.
.
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 sensor.
.
TROUBLESHOOTING HINTS
• Damaged wiring harnesses or connectors
• Short to the power supply in the seat slide sensor
harness
• 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-291
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
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-292
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 Use Troubleshooting/Inspection
Service Points
− How to Cope with Intermittent
Malfunctions ).
STEP 3. Check the seat slide sensor. (Using scan tool
MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect the seat slide sensor connector D-27.
(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-27 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 B1508 set?
YES : Go to Step 4.
NO : Replace the seat slide sensor (Refer to
Then go to Step 5.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC308165
CONNECTOR : D-27
AC
D-27 (GR)
HARNESS SIDE
AC006042BQ
MB991866
(RESISTOR HARNESS)
D-27 HARNESS SIDE
CONNECTOR
D-27 SEAT SLIDE
SENSOR CONNECTOR
MB991865 (DUMMY
RESISTOR: 3
Ω
)
(REAR VIEW)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-293
STEP 4. Check the seat slide sensor circuit. Measure the
voltage at the SRS-ECU connector C-122.
(1) Disconnect SRS-ECU connector C-122.
(2) Disconnect seat slide sensor connector D-27.
(3) Turn the ignition switch to the "ON" position.
CAUTION
Do not insert a test probe into the terminal from its front
side directly, as the connector contact pressure may be
weakened.
(4) Measure the voltage between C-122 harness side
connector terminals 1, 2 and body ground.
Voltage should measure 0 volt.
Q: Is the measured voltage within the specified range?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1508 sets,
replace the SRS-ECU (Refer to
). Then go
to Step 6.
NO : 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
AC308165
CONNECTOR : D-27
AC
D-27 (GR)
HARNESS SIDE
AC308187
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
C-122 HARNESS SIDE
CONNECTOR
(REAR VIEW)
AB
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