Mitsubishi Galant 9G. Manual — part 1468
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-282
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 B1506 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-283
STEP 4. Check the harness for open circuit between
SRS-ECU connector C-122 (terminal No.1 and 2) and the
seat slide sensor connector D-27 (terminal No.1 and 2).
(1) Disconnect SRS-ECU connector C-122 and seat slide
sensor connector D-27.
CAUTION
Do not insert a test probe into the terminal from its front
side directly, as the connector contact pressure may be
weakened.
(2) Check for continuity between the following terminals. It
should be less than 2 ohms.
• SRS-ECU connector C-122 (terminal No.2) and the seat
slide sensor connector D-27 (terminal No.1)
• SRS-ECU connector C-122 (terminal No.1) and the seat
slide sensor connector D-27 (terminal No.2)
Q: Does continuity exist?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1506 sets,
replace the SRS-ECU (Refer to
). Then go
to Step 5.
NO : Replace the harness wires between SRS-ECU
connector C-122 and seat slide sensor connector
D-27. Then 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
AC308186
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)
D-27 HARNESS SIDE
CONNECTOR (REAR VIEW)
AB
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-284
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 B1506 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC B1507: Seat Slide Sensor System Fault Ground Circuit (Short-Circuited to Ground)
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
Seat Slide Sensor Circuit
SEAT SLIDE
SENSOR
HALL IC
SEAT SLIDE SENSOR
DETECTION CIRCUIT
SRS-ECU
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-285
CAUTION
If DTC B1507 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 ground in the seat slide sensor 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
AC308165
CONNECTOR : D-27
AB
D-27 (GR)
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