Mitsubishi Galant 9G. Manual — part 1461
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-254
STEP 8. Check the harness for short circuit between
passenger’s seat belt warning light C-07 (terminal No.3)
and SRS-ECU connector C-121 (terminal No.42).
NOTE: After inspecting intermediate connector C-22 inspect
the wiring harness. If intermediate connector C-22 is damaged,
repair or replace them. Refer to GROUP 00E, Harness Con-
nector Inspection . Then go to Step 10.
Q: Are the harness wires between SRS-ECU connector
C-121 (terminal No.42) and the passenger’s seat belt
warning light C-07 (terminal No.3) in good condition?
YES : Go to Step 9.
NO : Repair the harness wires. Then go to Step 10.
AC305233CZ
CONNECTOR: C-07
HARNESS SIDE
AC305362
CONNECTOR: C-121
C-121 (Y)
AH
SRS-ECU
C-121
HARNESS SIDE
CONNECTOR
(REAR VIEW)
42
31
38
27
21
41
28
39
22
30
25
47
36
33
44
34
45
37
48
26
29
23
40
32
43
35
46
24
B
A
AC305233 AI
CONNECTOR: C-22
C-22 (Y)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-255
STEP 9. Check the passenger’s seat belt warning light.
(1) Disconnect the negative battery terminal.
(2) Disconnected the SRS-ECU connector C-121, and
measure at the wiring harness side.
(3) Connect the negative battery terminal.
(4) 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.
(5) Connect terminal No.42 to ground.
Q: Does the warning light illuminate?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1487 set,
replace the SRS-ECU (Refer to
). Then go
to Step 10.
NO : Replace the passenger’s seat belt warning light
(Refer to GROUP 52A, Instrument Panel Assembly
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 B1487 set?
YES : Return to Step 1.
NO : The procedure is complete.
AC305362
CONNECTOR: C-121
C-121 (Y)
AH
SRS-ECU
C-121
HARNESS SIDE
CONNECTOR
(REAR VIEW)
42
31
38
27
21
41
28
39
22
30
25
47
36
33
44
34
45
37
48
26
29
23
40
32
43
35
46
24
B
A
AC308203
42
31
38
27
21
41
28
39
22
30
25
47
36
33
44
34
45
37
48
26
29
23
40
32
43
35
46
24
B
A
C-121 HARNESS SIDE
CONNECTOR (REAR VIEW)
AB
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-256
DTC B1487: Passenger’s seat belt warning Light Drive Circuit System Fault 1 (Light does not Switch
Off).
Seat Belt Warning Light Drive Circuit
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
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-257
CAUTION
If DTC B1487 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.
• 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
seat belt warning light and the SRS-ECU is
broken.
.
DTC SET CONDITIONS
This DTC will be set if an open circuit has occurred in
the wiring harness between the passenger’s seat
belt warning light and the SRS-ECU. If the vehicle
condition returns to normal, DTC B1487 will be auto-
matically erased, and the passenger’s seat belt
warning light will go out.
.
TROUBLESHOOTING HINTS
• Damaged wiring harnesses or connectors
• Malfunction of the SRS-ECU
• Malfunction of the passenger’s seat belt warning
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)
AC305233CY
CONNECTOR: C-07
AC305233 AO
CONNECTOR: C-22
C-22 (Y)
AC305362
CONNECTOR: C-121
C-121 (Y)
AD
SRS-ECU
AC305415
CONNECTORS : C-211, C-215
C-211
C-215
AZ
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