Mitsubishi Galant 9G. Manual — part 1456
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-234
STEP 4. Check the driver's seat belt pre-tensioner circuit.
Measure the resistance at the SRS-ECU connector C-122.
(1) Disconnect SRS-ECU connector C-122.
(2) Disconnect driver's seat belt pre-tensioner connector D-21.
Use a flat-tipped screwdriver to unlock the locking button at
the harness side connector by withdrawing it toward you in
two stages, and then disconnect the connector.
CAUTION
Do not insert a test probe into the terminal from its front
side directly, as the connector contact pressure may be
weakened.
(3) Check for continuity between C-122 harness side connector
terminals 7, 8 and body ground.
It should be open circuit.
Q: Does continuity exist?
YES : Go to Step 5.
NO : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1473 sets,
replace the SRS-ECU (Refer to
). Then go
to Step 6.
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
AC306920AC
CONNECTOR: D-21
D-21 (B)
FOWARD
CENTER
PILLAR
HARNESS SIDE
CONNECTOR
(FRONT VIEW)
2 1
AC103556 AT
LOCKING BUTTON
FLAT-TIP SCREW
DRIVER
D-21 HARNESS
SIDE CONNECTOR
D-21 DRIVER'S
SEAT BELT
PRE-TENSIONER
CONNECTOR
AC308181
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
AB
C-122 HARNESS SIDE
CONNECTOR
(REAR VIEW)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-235
STEP 5. Check harness wires for short circuit to ground
between SRS-ECU connector C-122 (terminal No.7 and 8)
and driver's seat belt pre-tensioner connector D-21
(terminal No.1 and 2).
Q: Are the harness wires between SRS-ECU connector
C-122 (terminal No.7 and 8) and driver's seat belt
pre-tensioner connector D-21 (terminal No.1 and 2) in
good condition?
YES : Go to Step 6.
NO : Replace the harness wires between SRS-ECU
connector C-122 and driver's seat belt pre-tensioner
connector D-26. Then go to Step 6.
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 B1473 set?
YES : Return to Step 1.
NO : The procedure is complete.
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
AC306920AC
CONNECTOR: D-21
D-21 (B)
FOWARD
CENTER
PILLAR
HARNESS SIDE
CONNECTOR
(FRONT VIEW)
2 1
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-236
DTC B1476: IG1 Power Supply Circuit System (Fuse No.22 Circuit) DTC B1477: IG1 Power Supply
Circuit System (Fuse No.23 Circuit)
IG1 Power Supply Circuit
IGNITION
SWITCH (IG1)
JUNCTION
BLOCK
SRS-ECU
AC305233 AO
CONNECTOR: C-22
C-22 (Y)
AC305362
CONNECTOR: C-121
C-121 (Y)
AD
SRS-ECU
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-237
CAUTION
If DTC B1476 <Fuse No.22> or B1477 <Fuse
No.23> is set in the combination meter, always
diagnose the CAN bus lines.
.
CIRCUIT OPERATION
• The SRS-ECU is powered from the ignition
switch (IG1).
• The SRS-ECU power is supplied from two cir-
cuits. Even if one circuit is shut off, the air bag
can inflate.
.
DTC SET CONDITIONS
This DTC is set if the voltage between the IG1 termi-
nals (fuse No.22 circuit or fuse No.23 circuit) and
ground is lower than a predetermined value for a
continuous period of five second or more. However, if
the vehicle condition returns to normal, DTC number
B1476 <Fuse No.22> or B1477 <Fuse No.23> will be
automatically erased, and the SRS warning light will
switch off.
.
TROUBLESHOOTING HINTS
• Damaged wiring harnesses or connectors
• 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)
• MB991223 (MB991222): Harness set (Probe)
AC305415
C-211
C-214
CONNECTORS: C-211, C-214
AR
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст