Mitsubishi 380. Manual — part 809
SRS AIR BAG DIAGNOSIS
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-160
STEP 3. Check the driver's seat belt pre-tensioner. (Using
diagnostic tool MB991958, read the diagnostic trouble
code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect driver's seat belt pre-tensioner connector D-33.
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.
(3) Connect special tool MB991865 to special tool MB991884.
(4) Connect special tool MB991884 to the D-33 harness side
connector.
(5) Connect the negative battery terminal.
(6) Erase diagnostic trouble code memory, and then check the
diagnostic trouble code.
Q: Is DTC B1461 set?
YES : Go to Step 4.
NO : Replace the passenger's seat belt pre-tensioner
(Refer to
). Then go to Step 5.
AC307915AC
CONNECTOR: D-33
D-33 (B)
FORWARD
CENTER
PILLAR
HARNESS SIDE
CONNECTOR
(FRONT VIEW)
2 1
MB991884
MB991885
AC103283AP
MB991865
(DUMMY RESISTOR : 3Ω)
MB991884
(RESISTOR
HARNESS)
D-33 HARNESS SIDE
CONNECTOR
SRS AIR BAG DIAGNOSIS
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-161
STEP 4. Check the harness for open circuit between
SRS-ECU connector D-26 (terminal No.59 and 60) and the
driver's seat belt pre-tensioner connector D-33 (terminal
No.1 and 2).
(1) Disconnect SRS-ECU connector D-26 and driver's seat belt
pre-tensioner connector D-33. For connector D-33, 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.
(2) Connect D-33 harness side connector to special tool
MB991884.
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 the following terminals. It
should be less than 2 ohms.
• SRS-ECU connector D-26 (terminal No.59) and the spe-
cial tool (terminal No.1)
• SRS-ECU connector D-26 (terminal No.60) and the spe-
cial tool (terminal No.2)
Q: Does continuity exist?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1461 sets,
replace the SRS-ECU (Refer to
). Then go
to Step 5.
NO : Replace the harness wires between SRS-ECU
connector D-26 driver’s seat belt pre-tensioner
AC307915AC
CONNECTOR: D-33
D-33 (B)
FORWARD
CENTER
PILLAR
HARNESS SIDE
CONNECTOR
(FRONT VIEW)
2 1
24DB063A
CONNECTOR: D-26
SRS-ECU
63
55
51
69
61
66
58
65
64
5657
68
60
67
59
70
62
53
52 B A
54
D-26 (Y)
D-26 FLOOR
HARNESS
CONNECTOR
(REAR VIEW)
AC201287AU
D-33
HARNESS SIDE
CONNECTOR
MB991884
24DB081A
2
1
63
55
51
69
61
66
58
65
64
5657
68
60
67
59
70
62
53
52 B A
54
D-26 FLOOR HARNESS
SIDE CONNECTOR
(REAR VIEW)
<D-33 HARNESS SIDE
CONNECTOR>
SPECIAL TOOL
MB991884
(FRONT VIEW)
SRS AIR BAG DIAGNOSIS
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-162
connector D-33. Then go to Step 5.
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 B1461 set?
YES : Return to Step 1.
NO : The procedure is complete.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-163
DTC B1462: Seat Belt Pre-Tensioner (RH) (Squib) System Fault for Power Supply Circuit
(Short-Circuited to Power Supply)
CAUTION
If DTC B1462 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
CIRCUIT OPERATION
The SRS-ECU judges how severe a collision is by
detecting signals from the front impact sensors and
the front air bag analog G-sensor. If the impact is
over a predetermined level, the SRS-ECU sends an
ignition signal. At this time, if the front air bag safing
G-sensor is on, the pre-tensioner will deploy.
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the driver's seat belt
pre-tensioner (squib).
.
TROUBLESHOOTING HITS
• Damaged wiring harnesses or connectors
• Short to the power supply in the driver's seat belt
pre-tensioner (squib) harness
• Malfunction of the SRS-ECU
• Refer to circuit diagrams GROUP-
• Refer to configuration diagrams GROUP-
.
24DB063A
CONNECTOR: D-26
SRS-ECU
63
55
51
69
61
66
58
65
64
5657
68
60
67
59
70
62
53
52 B A
54
D-26 (Y)
D-26 FLOOR
HARNESS
CONNECTOR
(REAR VIEW)
AC307915AB
CONNECTOR: D-33
D-33 (B)
FORWARD
CENTER
PILLAR
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