Mitsubishi L200. Manual — part 600
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-71
YES :
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).
Code No.B1604: Seat belt pre-tensioner (driver's side) (squib) system (open-circuited in the squib
circuit)
AC805782
Seat Belt Pre-tensioner (Driver's Side) (Squib)
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
NOTE
: CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple
AE
SEAT BELT
PRE-TENSIONER
CONNECTOR
LOCK SWITCH
<RHD>
<LHD>
OPERATION
The SRS-ECU judges how severe a collision is by
detecting signals from the front impact sensors and
the front air bag analogue 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 seat belt pre-tensioner will
deploy.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if seat belt pre-tensioner
(driver's side) squib wire(s) are open-circuited.
PROBABLE CAUSES
• Improper connector contact
• Open circuit in the seat belt pre-tensioner
(driver's side) (squib) circuit
• Malfunction of the SRS-ECU
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-72
DIAGNOSIS PROCEDURE
STEP 1. Check the diagnosis code by connecting
a dummy resistor. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.
AC501889
AE
Harness side
connector
(front view)
Connectors: D-15 <LHD>, D-23 <RHD>
Centre
pillar
D-23 (B)
D-15 (B)
AC300147AV
Seat belt
pre-tensioner
connector
Flat-tipped
screwdriver
Locking button
Harness side connector
(2) Disconnect seat belt pre-tensioner (driver's side)
connector D-15 <LHD> or D-23 <RHD>. Use a
flat-tipped screwdriver to pull out the locking
button at the harness side connector, and then
disconnect the connector.
AC501975
MB991865
(Dummy
resistor : 3 )
MB991884
(Resistor
harness)
AF
Harness
side connector
(3) Connect special tool dummy resistor (MB991865)
to special tool resistor harness (MB991884).
(4) Connect special tool (MB991884) to the D-15
<LHD> or D-23 <RHD> harness side connector.
(5) Connect the negative battery terminal.
(6) Erase diagnosis code memory, and then check
the diagnosis code.
Q: Is diagnosis code B1604 set?
YES :
Go to Step 2.
NO :
Replace the seat belt with pre-tensioner
(driver's side) (Refer to
).
STEP 2. Resistance measurement between SRS-
ECU connector C-130 (terminal No.29 and 30)
and the seat belt pre-tensioner (driver's side)
connector D-15 <LHD> or D-23 <RHD> (terminal
No.2 and 1).
(1) Disconnect the negative battery terminal.
AC501670
AC
C-130 (Y)
Connector: C-130
Harness side
connector
(rear view)
(2) Disconnect SRS-ECU connector C-130.
DANGER
To prevents the seat belt pre-tensioner from
operating unintentionally, disconnect the
seat belt pre-tensioner (driver's side) con-
nector D-15 <LHD> or D-23 <RHD> to short
the squib circuit.
AC501889
AE
Harness side
connector
(front view)
Connectors: D-15 <LHD>, D-23 <RHD>
Centre
pillar
D-23 (B)
D-15 (B)
AC300147AV
Seat belt
pre-tensioner
connector
Flat-tipped
screwdriver
Locking button
Harness side connector
(3) Disconnect seat belt pre-tensioner (driver's side)
connector D-15 <LHD> or D-23 <RHD>. Use a
flat-tipped screwdriver to pull out the locking
button at the harness side connector, and then
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-73
disconnect the connector.
AC300977
Section
A - A
C-130 Harness side connector
(front view)
Cable tie
Short spring
4 mm or more
Terminal
A
A
AE
CAUTION
Insert an insulator such as a cable tie to a depth
of 4mm or more, otherwise the short spring will
not be released.
(4) Insert a cable tie [3 mm wide, 0.5 mm thick]
between terminals 29, 30 and the short spring to
release the short spring.
AC201287CQ
H
arness side
connector
MB991884
(5) Connect D-15 <LHD> or D-23 <RHD> harness
side connector to special tool resistor harness
(MB991884).
AC501402
C-130
Harness side
connectors (rear view)
Special tool
MB991884
BP
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(6) Resistance measurement between the following
terminals.
• SRS-ECU connector C-130 terminal No.29
and special tool terminal No.2
• SRS-ECU connector C-130 terminal No.30
and special tool terminal No.1
OK: Continuity (Less than 2
Ω)
Q: Are the check results normal?
YES :
Go to Step 3.
NO :
Repair the harness wires between SRS-
ECU connector C-130 (terminal No.29 and
30) and the seat belt pre-tensioner (driver's
side) connector D-15 <LHD> or D-23
<RHD> (terminal No.1 and 2)
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.B1604 set?
YES :
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-74
Code No.B1605: Seat belt pre-tensioner (driver's side) (squib) system (short-circuited to the earth)
AC805782
Seat Belt Pre-tensioner (Driver's Side) (Squib)
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
NOTE
: CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple
AE
SEAT BELT
PRE-TENSIONER
CONNECTOR
LOCK SWITCH
<RHD>
<LHD>
OPERATION
The SRS-ECU judges how severe a collision is by
detecting signals from the front impact sensors and
the front air bag analogue 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 seat belt pre-tensioner will
deploy.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if the seat belt pre-ten-
sioner (driver's side) wire(s) are short-circuited to the
earth.
PROBABLE CAUSES
• Damaged wiring harnesses or connectors
• Short to the earth in the seat belt pre-tensioner
(driver's side) (squib) harness
• Malfunction of the SRS-ECU
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