Mitsubishi Lancer Evolution IX. Manual — part 644
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-89
DIAGNOSIS PROCEDURE
STEP 1. Check the diagnosis code by connecting
a dummy resistor. (M.U.T.-II/III diagnosis code)
(1) Disconnect the negative battery terminal.
(2) Disconnect passenger's (front) seat belt
pre-tensioner connector D-03 <LHD> or D-16
<RHD>. Use a flat-tipped screwdriver to pull out
the locking button at the harness side connector,
and then disconnect the connector.
(3) Connect special tool dummy resistor (MB991865)
to special tool resistor harness (MB991884).
(4) Connect special tool (MB991884) to the D-03
<LHD> or D-16 <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 68 set?
YES :
Go to Step 2.
NO :
Replace the passenger's (front) seat belt
with pre-tensioner (Refer to
AC310465
AO
Connector: D-03
<LHD>
Harness side
connector
(front view)
D-03 (B)
AC310471
AJ
Connector: D-16
<RHD>
Harness side
connector
(front view)
D-16 (B)
AC300147AX
Flat-tipped
screwdriver
Locking button
D-03 <LHD>,
D-16 <RHD>
Passenger's (front)
seat belt
pre-tensioner
connector
D-03 <LHD>, D-16 <RHD>
Harness side connector
MB991884
MB991885
AC103283AY
D-03 <LHD>, D-16 <RHD>
Harness side connector
MB991884
(Resistor
Harness)
MB991865
(Dummy Resistor : 3 )
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-90
STEP 2. Voltage measurement at the SRS-ECU
connector C-13
(1) Disconnect SRS-ECU connector C-13.
(2) Disconnect passenger's (front) seat belt
pre-tensioner connector D-03 <LHD> or D-16
<RHD>. Use a flat-tipped screwdriver to pull out
the locking button at the harness side connector,
and then disconnect the connector.
(3) 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.
(4) Voltage measurement between C-13 harness
side connector terminals 27, 28 and body earth.
OK: 0 V
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the harness wires between
SRS-ECU connector C-13 (terminal No.27
and 28) and passenger's (front) seat belt
pre-tensioner connector D-03 <LHD> or
D-16 <RHD> (terminal No.1 and 2).
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code 68 set?
YES :
Replace the SRS-ECU (Refer to
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00
− How to Use
Troubleshooting/Inspection Service Points
).
AC101951
Connector: C-13
SRS-ECU
AL
C-13 (Y)
21
252627 282930 313233
34 35 3637 38394041 42
22
23 24
Harness side
connector
(rear view)
AC310465
AO
Connector: D-03
<LHD>
Harness side
connector
(front view)
D-03 (B)
AC310471
AJ
Connector: D-16
<RHD>
Harness side
connector
(front view)
D-16 (B)
AC300147AX
Flat-tipped
screwdriver
Locking button
D-03 <LHD>,
D-16 <RHD>
Passenger's (front)
seat belt
pre-tensioner
connector
D-03 <LHD>, D-16 <RHD>
Harness side connector
AC100341
34 35 36 37 38 39 40 41 42
25 26 27 28 29 30 31 32 33
21 22
23 24
AS
C-13 Harness side
connector (rear view)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-91
Code No.69: Passenger's (front) seat belt pre-tensioner (squib) system (short-circuited to the earth)
CONNECTOR
LOCK
SWITCH
CONNECTOR
LOCK
SWITCH
AIR BAG DRIVE CIRCUIT
MICROCOMPUTER
SRS-ECU
SEAT BELT
PRE-TENSIONER
(RH)
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet
NOTE
: CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF
Passenger's (Front) Seat Belt Pre-tensioner (Squib) (LHD)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-92
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 outputs 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 passenger's (front) seat
belt pre-tensioner wire(s) are short-circuited to the
earth.
PROBABLE CAUSES
• Damaged wiring harnesses or connectors
• Short to the earth in the passenger's (front) seat
belt pre-tensioner (squib) harness
• Malfunction of the SRS-ECU
CONNECTOR
LOCK
SWITCH
CONNECTOR
LOCK
SWITCH
AIR BAG DRIVE CIRCUIT
MICROCOMPUTER
SRS-ECU
SEAT BELT
PRE-TENSIONER
(LH)
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet
NOTE
: CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF
Passenger's (Front) Seat Belt Pre-tensioner (Squib) (RHD)
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