Mitsubishi Lancer Evolution IX. Manual — part 643
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-85
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 driver's seat belt pre-tensioner
connector D-16 <LHD> or D-03 <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-16
<LHD> or D-03 <RHD> harness side connector.
(5) Connect the negative battery terminal.
(6) Erase diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code 67 set?
YES :
Go to Step 2.
NO :
Replace the driver's seat belt with
pre-tensioner (Refer to
AC310465
AN
Connector: D-16
<LHD>
Harness side
connector
(front view)
D-16 (B)
AC310471
Ai
Connector: D-03
<RHD>
Harness side
connector
(front view)
D-03 (B)
AC300147AW
Flat-tipped
screwdriver
Locking button
D-16 <LHD>,
D-03 <RHD>
Driver's seat
belt pre-tensioner
connector
D-16 <LHD>, D-03 <RHD>
Harness side connector
MB991884
MB991885
AC300975 AI
MB991865
(Dummy resistor : 3 )
MB991884
(Resistor
harness)
D-16 <LHD>, D-03 <RHD>
Harness side connectors
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-86
STEP 2. Resistance measurement at the
SRS-ECU connector C-13
(1) Disconnect SRS-ECU connector C-13.
(2) Disconnect driver's seat belt pre-tensioner
connector D-16 <LHD> or D-03 <RHD>. Use a
flat-tipped screwdriver to pull out the locking
button at the harness side connector, 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) Resistance measurement between C-13 harness
side connector terminals 29, 30 and body earth.
OK: Open circuit
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the harnss wire between SRS-ECU
connector C-13 (terminal No.29 and 30) and
driver’s seat belt pre-tensioner connector
D-16 <LHD> or D-03 <RHD> (terminal No.1
and 2).
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code 67 set?
YES :
Replace the SRS-ECU (Refer
).
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
AN
Connector: D-16
<LHD>
Harness side
connector
(front view)
D-16 (B)
AC310471
Ai
Connector: D-03
<RHD>
Harness side
connector
(front view)
D-03 (B)
AC300147AW
Flat-tipped
screwdriver
Locking button
D-16 <LHD>,
D-03 <RHD>
Driver's seat
belt pre-tensioner
connector
D-16 <LHD>, D-03 <RHD>
Harness side connector
AC201666
34 35 36 37 38 39 40 41 42
25 26 27 28 29 30 31 32 33
2122
23 24
AM
C-13 Harness side
connector (rear view)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-87
Code No.68: Passenger's (front) seat belt pre-tensioner (squib) system (short-circuited to the power
supply)
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-88
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
power supply.
PROBABLE CAUSES
• Damaged wiring harnesses or connectors
• Short to the power supply 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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