wiring MITSUBISHI LANCER EVOLUTION 2007 Service Repair Manual

SRS -Troubleshooting52B-32
Code No.42 Power supply circuit system (fuse No.3
circuit)Possible Cause
This code is output when the voltage between terminal IG1(SRS-ECU, terminal
No.13) and earth has been below the standard value for 5 seconds.
However, code No.42 is automatically erased and SRS warning lamp goes out
when a normal operation is resumed.If code No.41 and 42 are output at the
same time, check the battery first since the battery voltage may have decreased.DHarness or connector fault
DSRS-ECU inoperable
OK
Check the other circuits using the general
fuse No.3. (See the Electrical Wiring
Diagram.)
NGOK
NG
NG
NG
Check connector:C-21, C-213, C-210
Check the trouble
symptoms.Correct
Check the harness between the SRS-ECU and the ignition
switch IG
1, and repair if necessary.
NG
Fuse disconnection
Fuse disconnection
OK
Replace the SRS-ECU.
switch IG
1
>Measure at the SRS-ECU connector C - 21.
DDisconnect the SRS-ECU connector C-21 and measure at
the harness side.
DConnect the negative ( - ) terminal of the battery
DIgnition switch: ON
DVoltage between terminal 13 and body earth
Caution
Do not directly insert a probe or other devices at the
front of the connector to avoid a possible decrease in
the contact pressure.
OK:9 V or more
OK
Check the harness between the SRS-ECU and junction block,
and repair if necessary. block>
Measure at the C-21 SRS-ECU connector.
DDisconnect the SRS-ECU connector C-21 and measure at
the harness side.
DContinuity check between terminal 13 and body earth
Caution
Do not directly insert a probe or other devices at the
front of the connector to avoid a possible decrease in
the contact pressure.
OK:No continuity
Replace the SRS-ECU.Fuse is normal
Check the junction block general fuse No.3.
Check when fuse disconnects
DReplace the fuse.
DTurn the ignition switch to the ON position and then turn it
to the OFF position after one minute or more has passed.
Check the fuse.
block>
Measure at the junction block connector C-213.
DDisconnect the junction block connector C-213 and
measure at the harness side.
DContinuity check between terminal 7 and body earth
Caution
Do not directly insert a probe or other devices at the
front of the connector to avoid a possible decrease in
the contact pressure.
OK:No continuityConnector C-21
Connector C-213
Connector C-21

SRS -Troubleshooting52B-33
Code No.43 SRS warning lamp drive circuit system (lamp
does not illuminate)Possible Cause
This code is output when open circuit has occurred in the SRS warning lamp
drive circuit for 5 seconds or more. However, if the code is output due to open
circuit faulty, code No.43 is automatically erased and the SRS warning lamp
functions normally as soon as a normal operation is resumed.DHarness or connector fault
DBulb fault
DSRS-ECU inoperable
DCombination meter fault
NGNG
NGOK
NG
NGOK
Check the trouble symptoms.
NG
Correct
Check the harness between the SRS-ECU, the combination
meter, and the ignition switch IG1.
OK
Replace the SRS-ECU.Correct
Correct
OK
Check connector:C-21, C-213, C-29, C-01, C-02
Check the SRS warning lamp.
DConnect the negative ( - ) terminal of the battery
DIgnition switch: ON
DDoes the lamp illuminate when the SRS-ECU connector C-21 is
disconnected?
OK:Lamp illuminates.Check the bulb.
Replace the combination meter. OK
CorrectCheck the harness between the SRS-ECU and the
ignition switch IG
1.
Code No.43 SRS warning lamp drive circuit system
(Lamp does not go out)Probable cause
Harness between SRS warning lamp and SRS-ECU is being shorted to earth
However, once trouble is extinguished, this code will be automatically erased,
and SRS warning lamp will go out.DHarnesses or connector fault
DSRS-ECU inoperable
DCombination meter fault
NO
OKNG
NG
NG
Replace combination meter.
Check the SRS warning lamp.
DConnect negative (–) battery
terminal.
DIgnition switch: ON
DDoes lamp go out when
combination meter connector
C-02 is disconnected?YESCheck the following connectors:C-02,
C-21
Check trouble symptoms.
OK
Replace the SRS-ECU.
Check the wiring harness between
SRS-ECU and combination meter
.
Repair
Repair NG
Code No.44 SRS warning lamp drive circuit systemProbable cause
Short is present in SRS warning lamp drive circuit, or output transistor in
SRS-ECU is defective.
However, once trouble is extinguished, this code will be automatically erased,
and SRS warning lamp will go out.DHarnesses or connector fault
DSRS-ECU inoperable
Check the SRS warning lamp drive circuit system.
(Refer to P.52B-33.)OKReplace the SRS-ECU.

SRS -Troubleshooting52B-38
Code No.64 Front passenger’s air bag module (squib)
system (short-circuited to power supply)Possible Cause
Code No.65 Front passenger’s air bag module (squib)
system (short-circuited to earth)
This code is output when the input terminal of the SRS-ECU front passenger’s
air bag module (squib) is short-circuited to power supply (code No.64) or
short-circuited to earth (code No.65).DHarness or connector fault
DThe harness of the front passenger’s air bag
module (squib) is short-circuited to power supply
(code No.64) or short-circuited to earth (code
No.65).
DSRS-ECU inoperable
the front passenger’s air bag module>
Measure at the SRS-ECU connector C-21.
DDisconnect the SRS-ECU connector C-21.
DDisconnect the front passenger’s air bag
module connector C-109 .
DMeasure at the harness side
DContinuity between terminal 9 or 10 and body
earth
Caution
Do not directly insert a probe or other
devices at the front of the connector to
avoid a possible decrease in the contact
pressure.
OK:No continuity
NO
Replace the front passenger’s seat air bag module (squib).

MUT-II self-diag code
DConnect the dummy resistor (MB991865) to the resistor harness
(MB991866).
DDisconnect the front passenger’s air bag module connector C-109
and insert the resistor harness (MB991866) behind the harness side
connector.
Caution
Do not directly insert a probe or other devices at the front of the
connector to avoid a possible decrease in the contact pressure.
DConnect the negative ( - ) terminal of the battery
DCheck the diagnosis code again after erasing the memory.
Is code No.64 or No.65 output?
YES (when No.65 is output)YES (when No.64 is output)
Replace the SRS-ECU.
the front passenger’s air bag module>
Measure at the SRS-ECU connector C-21.
DDisconnect the SRS-ECU connector C-21.
DDisconnect the front passenger’s air bag
module connector C-109 .
DIgnition switch:ON
DMeasure at the harness side
DVoltage between terminal 9 or 10 and body
earth
Caution
Do not directly insert a probe or other
devices at the front of the connector to
avoid a possible decrease in the contact
pressure.
OK:0V
NG
Replace the SRS-ECU.
Correct
Check connector:C-21, C-109
Check the trouble symptoms.
Check the harness between the front
passenger’s air bag module and the
SRS-ECU, and repair if necessary.OK
NG
OK
NG
OK
NG
Resistor harness
(MB991866) Dummy resistor
(MB991865)
resistance (3Ω)
Instrumental panel
wiring harness
Front passenger’s air bag
module connector
Connector C-21Connector C-21

SRS -Troubleshooting52B-39
Code No.66 Driver’s seat belt pre-tensioner (squib)
system (short-circuited to power supply)Possible Cause
Code No.67 Driver’s seat belt pre-tensioner (squib)
system (short-circuited to earth)
This code is output when the input terminal of the SRS-ECU driver’s seat belt
pre-tensioner (squib) is short-circuited to power supply (code No.66) or
short-circuited to earth (code No.67).DHarness or connector fault
DThe harness of the driver’s seat belt pre-tensioner
(squib) is short-circuited to power supply (code
No.66) or short-circuited to earth (code No.67).
DSRS-ECU inoperable
Replace the SRS-ECU. OK
the driver’s seat belt pre-tensioner>
Measure at the SRS-ECU connector C-41 .
DDisconnect the SRS-ECU connector C-41.
DDisconnect the driver’s seat belt pre-tensioner
D-28*
1and D-26*2.
DMeasure at the harness side
DContinuity between terminal 29 or 30 and
body earth
Caution
Do not directly insert a probe or other
devices at the front of the connector to
avoid a possible decrease in the contact
pressure.
OK:No continuity
NO
Replace the driver’s seat belt pre-tensioner.

MUT-II self-diag code
DConnect the dummy resistor (MB991865) to the resistor harness
(MB991866).
DDisconnect the driver’s seat belt pre-tensioner connector D-28*
1and
D-26*2and insert the resistor harness (MB991866) behind the
harness side connector.
Caution
Do not directly insert a probe or other devices at the front of the
connector to avoid a possible decrease in the contact pressure.
DConnect the negative ( - ) terminal of the battery
DCheck the diagnosis code again after erasing the memory.
Is code No.66 or No.67 output?
YES (when No.67 is output)YES (when No.66 is output)
Replace the SRS-ECU.
the driver’s seat belt pre-tensioner>
Measure at the SRS-ECU connector C-41 .
DDisconnect the SRS-ECU connector C-41.
DDisconnect the driver’s seat belt pre-tensioner
D-28*
1and D-26*2.
DIgnition switch:ON
DMeasure at the harness side
DVoltage between terminal 29 or 30 and body
earth
Caution
Do not directly insert a probe or other
devices at the front of the connector to
avoid a possible decrease in the contact
pressure.
OK:0V
NG
Check connector:D-28*1, D-26*2, C-133*1, C-112*2, C-41
Check the trouble symptoms.
Check the harness between the driver’s seat belt pre-tensioner and the SRS-ECU,
and repair if necessary.
NG
OK
NG
OKResistor harness
(MB991866) Dummy resistor
(MB991865)
resistance (3Ω)
Instrumental panel
wiring harness
Driver’s seat belt
pre-tensioner connector
Connector C-41
Connector C-41
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles

SRS -Troubleshooting52B-40
Code No.68 Front passenger’s seat belt pre-tensioner
(squib) system (short-circuited to power supply)Possible Cause
Code No.69 Front passenger’s seat belt pre-tensioner
(squib) system (short-circuited to earth)
This code is output when the input terminal of the SRS-ECU front passenger’s
seat belt pre-tensioner (squib) is short-circuited to power supply (code No.68) or
short-circuited to earth (code No.69).DHarness or connector fault
DThe harness of the front passenger’s seat belt
pre-tensioner (squib) is short-circuited to power
supply (code No.68) or short-circuited to earth
(code No.69).
DSRS-ECU inoperable
NO
Replace the front passenger’s seat belt pre-tensioner.

MUT-II self-diag code
DConnect the dummy resistor (MB991865) to the resistor harness
(MB991866).
DDisconnect the front passenger’s seat belt pre-tensioner connector
D-28*
1and D-26*2and insert the resistor harness (MB991866)
behind the harness side connector.
Caution
Do not directly insert a probe or other devices at the front of the
connector to avoid a possible decrease in the contact pressure.
DConnect the negative ( - ) terminal of the battery
DCheck the diagnosis code again after erasing the memory.
Is code No.68 or No.69 output?
YES (when No.69 is output)YES (when No.68 is output)
Replace the SRS-ECU.
the front passenger’s seat belt pre-tensioner>
Measure at the SRS-ECU connector C-41 .
DDisconnect the SRS-ECU connector C-41.
DDisconnect the front passenger’s seat belt
pre-tensioner connector D-28*
1and D-26*2.
DIgnition switch:ON
DMeasure at the harness side
DVoltage between terminal 27 or 28 and body
earth
Caution
Do not directly insert a probe or other
devices at the front of the connector to
avoid a possible decrease in the contact
pressure.
OK:0V
NG
Replace the SRS-ECU.
Correct
Check connector:D-28*1, D-26*2, C-133*1, C-112*2, C-41
Check the trouble symptoms.
Check the harness between the front passenger’s seat belt pre-tensioner and the
SRS-ECU, and repair if necessary.OK
the front passenger’s seat belt pre-tensioner>
Measure at the SRS-ECU connector C-41 .
DDisconnect the SRS-ECU connector C-41.
DDisconnect the front passenger’s seat belt
pre-tensioner connector D-28*
1and D-26*2.
DMeasure at the harness side
DContinuity between terminal 27 or 28 and
body earth
Caution
Do not directly insert a probe or other
devices at the front of the connector to
avoid a possible decrease in the contact
pressure.
OK:No continuity
NG
OK
NG
OK
NG
Resistor harness
(MB991866) Dummy resistor
(MB991865)
resistance (3Ω)
Instrumental panel
wiring harness
Front passenger’s seat belt
pre-tensioner connector
Connector C-41 Connector C-41
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles

SRS - SRS Maintenance52B-44
REPLACE ANY VISUALLY INSPECTED PART IF IT
FAILS THAT INSPECTION. (Refer to P.52B-52.)
Caution
The SRS may not activate if any of the above
components is not installed properly, which could
result in serious injury or death to the vehicle’s driver
or front passenger.
INSTRUMENT PANEL WIRING HARNESS
Instrument panel wiring harness
1. Check connector for poor connection.
2. Check harnesses for binds, connectors for damage, and
terminals for deformation.
REPLACE ANY CONNECTORS OR HARNESS THAT
FAIL THE VISUAL INSPECTION. (Refer to P.52B-3.)
Caution
The SRS may not activate if SRS harnesses or
connectors are damaged or improperly connected,
which could result in serious injury or death to the
vehicle’s driver or front passenger.
POST-INSTALLATION INSPECTION
Reconnect the negative battery terminal. Turn the ignition
switch to the ON position. Does the SRS warning lamp
illuminate for about 7 seconds, and then go out? If yes, SRS
system is functioning properly. If no, consult page 52B-6.
SRS warning lamp

SRS - Post-collision Diagnosis52B-45
POST-COLLISION DIAGNOSIS
Whether or not the air bags have deployed, check and service
the vehicle after collision as follows:
SRS-ECU MEMORY CHECK
1. Connect the MUT-IIto the diagnosis connector. (Refer
to GROUP 00 – How to Use Troubleshooting/Inspection
Service Points.)
Caution
Refer to that the ignition switch is LOCK(OFF) when
connecting or disconnecting MUT-II.
2. Read (and write down) all displayed diagnosis codes.
(Refer to P.52B-9.)
NOTE
If battery power supply has been shut down by the
collision, the MUT-IIcannot communicate with the
SRS-ECU. Check and, repair if necessary, the instrument
panel wiring harness before the next job.
3. Use the the MUT-IIto read the data list (how long trouble(s)
have continued and how often memory have been
erased).
Data list
NoService Data ItemApplicability
92Number indication how often the memory is cleared.Maximum time to be stored: 250
93How long problem have lasted (How long it takes
from the occurrence of the problem till the first air bag
squib igniting signal)Maximum time to be stored: 9999 minutes
(approximately 7 days)
94How long problem(s) have lasted (How long it takes
from the first air bag squib igniting signal till now.)
4. Erase the diagnosis codes and after waiting 5 seconds
or more read (and write down) all displayed diagnosis
codes. (Refer to P.52B-9.)

SRS - Post-collision Diagnosis52B-46
REPAIR PROCEDURE
DEPLOYED DRIVER’S AND FRONT PASSENGER’S AIR
BAGS OR OPERATED SEAT BELT PRE-TENSIONER.
1. Replace the following parts with new ones.
DSRS-ECU (Refer to P.52B-50.)
DDriver’s air bag module (Refer to P.52B-52.)
DFront passenger’s air bag module (Refer to P.52B-52.)
DSeat belt with pre-tensioner (Refer to P.52B-61.)
2. Check the following parts and replace if malfunction is
found:
DClock spring (Refer to P.52B-52.)
DSteering wheel, steering column and intermediate
joint
(1) Check the wiring harness (built into steering
wheel) and connectors for damage, and terminals
for deformation.
(2) Check the driver’s air bag module for proper
installation to the steering wheel.
(3) Check the steering wheel for noise, binds or
difficult operation and excessive free play.
3. Check the harness for binding, connectors for damage,
poor connections, and terminals for deformation.
(Refer to P.52B-44.)
UNDEPLOYED AIR BAGS OR UNOPERATED SEAT BELT
WITH PRE-TENSIONER IN LOW-SPEED COLLISION
Check the SRS components and seat belt with pre-tensioner.
If visible damage such as dents, cracks, or deformation are
found on the SRS components and seat belt with
pre-tensioner, replace them with new ones. Concerning parts
removed for inspection, replacement with new parts and
cautions in working, refer to INDIVIDUAL COMPONENT
SERVICE, P.52B-49.

SRS - Post-collision Diagnosis52B-48
Steering wheel, steering column and intermediate joint
1. Check the driver’s air bag module for proper installation
to the steering wheel.
2. Check the steering wheel for noise, binds or difficult
operation and excessive free play.
Harness connector (Instrument panel wiring harness,
Floor wiring harness)
Check the harness for binds, the connector for damage and
the terminals for deformation. (Refer to P.52B-44.)
Seat belt with pre-tensioner
1. Check the seat belt for damage or deformation.
2. Check the pre-tensioner for cracks or deformation.
3. Check the harness or the connector for damage, and
the terminal for deformation.
4. Check that the unit is installed correctly to the vehicle
body.

SRS -AirBagModuleandSeatBeltPre-tensioner
Disposal Procedures52B-65
Driver’s air bag module
(1) Remove the steering column cover, lower.
(Refer to GROUP 52A – Instrument Panel.)
(2) Disconnect the clock spring 2-pin connector and
instrument panel wiring harness connector (2-pin,
yellow).
NOTE
Once disconnected from the instrument panel wiring
harness, both electrodes of the clock spring connector
short automatically. This prevents the driver’s air bag
from accidental deployment caused by static, etc.
(3) Connect deployment harnesses longer than 6 m to
each SRS air bag adapter harness and insulate the
connections with plastic tape.
Also, connect the deployment harnesses in the other
ends to short, thereby preventing the driver’s air bag
from accidental deployment caused by static etc.
(4) Connect the SRS air bag adapter harness to the
clock spring 2-pin connector and route the deployment
harnesses out of the vehicle.
(5) Close all the doors with the windows fully closed and
put a cover over the vehicle to minimize report.
Caution
The cover is required as the glass, if already
damaged, may break.
(6) Separate the deployment harnesses as far from the
vehicle as possible and connect to the terminals of the
battery removed from the vehicle. Then deploy.
Caution
1) Before deploying the air bag, see that no one is in
and near the vehicle. Also, put on safety glasses.
2) The deployment makes the inflator of the
driver’s air bag very hot. Before handling the
inflator, wait more than 30 minutes for cooling.
3) If the driver’s air bag module fails to deploy
although the procedure is respected, do not go
near the module. Contact your local distributor.
(7) Discard the deployed air bag module according to
Deployed Air Bag Module Disposal Procedures.
(Refer to P.52B-75.)
Instrument panel wiring
harness connector
(2-pin yellow)Clock spring
2-pin connector
SRS air bag
adapter harness
MB372530Shorted
6 m or longer
Insulation
tape Deployment harnesses
Clock spring
2-pin connector
SRS air bag adapter
harness MB372530
Deployment
harnesses
Cover
Deployment
harnesses