Mitsubishi Lancer Evolution 7. Manual — part 364
SRS -
Troubleshooting
52B-21
OK
<Check the circuit between the SRS-ECU and the front
passenger’s air bag module>
Measure at the C-21 SRS-ECU connector.
D
Disconnect the SRS-ECU connector C-21.
D
Disconnect the front passenger’s air bag module connector
C-109.
Caution
Disconnect the connector and short-circuit the squib
circuit before releasing the short bar of the SRS-ECU
connector in the following operation.
D
Cable bands between terminals 9, 10 and the short bar
(width:3 mm, thickness:0.5 mm) between terminals 11 and
12 and the short bar, and release the short bar.
(See Figure A.)
Caution
As the short bar may not be releasable if inserted
insufficiently, insert more than 4 mm.
D
Measure at the harness side
D
Continuity check between terminals 9 and 10
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
YES
NO
Replace the front passenger’s seat air bag module (squib).
Resistor harness
(MB991866)
Dummy resistor
(MB991865)
resistance (3Ω)
Instrumental panel
wiring harness
Front passenger’s air bag
module connector
<Check the front passenger’s air bag module (squib)>
MUT-II self-diag code
D
Connect the dummy resistor (MB991865) to the resistor harness
(MB991866).
D
Disconnect 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.
D
Connect the negative (-) terminal of the battery
D
Check the diagnosis code again after erasing the memory.
Is code No.24 output?
Check the trouble
symptoms.
NG
Check the harness between the front passenger’s air bag
module and the SRS-ECU, and repair if necessary.
NG
YES
NG
Correct
Check connector: C-21, C-109
Connector C-21
Figure A
Terminal
Short bar
Front view of C-21
SRS-ECU connector
(harness side).
Cable band
and etc.
Section
A - A
4 mm or more
A
A
Replace the SRS-ECU.
SRS -
Troubleshooting
52B-22
Code No.25 Front passenger’s air bag module (squib)
system
Possible Cause
This code is output when open circuit occurs in the SRS-ECU front passenger’s
air bag (squib) circuit.
However, SRS warning lamp goes out when a normal operation is resumed
(diagnosis code is not cleared.)
D
Open in the front passenger’s air bag module
(squib) circuit
D
Connector improper contact
D
SRS-ECU inoperable
NG
<Check the circuit between the SRS-ECU and the front
passenger’s air bag module>
Measure at the SRS-ECU connector C-21 and front
passenger’s air bag module connector C-109 .
D
Disconnect the SRS-ECU connector C-21 and the front
passenger’s air bag module connector C-109 , and
measure at the harness side.
D
Continuity check between the following terminals
Connector C-21
Connector C-109
9
–
2
10
–
1
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: Continuity (2Ω or less)
YES
NO
Replace the front passenger’s seat air bag module (squib).
<Check the front passenger’s air bag module (squib)>
MUT-II self-diag code
D
Connect the dummy resistor (MB991865) to the resistor harness
(MB991866).
D
Disconnect 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.
D
Connect the negative (-) terminal of the battery
D
Check the diagnosis code again after erasing the memory.
Is code No.25 output?
Replace the SRS-ECU.
Check the trouble
symptoms.
NG
Check the harness between the front passenger’s air bag
module and the SRS-ECU, and repair if necessary.
OK
NG
Correct
Check connector: C-21, C-109
OK
Resistor harness
(MB991866)
Dummy resistor
(MB991865)
resistance (3Ω)
Instrumental panel
wiring harness
Front passenger’s air bag
module connector
Connector C-21
Connector C-109
SRS -
Troubleshooting
52B-23
Code No.26 Driver’s seat belt pre-tensioner (squib)
system
Possible Cause
This code is output when short circuit occurs between terminals of the
SRS-ECU driver’s seat belt pre-tensioner (squib) circuit.
However, SRS warning lamp goes out when a normal operation is resumed
(diagnosis code is not cleared.)
D
Connector engagement faulty or short bar faulty*
D
Short circuit between terminals of the driver’s seat
belt pre-tensioner (squib) circuit
D
Faulty connector
D
SRS-ECU inoperable
NOTE:
*: The connector of the squib circuit contains a short bar (short-circuiting the positive (+) cable and the
negative (-) cable to avoid an erroneous deployment caused by static electricity when a connector is
not connected). Thus, when a connector is connected, the short bar may not be released due to improper
engagement of the connector or faulty connector as shown in the illustration below. Disconnect the connector
as shown in the illustration below, then reconnect it. Check that a diagnosis code is output again after
erasing the memory. If the diagnosis code is not output, the above-mentioned code is output due to
improper engagement of the connector.
C-41
C-133*
1,
C-112*
2
SRS-ECU
Driver’s seat belt
pre-tensioner
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
D-28*
1,
D-26*
2
SRS -
Troubleshooting
52B-24
OK
YES
NO
Replace the driver’s seat belt pre-tensioner.
<Check the driver’s seat belt pre-tensioner (squib)>
MUT-II self-diag code
D
Connect the dummy resistor (MB991865) to the resistor harness
(MB991866).
D
Disconnect the driver’s seat belt pre-tensioner connector D-28*
1
and
D-26
*2
and connect to 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.
D
Connect the negative (-) terminal of the battery
D
Check the diagnosis code again after erasing the memory.
Is code No.26 output?
Replace the SRS-ECU.
Check the trouble
symptoms.
NG
Check the harness between the driver’s seat belt
pre-tensioner and the SRS-ECU, and repair if necessary.
YES
NG
Correct
Check connector: D-28*
1,
D-26
*2,
C-133
*1
, C-112
*2
, C-41
Driver’s seat belt
pre-tensioner connector
<Check the circuit between the SRS-ECU and the driver’s
seat belt pretensioner>
Measure at the SRS-ECU connector C-41.
D
Disconnect the SRS-ECU connector C-41.
D
Disconnect the driver’s seat belt pre-tensioner connector
D-28*
1
and D-26
*2
.
Caution
Disconnect the connector and short-circuit the squib
circuit before releasing the short bar of the SRS-ECU
connector in the following operation.
D
Cable bands between terminals 29, 30 and the short bar
(width:3 mm, thickness:0.5 mm) between terminals 11 and
12 and the short bar, and release the short bar.
(See Figure A.)
Caution
As the short bar may not be releasable if inserted
insufficiently, insert more than 4 mm.
D
Measure at the harness side
D
Continuity check between terminals 29 and 30
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
Resistor harness
(MB991866)
Dummy resistor (MB991865)
resistance (3Ω)
Instrumental panel
wiring harness
Connector C-41
NG
Figure A
Terminal
Short bar
Front view of SRS-ECU
connector C-41
(harness side)
Cable
band and etc.
Section
A - A
4 mm or more
A
A
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
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