Mitsubishi Lancer Evolution 8. Manual — part 111
SRS AIRBAGS – TROUBLESHOOTING
52B-9
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Replace the driver’s airbag module (squib)
Replace the clock spring
(Checking the driver’s airbag module (squib))
MUT-II/III diagnosis code
• Detach the (–) terminal of the battery
• Detach the driver’s airbag module connector C-207
• Connect the dummy resistor (MB991865) to the resistor
harness (MB 991866)
• Insert the probe of the resistor harness (MB991866) behind
the driver’s airbag module connector C-207 of the clock
spring
Caution
Do not insert the probe directly into the terminal from
the front side of the connector, as this may cause a
reduction in contact pressure.
• Connect the (–) terminal of the battery.
• After erasing the diagnosis code memory, reconfirm the
diagnosis code.
Is Code No.21 output?
(Checking the clock spring)
MUT-II/III diagnosis code
• Detach the (–) terminal of the battery
• Detach the clock spring connector (4 pin) C-204
• Connect the dummy resistor (MB991865) to the resistor
harness (MB991866)
• Insert the probe of the resistor harness (MB991866)
between terminal 3 and 4, behind the clock spring connector
C-204 (harness side)
Caution
Do not insert the probe directly into the terminal from
the front side of the connector, as this may cause a
reduction in contact pressure.
• Connect the (–) terminal of the battery.
• After erasing the diagnosis code memory, reconfirm the
diagnosis code.
Is Code No.21 output?
(Type 1)
Dummy resistor
(MB991865)
resistance (3
Ω
)
Resistor harness
MB991866
C-207
Driver’s airbag module
connector
Dummy resistor
MB991865
resistance (3
Ω
)
Resistor harness
MB991866
C-204 Clock spring connector
(harness side)
NO
YES
YES
NO
(Checking the circuit between the SRS-ECU and the
clock spring)
Measure at the SRS-ECU connector C-125
• Detach the SRS-ECU connector C-125
• Detach the clock spring connector C-204
Caution
In the following operation, detach the SRS-ECU
connector and short the squib circuit before
releasing the short bar of the connector.
• Insert insulating material, such as cable bands (3mm
wide, 0.5mm thick), between the short bar and the
terminals 11, 12 of the SRS-ECU connector (harness
side) C-125. Release the short bar. (See Fig. A)
Caution
If the insulating material is not inserted sufficiently,
then it may be impossible to release the short bar.
Ensure that the insulating material is inserted to a
depth of at least 4mm.
• Check connectivity between 11 and 12
Caution
Do not insert the probe, etc. directly into the
terminal from the front side of the connector, as
this may cause a reduction in contact pressure.
OK : No connectivity
SRS AIRBAGS – TROUBLESHOOTING
52B-10
From previous page
Check connectors: C-125, C-204
Check the harness between the clock spring and the
SRS-ECU, and repair.
Confirm the symptoms
Replace the SRS-ECU
C-125 connector
Fig. A
C-125 SRS-ECU connector
(harness side) Front view
Terminal
Cable band, etc.
Section
A-A
at least 4mm
Short bar
YES
OK
OK
NG
NG
Repair
(Checking the driver’s airbag and clock spring)
MUT-II/III diagnosis code
• Detach the (–) terminal of the battery
• Detach the clock spring connector (4-pin) C-204
• Connect the dummy resistor (MB991865) to the resistor harness
(MB 991866)
• Insert the probe of the resistor harness (MB991866) between
terminals 3 and 4, behind clock spring connector C-204 (harness
side)
Caution
Do not insert the probe directly into the terminal from the front
side of the connector, as this may cause a reduction in contact
pressure.
• Connect the (–) terminal of the battery.
• After erasing the diagnosis code memory, reconfirm the diagnosis
code.
Is Code No.21 output?
SRS AIRBAGS – TROUBLESHOOTING
52B-11
Replace the SRS-ECU
Check connectors: C-125, C-203
Check the harness between the clock spring and the
SRS-ECU, and repair.
Confirm the fault
symptoms
Replace the clock spring
Replace the driver’s
airbag module (squib)
Check the clock spring (see p.52B-33)
(Type 2)
(Checking the circuit between the SRS-ECU and the
clock spring)
Measure at the SRS-ECU connector C-125
• Detach the SRS-ECU connector C-125
• Detach the clock spring connector C-203
Caution
In the following operation, detach the SRS-ECU
connector and short the squib circuit before
releasing the short bar of the connector.
• Insert insulating material, such as cable bands (3mm
wide, 0.5mm thick), between the short bar and the
terminals 11, 12. Release the short bar. (See Fig. A)
Caution
If the insulating material is not inserted sufficiently,
then it may be impossible to release the short bar.
Ensure that the insulating material is inserted to a
depth of at least 4mm.
• Measure at the harness side
• Check connectivity between 11 and 12
Caution
Do not insert the probe, etc. directly into the
terminal from the front side of the connector, as
this may cause a reduction in contact pressure.
OK: No connectivity
Dummy resistor
(MB991865)
resistance (3Ω)
Resistor harness
(MB991866)
C-204 Clock spring connector
(harness side)
C-125 connector
Y1720AU
YES
OK
NG
OK
OK
NG
NG
NO
NG
Repair
Fig. A
C-125 SRS-ECU connector
(harness side) Front view
Terminal
Cable band, etc.
Section
A – A
4mm or more
Short bar
(Checking the clock spring)
MUT-II/III diagnosis code
• Detach the (–) terminal of the battery
• Detach the clock spring connector (4-pin) C-204
• Connect the dummy resistor (MB991865) to the resistor
harness (MB 991866)
• Insert the probe of the resistor harness (MB991866)
between terminals 3 and 4, behind clock spring connector
C-204 (harness side)
Caution
Do not insert the probe directly into the terminal from
the front side of the connector, as this may cause a
reduction in contact pressure.
• Connect the (–) terminal of the battery.
• After erasing the diagnosis code memory, reconfirm the
diagnosis code.
Is Code No.22 output?
(Checking the driver’s airbag module (squib))
MUT-II/III diagnosis code
• Detach the (–) terminal of the battery
• Detach the driver's airbag module connector C-207
• Connect the dummy resistor (MB991865) to the resistor
harness (MB 991866)
• Insert the probe of the resistor harness (MB991866) behind
the driver's airbag module connector C-207 of the clock
spring.
Caution
Do not insert the probe directly into the terminal from
the front side of the connector, as this may cause a
reduction in contact pressure.
• Connect the (–) terminal of the battery.
• After erasing the diagnosis code memory, reconfirm the
diagnosis code.
Is Code No.22 output?
SRS AIRBAGS – TROUBLESHOOTING
52B-12
(Type 1)
Replace the driver's airbag module (squib)
To next page
Replace the clock spring
Code No. 22 Driver’s airbag module (squib) system
Possible cause
This code is output when there is a disconnection in the driver’s airbag module
(squib) circuit of the SRS-ECU.
When normal operation is resumed, the SRS warning light goes out.
(The diagnosis code is not erased.)
• Disconnection of the clock spring
• Half-disconnection due to incorrect neutral
positioning of the clock spring
• Disconnection in the driver’s airbag
module (squib) circuit
• Detachment of the driver’s airbag module
(squib) connector
• Connector contact fault
• SRS-ECU fault
Dummy resistor
(MB991865)
resistance (3Ω)
Resistor harness
(MB991866)
C-207 Driver's airbag
module connector
Dummy resistor
(MB991865)
resistance (3Ω)
Resistor harness
(MB991866)
C-204 Clock spring connector
(harness side)
YES
YES
NO
NO
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