Mitsubishi Lancer Evolution 8. Manual — part 113
(Checking the driver’s seat belt pre-tensioner (squib))
MUT-II/III diagnosis code
• Detach the (–) terminal of the battery
• Detach the driver’s seat belt pre-tensioner connector D-02
(see p.52B-34)
• Connect the dummy resistor (MB991865) to the resistor
harness (MB 991884)
• Connect the resistor harness (MB991884) to the harness
side of the driver’s seat belt pre-tensioner connector D-02
• Connect the (–) terminal of the battery
• After erasing the diagnosis code memory, reconfirm the
diagnosis code.
Is Code No.27 output?
SRS AIRBAGS – TROUBLESHOOTING
52B-17
Replace the SRS-ECU
Replace the driver’s seat belt pre-tensioner
Check connectors: C-124, D-02, C-116
Check the harness between the driver’s seat belt
pre-tensioner and the SRS-ECU, and repair.
Confirm the fault symptoms
Code No. 27 Driver’s seat belt pre-tensioner (squib) system
Possible cause
seat belt pre-tensioner (squib) circuit of the SRS-ECU.
When normal operation is resumed, the SRS warning light goes out.
(The diagnosis code is not erased.)
• Connector contact fault
• Disconnection in the driver’s seat belt pre-
tensioner (squib) circuit
• SRS-ECU fault
Dummy resistor
(MB991865)
Resistance (3Ω)
Resistor harness
(MB991884)
D-02 Driver’s seat belt pre-tensioner
connector harness side
(Checking the circuit between the SRS-ECU and the
driver’s seat belt pre-tensioner)
Measure at the SRS-ECU connector C-124 and driver’s seat
belt pre-tensioner connector D-02
• Detach the SRS-ECU connector C-124 and measure at
harness side
• Detach the driver’s seat belt pre-tensioner connector D-02
(see p.52B-34), and connect the resistor harness
(MB991884) to the harness side.
• Check connectivity between the following terminals.
C-124 connector
Resistor harness Connector
29
1
30
2
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: Connectivity (2Ω max.)
C-124 connector
Resistor
harness
connector
NO
OK
NG
NG
Repair
YES
OK
NG
SRS AIRBAGS – TROUBLESHOOTING
52B-18
Remarks:
* The connector of the squib circuit contains a short bar (which shorts the (+) cable to the (–) cable of the squib circuit when
the connector is not connected, in order to avoid erroneous deployment due to static electricity, or the like). Therefore, when
a connector is connected, the short bar may not be released if there is a fault in the connector fitting or a malfunction in the
connector itself, as illustrated below. Before proceeding to the troubleshooting steps on the next page, disconnect the
connector as shown below, and then reconnect it. If no diagnosis code is output, then it can be assumed that the code was
previously output due to poor fitting of the connector.
Code No. 28 Front passenger’s seat belt pre-tensioner (squib) system
Possible cause
This code is output when shorting occurs between the terminals of the front
passenger’s seat belt pre-tensioner (squib) circuit of the SRS-ECU.
When normal operation is resumed, the SRS warning light goes out. (The
diagnosis code is not erased.)
• Fault in the connector fitting or fault in the short
bar*
• Shorting between the terminals of the front
passenger’s seat belt pre-tensioner (squib)
circuit
• Connector fault
• SRS-ECU fault
Front passenger seat
belt pre-tensioner
(Checking the front passenger’s seat belt pre-tensioner
(squib))
MUT-II/III diagnosis code
• Detach the (–) terminal of the battery
• Detach the front passenger’s seat belt pre-tensioner
connector D-14 (see p.52B-34)
• Connect the dummy resistor (MB991865) to the resistor
harness (MB 991884)
• Connect the resistor harness (MB991884) to the harness
side of the front passenger’s seat belt pre-tensioner
connector D-14
• Connect the (–) terminal of the battery
• After erasing the diagnosis code memory, reconfirm the
diagnosis code.
Is Code No.28 output?
SRS AIRBAGS – TROUBLESHOOTING
52B-19
(Checking the circuit between the SRS-ECU and the
front passenger’s seat belt pre-tensioner)
Measure at the SRS-ECU connector C-124
• Detach the SRS-ECU connector C-124
• Detach the front passenger’s seat belt pre-tensioner
connector D-14 (see p.52B-34)
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 27, 28 of the SRS-ECU connector (harness
side) C-124. 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 27 and 28
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
Replace the SRS-ECU
Replace the front passenger’s seat belt pre-tensioner
Check connectors: C-124, D-14, C-29
Check the harness between the front passenger’s seat
belt pre-tensioner and the SRS-ECU, and repair.
Confirm the symptoms
Dummy resistor
(MB991865)
Resistance (3Ω)
Resistor harness
(MB991884)
D-14 Front passenger’s seat belt
pre-tensioner connector
Harness side
C-124 connector
YES
OK
OK
NG
NG
Repair
NG
Fig. A
C-124 SRS-ECU connector
(harness side) Front view
Terminal Cable
band,
etc.
Section
A-A
At least 4mm
Short bar
NO
(Checking the front passenger’s seat belt pre-tensioner
(squib))
MUT-II/III diagnosis code
• Detach the (–) terminal of the battery
• Detach the front passenger’s seat belt pre-tensioner
connector D-14 (see p.52B-34)
• Connect the dummy resistor (MB991865) to the resistor
harness (MB 991884)
• Connect the resistor harness (MB991884) to the harness
side of the front passenger’s seat belt pre-tensioner
connector D-14
• Connect the (–) terminal of the battery
• After erasing the diagnosis code memory, reconfirm the
diagnosis code.
• Is Code No.29 output?
SRS AIRBAGS – TROUBLESHOOTING
52B-20
Replace the front passenger’s seat belt pre-tensioner
Check connectors: C-124, D-02, C-116
Check the harness between the front passenger’s
seat belt pre-tensioner and the SRS-ECU, and
repair.
Replace the SRS-ECU
Confirm the fault symptoms
Code No. 29 Front passenger’s seat belt pre-tensioner (squib) system
Possible cause
This code is output when there is a disconnection in the front passenger’s
seat belt pre-tensioner (squib) circuit of the SRS-ECU.
When normal operation is resumed, the SRS warning light goes out. (The
diagnosis code is not erased.)
• Disconnection in the driver’s seat belt pre-
tensioner (squib) circuit
• Connector contact fault
• SRS-ECU fault
Dummy resistor (MB991865)
Resistance (3Ω))
Resistor harness
(MB991884)
D-14 Front passenger’s seat belt
pre-tensioner connector
harness side
(Checking the circuit between the SRS-ECU and the front
passenger’s seat belt pre-tensioner)
Measure at the SRS-ECU connector C-124 and front
passenger’s seat belt pre-tensioner connector D-14
• Detach the SRS-ECU connector C-124 and measure at
harness side
• Detach the front passenger’s seat belt pre-tensioner
connector D-14 (see p.52B-34), and connect the resistor
harness (MB991884) to the harness side.
• Check connectivity between the following terminals.
C-124 connector
Resistor harness Connector
27
2
28
1
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: Connectivity (2Ω max.)
C-124 connector
Resistor
harness
connector
NG
Repair
OK
OK
NG
YES
OK
NO
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