Mitsubishi Lancer Evolution 7. Manual — part 363
SRS -
Troubleshooting
52B-17
<RS>
<Check the circuit between the SRS-ECU and clock
spring>
Measure at the SRS-ECU connector C-21 and the clock
spring connector C-204.
D
Disconnect the SRS-ECU connector C-21 and the clock
spring connector C-204 and measure at the harness side.
D
Continuity check between the following terminals
Connector C-21
Connector C-204
11
–
2
12
–
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)
NG
Correct
Check connector: C-21, C-204
OK
Check the trouble
symptoms.
NG
Check the harness between the clock spring and the
SRS-ECU, and repair if necessary.
NG
Connector C-21
Connector C-204
<Clock spring check>
MUT-II self-diag code
D
Release the clock spring connector (2-pin) C-204.
D
Connect the dummy resistor (MB991865) to the resistor harness
(MB991866).
D
Insert the resistor harness
(MB991866) behind the harness side connector C-204.
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.22 output?
YES
Check the clock spring (Refer to P.52B-59.)
NO
YES
Replace the clock spring.
Replace the driver’s air bag module
(squib).
NO
Replace the SRS-ECU.
OK
Resistor harness
(MB991866)
Clock spring harness
side connector C-204
Dummy resistor
(MB991865)
resistance (3Ω)
SRS -
Troubleshooting
52B-18
<RS-II>
<Driver’s seat air bag module (squib) check>
MUT-II self-diag code
D
Disconnect the clock spring connector No.1 (connector connected with
the air bag module).
D
Connect the dummy resistor (MB991865) to the resistor harness
(MB991866).
D
Insert the resistor harness (MB991866) behind the clock spring
connector No.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.
D
Connect the negative (-) terminal of the battery
D
Check the diagnosis code again after erasing the memory.
Is code No.22 output?
Dummy resistor
(MB991865)
resistance (3Ω)
1
YES
NO
Replace the steering wheel-driver’s air bag module assembly.
Resistor harness
(MB991866)
Go to Next Page
<Clock spring check>
MUT-II self-diag code
D
Release the clock spring connector (2-pin) C-204.
D
Connect the dummy resistor (MB991865) to the resistor harness
(MB991866).
D
Insert the resistor harness
(MB991866) behind the harness side connector C-204.
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.22 output?
YES
Replace the clock spring.
NO
Resistor harness
(MB991866)
C-204 clock spring
harness side connector
Dummy resistor
(MB991865)
resistance (3Ω)
SRS -
Troubleshooting
52B-19
<Check the circuit between the SRS-ECU and clock
spring>
Measure at the C-21 SRS-ECU connector and C-204 clock
spring connector.
D
Disconnect the SRS-ECU connector C-21 and the clock
spring connector C-204 and measure at the harness side.
D
Continuity check between the following terminals
C-21 connector
C-204 connector
11
–
2
12
–
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)
NG
Correct
Check connector: C-21, C-204
OK
Check the trouble
symptoms.
NG
Check the harness between the clock spring and the
SRS-ECU, and repair if necessary.
YES
From Previous Page
NG
Connector C-21
Connector C-204
Replace the SRS-ECU.
OK
SRS -
Troubleshooting
52B-20
Code No.24 Front passenger’s air bag module (squib)
system
Possible Cause
This code is output when short circuit occurs between terminals of 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
Connector engagement faulty or short bar faulty*
D
Short circuit between terminals of the front
passenger’s air bag (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-21
SRS-ECU
C-109
Front passenger’s air bag module
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