Mitsubishi Lancer Evolution 7. Manual — part 367
SRS -
Troubleshooting
52B-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.
D
Harness or connector fault
D
Bulb fault
D
SRS-ECU inoperable
D
Combination meter fault
NG
NG
NG
OK
NG
NG
OK
Check the trouble symptoms.
NG
Correct
Check the harness between the SRS-ECU, the combination
meter, and the ignition switch IG
1.
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.
D
Connect the negative (-) terminal of the battery
D
Ignition switch: ON
D
Does the lamp illuminate when the SRS-ECU connector C-21 is
disconnected?
OK: Lamp illuminates.
Check the bulb.
Replace the combination meter.
OK
Correct
Check 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.
D
Harnesses or connector fault
D
SRS-ECU inoperable
D
Combination meter fault
NO
OK
NG
NG
NG
Replace combination meter.
Check the SRS warning lamp.
D
Connect negative (–) battery
terminal.
D
Ignition switch: ON
D
Does lamp go out when
combination meter connector
C-02 is disconnected?
YES
Check 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 system
Probable 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.
D
Harnesses or connector fault
D
SRS-ECU inoperable
Check the SRS warning lamp drive circuit system.
(Refer to P.52B-33.)
OK
Replace the SRS-ECU.
SRS -
Troubleshooting
52B-34
Code No.61 Driver’s air bag module (squib) system
(short-circuited to power supply)
Possible Cause
Code No.62 Driver’s air bag module (squib) system
(short-circuited to earth)
This code is output when the input terminal of the SRS-ECU driver’s air bag
module (squib) is short-circuited to power supply (code No.61) or short-circuited
to earth (code No.62).
D
Clock spring fault
D
Harness or connector fault
D
The harness of the driver’s air bag module (squib)
is short-circuited to power supply (code No.61) or
short-circuited to earth (code No.62)
D
SRS-ECU inoperable
NOTE
Two different types of driver’s air bag modules by model are featured. Thus, two types of air bag module
by model are described in the following flowchart.
RS: Steering wheel and air bag module separate type
RS-II: Steering wheel and air bag module incorporate type
<RS>
<RS-II>
SRS -
Troubleshooting
52B-35
<RS>
<Check the circuit between the SRS-ECU and
clock spring>
Measure at the SRS-ECU connector C-21.
D
Disconnect the SRS-ECU connector C-21.
D
Disconnect the the clock spring connector
C-204.
D
Ignition switch:ON
D
Measure at the harness side
D
Voltage between terminal 11 or 12 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: 0 V
<Check the circuit between the SRS-ECU and
clock spring>
Measure at the SRS-ECU connector C-21.
D
Disconnect the SRS-ECU connector C-21.
D
Disconnect the clock spring connector C-204 .
D
Measure at the harness side
D
Continuity between terminal 11 or 12 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
<Check the clock spring and the driver’s air bag module (squib)>
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.61 or No.62 output?
YES (when No.62 is output)
YES (when No.61 is output)
NO
Check the clock spring (Refer to P.52B-59.)
NO
YES
Replace the clock spring.
Replace the driver’s air bag module
(squib).
Replace the SRS-ECU.
NG
Correct
Check connector: C-21, C-204
Check the trouble symptoms.
Check the harness between the
clock spring and the SRS-ECU, and
repair if necessary.
NG
OK
NG
OK
NG
Connector C-21
Connector C-21
Resistor harness
(MB991866)
C-204 clock spring
harness side connector
Dummy resistor
(MB991865)
resistance (3Ω)
Replace the SRS-
ECU.
OK
SRS -
Troubleshooting
52B-36
<RS-II>
<Driver’s 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.61 or No.62 output?
YES
NO
Replace the driver’s air bag module (squib).
<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.61 or No.62 output?
YES (when No.62 is output)
Go to Next Page
YES (when No.61 is output)
Resistor harness
(MB991866)
Dummy resistor
(MB991865)
resistance (3Ω)
1
NO
Replace the clock spring.
Resistor harness
(MB991866)
C-204 clock spring
harness side connector
Dummy resistor
(MB991865)
resistance (3Ω)
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