Mitsubishi Lancer Evolution VI. Manual — part 91
SRS –
Troubleshooting
52B-10
Code No.34 Connector lock system
Probable cause
This diagnosis code is output if a poor connection of the SRS-ECU is detected. However,
if the vehicle condition returns to normal, diagnosis code No.34 will be automatically
erased, and the SRS warning lamp will switch off.
D
Malfunction of connectors
D
Malfunction of SRS-ECU
Is B51 SRS-ECU connector correctly connected?
Yes
No
Repair
Check the following connector:
B-51
OK
Replace the SRS-ECU.
Replace
NG
Code No.35 SRS-ECU (deployed air bag) system
Probable cause
This diagnosis code is output after the air bag deploys. If this code is output before
the air bag has deployed, the cause is probably a malfunction inside the SRS-ECU.
D
Malfunction of SRS-ECU
Replace the SRS-ECU.
Code No.41 IG
1
(A) power circuit system
Probable cause
This diagnosis code is output if the voltage between the IG
1
(A) terminal and the
earth is lower than the specified value for a continuous period of 5 seconds or more.
However, if the vehicle condition returns to normal, diagnosis code No.41 will be
automatically erased, and the SRS warning lamp will switch off.
D
Malfunction of wiring harnesses or connectors
D
Malfunction of SRS-ECU
Measure at SRS check harness
connector (5).
D
Disconnect SRS-ECU
connector B-51.
D
Connect SRS check
harness connector (3).
D
Continuity between
terminals (20)
OK: Continuity
NG
Check the following
connectors:
B-51, B-78, B-80
NG
Repair
OK
Check trouble symptoms.
NG
Check the harness wire between the SRS-ECU and earth, and
repair if necessary.
OK
Measure at SRS check harness connector (5).
D
Disconnect SRS-ECU connector B-51.
D
Connect SRS check harness connector (3).
D
Ignition switch: ON
D
Voltage between terminal (14) and body earth
OK: 9 V or more
NG
Check the following
connectors:
B-51, B-78
NG
Repair
OK
Check trouble symptoms.
NG
Check the harness wire between the SRS-ECU and ignition switch
IG
1
, and repair if necessary.
OK
Replace the SRS-ECU.
SRS check harness
(MB991613)
3
5
SRS –
Troubleshooting
52B-11
Code No.42 IG
1
(B) power circuit system
Probable cause
This diagnosis code is output if the voltage between the IG
1
(B) terminal and the
earth is lower than the specified value for a continuous period of 5 seconds or more.
However, if the vehicle condition returns to normal, diagnosis code No.42 will be
automatically erased, and the SRS warning lamp will switch off.
D
Malfunction of wiring harnesses or connectors
NG
Check the harness wire between the SRS-ECU and ignition switch
IG
1
, and repair if necessary.
OK
Check trouble symptoms.
OK
Replace the SRS-ECU.
OK
Measure at SRS check harness connector (5).
D
Disconnect SRS-ECU connector B-51.
D
Connect SRS check harness connector (3).
D
Ignition switch: ON
D
Voltage between terminal (13) and body earth
OK: 9 V or more
NG
Check the following
connectors:
B-51, B-78
NG
Repair
NG
Check the harness wire between the SRS-ECU and earth, and
repair if necessary.
OK
Check trouble symptoms.
Measure at SRS check harness
connector (5).
D
Disconnect SRS-ECU
connector B-51.
D
Connect SRS check
harness connector (3).
D
Continuity between
terminals (20)
OK: Continuity
NG
Check the following
connectors:
B-51, B-78, B-80
NG
Repair
SRS check harness
(MB991613)
3
5
SRS –
Troubleshooting
52B-12
Code No.43 SRS warning lamp drive circuit system
(Lamp does not illuminate.)
Probable cause
This diagnosis code is output when an open circuit occurs for a continuous period
of 5 seconds while the SRS-ECU in monitoring the SRS warning lamp and the lamp
is OFF (transistor OFF).
However, if this code is output due to an open circuit, if the vehicle condition returns
to normal, this diagnosis code No.43 will be automatically erased, and the SRS warning
lamp will return to normal.
D
Malfunction of wiring harnesses or connectors
D
Blown bulb
D
Malfunction of SRS-ECU
D
Malfunction of combination meter
OK
Replace the combination
meter.
NG
Check the harness wire
between the SRS-ECU
and ignition switch (IG
1
).
NG
Repair
OK
Check trouble symptoms.
OK
Check the following
connectors:
B-51, B-09, B-08, B-75,
B-76
NG
Repair
NG
Check the harness wire between the SRS-ECU and earth, and
repair if necessary.
OK
Check trouble symptoms.
Measure at SRS check harness
connector (5).
D
Disconnect SRS-ECU
connector B-51.
D
Connect SRS check
harness connector (3).
D
Continuity between
terminals (20)
OK: Continuity
NG
Check the following
connectors:
B-51, B-78, B-80
NG
Repair
OK
Measure at SRS check harness connector (5).
D
Disconnect SRS-ECU connector B-51.
D
Connect SRS check harness connector (3).
D
Ignition switch: ON
D
Connect terminal (15) to the body earth.
OK: Lamp illuminates
NG
Blown bulb inspection
NG
Repair
OK
Replace the SRS-ECU.
SRS check harness
(MB991613)
3
5
Code No.43 SRS warning lamp drive circuit system
(Lamp does not switch off.)
Probable cause
This diagnosis code is output when a short to earth occurs in the harness between
the lamp and the SRS-ECU while SRS-ECU is monitoring the SRS warning lamp
and the lamp is ON.
D
Malfunction of wiring harnesses or connectors
D
Malfunction of SRS-ECU
D
Malfunction of combination meter
SRS warning lamp inspection
D
Ignition switch: ON
D
Does lamp switch off when SRS-ECU connector B-51 is
disconnected?
No
Check the following
connectors:
B-51, B-09
NG
Repair
Yes
Replace the SRS-ECU.
OK
Check trouble symptoms.
NG
Check the harness wire
between the SRS-ECU
and combination meter,
and repair if necessary.
SRS –
Troubleshooting
52B-13
Code No.44 SRS warning lamp drive circuit system
Probable cause
This diagnosis code is output when a short occurs in the lamp drive circuit or a
malfunction of the output transistor inside the SRS-ECU is detected while the SRS-ECU
is monitoring the SRS warning lamp drive circuit.
D
Malfunction of wiring harnesses or connectors
D
Malfunction of SRS-ECU
Check the SRS warning lamp drive circuit system.
(Refer to P.52B-12)
OK
Replace the SRS-ECU.
Code No.45 SRS-ECU non-volatile memory (EEPROM)
and A/D converter system
Probable cause
This diagnosis code is output if there is a malfunction in the SRS-ECU non-volatile
memory (EEPROM) and A/D converter.
D
Malfunction of SRS-ECU
Code No.
Trouble symptom
45
Non-volatile memory
(EEPROM)
D
Non-volatile memory (EEPROM) is abnormal.
Replace the SRS-ECU.
Code No.51 or 52 Driver’s side air bag module (squib
ignition drive circuit) system
Probable cause
This diagnosis code is output if a short (No.51) or an open circuit (No.52) is detected
in the circuit for the driver’s seat.
D
Malfunction of SRS-ECU
Code No.
Trouble symptom
51
Driver’s side air bag module
(squib ignition drive circuit)
D
Short circuit in the squib ignition drive circuit
52
(squib ignition drive circuit)
D
Open circuit in the squib ignition drive circuit
Replace the SRS-ECU.
Code No.54 or 55 Front passenger’s side air bag module
(squib ignition drive circuit) system
Probable cause
This diagnosis code is output if a short (No.54) or an open circuit (No.55) is detected
in the circuit for the passenger’s seat.
D
Malfunction of SRS-ECU
Code No.
Trouble symptom
54
Front passenger’s side air
bag module (squib ignition
D
Short circuit in the squib ignition drive circuit
55
bag module (squib ignition
drive circuit)
D
Open circuit in the squib ignition drive circuit
Replace the SRS-ECU.
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