Mitsubishi Lancer Evolution IX. Manual — part 637
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-61
OPERATION
• Power for the SRS warning lamp is supplied from
the ignition switch (IG1) circuit.
• The SRS warning lamp illuminates when the igni-
tion switch is turned to the "ON" position and
goes out after approximately 7 seconds if there is
not a malfunction in the SRS system.
DIAGNOSIS CODE SET CONDITIONS
• This diagnosis code is set when an open circuit is
detected for a continuous period of 5 seconds
while the SRS-ECU is monitoring the SRS warn-
ing lamp and the lamp is OFF. (transistor OFF).
However, if the vehicle condition returns to nor-
mal, diagnosis code 43 will be automatically
erased, and the SRS warning lamp will go out.
PROBABLE CAUSES
• Damaged wiring harnesses of connectors
• Blown bulb
• Malfunction of the SRS-ECU
• Malfunction of the combination meter
DIAGNOSIS PROCEDURE
STEP 1. Check the SRS warning lamp.
(1) Disconnect the negative battery terminal.
(2) Disconnected the SRS-ECU connector C-12.
(3) Connect the negative battery terminal.
(4) Turn the ignition switch to the "ON" position.
Q: Does the warning lamp illuminate?
YES :
Go to Step 4.
NO :
Go to Step 2.
STEP 2. Check the SRS warning lamp bulb.
Q: Has the SRS warning lamp bulb blown?
YES :
Replace the SRS warning lamp bulb.
NO :
Go to Step 3.
AC101950AJ
SRS-ECU
Harness side
connector
(rear view)
C-12 (Y)
Connector: C-12
AC311044
SRS warning lamp
AB
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-62
STEP 3. Check the harness for open circuit
between ignition switch connector C-208
(terminal No.2) and combination meter C-01
(terminal No.9) and between combination meter
C-02 (terminal No.36) and SRS-ECU connector
C-12 (terminal No.8).
NOTE: After inspecting intermediate connectors
C-01, C-02, C-23 <LHD> or C-01, C-02 <RHD>
inspect the wiring harness. If intermediate connec-
tors C-01, C-02, C-23 <LHD> or C-01, C-02 <RHD>.
are damaged, repair or replace them.
Q: Is the check result normal?
YES :
Replace the combination meter (Refer to
GROUP 54A
− Combination Meters
Assembly
). Then go to Step 4.
NO :
Repair the harness wires between
SRS-ECU connector C-12 (terminal No.8)
and the ignition switch connector C-208
(terminal No.2).
AC303806
Connector: C-208
<LHD>
Harness side
connector
(front view)
AI
Clock spring
AC303820 AE
Connector: C-208
<RHD>
Harness side
connector
(front view)
Clock spring
AC303799
Connectors: C-01, C-02, C-23
AQ
C-01
<LHD>
C-01
Harness side
C-02 (L)
C-23 (B)
C-02
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
C-23
2
1
3
13
12
14
21
10
5
4
6
16
15
17
7 8 9
19
18
20
11
22
Harness side
AC303815
Connectors: C-01, C-02
AR
<RHD>
C-01
Harness side
C-02
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
C-01
C-02(L)
AC101950AJ
SRS-ECU
Harness side
connector
(rear view)
C-12 (Y)
Connector: C-12
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-63
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code 43 set?
YES :
Replace the SRS-ECU (Refer to
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00
− How to Use
Troubleshooting/Inspection Service Points
).
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-64
Code No.43: SRS warning lamp circuit open-circuited (Lamp does not Switch Off).
IGNITION
SWITCH (IG1)
MICROCOMPUTER
COMBINATION
METER
WARNING LAMP
DRIVE CIRCUIT
SRS-ECU
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet
SRS Warning Lamp Drive Circuit
CONNECTOR
LOCK SWITCH
NOTE
: CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF
: LH drive vehicles
: RH drive vehicles
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