Mitsubishi Lancer Evolution IX. Manual - part 262

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-307

INSPECTION PROCEDURE L-15: Interior lamp loaded signal is not detected.

CAUTION

Whenever the ECU is replaced, ensure that the 

input signal circuit is normal.

IGNITION
SWITCH (IG1)

IGNITION
SWITCH (ACC)

COMBINATION
METER

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

KEEP RELAY

ETACS-ECU

INTERIOR LAMP CUT
BACK-UP CIRCUIT

POWER
SOURCE

LOAD
DETERMINATION
CIRCUIT

BATTERY

J/B SIDE

<LHD>

<RHD>

· LUGGAGE COMPARTMENT LAMP
· FRONT ROOM LAMP
· REAR ROOM LAMP

RELAY
BOX

Interior Lamp Automatic Shutdown Function Circuit

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-308

COMMENTS ON TROUBLE SYMPTOM

The interior lamp automatic shutdown function oper-
ates in accordance with the interior lamp loaded sig-
nal. If this signal is abnormal, the functions below will 
not work normally.

• Ignition key cylinder illumination lamp

• Room lamps

• Interior lamp automatic shutdown function

POSSIBLE CAUSES

• Malfunction of the ETACS-ECU

• Damaged wiring harness or connector(s)

DIAGNOSIS PROCEDURE

Step 1. ECU check by using the SWS monitor.
Check that the power supply and earth lines to the 
ETACS-ECU and the SWS communication lines are 
normal.

• Ignition switch: OFF

ECUS TO BE CHECKED

• ETACS ECU

OK: "OK" is displayed on the "ETACS ECU" 
menu.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to Inspection Procedure A-3 
"Communication with the ETACS-ECU is 
not possible 

P.54C-36

."

Step 2. Connector check: C-226 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

Step 3. Voltage measurement at the C-226 
ETACS-ECU connector

(1) Remove the ETACS-ECU, and measure at the 

junction block side.

AC310450

Connector: C-226

AB

Junction block side

Junction block (rear view)

<LHD>

AC310461

Junction block (rear view)

Connector: C-226

AB

<RHD>

Junction block side

AC310450

Connector: C-226

AB

Junction block side

Junction block (rear view)

<LHD>

AC310461

Junction block (rear view)

Connector: C-226

AB

<RHD>

Junction block side

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-309

(2) Turn the ignition switch to the ON position.

(3) Voltage between C-226 ETACS-ECU connector 

terminal No.8 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

Step 4. Check the wiring harness between C-226 
ETACS-ECU connector terminal No.8 and the 
ignition switch (IG1).

NOTE: 

Prior to the wiring harness inspection, check junction 
block connector C-211, and repair if necessary.

• Check the power supply line to the ignition switch 

(IG1) for open circuit.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction 

P.00-5

).

NO : 

Repair the wiring harness.

AC301541GU

Connector C-226
(Junction block side)

2019

7

13

17

18

1615 14

10

11

12

9 8

2

6 5

3

4

1

AC310450

Connector: C-226

AB

Junction block side

Junction block (rear view)

<LHD>

AC310461

Junction block (rear view)

Connector: C-226

AB

<RHD>

Junction block side

AC310448

Harness side

Junction block (front view)

Connector: C-211

AB

<LHD>

4

6 5

3

2

1

AC310458

Harness side

Junction block (front view)

Connector: C-211

AB

<RHD>

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-310

Step 5. Voltage measurement at the C-226 
ETACS-ECU connector

(1) Remove the ETACS-ECU, and measure at the 

junction block side.

(2) Turn the ignition switch to the ACC position.

(3) Voltage between C-226 ETACS-ECU connector 

terminal No.4 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 6.

Step 6. Check the wiring harness between C-226 
ETACS-ECU connector terminal No.4 and the 
ignition switch (ACC).

AC310450

Connector: C-226

AB

Junction block side

Junction block (rear view)

<LHD>

AC310461

Junction block (rear view)

Connector: C-226

AB

<RHD>

Junction block side

AC301541HB

Connector C-226
(Junction block side)

2019

7

13

17

18

1615 14

10

11

12

9 8

2

6 5

3

4

1

AC310450

Connector: C-226

AB

Junction block side

Junction block (rear view)

<LHD>

AC310461

Junction block (rear view)

Connector: C-226

AB

<RHD>

Junction block side