Mitsubishi Lancer (4A9 engine). Manual - part 223

ETACS

CHASSIS ELECTRICAL

54A-554

Inspection Procedure 3: The key reminder switch signal is not received.

CAUTION

Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communica-
tion circuit are normal.

COMMENTS ON TROUBLE SYMPTOM
The key reminder switch input signal is used for the 
operation judgment of the functions below. If the sig-
nal is abnormal, these functions will not work.

• Central door locking

• Keyless entry system

ETACS-
ECU

KEY
REMINDER
SWITCH

WHEN REMOVING
KEY: ON

Key Reminder Switch Input Circuit

Wire colour code 
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue 
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple     SI : Silver

AC612708

Connector: C-213 <LHD>

AU

AC612716 AL

Connector: C-213 <RHD>

AC701240

AK

Connector: C-315 <LHD>

ETACS-ECU

AC701241

AK

Connector: C-315 <RHD>
ETACS-ECU

ETACS

CHASSIS ELECTRICAL

54A-555

• KOS

• Ignition key cylinder illumination lamp

• Room lamp

PROBABLE CAUSES

• Malfunction of the key reminder switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-213 key reminder 
switch connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Check the key reminder switch.
Check the key reminder switch. Refer to .

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the key reminder switch.

STEP 3. Resistance measurement at the C-213 
key reminder switch connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the C-213 key 

reminder switch connector terminal No. 2 and the 
body earth.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

STEP 4. Wiring harness check from C-213 key 
reminder switch connector terminal No. 2 to 
body earth
Check the earth wire for open circuit.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Repair the wiring harness.

STEP 5. Connector check: C-315 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

STEP 6. Wiring harness check between the C-213 
key reminder switch connector terminal No. 3 
and the C-315 ETACS-ECU connector terminal 
No. 13
Check the output line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

STEP 7. M.U.T.-III data list
Turn the ignition switch to the OFF (key inserted) 
position.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Replace the ETACS-ECU.

Item No.

Item name

Normal 
condition

Item 264

Handle lock switch

Key in

ETACS

CHASSIS ELECTRICAL

54A-556

Inspection Procedure 4: The front door lock actuator signal is not received. <LH drive vehicles>

CAUTION

Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communica-
tion circuit are normal.

COMMENTS ON TROUBLE SYMPTOM
The front door lock actuator (LH) input signal is used 
for the operation judgment of the functions below. If 
the signal is abnormal, these functions will not work 
normally.

• Central door locking

• KOS

• Keyless entry system

• Room lamp

Door Look Actuator Signal Input Circuit

ETACS-ECU

<VEHICLES FOR RUSSIA>

FRONT DOOR 
LOCK ACTUATOR 
(LH)

Wire colour code 
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue 
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple     SI : Silver

VEHICLES WITH KEYLESS ENTRY SYSTEM

:

VEHICLES WITHOUT KEYLESS ENTRY SYSTEM

:

NOTE

AC701240

AV

ETACS-ECU

Connector: C-301 <LHD>

AC612730

Connector: E-15 <LHD>

AF

E-15 (B)

ETACS

CHASSIS ELECTRICAL

54A-557

PROBABLE CAUSES

• Malfunction of the front door lock actuator (LH)

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1.Connector check: E-15 front door lock 
actuator (LH) connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Front door lock actuator (LH) check
Refer to GROUP 42A 

− Door .

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the front door lock actuator (LH).

STEP 3. Resistance measurement at the E-15 
front door lock actuator (LH) connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the E-15 front 

door lock actuator (LH) connector terminal No. 1 
and the body earth.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

STEP 4. Wiring harness check between the E-15 
front door lock actuator (LH) connector terminal 
No. 1 and the body earth
Check the earth wires for open circuit.
NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-125, and repair if neces-
sary.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Repair the wiring harness.

STEP 5. Connector check C-301 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

STEP 6. Wiring harness check between the E-15 
front door lock actuator (LH) connector terminal 
No. 2, 3 and the C-301 ETACS-ECU connector 
terminal No. 11, 22.
Check the input line for open circuit.
NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-126, and repair if neces-
sary.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

STEP 7. M.U.T.-III data list
Change the status of driver's door from unlocked to 
locked.

NOTE: *: Vehicles for RUSSIA

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Replace the ETACS-ECU.

Item No.

Item name

Normal 
condition

Item 270

*

Dr door lock switch Not lock 

→ 

Lock 

Item 271

Dr door unlock 
switch

Unlock 

→ Not 

Unlock