Mitsubishi Lancer Evolution IX. Manual - part 205

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-79

INSPECTION PROCEDURE C-3: The central door locking system can not be operated by means of the 
front passenger's door lock key cylinder.

CAUTION

Whenever the ECU is replaced, ensure that the 
input and output signal circuits are normal.

COMMENT ON TROUBLE SYMPTOM

If the central door locking system does not work by 
means of the front passenger's door lock key cylin-
der, the front passenger's door lock key cylinder or 
the ETACS-ECU may be defective.

POSSIBLE CAUSES

• Malfunction of the front passenger's door lock key 

cylinder

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the operation of the central door 
locking system.
Check that the central door locking system works 
normally by means of the driver's door lock key cylin-
der and inside lock knob.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to Inspection Procedure C-1 "Central 
door locking system does not work 

P.54C-59

 <LH drive vehicles>," or refer to 

Inspection Procedure C-1 "Central door 
locking system does not work 

P.54C-62

 

<RH drive vehicles>."

ETACS-ECU

INPUT SIGNAL

FRONT 
PASSENGER'S 
DOOR LOCK KEY
CYLINDER SWITCH

· DOOR LOCK ACTUATOR (FRONT: LH)
· DOOR LOCK ACTUATOR (FRONT: RH) 
· DOOR LOCK ACTUATOR (REAR: LH) 
· DOOR LOCK ACTUATOR (REAR: RH)

J/B SIDE

Central Door Lock (Front Passenger's Door Lock Key Cyilinder Switch) Circuit

DOOR
UNLOCK
RELAY

DOOR
LOCK
RELAY

1

FUSIBLE 
LINK

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-80

Step 2. ECU check on 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 3.

NO : 

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

P.54C-36

."

Step 3. Pulse check
Check the input signal from the front passenger’s 
door lock key cylinder switch.

OK: The M.U.T.-II/III sounds or the voltmeter 
needle fluctuates.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Refer to Inspection Procedure L-16 "The 
door lock key cylinder switch signal is not 
received 

P.54C-312

."

Step 4. Retest the system.
Check that the central door locking system works 
normally by means of the front passenger's door lock 
key cylinder.

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 : 

Replace the ETACS-ECU.

System switch

Check condition

Front passenger’s door 
lock key cylinder switch

Turn the key to the lock 
or unlock position

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-81

INSPECTION PROCEDURE C-4: The ignition key reminder function does not work normally.

CAUTION

Whenever the ECU is replaced, ensure that the 
input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM

If the key reminder function does not work normally, 
the input signal circuits below or the ETACS-ECU 
may be defective.

• Key reminder switch

• Driver’s door switch 

• Driver’s door lock actuator

POSSIBLE CAUSES

• Malfunction of the key reminder switch

• Malfunction of the driver’s door switch

• Malfunction of the driver’s door lock actuator

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. ECU check on 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

."

ETACS-ECU

DOOR
UNLOCK
RELAY

DOOR
LOCK
RELAY

1

FUSIBLE 
LINK

INPUT SIGNAL

· KEY REMINDER 
  SWITCH

· DRIVER'S DOOR 
  SWITCH

· DRIVER'S DOOR 
  LOCK ACTUCTOR 
  SWITCH

J/B SIDE

· DOOR LOCK ACTUATOR (FRONT: LH)
· DOOR LOCK ACTUATOR (FRONT: RH) 
· DOOR LOCK ACTUATOR (REAR: LH) 
· DOOR LOCK ACTUATOR (REAR: RH)

Ignition Key Reminder Function Circuit

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-82

Step 2. Confirm communication data by using the 
SWS monitor.
Check the SWS communication signals, which are 
related to the key reminder function.

<Selected item> ETACS ECU

• Driver's door: open

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Refer to Inspection Procedure L-3 "The door 
switch (front: LH) signal is not received 

P.54C-263

 <LH drive vehicles>, " or refer to 

Inspection Procedure L-3 "The door switch 
(front: RH) signal is not received 

P.54C-265

. 

<RH drive vehicles>"

Step 3. Pulse check
Check the input signals below which are related to 
the key reminder function.

OK: The M.U.T.-II/III sounds or the voltmeter 
needle fluctuates.

Q: Is the check result normal?

All the signals are received normally. : 

Go to Step 

4.

The key reminder switch signal is not received. : 

Refer to Inspection Procedure L-9 "The key 
reminder switch signal is not received 

P.54C-281

."

The driver's door lock actuator switch signal is not 
received. : 

Refer to Inspection Procedure L-12 

"The front door lock actuator (LH) signal is 
not received 

P.54C-296

 <LH drive 

vehicles>," or refer to Inspection Procedure 
L-12 "The front door lock actuator (RH) 
signal is not received 

P.54C-299

 <RH drive 

vehicles>."

Step 4. Retest the system.

Q: Does the ignition key reminder function work 

normally?
YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction 

P.00-5

).

NO : 

Replace the ETACS-ECU.

Item No.

Item name

Normal condition

Item 32

DR DOOR SW ON

System switch

Check condition

Key reminder switch When the inserted ignition 

key is pulled out

Driver's door lock 
actuator switch

When the driver's key 
cylinder or inside lock knob 
is unlocked or locked