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