Mitsubishi L200. Manual - part 536

KEYLESS ENTRY SYSTEM

BODY

42-204

TROUBLE SYMPTOM CHART

M1428001800113

Symptom

Inspection 
procedure 
number

Reference 
page

Keyless entry system does not work at all.

A-1

P.42-204

Keyless entry hazard lamp answerback function or the room lamp 
answerback function does not work normally.

A-2

P.42-206

Encrypted code cannot be registered.

A-3

P.42-207

The timer lock function does not work after the doors have been unlocked by 
the keyless entry system.

A-4

P.42-208

INPUT SIGNAL CHART

M1428004800059

Symptom

Inspection 
procedure 
number

Reference 
page

Each button signal of the keyless entry transmitter is not received.

B-1

P.42-209

The key reminder switch signal is not received.

B-2

P.42-210

SYMPTOM PROCEDURES

Inspection Procedure A-1: Keyless Entry System does not Work at all.

CAUTION

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

ETACS-ECU

INPUT SIGNAL

· ALL OF THE DOOR SWITCHES
· DRIVER'S DOOR LOCK ACTUATOR SWITCH
· KEYLESS ENTRY TRANSMITTER BUTTON
· KEY REMINDER SWITCH

KEYLESS ENTRY
RECEIVER

AC312995

Keyless Entry System Function Circuit

AB

COMMENTS ON TROUBLE SYMPTOM
If the keyless entry system does not work normally, 
the input signal circuits to the components below or 

the ETACS-ECU may be defective.

• Key reminder switch

• All of the door switches

KEYLESS ENTRY SYSTEM

BODY

42-205

• Transmitter

• Driver's door lock actuator

PROBABLE CAUSES

• Malfunction of the key reminder switch

• Malfunction of the door switches

• Malfunction of the transmitter

• Malfunction of the driver's door lock actuator

• 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.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to 

P.42-64

.

STEP 2. Check the power supply circuit.
When the ignition switch is turned to the LOCK 
(OFF) position, check if the hazard warning lamp illu-
minate.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Refer to GROUP 54A, Inspection Procedure 
A-1 "Check the battery power supply circuit 
to the ETACS-ECU ."

STEP 3. M.U.T.-III data list
Check the input signals from the drive’s door switch, 
the passenger’s switch and the rear door switch 
<Double cab>.

• Drive’s door: Close

• Passenger’s door: Close

•

Item 
No.

Item name

Normal condition

19

Driver's door switch

OFF

48

Passenger’s door 
switch

OFF

49

Rear door switch

OFF

Rear door <Double cab>: Close

OK: Normal conditions are displayed for all 
the items.

Q: Are the check result normal?

YES : 

Go to Step 4.

NO (The door switches signal are not received.) : 

Refer to GROUP 54A, Inspection Procedure 
C-5 "One of the switch signals is not 
received ."

STEP 4. Pulse check
Check the input signals below which are related to 
the encrypted code of the keyless entry transmitter.

System switch

Check condition

Transmitter button

When the button is 
turned from off to on

Key reminder switch

When the inserted 
ignition key is pulled out

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

Q: Are the check result normal?

YES : 

Go to Step 5.

NO (The keyless entry transmitter button signal is 
not received.) : 

Refer to 

P.42-209

.

NO (The key reminder switch signal is not 
received.) : 

Refer to 

P.42-210

.

STEP 5. Retest the system.
Check that the keyless entry system works normally.

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 and register the 
ID codes (Refer to GROUP 54A, How to 
Register Encrypted Code ).

KEYLESS ENTRY SYSTEM

BODY

42-206

Inspection Procedure A-2: Keyless Entry Hazard Lamp Answerback Function or the Room Lamp 
Answerback 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 hazard warning lamp and the room lamp work 
normally, the ETACS-ECU may be defective.
Alternatively, it is possible that the keyless entry haz-
ard lamp answerback function was disabled by the 
customise function.

PROBABLE CAUSES

• Defective hazard warning lamp

• Malfunction of the room lamp

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the operation of the hazard 
warning lamp.
Check that the hazard warning lamp illuminate nor-
mally.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to GROUP 54A, Inspection Procedure 
1 "The hazard warning lamp do not 
illuminate ".

STEP 2. Check the operation of the room lamp.
Check that the room lamp illuminate normally.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Refer to GROUP 54A, Check Chart for 
Trouble Symptoms .

STEP 3. Check the operation of the keyless entry 
system.
If the keyless entry system is operated, check that 
the doors can be locked and unlocked normally.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Refer to 

P.42-204

.

STEP 4. Check the customise function.
Using the customise function, check that the number 
of flashings of hazard warning lamp is set to any of 
the followings other than "LOCK: 0/UNLOCK: 0."

• LOCK:1/UNLOCK:2

• LOCK:1/UNLOCK:0

• LOCK:0/UNLOCK:2

• LOCK:2/UNLOCK:0

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Enable the keyless entry hazard lamp 
answerback function by using the customise 
function (Refer to 

P.42-244

).

STEP 5. Check the power supply circuit.
When the ignition switch is turned to the LOCK 
(OFF) position, check if the hazard warning lamp illu-
minate.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Refer to GROUP 54A, Inspection Procedure 
A-1 "Check The Battery Power Supply 
Circuit to The ETACS-ECU ."

STEP 6. Retest the system.
Check that the keyless entry hazard lamp answer-
back function or the room lamp answerback function 
works normally.

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 and register the 
ID codes (Refer to GROUP 54A, How to 
Register Encrypted Code ).

KEYLESS ENTRY SYSTEM

BODY

42-207

Inspection Procedure A-3: Encrypted Code cannot be Registered.

CAUTION

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

INPUT SIGNAL

ETACS-ECU

· HAZARD WARNING LAMP SWITCH
· KEYLESS ENTRY TRANSMITTER BUTTON
· KEY REMINDER SWITCH

AC313069

Encrypted Transmitter Code Register Mode

AC

· KEYLESS ENTRY TRANSMITTER BUTTON
· KEY REMINDER SWITCH

COMMENTS ON TROUBLE SYMPTOM
If the encrypted code registration mode is not 
entered, the key reminder switch or the ETACS-ECU 
may be defective.
If the registration is not possible although the regis-
tration mode is entered, the keyless entry transmitter 
or the ETACS-ECU may be defective.

POSSIBLE CAUSES

• Malfunction of the keyless entry transmitter

• Malfunction of the key reminder switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the encrypted code registration 
mode.
Check that the encrypted code registration mode is 
entered.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Go to Step 2.

STEP 2. Pulse check
Check the input signals below which are related to 
the encrypted code of the keyless entry transmitter.

System switch

Check condition

Transmitter button

When the button is 
turned from off to on

Key reminder switch

When the inserted 
ignition key is pulled out

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

Q: Is the check result normal?

YES : 

Go to Step 3.

NO (The keyless entry transmitter button signal is 
not received.) : 

Refer to 

P.42-209

.

NO (The key reminder switch signal is not 
received.) : 

Refer to 

P.42-210

.

STEP 3. Retest the system.
Check that the encrypted code can be registered.

Q: Is the check result normal?