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
Keyless entry hazard lamp answerback function or the room lamp
answerback function does not work normally.
A-2
Encrypted code cannot be registered.
A-3
The timer lock function does not work after the doors have been unlocked by
the keyless entry system.
A-4
INPUT SIGNAL CHART
M1428004800059
Symptom
Inspection
procedure
number
Reference
page
Each button signal of the keyless entry transmitter is not received.
B-1
The key reminder switch signal is not received.
B-2
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
.
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.) :
NO (The key reminder switch signal is not
received.) :
Refer to
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
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
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.) :
NO (The key reminder switch signal is not
received.) :
Refer to
STEP 3. Retest the system.
Check that the encrypted code can be registered.
Q: Is the check result normal?
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