Mitsubishi Montero (2002-2004). Manual - part 464

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54A-27

5. Select "Special Func," press "YES".

If DTC 11 exists, "Can't execute" will be displayed. Check for 
DTC 11. (Refer to 

P.54A-8

.)

6. Select "Add key ID reg," press "YES".

7. Press the "YES" key to start key ID registration.
8. This will be displayed when the add key ID registration is 

successful. If an error occurs during key ID registration, the 
message "Can't execute" will be displayed. If the key has 
already been registered, "Key ID has been registration" will 
be displayed.

9. The number of keys currently registered will be displayed. 

To register an additional key, replace the ignition key with 
the next key to be registered within five seconds and then 
press the "YES" key. Key ID registration screen will be 
displayed, then register another key.
If key ID registration is complete, press the "NO" key.
NOTE: A maximum of eight different keys can be registered.

AC000530

AB

AC000518

AB

AC101478

AC101477

AC101476

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54A-28

10.This completes the registration operation. Turn the ignition 

switch "LOCK" (OFF) and leave it off for approximately ten 
seconds.

11.Check that the engine can be started with each of the 

ignition keys.

12.Check that the immobilizer system DTC and MFI system 

DTC did not set.

13.Turn the ignition switch to "LOCK" (OFF) position.
14.Disconnect scan tool MB991502.

.

Registration of additional key(s) without using the scan 
tool
If the scan tool is not available, new key(s) can be registered by 
operating two keys which have been registered to the vehicle 
(A maximum of eight keys can be registered to one vehicle). 
Follow the procedure below to register new key(s) to the vehi-
cle.
NOTE: The registered key is the key that allows you to start the 
engine.
1. Turn on the ignition switch by using the first registered key 

(key A), and wait for five seconds.

2. Within 30 seconds, remove the key.
3. Within seven seconds after the ignition switch has been 

turned to the "LOCK" (OFF), insert the second registered 
key (key B) and turn on the ignition switch again. Now the 
theft-alarm indicator light should blink twice for one second. 
If it does not blink, you has failed to register. Repeat from 
step 1.

4. Turn on the key B. Within 30 seconds, remove the key.
5. Within seven seconds after the ignition switch has been 

turned to the "LOCK" (OFF) position, turn on the ignition 
switch by using a new key.

6. The immobilizer-ECU identifies the new key to accept or 

reject it, and operates the theft-alarm indicator (See the 
table below). 

The new key is:

Registration is:

Additional 
registration 
mode: 

Theft-alarm indicator: 

Not registered yet

Accepted

Continues

Comes on for 3 seconds after the ECU 
judges that the key has not been 
registered yet.

Already registered

Rejected

Continues

Comes on for 3 seconds after the ECU 
judges that the key has already been 
registered

Read error

Rejected

Continues

Blinks three times after the ECU has 
failed to identify the key.

Eight ignition keys have 
been registered

Rejected

Continues

Does not come on and blink

ACX02297

THEFT ALARM 

INDICATOR LIGHT

DEFROSTER NOZZLE

AC

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54A-29

7. A maximum of eight ignition keys can be registered to one 

vehicle (If you attempt to register the ninth key, the 
immobilizer-ECU rejects the key). Follow the procedure 
below to register another new key. 

(1) Within 30 seconds after the new key has been registered 

on step 6, remove the key.

(2) Within seven seconds after the ignition switch has been 

turned to the "LOCK" (OFF), insert another new key and 
turn on the ignition switch.

(3) To register more other ignition key(s), repeat steps 1 and 

2.

8. If any of the following conditions are satisfied, the additional 

key registration mode will terminate:

• The ignition switch has been on for more than 30 seconds.

• After the ignition key has been turned to the "LOCK" (OFF), 

the engine control relay is turned off.

• The scan tool has started communicating with vehicle sys-

tems.

9. After the registration mode has terminated, the additionally 

registered key(s) should allow you to start the engine.

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54A-30

IGNITION SWITCH

REMOVAL AND INSTALLATION

M1543002100155

ACX01372

1

2

3

4

5

6

7

8

ACX01568

AD

DIAGNOSIS CONNECTOR

9

AD

IGNITION SWITCH REMOVAL 
STEPS

1. STEERING WHEEL (REFER TO 

GROUP 37, STEERING WHEEL AND 
SHAFT 

P.37A-23

.)

2. INSTRUMENT UNDER COVER
3. COLUMN COVER LOWER
4. COLUMN COVER UPPER
5. COLUMN SWITCH

<<A>>

6. STEERING LOCK CYLINDER

7. IGNITION SWITCH
8. KEY REMINDER SWITCH

IMMOBILIZER-ECU REMOVAL 
STEPS

• LOWER CENTER PANEL <LH> 

(REFER TO GROUP 52A, FLOOR 
CONSOLE ASSEMBLY 

P.52A-7

.)

9. IMMOBILIZER-ECU

IGNITION SWITCH REMOVAL 
STEPS (Continued)