Mitsubishi Galant (2004+). Manual - part 1450

IGNITION SWITCH

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CHASSIS ELECTRICAL

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8. Enter the vehicle’s password (secret code) on the "Key 

registration" screen, and then click the check mark icon. 
Follow the prompts on the screen to insert key(s) into the 
ignition switch to begin key registration.

9. If the key ID was registered successfully, "Progress" 

indication will turn active (gray). Then the registration 
process completes. If the key ID failed to be registered, 
"In-Complete" indication will turn active (gray).

10.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. Key ID 
registration screen will be displayed, then register another 
key.
NOTE: A maximum of eight different keys can be registered.

11.This completes the registration operation. Turn the ignition 

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

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

ignition keys.

13.Check that the immobilizer system DTC and MFI system 

DTC did not set.

14.If not DTC is shown, terminate the scan tool MB991958.
15.Turn the ignition switch to "LOCK" (OFF) position.
16.Disconnect scan tool MB991958.

.

Registration of additional keys with the scan tool
Additional key(s) can be registered with the scan tool while 
keeping all existing key data.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to "LOCK" (OFF) position before connect-
ing or disconnecting scan tool MB991958.
NOTE: To register additional keys with the scan tool, no regis-
tered keys must be lost.

POWERTRAIN

IMMOBILIZER

Special Function

7

8

9

4

5

6

1

2

3

0

Back

Back

Space

Space

Clear

Clear

Key registration

AC207300

AC

POWERTRAIN

IMMOBILIZER

Special Function

IMMOBILIZER-ECU registration

Progress

In-Complete

Key registration

AC207302

AC

IGNITION SWITCH

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1. Connect scan tool MB991958 to the 16-pin data link 

connector.

2. Turn the ignition switch to "ON" position.

NOTE: Before registration, check that no DTC code is set. If 
a DTC code is set, resolve the problem beforehand.

3. Carry out steps 3 to 6 of the sub-section "Registration with 

scan tool."

4. Choose "Transponder ID addition" from "Special Function" 

screen.

5. Enter the vehicles password (secret code) on the 

"Transponder ID addition" screen, and then click the check 
mark icon.

6. If an additional registration is made successfully, the screen 

will ask if another key is registered or not. If the third ignition 
key is registered, remove the key, which has been 
registered. Then insert the third key within five seconds, and 
then turn it to the ON position.

7. Register the additional ignition key according to step 6 

above. The number of the registered ignition keys are 
shown on "The number of registered key" screen.
NOTE: A maximum of eight different keys can be registered.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

Key registration

Transponder ID 

addition

POWERTRAIN

Special Function

IMMOBILIZER

Special Function

AC207299

AF

key registration

Transponder ID

addition

POWERTRAIN

IMMOBILIZER

Password

Special Function

7

8

9

4

5

6

1

2

3

0

Back

Back

Space

Space

Clear

Clear

Trasponder ID addition

AC207301

AC

AC207301

AC209775

POWERTRAIN

IMMOBILIZER

Key ID register

The number of registered key

The number of registered key

3

Progre

Special Function

Trasponder ID addition

About Additional Transponder
ID SET

If register another key ID, press the

If register another key ID, press the
OK button after inserting a new key

OK button after inserting a new key
within 5 sec and turning on IG-SW

within 5 sec and turning on IG-SW.

AD

IGNITION SWITCH

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8. This completes the registration operation. Turn the ignition 

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

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

ignition keys.

10.Check that the immobilizer system DTC and MFI system 

DTC did not set.

11.If not DTC is shown, terminate the scan tool MB991958.
12.Turn the ignition switch to "LOCK" (OFF) position.
13.Disconnect scan tool MB991958.

.

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. Remove the first registered key (key A).
3. Insert the second registered ignition key (key B), and turn it 

to the ON position.

4. After approximately 10 seconds the immobilizer indicator will 

start blinking, and then additional registration mode is 
entered.

5. Check the immobilizer indicator starts blinking, and then 

remove the second registered key (key B).

6. Insert the third ignition key, and turn it to the ON position.

AC307460

AB

IMMOBILIZER INDICATOR LIGHT

IGNITION SWITCH

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

reject it, and operates the immobilizer indicator (See the 
table below). 

8. If a new ignition key is registered further, repeat steps 1 to 7 

above.

A maximum of eight ignition keys can be registered to one vehi-
cle (If you attempt to register the ninth key, the immobi-
lizer-ECU rejects the key). If any of the following conditions are 
satisfied, the additional key registration mode will terminate:

• The immobilizer indicator starts blinking 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.

TRANSPONDER LOCK CHECK

M1543024100131

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness A (Vehicles with CAN 

communication system)

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to "LOCK" (OFF) position before connect-
ing or disconnecting scan tool MB991958.
Follow the procedure below to judge if the ignition key can be 
overwritten (i.e. the ignition key is correct) or not.

The new key is:

Registration is:

Immobilizer indicator: 

Operation

Timing

Not registered yet

Accepted

Illuminates for 
three seconds

In approximately three seconds after 
the ignition key(s) have been 
registered

Already registered

Rejected

Illuminates for 
three seconds

In approximately three seconds after 
the ECU judges that the keys have 
been registered

Read error

Rejected

Extinguished

After the ECU detects a read error