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Immobilizer Remote Programming

Pelican Technical Article:

Immobilizer Remote Programming


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Applicable Models:

Porsche 993 Carrera (1995-98)
Porsche 993 Carrera 4 (1995-98)
Porsche 993 Carrera 4S (1996-98)
Porsche 993 Carrera S (1998)
Porsche 993 Targa (1996-98)
Porsche 993 Turbo (1996-97)

Performance Gain:

Immobilizer knowledge and reference.

Complementary Modification:


Immobilizer Remote Programming

I thought adding this information to the web site would be beneficial to everyone who may need to program additional remotes in the future.

The information is straight out of the 993 shop manual, the information starts in 1994 model year and with provisions for 95 and up and the RS model.

Tuning model '94 remote control units

Vehicles with Immobilizer M 530

As a result of tolerances in the ignition lock, it is not possible to define precisely the position at which the buzzer contact is closed by the ignition key.
Depending on the tolerances, the buzzer contact(S) in the ignition lock

- May be closed between position 0 and I (Fig A)


- between position I and II (Fig. B)

I = terminal X (windshield wiper on)
II = terminal 15 (ignition on)
III = terminal 50 (starter)

you can find the same x,15,50 symbols in the schematic section of the shop manual, which is helpful in understanding which wire is hot under what condition.

When the key is remove from the ignition lock, the buzzer contact is opened (switched off).  This signal is required for tuning the remote control units.

The position where the buzzer contact is operated can be located as follows.

Manual transmission vehicles:

The buzzer contact signal is transmitted via pin 12 in the 14-pin connector (passenger compartment wire harness, connector X4/1 under the left seat).

1.  Remove the left seat.  Do not unplug the connector; carefully remove the connector cover and connect a test lamp to pin 12 (red/black) and ground.  (What the German guys trying to say here is to connect a test light's alligator clip to a ground of the car and poke the sharp end at pin 12 wire)

2. Turn the key slowly from position 0 to positive II in the ignition lock and observe the position at which the test lamp lights up.

Tiptronic vehicles:

The buzzer contact signal can be observed on the LEDs of the selector indicator (speedometer instrument cluster).

1.  Turn the key slowly from position 0 to position II in the ignition lock.

2. Observe the position at which one of the LEDs of the selector indicator lights up.


Manual and Tiptronic vehicles:

Depending on the position of the buzzer contact, for tuning "programming the remote", the ignition key must be turned to 

- position I (windshield wipers on)


- the buzzer contact position (S) (See Fig. A and B above)

Fig A: buzzer contact(S) between position 0 and I.  For tuning, the key must be turned to position I (windshield wipers on).

Fig B: buzzer contact(S) between position I and II.  In this case, the key must be turned to the contact position (test lamp or selector indicator) for tuning.


If the buzzer contact is reached just before or directly at "ignition on":
...... tuning is not possible.  In this case contact Porsche, Dept.  VKG  (Don't ask me what this means, maybe someone can tell us)

Tiptronic vehicles:

Before tuning the remote control units, check the key position at which the buzzer contact is operated.  Then tune the units. 

Tuning the remote control units

The diagram shows the sequence of events. The time required is at least 43.5 minutes.

1.  Unlock the vehicle using the remote control unit and open the door.  Do not insert the key into the ignition local (the door of the vehicle may be open or closed.)

2.  Wait 3 minutes.  After this time, the immobilizer will prime itself.  In order to ensure that you comply with times given below, please use a stopwatch or alarm clock.  If necessary, write the times down.

When the instructions below require "switch ignition on and off", it is sufficient to turn the ignition key until the ignition is witched off.

3.  Now start the stopwatch and at the same time switch the ignition on.
Leave the ignition key turned to "ignition on".
Switching the ignition on starts a sequence of operations.  After 41.5 minutes (± 1 Min.), the system reaches the status "tuning of remote-control units."

4.  After 22.5 minutes (±2 Min.), the ignition must be switched off and on again.

5.  After a total time of 32.5 minutes (±2 min.), the ignition must again be switched off and on.
Then lift the windshield wipers off the windshield (to detect ignition key position I) 

6.  After a total time of 41.5 minutes (±1 Min.), perform the following sequence, starting with the ignition on:
-set wiper switch to stage 1
-ignition off
-ignition on
-ignition off
-remove key from ignition lock
-insert key into ignition lock and turn to pos. I or to buzzer contact (not "ignition on")
If the key is in the correct position, either the wipers much be switched on in pos. I or, in buzzer contact position, the test lamp or selector LED must light up.
-Remove key from ignition lock.

7.  After the key has been removed, you have a total time of 1 minute for tuning the remote control units.  During this 1 minute, you must tune one remote control after the other to the vehicle by pressing the pushbutton.  When tuning the units, you must point the unit with the button pressed towards the control unit for at least 5 seconds.

8.  The status "tuning of remote control units" is ended when:
-4 remote control units have been tuned
-a 5th remove control unit is operated within the minute
-one unit is operated twice
-the minute has elapsed.

Any remote control units already assigned to a vehicle which are not tuned during a tuning session lose their validity for the vehicle.

Emergency unlocking of the door using the key

The key should only be used for emergency unlocking in the event of a failure of the remote control unit.

1.  Hold the key in the unlocking position and open the door at the same time using the door handle.  The alarm is triggered immediately.

2.  It is not possible to deactuate the immobilizer or the alarm system.  The engine cannot be started.

3.  The door is locked again as soon as it is closed.  The central locking system remains in operation.

Tuning model '95 remote control units

Emergency unlocking of the door using the key

The key should only be used for emergency unlocking in the event of a failure of the remote control unit.
De-activation of immobilizer (with vehicle locked)

It is possible to switch off the acoustic alarm for 2 minutes so that the immobilizer may be de-activated by entering a four-digit code number specific to the vehicle.  The four digital code number (key card) is entered using the ignition key by a sequence of ignition on and off operations.  The time available for entering the number is determined by the number of ignition OFF-ON operations, starting with the left digital.  To enter "0", the ignition must be switched from off to on 10 times.

You must wait for the warning light to go on before entering the next digit.

1.  The door lock must be unlocked, locked and unlocked again in 5 sec.  The acoustic alarm is then interrupted after 1 second.

2.  Open the door within 10 seconds and switch the ignition on.  The warning light in the clock will then light up and go out again after 15 seconds.

3.  Switch the ignition off and on again within 5 seconds.  The warning light will light up and start to flash after 15 seconds.

4.  You must start the enter the code number within 5 seconds.

5.  Example: code number 1312

1 - ignition off-on
wait for warning light
3 = ignition off-on, off-on, off-on
wait for warning light
1 = ignition off-on
wait for warning light
2 = ignition off-on, off-on

6.  If the number is correct, the warning light will flash.  This is also the point at which tuning of the remote units can start.

After the warning light has flashed and the ignition has been switched on again, the engine can be started.

The immobilizer is deactivated and the alarm system and central locking system are unlocked.  If the warning light does not flash after the code number has been entered, steps 1-5 must be repeated.
Emergency deactivation does not deactivate the self-priming function of the immobilizer system.

Turning the remote control units:

A maximum of four remote control units may be assigned to a vehicle as the same time.  Additional remote control units must always be tuned to a vehicle together with the two units already assigned to it.  Before the code number is entered, the immobilizer must be primed but the alarm and the central locking systems must not be activated.  This status is reached 90 seconds after the ignition key has been removed or 3 minutes after the vehicle has been unlocked using the remote control unit if the ignition key is not turning in the lock.

Entry of the code number

1.  Switch the ignition on.  The warning light in the clock will go on and off again after 15 seconds.

2.  Follow the instructions in points 3 to 6.

3.  If you have reached the tuning status (point 6 warning light is flashing) the remote control units must be tuned within one minute.

4.  Press the pushbuttons of the remote control units until the LEDs of the alarm system in the doors flash (as an acknowledgment).  Operate all the remote control units one after the other.

5.  If no more remote control units are operated within 1 minute or the ignition is switched off, tuning is stopped. 

911 Carrera RS vehicles

As Carrera RS vehicles are not equipped with a central locking system, both doors must be locked and unlock using the key.

To deactivate the immobilizer, the remote control unit must be operated twice in the following situation.  The immobilizer has self-primed and the ignition has not been switched on.

If the ignition is switched on before operating the remote control unit or the remote control unit is used to activate the immobilizer, the remote control unit must only be operated once.

The procedure for tuning remote control units is the same as for the 911 Carrera (993) from model '95.

Comments and Suggestions:
doctors Comments: Morning, Yesterday we did a quick video on how to program the Porsche 911 993 keyless entry remotes.

Let me know what you think.
February 6, 2018
  Followup from the Pelican Staff: Thanks for sharing. - Nick at Pelican Parts  
armand Comments: I own a 1995 993 cabriolet with manual transmission. Never had a problem with the immobilizer until this past week. I don't drive this car often. I noticed the problem the first time when I found the driver's door locked after parking it in the garage. The remote did not unlock the door so I had to reach inside and open the door manually. I replaced the battery in the remote and fully charged the car battery to make sure these were not an issue. No change. I also noticed that the interior dome light and trunk light were no longer illuminating when open. I can start the engine and drive the car fine, but I cannot lock the doors using the center console switch. I am able to lock and unlock the doors using the key. What can I do?
June 13, 2017
  Followup from the Pelican Staff: I don't think immobilizer is your issue. Sounds like an issue with the central locking system. I would check the module function, power, ground and inputs from the switch and key. If the module is going offline, the inputs to lock or unlock the vehicle will not work. - Nick at Pelican Parts  
toot Comments: Don't have a working key fob, attempting to program new one with the emergency unlocking of the door with key. When I get to step 3 the warning light comes on but doesn't flash. The alarm and immobilizer system were in fine working order prior to the key fob getting destroyed. With the system activated I get a steady single flashing from the door LED another words no double flashing. Your input will be much appreciated.
May 29, 2017
  Followup from the Pelican Staff: What year and model vehicle are you working on? - Nick at Pelican Parts  
Peter Comments: I have a beautiful 19907 993 Porsche, however according to the instruction manual when I lock and unlock the car the indicator lights should flash on and off, though do not do so. Also the small LED lights on the inside at the top of the doors do not flash as they should. I'm wondering if this is a simple fix? The clock on the dashboard is not working but the various lights and indicators on it seem to be working fine again is this an easy fix?
Are the above problems related?

Regards Peter White 0418 385 528 or email
I currently reside in Melbourne Victoria Australia
December 16, 2016
  Followup from the Pelican Staff: There may be a fault in the system. Usually the door lights will blink to notify you of this. Is there an aftermarket alarm or radio installed? if so, the wiring may be incorrect. - Nick at Pelican Parts  
Marc Comments: Hello, I have a 993 from oct 1993, one of the first produced, with a 3.8 ltr factory motorsport engine, and I'm trying to program my second key fob. I found the connector X4/1 under the driver seat but mine is a 12 pin and not a 14 pin one. I’m pretty sure I have the right one. I tried the contact on the same pin indicated on the diagram, second from the left first being empty and I get the light for S on my current tester...directly on ignition. I love my car :- Am I on the right pin or even the right connector for a 93 ? There is the two connectors and the 3rd at a slight angle so it looks like the same. I've tried all the procedures and nothing works and I don't have the light in the clock. Any one have any Ideas? Thanks.
December 12, 2016
  Followup from the Pelican Staff: I am not 100% sure. I don't have the wiring for your vehicle to compare it to. I would grab the Bentley manual. it should have the wiring. Give The Pelican Parts parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts  
August 25, 2016
  Followup from the Pelican Staff: If two of the remotes are doing the same thing, I would think the antenna or module is at fault. - Nick at Pelican Parts  
Bruce Comments: I have a 97 993 cab. I can no longer use the remote fob to lock/unlock the door. the car starts as usual however rather than the normal "thunk" that i used to get when prepping to start the car, I get a faint click, but it works. Fob battery is new. any ideas why the fob stopped locking the door?
May 28, 2016
  Followup from the Pelican Staff: If the battery / key is new, it may need to be programmed to the vehicle. Assuming you have used it in the door and it has not relinked, I would get the remote programmed. - Nick at Pelican Parts  
novatech Comments: i have 96 porsche 911 model 993 alarm system goes off unable to reset and unable to pull any codes out of any system in car need some persenal help to diagnotic problem
April 17, 2014
  Followup from the Pelican Staff: Will the alarm shut off if you unlock the door or cycle the ignition key? If not, I would scan the vehicle for fault codes. - Nick at Pelican Parts  
SIMONBUILT RACE FABRICATIONS Comments: Hi I have a promblem with the alarm in a 993 twin turbo
and the custom er wants me to fit a after market one how mdo i remove or trick the old one 993 97 Twin turbo AWD
March 24, 2014
  Followup from the Pelican Staff: You can try removing the factory alarm module. - Nick at Pelican Parts  
Vaheh Comments: I have a 1995 993 convertible lost my remote how do I deactivate the alarm I can not start my car,by accident I used the key to open the car.and I have tryed using the porsche key code by unlocking n locking than unlocking the whole thing doesnt work the light on the clock wont blinck when it should belink any IDEA
February 11, 2014
  Followup from the Pelican Staff: Have to tried cycling the ignition key on and off? If it will not deactivate using the door lock, there may be an issue with lock cylinder switch(es). - Nick at Pelican Parts  
siifiso Comments: hi I found a problem it was a main fuze in the engine
November 13, 2013
  Followup from the Pelican Staff: Thanks for the follow up. We appreciate it.
- Nick at Pelican Parts
sifiso Comments: hi I have a ford falcon ef with no gauges light,immobiliser no light,no radio,no indicator light,nocentral locking
October 18, 2013
  Followup from the Pelican Staff: We don't have that vehicle here in the US. I would start by peforming a full vehicle scan using a Ford scan tool. - Nick at Pelican Parts  
junelporsche Comments: I have this problem. Any help?? Please emailme¤t=eb3bf441.mp4&evt=user_media_share
July 19, 2012
  Followup from the Pelican Staff: Looks like the vehicle is in theft mode, meaning the anti-theft system is preventing the vehicle from starting. I would try a different key to unlock the vehicle, then turn ignition to RUN position. If this doesn't do it, you will need to have vehicle scanned using a Porsche scan tool to see what faults are stored. This will indicate why it is in theft mode. - Nick at Pelican Parts  
Nod Comments: I have a 1998 993 and i lost the fob so i bought a used ecu module and it still doesnt work what do i need to do.?
February 25, 2012
  Followup from the Pelican Staff: You will have to program them. Do you h ave a Porsche scan tool? - Nick at Pelican Parts  
enrique Comments: helo,i have problems with my inmobilizer, the warming light doesen t work,so i cannot do anything, is there a secence to analise to diagnose the problem, the key number is in the inmobilizer module or in the DME????
August 12, 2011
  Followup from the Pelican Staff: Did you try to communicate using a Porsche scan tool? if it won't communicate, check power and grounds to the ecu.- Nick at Pelican Parts  
PremiumPorsche Comments: Hello, I am in the exact same boat as Vince993s - lost remotes, the car is in "armed" mode and I cannot use the "unlock, lock, unlock - ignition" sequence to begin the reset. Can anyone help? This is driving me bonkers -
October 25, 2010
  Followup from the Pelican Staff: Sounds like you might need a reset from the PST-2 tool. - Wayne at Pelican Parts  
Dave Comments: Pelican Staff - Thanks for the reply. I had to take the car to the Porsche dealer and the diagnosis was a faulty alarm module under the passenger seat. They said the 96 993 has six alarm modules and that they do fail over time. Cost $1200 Now works like new. Dave
August 10, 2010
  Followup from the Pelican Staff: Thanks for the follow up. We appreciate it.
- Nick at Pelican Parts
Dave Comments: I have a 1996 C2 Cab tiptronic that the remotes randomly work on locking the car. Sometimes they lock the car and sometimes they don't. The red dome lights on the door window sills blink twice when the locking mechanism doesn't respond. After restarting and shutting off the car a couple of times, the remote will then work and lock the doors. Initially this occurred only once in a while but has now progressed into a constant issue. Has anyone had this similar situation? Any insight would be most appreciated. Thanks, Dave
July 1, 2010
  Followup from the Pelican Staff: You can use the Porsche PST-2 tool to diagnose this, but I think that your issue may be related to the door lock switches. I'm not 100% sure, but I believe if they are not indicating the door is all the way closed, then it will give you these issues. There are also switches in the top that may be causing the same problems. - Wayne at Pelican Parts  

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Page last updated: Sat 2/24/2018 02:24:47 AM