Programming Procedure Document, select the print icon on the button bar at the bottom of the document image when gliding your pointer over it. The document will open in a PDF reader where it can be printed or saved to your local computer.
Jay from IMMO BLOCK points out that in both procedures with or without a working fob the need to wait a period of time in step "A" to prime the the system is unnecessary as the IMMO BLOCK has the immobilizer primed prior to and during the subsequent steps.
The below should only be investigated after several attempts to program fobs have failed. This is because of the variability of the human aspect of the process and just because the ignition or keyway switch is a little noisy or intermittent doesn't mean on the third or 4th try one will not be met with success, rarely does one experience success on the first or second try. Recently I helped a 993 owner go through the process where I read off the steps as he ran through the procedure. It took us five or six attempts before we were successful.
Three reasons the programming process fails even when the system seems fully functional with no fault indications:
The Keyway Buzzer Switch (separate from the ignition switch):
If you find the procedure above fails just after the Set-Up steps you may have a faulty ignition keyway buzzer switch.
Jay of IMMO BLOCK fame informs us that a a faulty keyway buzzer switch thwarts any effort to program fobs. The switch is part of the ignition lock. replacing it is easy but getting to it can be challenging for some.
A leading indicator that you may have this issue is that you have never heard a buzzer from leaving your key in the ignition.
The switch can be temporarily bypassed by identifying the wiring harness pigtail to the switch and bypassing the switch connection.
The keyway buzzer switch is the small rectangular item with the two connection prongs on the ignition lock & switch assembly
The Ignition lock & Switch Assembly
Gert from Rennlist describes how he replaced the switch "by removing the air vent and the central informer to use a screwdriver and a mirror to replace the switch." It took him 40 min. to get the job done. Gert is a skilled guy so expect it to take a bit longer.
Another alternative is to unplug the ignition switch from the wiring harness on the back of the ignition lock assembly, drill out the tamper-resistant rivets behind the ignition key facia ring and remove the entire lock & switch assembly. This approach may only be worth doing if you plan to service a worn keyway cylinder.
The keyway buzzer switch part number is 911 613 125 00
A failing ignition switch can make electrical noise when transitioning from off-on-off as required in the programming steps. This will misccomunicate the number of ignition key turns during the programming process. The fix is to unplug the switch from the wiring harness, remove it from the back of the ignition keyway and replace it.
The ignition switch is the large round multi-pined item attached to the back of the ignition switch assembly shown above.
The Ignition switch number is: 964 613 012 00
Rennlist member LORINFB "states when attempting to add keys to a car where the Motronic (DME) ECU has been previously modified to eliminate the immobilizer:
Disconnect the DME ECU [Bosch Ignition Computer]. It's under the drivers seat next to the immobilizer.[ only disconect the DME ECU with the car battery disconnected][ LORINFB] coded many immobilizers for new remotes without having the DME ECU. The coding process only requires two signals from the ignition switch, a #30 power,the alarm light, and a ground."
If you wish to attempt the procedure here is a page that includes how to gain access to the DME controller discussed above:
Other issues that can influence the working of the remote fobs:
The interior dome lights, the glove box light, the frunk light, their fixtures, and switches are all related to the Alarm and Immobilizer so any bad behavior of any of these components may interfere with the Remote Entry/Alarm/Immobilizer/Cabin Lighting system. Resolving these issues is discussed on this page.
If you found this page informative return to the main page and bookmark it for future 993-related servicing, repair, and upgrading guidance & information. If it saved you some time, aggravation or even some coin, consider donating through the button on the top left margin of this page.
#matingkeyfobs
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