IainM

Did you try disconnecting battery for 10 mins to reboot the ECUs?

Jay777

Only the 95 rev 1 schematics show cylinder-lock microswitches. None of the later ones do. So unless you have an early 95 build, they were never installed in your 993.

abiazis

My 95 unlocks both doors from either door............

pp000830

Hi Jay,
The plot thickens... you are saying later built cars didn't have them, so why were they added back in in 1996?
Could a revised drawing simply be that a revised drawing where some details were omitted as a clerical error?
If you are correct and one makes the leap of faith that the wiring harness doesn't have connections for them could a run of wires from each of the doors to the center console switch make for an easy DIY retrofit for Marcus's car?
The drawing I have is marked "Printed In Germany 11, 1993" and also "97-5" that seems to be a drawing number or page. The switches are present, can't say what this means.
Andy

Jay777

Andy,

I don’t know anything beyond what the Bentley schematics show. As far as I can tell, only the original 95 schematics show a cylinder lock switch on each door, both of which are wired to the “prime”/“unprime” terminals on the central locking box. The 95/2, 96 and 97/98 schematics don’t show them. - Jay

Lorenfb

The later 993s had the microswitches in the door lock actuators. See Sheet 2 of the Porsche Wiring Diagram for Model 97/98.

Jay777

-All 993's have DOOR LOCK ACTUATOR microswitches (P/N 96461313400).
-Early 95's also have CYLINDER LOCK microswitches (Sheet 2 of the 95 schematic, F11, G11). I believe this is P/N 96461313400 shown in post #5.

Enzo101395 reported not seeing microswitches "attached to the exterior handle", so I assume he was referring to the CYLINDER LOCK SWITCHES shown in post #5. Unless he has an early build 95 what he's seeing is to be expected.

pp000830

Hi Jay, I'm a little confused, maybe a typo as the part number for what you call "door lock actuator microswitches" and "cylinder Lock microswitch" are the same part number above.

Also in both the USA & ROW catalogs, only one switch is called out, the one that fits to the keyway and it is specified for years up to 1994 in both. Clearly, if later cars have the switch there is an error in the catalog.
On my 1996 if I turn the key both doors unlock and seeing that there are no other switches internal to the door in the parts catalogs it suggests the switch to the keyway must be present or some other switch that is not listed in the catalogs is part of the lock mechanism. In either case, a switch must be present for both doors to unlock.
Andy

Jay777

Andy - Thanks. Hadn't noticed the 2 part numbers I pulled off 2 catalog pages were the same. Still, it's hard to reconcile the 2 sets of switches shown in the 95 schematic (one of which is called Lock Cylinder) with the parts catalog. Did they leave out a note saying only early cars had Lock Cylinder switches?

The catalog shows a "Transmission Element" (P/N 928-624-211-00, illustration 804-15) which I assume is the actuator. The schematic shows switches inside the actuator which explains why no separate actuator switch part is called out. There are 2 versions of the door harness: 94 and 95-and-later which would be consistent with different lock/actuator wiring.

BTW, my 97 behaves like yours - turning the key locks both doors. But that doesn't necessarily require a cylinder lock switch - the key may actually moves the actuator, whose switches are sensed by the Alarm/Central Locking unit, which unlocks the other door.

So still a mystery. Then again, maybe Enzo solved his problem and we can all go home...

pp000830

Yes, you bring up a good point about the actuator. In fact, it is an electromagnet so if its plunger is moved by turning the key it would induce a small electrical pulse. Maybe a pulse the ECU can see and know to unlock the other door. Makes sense as auto manufacturers strive to take cost out of manufacturing their vehicles and if they can do it while improving reliability it's a plus.
Andy

enzo101395

Update: I went ahead and just pulled the trigger on a used immobilizer with a fob programmed to it. Should do the trick. At this point I still don't know what the double flash is but im guessing it has to do with the door microswitches.

Shadow6610

Hi @enzo.Sorry for jumping to an old thread. I have exactly the same problem. I can do all the steps to disable the inmobilizer but I in the next step the fobs cannot be programed. Dual blink on alarm-led means something is wrong. I checked doors, trunk, engine, glove box and radio. all good. Continuity of each cable to the alarm tested and all switches are working. The only suspect are the microswitches. How do you manage to solve your problem? thanks!