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if the acc is on, I believe it will function in number II position.
If fiddling with the key while in the II position while the car is working and either turns on or off the ACC then you can be sure the issue resides with the keyway/contacts
Other rare, but equally frustrating, causes is a bad engine temp interlock, located somewhere around the thermostat housing. If it is failing or near failure it will cause strange on /off behavior . It basically is the sensor that tells the system to turn on.
I know because this was my gremlin, after months of swithing out parts , acc units and the like.
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Ron
2015 Porsche Cayman - Elizabeth
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD 
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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