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<E34> Service Indicator Reset

I have recently purchased a 1991 model 535i with approximately 37,000
miles.  I just changed the oil with three green lights showing on the
service indicator.  I wish to reset the service indicator and have looked
up the procedure in the FAQ's.

Following the FAQ's, I have placed a jumper between terminals 7 and 19 and
turned on the ignition for approximately 4 seconds.  This procedure has had
no effect on resetting the lights.  I still have three green lights
showing.

I understand that the reset procedure is capable of resetting the oil
service and the inspection indicator which use the same green lights.  I
also understand that the inspection indicator resetting procedure requires
approximately 12 seconds to reset.  Is it possible my car's computer is
expecting the next reset to be the inspection reset and not just the oil
reset.  Therefore, the shorter duration oil reset will not work?

I would appreciate any guidance anyone can provide.  I would like to get
these indicators reset.

TIA,

Barthe in Houston