keyless entry problems....

:screwy: i have a 99 Altima, and am trying to program the remote. I followed the instructions below, and it works and accepts the new remote (step 4) but after I finishthe process, the remote does not work. So, after step 4 what am I doing wrong?? THANKS!!!
:screwy:
ID Code Entry Procedure

To enter the ID code, follow this procedure.

Entering "Setting mode":
(1) Close and lock all doors.

(2) Insert and remove the key from the ignition more than six times within 10 seconds. (The hazard warning lamp will then flash twice.) At this time, the original ID codes are eliminated.

ID code entry:
(3) Turn ignition key to "ACC" position.

(4) Push lock button on the new remote controller once (for example, if door is locked using the remote controller during this ID code entry enable state, a new ID code can be entered). At this time, the new ID code is entered. (The hazard warning lamp will then flash twice.)

Additional ID code entry
(5) If you need to activate additional remote controllers, unlock the driver's door, then lock again with door lock knob.

(6) Push lock button on the additional new remote controller once.

(7) This ID code entry enable state and setting mode remain until the driver's door is opened.

This is pretty much the same as I have and it worked:

Programming Instructions from the Nissan/Infiniti Factory Shop Manual

First, for entering "Setting mode": (1) Close and lock all doors. (2) Insert
and remove the key from the ignition more than six times within 10 seconds.
(The hazard warning lamp will then flash twice.) At this time, the original
ID codes are eliminated.

ID code entry: (3) Turn ignition key to "ACC" position. (4) Push lock
button on the new remote controller once (for example, if door is locked
using the remote controller during this ID code entry enable state, a new ID
code can be entered). At this time, the new ID code is entered. (The hazard
warning lamp will then flash twice.)

Additional ID code entry (5) If you need to activate additional remote
controllers, unlock the driver's door, then lock again with door lock knob.
(6) Push lock button on the additional new remote controller once. (7) This
ID code “entry enable state” and setting mode remain until the driver's door
is opened.

NOTE
Some people may find it tricky to get the system into "setting mode"...if you
don't get it at first, keep trying.
If you need to activate more than two additional new remote controllers,
repeat the procedure "Additional ID code entry" for each new remote
controller. If the same ID code that exists in the memory is input, the hazard
warning lamps will flash twice but the entry will be ignored. Entry of
maximum four ID codes is allowed and any attempt to enter more will be
ignored. Any ID codes entered after termination of the "setting mode" will
not be accepted. Additionally remote control signals will be inhibited when
an ID code has not been entered during the "setting" mode.

If you still are having difficulty, try changing the battery...just open the back
remote. Also, keep in mind
that your local dealer may program it for free or for a small charge. Be sure
you bought the correct remote that applies to your car...and of course, be
sure you car is equipped with keyless entry and the “brain” computer is
functioning properly. Thank You!

You have to use the lock switch not the knob.