clifford 3.5 runtime programming

I have a clifford 3.5 in my denali...When I use my remote start it has a defult time of 12 minites of run time. Does any one know how to program it to run longer.  I know it can be done up to 60 minutes in programing. I just dont know how to......Any help appreciated thanx

It says it needs a bitwriter...can anyone tell me more about this than x

To program it with the valet switch do the followin,

Open the drivers door.

Turn the ignition to the on position (not run) then back off

Withing 5 Sec. hold the valet switch in, the siren should chirp once, release the button and hold it in again, the siren should chirp 2 times, release the button and hold it one more time the siren should chirp 3 times. This means you've accessed Menu #3 (which is in the install manual)

Within 10sec, press the valet switch 3 times and hold it in on the 3rd press. This puts you to Menu #3  Feature #3

Press the unlock on your remote once to set the remote start timer from 12mins to 24min. Press once more for 60min timer.

When the desired time is selected release the valet switch and close the door to save the settings.

You dont need a bitwritter for this it just makes it easier.

http://www.directed.com/guides/manuals/ig/clifford/N919564_6-03.pdf

I tried it about ten times tonight and not seeming to work.  It does everthing you said it would it chirps evertime I go to another channel.. and I hit it three times and on the third I hold it then I hit unlock on the remote and when I close the door the siren goes off for a second though is that right.....when i remote start it  it goes to 12 miniutes.  What do you think im doing wrong.........i tried lock and unlock I hit it once and twice

hit it three times then hold it on the4th.  that bumps you to one two three HOLD ON 4. 

also, make sure you initially hold it for a while.  it should blink/chirp once holding it, then twice, then 3 all together meaning you accessed menu, one, two, then three.  then release it.  press it one, two, three, then hold on 4, press the ch. 2 button.  then turn the ignition on and off to exit programming.

bitwriter is optional.