Hello,Thanks for your question.Please don't forget to click my ACCEPT Button if my answer is helpful.Experts do not recieve a percentage of your deposit or offer unless you click our ACCEPT button.Experts receive a larger percentage of a Bonus than they do of the question value.So bonuses are GREATLY appreciated.Images available only to Customers.
Give this a try......
1.Get in car and make sure all doors are unlocked.
2. Open driver's door and leave open.
3. Put key in ignition.
4. Turn key to 'on position' (dash lights on, but do not start) and
back to
'off position' 3 times in 5 seconds or less. (you must turn the key
very
fast)
5. Close and open driver's door 2 times in 5 seconds or less.
6. Turn key to 'on position' and back to 'off position' 5 times in 5 seconds or less. (turn key very fast)
7. Close and open driver's door, the doors should lock and unlock twice.
When this occurs, push the lock or unlock button on the remote, doors should lock and unlock.
Push the lock or unlock button a second time and doors should lock and unlock again.
The above procedure erases all previous codes and adds the new code as,
#1. If you are adding a second remote, you should follow the same sequence with the exception of step 6; instead of turning the key to the 'on position'and back to the 'off position' 5 times in 5 seconds or less, do it 3 times
in 5 seconds or less and then continue to step 7.
***Remember to turn the key to the on and off position very fast.
And then there is this.....Call dealer for specific info on this Tecnical service bulletin.
Make : ISUZU Model : RODEO Year : 1998 Manufacturer : ISUZU MANUFACTURING SERVICES OF AMERICA Service Bulletin Num : 9813L004 Date of Bulletin: AUG 01, 1998 NHTSA Item Number: 603839 Component: OTHER Summary:
Images available only to Customers.
SERVICE INFORMATION ON REMOTE KEYLESS ENTRY / SECURITY SYSTEM REPROGRAMMING. *YC
Edited by railman on February 3 2006 at 5:34 PM
"It is much wiser and cost efficient to ask a question 
than to stumble blindly through your auto repairs".Please Click Accept if my answer was helpful.