hi. i have a 2000 s80 t5, i had to change the key.

here s the problem :

when i lock the car with remote, after some time, for example 10 mins, the remote does not respond and unlock the car. i unlock the doors manually, with the key, get in the car, insert the key in the switch, turn it on and then :

1-the headlights are on (the headlight key is off), no dashboard and warning lihgts, the engine does not start. then i turn it off.
2-i turn the key on again, headlights are off (the headlight key is off), the dashboard lihghts and warning lights are on. the engine does not start. then i turn it off.
3-i take out the key, then insert again, turn it on, then as usual, the engine starts.

everytime it happens step by step. nothing changes.

what is the problem? what should i do ?

thanks in advance.