No parking lights in back - 2001 Toyota Sienna

Do the front park lights work? The front and rear park lights should be on the same circuit. If no park lights operational, possible switch or power/ground issue. If only rear park lights not working, suspect burned out bulbs/wiring problem to rear lights

Sounds like a switch that want's to stay on. I'd pull the fuse for parking lights until I got it sorted out. If it's a rotory switch Wd-40 on the shaft may help. If rocker switch for just parking that may also help. Probably not for a push button switch.

Are all parking lights on or just front daytime running lights only? Either case sounds like a light control module in your fuse panel stuck.

There are 2 fuses for parking lights left and right side. so it can be 2 relays. located in the box in the front.

Sounds like the light switch is not always switching off. Try getting at the back of the switch and figure out which wire goes to the park lights (probably one of the smaller wires, you can possibly identify the colour of the wire by removing the tail light cover and seeing which wire goes to the park light globe). Once you identify the wire switch the lights off (I assume the rogue park lights stay on) disconnect the wire. If the park lights go off, the fault almost certainly lies with the light switch. If the rogue park lights remain on then power is getting to the park light wires after the switch. You could try to find where the park light wires are touching live wires ( a difficult job) or cut the old wires off at the switch and the park lights and run new wires from the switch to the park lights.
LPG

Hi, 1st check the bulbs in the back. Then check the fuses for brake and park. If they are OK the next would be the switches and ground connections. Good luck.

Security alarm module issue.

OK...the tail lights are on the same circuit as the park lights, so my question to you, are the front parking lights working with the switch on......

my passat 2007,parking lights on.

If they are both gone, you either have a bad ground wire or broken wire. See if you have power back there. The bulbs could be both burnt out.