The day time running lights on my 2000 E320 do not shut off when I turn the ignition off and remove the key. The switch allows me to access (and turn on and off) all of the other lighting modes/options, but the running lights stay on. I have to remove a battery cable at night to avoid draining the battery. I replaced the original battery (got almost 9 years out of it), but the problem remains. Any advice?

2000 E320
102,000 miles

Thanks