Also in 2002, the Ody had an interior lights timeout feature if a door was left open. IIRC batteries were drained because someone left a reading light switched on. The timeout would not turn off the light in this case. So it would run until the battery was dead.Very cool and well thought out. I've been thinking of a circuit to shut off the interior lights after a predetermined time if a door is left open. I have one to try but my circuit knowledge isn't what it was 20 years ago. Of course when I go outside and find the van battery is dead I get to thinking I need to build one quicker.
One solution is to always turn the master interior light switch to off after a drive. Also, switch to LED lights as mentioned by wreckedGT. They run cooler and consume 1/10 the power, so the battery may still be alive when you return to the van.