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Google Honda pilot block heater. There is a parts dealer that includes installation instructions showing where the plug is to drain the coolant. This is where the block heater screws in, replacing the bolt.
The head lights are the biggest long term drain on your battery. (The starter is a heavier drain, but you can't leave it on for very long.)
Look under the front of the Pilot. The drain plugs for the transmission and engine are both under the front and both have labels next to them marked ENGINE OIL and TRANSMISSION OIL. I suggest you get the Haynes manual for the Honda Pilot which explains how to do all this easily. Good luck.
17mm socket will work fine
Dead cell in the battery requiring it be replaced or something is on pulling power from the battery. Some light or relay.
When the battery light is on. That means your charging system isn't working. You should have your system check. It will drain your battery.
Is it required to change the crush washer on the engine oil pan drain plug
Easy, look under front end of the pilot and then look to the right side front of the transmission. It is a drain plug that colored blue. It is easy to see and when you find it. Use a normal richet , I think a 3/8 to take it off. The richet itself will fit in the slot. I fill it from the dip stick near the battery.
No, a bad coil will not drain the battery.
Sorry, there is not a drain plug. Check local repair shops and have a BG transmission flush done. That way you are getting ALL of the fluid changed. Yes, there IS a drain plug. I have a 2003 Honda Pilot AWD and do the transmission oil changes myself. Crawl under your Pilot and have a look. The transmission drain plug and engine oil drain plug have labels next to them so you KNOW which is which. Don't listen to people who tell you crap like the answer above. You can also perform your own rear differential oil changes easily. The rear differential and the auto transmission BOTH require oil changes every 15 K miles so it is much cheaper getting the oils from Honda (DO NOT USE ANY OTHER BRAND OF OILS!) and doing it yourself. The rear differential uses VTM-4 oil and is only available from Honda. NEVER SUBSTITUTE FOR HONDA OILS. If in doubt, get the Haynes PILOT repair manual which shows you how to do all this maintenance. Good luck.
The main cause of battery drains is a bad electrical system. The electrical system is normally powered by the alternator and once the alternator goes bad the battery has a hard time holding a charge,
Left / front (driver's side) of transmission has a large plug nut. it uses a 3/8 socket wrench (insert socket handle into hole in drain plug - left loosy)