In rec.autos.makers.honda sharx333 <emil.santos@gmail.com> wrote:
> I don't know the exact rating of the bulb (aftermarket dome/trunk
> light), but it glowed brightly. (All doors/trunk was closed, key off)

That might be a low wattage lamp, and glow brightly at a low current draw.
A stoplight bulb is a better choice, perhaps. I could look at autozone.com
to find the dome light bulb number, and then sylvania.com for the bulb
specs, but I think you found your culprit.

> I tried pulling underhood fuses and even disconnecting the alternator,
> with no result. Then I tried pulling the cabin fuses, and I found that
> it was the Pioneer head unit that was pulling most of the power (for
> the preset memory, I guess).

I think you are indicating that 170mA made the bulb glow dimly, and the
Pioneer made it bright. That's not good. The pioneer should only draw a
few milliamps in standby. There should be a figure in the manual.
There should also be a standby control on the Pioneer.

A voltage supplied to the Pioneer that is always on is expected to be a
heavy current feed for the amplifier, that also draws a tiny amount of
power in standby. There should be another switched control that comes on
with the radio or ignition that cause the Pioneer to turn on its
amplifiers. I think yours is switched on all the time.

Or maybe not... ;-) Check the manual for some specs on the Pioneer.

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Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5