Honda 2011 Insight Owner's Manual page 318

Carrying Cargo
Air Intake
AIR INTAKE
The air intake for the IMA battery
and electronics is located on the rear
left pillar. Do not block this air intake.
Doing so may cause the IMA battery
and the power control unit to
overheat, causing the IMA to shut
down. It will start working again
after it cools.
312
Do not spill any liquids over the air
intake or insert any foreign objects
in it. This may damage the IMA
battery and the power control unit.