It is in one of 2 places. Either in the underhood electrical center(fuse block), or under the truck on the driver side frame rail, rearward of the ABS brake module assembly.
SOURCE: where is the checkvalve for air pump located on
just below and slightly on the left of the cover for the spark plugs and below the hose that comes off the air filter towards the back.
SOURCE: Where is the relay for the air pump located on the air suspension?
Located front center of engine compartment, above the right cooling fan.
SOURCE: 2005 envoy Code po 410. Replace relay and air pump
try disconnecting the battery for 5 mins. see if the computer resets
SOURCE: 2005 trailblazer LT..code po410 secondary
if the pump is fine, there must be water in the system. Check the entire system for water build-up or replace the pump
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