I had all new struts put in earlier this week (Monroe Sensatrac). I made sure the rears had the ELC option. The mechanic, said when he unplugged the old struts, no air came out, which led him to believe the air pump was not operational. The next day, I opened the trunk and turned on the pump and hear the relay click (under the carpet, between the rear seat and the passenger strut).

Is there anyway to test if the pump is working?

Thanks! I'll give it a go and see what happens.

If you feel like crawling underneath, find the yellow wire between the level switch and the compressor and ground it. This will cause the pump to turn on (don't flinch in surprise and bang you head) Do this with the key to "run". If it doesn't start, check if 12V is on the yellow wire

The pump should run to level the car about 30 seconds after the car is started or the key is turned to "on." On my Buicks it'* loud enough to be heard in the passenger compartment if the radio and blower aren't on. It'll run for about 4 seconds and shut off.

On Friday, I depressed the shradder valve when the car was off and no air came out (should the car be on?). However, today, I started my car and was outside talking to a buddy when I heard the pump kick on (about 30 seconds after start). It was that buzzing sound for about 5 seconds. I will try depressing the shradder valve again tomorrow to see if it'* now working.

That shows that the ELC part is working. If it doesn't work for the ancillary duty on Bonnevilles of providing an air pump with separate switching, that tells you which parts to troubleshoot.