06 odyssey radio no work on remote start

You most likely missed an accessory wire, possibly an ignition wire. What all did you hook up in the ignition harness?A DMM is a beautiful thing.

MECP Advanced Installer Certified.

WHITE/ red is 2nd accessory and it is located at the ignition switch

It's up to you, but I think they did it the best way. I only power up the radio during remote start if it's absolutely necessary. I see two reasons for this: 1. If you park the car with the radio on, and then remote start it at some very late or very early hour, do you want the radio disturbing your neighbors? 2. If you park the car with the CD player on, and then remote start it, when you get back into the car to drive away, you've now "missed" about two or three songs from your CD. I've done every Honda I've ever done this same way---literally hundreds and hundreds of them. Nothing will break or give you problems. Like the others said, if it's something you want, it should be just a simple matter of connecting the remote starter to the car's second-accessory wire. They either connected the ignition wires inside the steering column, or at the fuse box by your left foot. Taking the column apart on those vans sucks. The fuse box location isn't too bad. Depending on the remote starter, it most likely does have an output for the second accessory, and hopefully, maybe, the installer ran that wire right along with the other ignition/accessory/starter wires....with some luck, maybe it just has to be connected. If you're handy with electrical stuff, have the necessary tools, have electrical testing equipment such as a multimeter, you might be able to do it yourself. However, if you do this, and anything goes wrong, as soon as the installer sees you were in there messing around he might not want to warranty anything anymore, whether it was your fault or not. Probably best to let them do it.