08 Impreza NA 2.5 MT

Replaced Right cylinder head in NC. Drove back to NY State, with no issues, other than vibration at certain speeds.

Was ball joints.

Both pinch bolt heads broke off and had to drill them out. Once replaced, got P0500. ABS sensor. Friend has MAXISYS scanner and was able to go into the brake modules.

Replaced both left and right abs sensors, in addition to the driver side axle.

Codes gone, but I now have what seems to be a relay clicking. When the engine is turned to start, after about 5 seconds there is a sound  that seems to be coming from the radio area.

I get 4 cycles lasting about  1 1/2 seconds each. Even if I turn the switch off, after the sequence starts it will continue to the end.

Removed radio and the temp control unit, but still cannot locate the source. Looking under the dash area, there are no relays there. As close as I can tell , the vibration is near the firewall.

Nothing in the engine bay in that area.

Will add a video as soon as I can, in the midst of replacing a phone.

Suggestions???

I'd ask him to hook up his  MAXISYS scanner and check to see what is happening.

Update.

Looked at everything with the Maxisys. No change.

Am getting ready for a trip so I wanted to put my BT Kenwood in until I get my car.

Turned the key to set the functions. NO clicks!.

Tried it again, no clicks.

Don't know the whys or wherefores, but I am a happy camper.

 The Subaru radio has an Aux jack and a ground lug.

Everything goes through the connector on the Kenwood.