Drove an '09 base TSX and when in reverse there was a verbal warning, didn't activate when in reverse and nothing behind me.
Didn't see any bumper sensors either.
Is this something aftermarket?
Any links to service intervals and what is done on '09s?

Thanx

 

It's probably aftermarket like the one that uses electromagnetic sensors here, or it was possibly located elsewhere like the poster who mentioned the "exposure type": https://acurazine.com/forums/1g-tsx-2004-2008-124/anyone-install-backup-sensors-691521/

The OEM backup sensors are installed in the bumper after the holes are drilled into the bumper. You can see the instruction guide at http://www.handa-accessories.com/tsx09.html .

 

For the OEM backup sensor, is there a audible beeping sound?