Help - ABS-like rattling noise when rolling backwards

This is on a 2013 TRD offroad 4x4, automatic.

When stopped on a hill with nose pointing up and in Drive, I take my foot off the brake without accelerating and as the truck starts to slowly roll back. Then there is a trong rattling noise coming from the driver side dashboard. It sounds a lot like when ABS kicks in.

Anyone experienced this? The dealership can't/won't reproduce it. It can reproduce it every time.

 

Normal.

Surprised your dealer doesn't know this.

 

Is it the ABS?

 

Hill start assist control? http://www.toyota-global.com/innova...echnology/technology_file/active/dac_hac.html

 

Want to say hill assist control.

Prevents the truck from rolling backwards. Quits after a second or 2. Yes it is the abs system.

Mine did it the first day I had it on my driveway and it scared the mess out of me. I can easily recreate it also. I forget which light on dash flashes but one does.

 

Makes total sense. Thanks.