Also page 228 of the manual explains how to turn Off the automatic parking brake mode which I found annoying and not necessary in most situations. Also a bit problematic in the winter.
On my ORP I finally found that I could only get the DTR's to work during the "daytime" with the light-switch set to Auto the engine running and Park brake off. As soon as it gets dark like pulling into the garage the "headlights" take over.