Good Morning All,
My RR has just started to show the HDC program unavailable when you turn on the ignition/start-up and the brake lights are permanently on.
This shows on my GAP IID tool (see images below) but clears and doesn't come back.
After searching the forum I can only see either the brake switch or possible LCM failure?
There is no water in the vehicle and the battery is new. I even put it on charge last night to recheck this morning.
Currently at 12.2 v and charging at 14.7v
Anybody, any ideas?

Click image to enlarge

Click image to enlarge

as you have deducted..check the brake switch and then the lcm.. ... - .- -.




Y. O. L. O.
.

Thanks Stan.
I was kind of hoping for someone to give me a proverbial "magic-wand" solution!!
At least the brake switch and LCM are near each other for the strip out.. 2005 FFRR SC Java Black with Overfinch Exhaust (UK)
2008 D3 HSE Stornoway Grey (UK)
2008 D3 HSE Izmir Blue (ZA/Zimbabwe)
1995 D1 300 Tdi (Zimbabwe)