I have a 2005 LR3 with multiple electrical issues that seem to be very similar to mutliple other posts including a recent post titled titled "HDC fault and other things" posted on 10/5/2021. I have replaced multiple things as listed below. I first replaced the Battery,brake light and brake light switch with no effect. Next, I used a basic OBD2 code reader which did show "P0504 Brake switch A/B correlation". I measued the voltage at the brake light switch and measured 0V. I subsequently found multiple corroded splices in the passenger footwell caused by a sunroof leak. I replaced all of these with heat shrink connectors and replaced the sunroof drain ends. Once I replaced the splices all the problems immediately went away.

I drove the car for about a week with no issues until my problems suddenly returned after driving in the rain. All the exact same warning lights are on. However this time the brake light switch still has power. I do not now have the P0504 trouble code. I still suspect this to be an electrical issue, but I do not know were to look next. Does anyone have any recommendations on where to look next?

Warning lights and messages:
"HDC fault system not available"
"System fault special programs not available"
"Suspension lowered"
DSC/ETC light on
Brake light amber
EAS light amber

Things I have replaced so far:
Battery
Brake light switch
Rear brake lights
Multiple splices in passenger side footwell. Including SJ667.
Sunroof drains x4

 

give your transfer case control module behind the battery for corrosion on the connector.

 

Thank you for the advice on the TCCM. I forgot to mention. I did check the TCCM and all the connectors behind the battery and saw absolutely no signs of corrosion.