Centre diff warning light flashing constantly, also stability programme light showing "off"

ESC is what some manufacturers call ESP.

The traction control system uses the wheel speed sensors of the ABS (antilock brake) system but instead of releasing the brake of a wheel that is locking, uses a different programme to apply the brake of a wheel spinning under acceleration. I believe the ESC system is similar in principle but a more refined programme to increase vehicle stability.

Servicing the system is a specialist task requiring access to some sophisticated electronic equipment and somewhere in the process there should be an experienced thorough visual inspection of all the external components.

Disconnect the battery for 5 minutes and see if system clears.

i believe they are related to a abs problem. the car uses the abs to control the stability (braking on certain wheels when nessisary) there is probably a malfunction in the abs system that's why the light is on constantly. this would need to be looked at by a professional repair facility.

you shouldnt be in 4 wheel drive on bitumen you will get "bind up" of drive train which can cause damage or excessive freeplay in other components in drive train, inspect freeplay in universal joints on tailshafts, centre bearing and diff backlash specs, some backlash is quite normal, inspect trans/transfer case mounts also.

is it always light
it only needs reseting with a scan tool

It stands for Vehicle Stability Control When the VSC system takes control it activiates stability correction. The slip indication light flashes while the buzzer activates. The VSC is able to operate at all times except when the centre differential is locked. When the centre differential locks, the VSC-OFF light in the combination meter illuminates to inform the driver that the VSC function has been turned OFF. The centre differential lock is designed for freeing the vehicle if it is stuck in mud for example, however it would be difficult for the vehicle to free itself if the engine output were reduced due to the operation of VSC. Therefore when the centre differential is locked, the VSC function is turned OFF.If a malfunction occurs in the VSC system, the VSC warning light illuminates to alert the driver. If the vehicle with VSC begins to oversteer or understeer because of an emergency avoidance measure, or by excessive speed in a corner, VSC will automatically activate. By adjusting the engine’s power output and braking each wheel independently, VSC helps to return the vehicle to a ‘zone of stable operation’..

This is the indicator for ESP (stability control). If you look on your dash, you'll see a button with, you guessed it, ESP written on it. This allows you to turn your stability control on and off. If your light is on constantly, try pushing the ESP button. If it flashes on and off (ie during hard driving) this simply means it is working.

Acording the online manual , that is the Hybrid system warning light. I havn't tracked down exactly what it means , but is is grouped in with other service reminders. Will add more info when i find it " Google 2005 prius warning light " one of the first listings has a link to toyotapartsandservice.com

most of the new cars with such computer system to control the engine and other functions , such as brakes, anti-freeze level, that why the light on and tell you that you should watch out certain things, you still can drive the car, but you have to go to the dealer and let them check you car and reset the computer system and then all the light will be off.

Check to see are your brake light working! if not you have a faulty brake light switch - 10 min repair job at your local VW service centre. With no brake lights you'll need to get it seen to ASAP!!