Hdc

i was under the impression that if it didnt work it would just stall

speed didnt reach any number on dash as it was slow and didnt stall going uphill

matt1295 said:

i was under the impression that if it didnt work it would just stall

speed didnt reach any number on dash as it was slow and didnt stall going uphill

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Some one with better knowledge needed here. but HDC is a function of the TC and ABS and on very few occasions I used it, it worked fine but you new it was working! just trying to help you figure if it is working at all.

all help is greatly received i have had the car a few days and want everything on it to work even not going to be used alot

matt1295 said:

hello being out today tried several hills all of diff steepness and the hill decent must be working as it doesnt just stall but no light on dash

i have looked on the rave CD and it says what wire the bulb is (pin17)

so i put a temp 12v to that wire to try and make the bulb come on and nothing... put my test light to the wire tho and it has power even when disconnected from the abs ecu it still has some power in the wire and no bulb

bulb does come on when ignition turned on tho

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This is not how hdc works. You will never stall going down hill. The hdc applies braking to individual wheels to prevent the vehicle tavelling too fast down hil. The process is like abs but in reverse. Also it doesnt work going up hill bcause its called hil DESCENT control. However if you fail the hill and reverse back down it'll work. Engine braking will also control the speed of descent but wont if the wheels slip. This is where hdc comes in. When it kicks in it'll be noisy. Like abs is. Itll also muller ya disks in pretty quick time. But you wont crash and die which is a bonus.

i will go bk out again after dinner everytime i went to try down hill a bloody car came behind lol

being out again and it deffo works down a steep hill

Nice one. Be warned you will be able to descend hills you mght not be able to drive back up. And the pads n discs get a kicking too.

just need to work out now why the light on the dash doesnt work

matt1295 said:

hello being out today tried several hills all of diff steepness and the hill decent must be working as it doesnt just stall but no light on dash...

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HDC works by abs pulse braking the car if it goes above a certain speed. Put yer Freelander in 1st gear and drive down a hill at 10mph then take yer foot off all pedals. If HDC is on and able to work you will feel the car slow down by using the abs and not just slowing because it's in gear still. If not, then avoid hitting whats in front of you. An eggsample of hdc working on mine:

Freelander 1 v6 Hill Descent Control Demo Down Hill On Snow - YouTube

hello again after some more digging (working in the rain)

i have followed the Rave wiring diagram to find the white wire with pink stripe is from the abs ecu to the cluster

if i turn the igition on only and nothing more this wire becomes live i dnt have a multi meter just a test light at the moment but has a week power bulb on (test light lit slightly)

but auto data tells me a different wires is to the bulb but that has no power either when the HDC is switched on

does this mean a bad earth could be my problem as as the white/pink wire has power when disconnected from the abs ecu

after some more work i have removed the instrument cluster to find TC and the orange HDC light are missing so i took 2 bulbs from others and those to lights stayed one but no other light

i have read on the intrenet that a brake light switch can cuase this so took out and tested and its silky smooth and works




would a freelander 2000 w reg work with a obd reader or is this way to early

this is the brake light switch fitted to my car

http://www.ebay.co.uk/itm/Freelande...arts_Vehicles_CarParts_SM&hash=item20b83ccf3c

are the black boxes under the drivers seat a common fault for the TC amber HDC light being on or what about maybe a sensor on the gearbox

hello update

my new ABS ECU arrived today and still the lights have not gone out there is still no fault codes and yet the HDC amber and TC lights are still illuminated

hello today my switch arrived for the gearbox (had a wire handing in engine bay turns out the switch in gearbox was missing...

fitted switch today and the lights are still on TC/HDC

do i need to use diagnostic machine to turn the lights off or will they go off on there own

matt1295 said:

hello today my switch arrived for the gearbox (had a wire handing in engine bay turns out the switch in gearbox was missing...

fitted switch today and the lights are still on TC/HDC

do i need to use diagnostic machine to turn the lights off or will they go off on there own

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Actually no idea but a search for "the three amigo's" might help

(Apologies if this is all old - didn't read the rest of the thread )

Have you changed the sensors? More common failure than ECU.
Have you tried both sides? Front & back? (back and front are different though I think - not sure never changed a back one!)

Have you checked the accelerometer? (Does your model have one??)

matt1295 said:

do i need to use diagnostic machine to turn the lights off or will they go off on there own

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They go off on their own.

its not a sensor i fitted today its a switch on the gearbox.

i had a wire loose in the engine bay and i used rave to find out what the connector was and it was for a HTC switch on the gearbox my gearbox had a bung in it not another switch so i ordered a switch for it and then fitted that today

but my htc and tc lights are still on

matt1295 said:

its not a sensor i fitted today its a switch on the gearbox.

i had a wire loose in the engine bay and i used rave to find out what the connector was and it was for a HTC switch on the gearbox my gearbox had a bung in it not another switch so i ordered a switch for it and then fitted that today

but my htc and tc lights are still on

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bukko said:

They go off on their own.

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You've not fixed the fault then