HDC System fault, Special programs not available

**Graeme** · 23rd February 2014, 07:10 PM

It probably didn't need to go into off-road height, only that the raise switch be pressed to take the suspension ecu out of its error mode, perhaps then requiring the lower switch to be pressed to cancel the off-road height mode request.

If the suspension ecu is not fully operational as well as every other system that special programs uses then special programs are not allowed.

I suspect the suspension or some other ecu considered that the battery voltage was too low to run the compressor and therefore the suspension ecu went into a basic mode, with the visual indicator being the flashing raise and lower LEDs.

**PeterOZ** · 1st March 2014, 01:10 PM

So far so good though the battery is definitely on way out. Trying to work out which one to get.

**jonesfam** · 1st March 2014, 05:49 PM

When I was recently having my battery changed the bloke doing it hooked some little thing up to the battery cables before disconnecting the battery.
When I asked him why? He said it kept enough voltage going through the car that all the electronic systems would not go nuts when the battery was removed.
The car was as per normal after the new battery fit.
Jonesfam

**discotwinturbo** · 2nd March 2014, 09:09 PM

Originally Posted by jonesfam

When I was recently having my battery changed the bloke doing it hooked some little thing up to the battery cables before disconnecting the battery. When I asked him why? He said it kept enough voltage going through the car that all the electronic systems would not go nuts when the battery was removed. The car was as per normal after the new battery fit. Jonesfam

They do that so radio codes etc are not lost on your average car, However, Discoverys like a good reboot every now and then. Brett...

**willem** · 3rd April 2014, 12:55 AM

I don't know if you've fixed this yet, but I reckon if you replace the battery you'll fix the problems.

Willem

**PeterOZ** · 5th April 2014, 05:03 PM

It's fine for the moment. Battery has give grief once more. Have to a deep charge for a day and so far it is behaving.

**WhiteD3** · 5th April 2014, 05:38 PM

I'd be checking the battery volts at start-up.

**PeterOZ** · 5th April 2014, 05:38 PM

Did that

**putauaki** · 7th April 2014, 07:41 PM

Hi all,

Sorry to Hijack this thread but I have been having HDC issues, Car alarm going off, suspension always lowers when vehicle is parked and the occaisonal transmission fault. Have I mentioned the radio playing classical music when preset 3 is selected prior to starting the car?

I have noticed that the battery is holding 12.7 volts with the terminals off. As soon as the terminals are back in place the voltage drops to 12.4 volts. There is a dip when cranking and the voltage across the terminals gradually increases to 12.7volts. Not sure how to check the alternator.

Oh and my left hand brake light is always double brightness.

So I have been reading around and have come to the conclusion that it's either (or a combination of) the battery, alternator and/or brake light switch.

Does anyone have any ideas for me at all? I would love to call a mechanic but getting to one at the moment is really not an option. At least for the next couple of months.

Thanks in advance!

**PeterOZ** · 7th April 2014, 07:42 PM

Vintage across the terminals with engine running?

Thread: HDC System fault, Special programs not available

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