Thread: Transmission fault/HDC fault

Originally Posted by trevorj

+1 for the brake light switch; early MY11 D4.
Replaced 6mo ago; no further problems.

So the D4s do it too? Did they cover it under warranty? You must have barely been out of the sale room!

same same..brake light switch. In fact got it to go away for a while by disassembling and cleaning switch mechanism. Temporary fix only.

I have a MY11 D4 2.7, and it had a faulty brake light switch. This was the second time I had taken it offroad - and it was an extreme case of what can happen! The faults thrown on the dash were:
emergency brake assist not available; gearbox fault; HDC not available; and park brake fault.

Not pretty - the car lowers - "for your safety"

It is a good idea to take a video or photo of the fault messages - then LR can't refute the issues. I have such a video and no issues with warranty.

BTW - this fault occurred on the road into the 4WD area.

Where is the brake light switch located....is it under the brake pedal ?
Brett....

The link below relates to me changing the brake light switch on my 2005 LR3.

I think the D4 is about the same, ignoring the variations due to the location of the steering wheel. Like all things Land Rover, replacement is easier the second time around, but I can say that very little of my blood was spilled in the learning experience.

DISCO3.CO.UK Photo Gallery - Brake Light Switch Replacement

What does bother me is it sounds like these newer brake switches may not be improved versions but merely just new. Is the switch another one of those pieces to add to the spares kit?

Originally Posted by bbyer

The link below relates to me changing the brake light switch on my 2005 LR3.

I think the D4 is about the same, ignoring the variations due to the location of the steering wheel. Like all things Land Rover, replacement is easier the second time around, but I can say that very little of my blood was spilled in the learning experience.

DISCO3.CO.UK Photo Gallery - Brake Light Switch Replacement

What does bother me is it sounds like these newer brake switches may not be improved versions but merely just new. Is the switch another one of those pieces to add to the spares kit?

Googling the part number XKB500110, shows genuine and non genuine...maybe non genuine is better. Seems to be the same part number for the D4 and RRS.
I am going to purchase one.....just in case.
Brett...

Hi All,

I have these errors coming up and have had the fuel gauge sender in the tank replaced and the fuel pump in the tank replaced due to hard errors on both of those. But the errors are still coming up. If the brake sender or brake lights are an issue will it happen even when not touching the brakes? Mine seems to always happen when putting the accelerator foot down, usually on slight rises and has even happened when the cruise control was on and accelerated for a rise. I have a Tekonsha P3 brake controller that usually stays in the car and connected but it has happened with and without a trailer, today it happened with the boat trailer which has override brakes so the controller is not being used.

Thanks,

TimJ.

Yes, the problem exists even when one does not have ones foot on the brake, actually I think maybe it would not happen if one "rode" the brake.

If you find the stop lamp switch S215 on the pdf below, you will see that while the set of contacts that operates the actual brake light filaments is normally open, the second set of contacts is normally closed and allows signal to the ABS module D277. From there, like Sarah Island, there is no escape.

Also you will note how the Hill Decent relay R222 ties into the tail light circuit so that is why you end up with HDC error messages and Cruise Control not available.

DISCO3.CO.UK Photo Gallery - Brake Light Switch Replacement/Stop Light Lamp Circuit pdf

This will never happen on a Series Rover or a recent Land Cruiser as neither has Hill Decent circuitry. As for Anti Lock brakes, it was never clear that the Series units really needed brakes; for current LC production, Antilock Brakes may still be on the "Available" list of options.