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martin41076

Active Member
Already posted about this previously but issue remains.
55 plate Freelander TD4
TC/HDC lights on dash.
Have replaced brake light switch twice.
Checked all earth points around car.
All fuses OK.
Brake lights work.
All connections sprayed with contact cleaner.
Ran a diagnostic on a Topdon ArtiDiag500, showing C1221 Brake Pedal Switch Electrical Failure.
Ran full diagnostic, machine detects when brake pedal is pressed/depressed and when HDC is turned on and off.
Not sure if it's linked to the second plug next to the brake light switch but not sure of it's purpose or what it's called - can't find reference to it anywhere?

Any ideas anyone? I'm scratching my head and it's the only thing stopping an MOT.

Thanks.
 
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Had the same. Can't easily identify the other hall effect sensor. Think it is to disable cruise control but may have other functions. Seems to be fitted whether you have cruise or not.

Like you, I replaced the brake pedal switch and no change.

Have you got the later switch and a short conversion loom? On a 55 plate you may have this already, but I fitted it with the short loom and problem cleared. I think the switch was modified so that it gave a more precise or better timed signal to the ABS that controls the HDC and TC.

Will try and find thread with photos.
 
New one looks like this.

Screenshot_20240721_200412_Google.jpg
 
Just a note on the subject of the modified brake switch which might help others.

Bought one with the lead to fit to my TD4 Sport. It has had a very occasional TC and HDC light come on when braking despite cleaning old type switch.

Before dangling under dashboard I tested the new one with an ohmmeter.

Plunger didn't break contacts it should and contacts that should make didn't.

In the design it has a blue 'nib' that turns as you install it. Only when this nib is turned does the plunger lock to the electrical part of the switch.

See photo for blue nib.

Might catch others out. Had me thinking for a bit !!

Screenshot_20240911_155905_eBay.jpg
 
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A friend of mine had this trouble, tried everything, even the new switch did not solve it, then he cleaned the plug on the brake reservoir, fixed right away.
 
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