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Angus_Beef



Member Since: 30 Apr 2015
Location: Oslo
Posts: 434

Norway 2015 Defender 110 Puma 2.2 SW Corris Grey
P0504-62 (2F) Brake switch A/B correlation
P0504-62 (2F) Brake switch A/B correlation - Algorithm based failure - signal compare failure
Triggered 01.10.2021, approximately 4000km ago.

When cleared the code comes back immediately.
Brake lights all seem to work.
Cruise control I installed in June still cancels when brake is pressed (connected to one line on the brake switch at the pedal).
Trailer electrics undamaged and still covered in ACF50.

Everything seems to work?

Oil change coming up so I decided to scan for codes as I haven't done that in a long time and found this one. Cant seem to find anything visually wrong.

Any ideas? Roaming around 🇳🇴🇨🇭
Post #929386 11th Nov 2021 12:10pm
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Angus_Beef



Member Since: 30 Apr 2015
Location: Oslo
Posts: 434

Norway 2015 Defender 110 Puma 2.2 SW Corris Grey
Turned out to be a very easy fix. There are two brake switches, and one had come loose from its very flimsy mounting. Roaming around 🇳🇴🇨🇭
Post #929401 11th Nov 2021 2:07pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

Embarassed ESP worked good at lest beater than inter net crash then traying to reply this morning Thumbs Up
Post #929426 11th Nov 2021 6:57pm
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Angus_Beef



Member Since: 30 Apr 2015
Location: Oslo
Posts: 434

Norway 2015 Defender 110 Puma 2.2 SW Corris Grey
hey if it works, it works. thanks mate! Roaming around 🇳🇴🇨🇭
Post #929431 11th Nov 2021 7:40pm
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doublea



Member Since: 12 Jul 2011
Location: Aberdeenshire
Posts: 494

Scotland 2016 Defender 110 Puma 2.2 Adventure Phoenix Orange
Angus_Beef wrote:
Turned out to be a very easy fix. There are two brake switches, and one had come loose from its very flimsy mounting.


Are these the switches?


Click image to enlarge


Just had this code on both my 110s within a week of each other, one at 18000 miles, the other at 76000 miles. Current Steeds:
2015 110 UW in Grasmere Green
2003 BMW F650 the Hack
2000 Elise
1992 Ducati 888 (no longer in bits, yahoo)
1990 TDR 250 (in bits again)
1988 TDR 250 (no longer in bits) and for sale
Post #1001467 23rd Jul 2023 10:30pm
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doublea



Member Since: 12 Jul 2011
Location: Aberdeenshire
Posts: 494

Scotland 2016 Defender 110 Puma 2.2 Adventure Phoenix Orange
I've just been reminded that sometimes you should start with the basics..

After messing about swapping these switches from our third defender, the brakes mysteriously started binding on all four wheels, only releasing after being left for an hour or so. So I then discovered that although the pushrod retracts fully when the switch is loose, the retraction of the pushrod part is fixed when the switch is twisted into place. I had pushed the pedal down when I fitted one of the switches, so the pushrod was too long and was stopping the brake pedal returning fully. Embarassed Once re-fitted with the pedal in the up position, binding solved.



Click image to enlarge



I then viewed the live values using my BAS tool and found that one of the brake switches didn't show as open when the pedal was depressed. Then I got my camera out to video the brake lights, which turned out not to be operating. Then I checked the brake light fuse, which was blown on both 110s showing the fault. Fuse changed, fault code gone!


Click image to enlarge




Click image to enlarge


Later that day, I'm needing my trailer again. Hitched on, half a mile later, DSC light on again. Then I realised I towed the trailer with both 110s recently and that's why both were affected. By a fault with the trailer brake lights. Current Steeds:
2015 110 UW in Grasmere Green
2003 BMW F650 the Hack
2000 Elise
1992 Ducati 888 (no longer in bits, yahoo)
1990 TDR 250 (in bits again)
1988 TDR 250 (no longer in bits) and for sale
Post #1001650 25th Jul 2023 8:39am
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