Member Since: 27 Sep 2013
Location: Birmingham
Posts: 874
Brake Light Switch & Bulbs - Why The Problems?
One thing that has been puzzling me after reading numerous posts is why the brake switch or brake bulb issues can cause so many major issues with other systems?
I know they are complicated cars, but it seems very strange that a simple switch or bulb can cause a major meltdown of other systems.
Multiple systems share wiring, this is where canbus comes in, pulses are within the signal down the shared wiring which the car deciphers to follow commands, so if the brake light bulb for example is blown, the signals get interrupted to other modules sharing that wiring and hence the issues
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Last edited by beanie on 29th Dec 2016 10:50 pm. Edited 1 time in total
29th Dec 2016 10:48 pm
tayaste
Member Since: 15 May 2013
Location: Chester
Posts: 7633
If you touch the brake pedal whilst accelerating the car throws a wobbly because it doesn't know what it should be doing, sensors throwing signals that shouldn't be happening. Speed sensors increasing but brakes applied. Try it and watch the illuminations.
29th Dec 2016 10:49 pm
Luapno
Member Since: 27 Sep 2013
Location: Birmingham
Posts: 874
If you touch the brake pedal whilst accelerating the car throws a wobbly because it doesn't know what it should be doing, sensors throwing signals that shouldn't be happening. Speed sensors increasing but brakes applied. Try it and watch the illuminations.
Not a good idea, but as the throttle is fly by wire, the potentiometers that manage the throttle body / pedal sense one action, yet the brake pedal / system and the ABS speed pulse another, confusion will ensue Altox GSM FBH controller thread
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Owner of the original "Beanie" grille
D4 & RRS style D3 grilles made to order
Last edited by beanie on 29th Dec 2016 10:53 pm. Edited 1 time in total
29th Dec 2016 10:52 pm
Luapno
Member Since: 27 Sep 2013
Location: Birmingham
Posts: 874
tayaste wrote:
If you touch the brake pedal whilst accelerating the car throws a wobbly because it doesn't know what it should be doing, sensors throwing signals that shouldn't be happening. Speed sensors increasing but brakes applied. Try it and watch the illuminations.
Might give it a go
29th Dec 2016 10:52 pm
tayaste
Member Since: 15 May 2013
Location: Chester
Posts: 7633
beanie wrote:
tayaste wrote:
If you touch the brake pedal whilst accelerating the car throws a wobbly because it doesn't know what it should be doing, sensors throwing signals that shouldn't be happening. Speed sensors increasing but brakes applied. Try it and watch the illuminations.
Not a good idea, but as the throttle is fly by wire, the potentiometers that manage the throttle body / pedal sense one action, yet the brake pedal / system and the ABS speed pulse another, confusion will ensue
Oh it does.
29th Dec 2016 10:53 pm
DG Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50978
This shouldn't affect you in a D4 though as the brake lights are LED's 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
29th Dec 2016 11:05 pm
tayaste
Member Since: 15 May 2013
Location: Chester
Posts: 7633
So are mine Brake switch is the same though isn't it?
29th Dec 2016 11:19 pm
DG Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50978
Can you point me to a D4 brake switch failure ? 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
29th Dec 2016 11:36 pm
Luapno
Member Since: 27 Sep 2013
Location: Birmingham
Posts: 874
I am sure it is only a matter of time before we get a whole world of pain with the LED lights
29th Dec 2016 11:38 pm
DG Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50978
Really? We've had 7 years 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
29th Dec 2016 11:41 pm
tayaste
Member Since: 15 May 2013
Location: Chester
Posts: 7633
DG wrote:
Can you point me to a D4 brake switch failure ?
Enlighten me, why won't I be able to find a D4 failure ( I've had a quick search and nothing so far)
29th Dec 2016 11:49 pm
DG Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50978
Quote:
Enlighten me, why won't I be able to find a D4 failure
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