Brake override system failure
Thread Starter
Advanced
Joined: May 2018
Posts: 653
Likes: 96
From: PA
Brake override system failure
Noticed that in the last month the brake override system failure light came on twice and the car dropped speed (60mph to 5mph) within seconds. Anyone have experience with this phenomenon? What have you learned.
Lexus Test Driver
Joined: Feb 2017
Posts: 6,260
Likes: 1,752
From: Richmond Hill, Ontario, Canada
Did the message say there was a malfunction and to take it to the Dealer?
Your description of the speed dropping sounds like the system was activated, rather than malfunctioning.
If it did give you a malfunction warning, then checking some basics like the battery or any aftermarket electrical accessories would be a good place to start.
Your description of the speed dropping sounds like the system was activated, rather than malfunctioning.
If it did give you a malfunction warning, then checking some basics like the battery or any aftermarket electrical accessories would be a good place to start.
Moderator
Joined: Nov 2016
Posts: 9,612
Likes: 4,801
From: GA
Did the message say there was a malfunction and to take it to the Dealer?
Your description of the speed dropping sounds like the system was activated, rather than malfunctioning.
If it did give you a malfunction warning, then checking some basics like the battery or any aftermarket electrical accessories would be a good place to start.
Your description of the speed dropping sounds like the system was activated, rather than malfunctioning.
If it did give you a malfunction warning, then checking some basics like the battery or any aftermarket electrical accessories would be a good place to start.
Thread Starter
Advanced
Joined: May 2018
Posts: 653
Likes: 96
From: PA
Did the message say there was a malfunction and to take it to the Dealer?
Your description of the speed dropping sounds like the system was activated, rather than malfunctioning.
If it did give you a malfunction warning, then checking some basics like the battery or any aftermarket electrical accessories would be a good place to start.
Your description of the speed dropping sounds like the system was activated, rather than malfunctioning.
If it did give you a malfunction warning, then checking some basics like the battery or any aftermarket electrical accessories would be a good place to start.
Moderator
Joined: Nov 2016
Posts: 9,612
Likes: 4,801
From: GA
Lexus Test Driver
Joined: Feb 2017
Posts: 6,260
Likes: 1,752
From: Richmond Hill, Ontario, Canada
The ECM interprets this as the driver attempting to slow a vehicle that is uncontrollably accelerating, so it returns the throttle body flap to the idle position, therefore allowing the brakes to bring the vehicle to a stop.
You can simulate this by driving down the road...where it's safe (can't stress that enough), and while you are still pushing the accelerator, use the other foot and press the brake.
You have to be at some significant speed for the override to kick in.
So why would this activate if you weren't doing the above steps? Most common cause is big shoes/feet hitting both pedals without you realizing.
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Lexus Test Driver
Joined: Feb 2017
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From: Richmond Hill, Ontario, Canada
I should have suggested that it may have been the mat too, since about 10 years ago this was a hot topic for Toyota when people used aftermarket mats, especially in the winter.
They resolved that issue in 2012 by selling all vehicles with carpet and all weather mats...which can both be secured to the tabs in the footwell floor, therefore never interfering with the pedals.
Of course this is in Canada, so I'm not sure if they did this in a ll regions...especially if you don't have traditional winter.
Pole Position
Joined: Apr 2018
Posts: 2,626
Likes: 459
From: GA
Is it a Lexus mat or aftermarket?
I should have suggested that it may have been the mat too, since about 10 years ago this was a hot topic for Toyota when people used aftermarket mats, especially in the winter.
They resolved that issue in 2012 by selling all vehicles with carpet and all weather mats...which can both be secured to the tabs in the footwell floor, therefore never interfering with the pedals.
Of course this is in Canada, so I'm not sure if they did this in a ll regions...especially if you don't have traditional winter.
I should have suggested that it may have been the mat too, since about 10 years ago this was a hot topic for Toyota when people used aftermarket mats, especially in the winter.
They resolved that issue in 2012 by selling all vehicles with carpet and all weather mats...which can both be secured to the tabs in the footwell floor, therefore never interfering with the pedals.
Of course this is in Canada, so I'm not sure if they did this in a ll regions...especially if you don't have traditional winter.
Lexus Test Driver
Joined: Feb 2017
Posts: 6,260
Likes: 1,752
From: Richmond Hill, Ontario, Canada
Let me clarify what I was trying to say...as the cars were only shipped with the carpet mats, people would just buying cheap aftermarket mats for winter that did not have the holes to use the locking tabs with.
Eventually the mats would ride up and get caught in the pedals...hence creating the problem.
So in 2012 Toyota provided, along with the traditional carpet mats, a set of the all weather mats that you would have traditionally had to purchase for an additional cost from the dealer.
Effectively cars were coming with 2 sets of mats...carpet and the rubberized all weather.
Once owners were swapping between the mats each season, and using the locking tabs each time, there shouldn't have been any further mat issues.
Eventually the mats would ride up and get caught in the pedals...hence creating the problem.
So in 2012 Toyota provided, along with the traditional carpet mats, a set of the all weather mats that you would have traditionally had to purchase for an additional cost from the dealer.
Effectively cars were coming with 2 sets of mats...carpet and the rubberized all weather.
Once owners were swapping between the mats each season, and using the locking tabs each time, there shouldn't have been any further mat issues.
Rookie
Joined: Oct 2018
Posts: 70
Likes: 18
From: KY
At your 5k and 10k services at Lexus one of the checkpoints for the visit is to actually ensure the mat is properly fitted as it should be. I assumed it was for the accelerator pedal but I guess it could be for the brake as well. Especially if your ShrinkDoc 