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SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

Gas pedal "button" at the end

 
Old 05-02-2019, 07:04 PM
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2005 SL500
Gas pedal "button" at the end

Out of curiosity a question that have been keeping me thinking for a while:

Has anyone felt something like a "button" at the end when you floor the gas pedal? And if it is a button, what is it for? is it supposed to sort of rev up and downshift? Considering i don't floor it often i ran into that recently when was playing with the pedal.
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Old 05-02-2019, 07:56 PM
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SL55, S500
Lol, thatís the kickdown button it shifts to the lowest gear for a proper wot
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Old 05-02-2019, 07:57 PM
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do they go bad? because nothing happens when i press it
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Old 05-02-2019, 08:13 PM
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Originally Posted by Ghostty View Post
do they go bad? because nothing happens when i press it
it should throw you in your seat and accelerate as hard as possible
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Old 05-02-2019, 09:08 PM
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The kickdown switch is held in place with snaps and is easily removed/replaced. If it is unavailable as a new part, you can certainly get a working switch out of another pedal.
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Old 05-02-2019, 10:33 PM
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In the "old days", that button actually caused an extra spray of oil into the engine for help with hard acceleration. Now, it's just a "max throttle" trigger.
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Old 05-02-2019, 10:46 PM
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Does anyone know what's the correct name? When i drive and depress the pedal literally nothing changes, it keeps accelerate at the same rate, no downshifting either...


Or i should start with a scan of the car?

P.S.

Could the SprintBoost affect the way the delimiter works?

Last edited by Ghostty; 05-02-2019 at 10:59 PM.
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Old 05-02-2019, 11:59 PM
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Looked up the accelerator pedal - about $200, not too expensive. Might replace the whole assembly if needed. But will start with scanning for sure.
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Old 05-03-2019, 10:59 AM
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Originally Posted by Ghostty View Post
But will start with scanning for sure.
I presume you would use DAS to see the actual values associated with the transmission controller, and these would include the kickdown switch, I presume. Otherwise, simply remove the switch from the pedal assembly and check its switching acting with a resistance reading across its pair of electrical contacts.
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Old 05-03-2019, 03:21 PM
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All my cars are blown! '11 E350 Diesel P2 Sport; '03 SL55 AMG Pano
Guys - I'm pretty sure the button is not connected to anything...it is just a button with feedback that you are WOT.
I've taken a pedal apart, including the potentiometer for the throttle, and the button had no wiring to it. I wish I could find the pictures to share
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Old 05-03-2019, 04:14 PM
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Originally Posted by kbob999 View Post
Guys - I'm pretty sure the button is not connected to anything...it is just a button with feedback that you are WOT.
Well that would be reaaaaally weird for a button with no connection 😂 but what we, mortals, know about German engineering!
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Old 05-03-2019, 04:27 PM
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Does anybody know the design in safety for the throttle, say the potentiometer goes faulty in a way it accellerates max and could catch you off guard-?
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Old 05-03-2019, 05:45 PM
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Originally Posted by Moto_Guzzi View Post
Does anybody know the design in safety for the throttle, say the potentiometer goes faulty in a way it accellerates max and could catch you off guard-?
That should be impossible. I don't know about Mercedes, but the GM drive by wire system are triple redundant. You'll maybe get like two 5 volt references that run one high to low and another low to high plus a resistance reference. If all three of their graphs don't match up with the pedal position, the computer goes into limp mode. I did an LS swap in a boat and had to extend the harness out of the pedal to run the drive by wire. It was a lot of wires, I think there were 9 wires total from the pedal to the interface box ,and that was easy way to go.
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Old 05-03-2019, 08:01 PM
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Originally Posted by kbob999 View Post
Guys - I'm pretty sure the button is not connected to anything...it is just a button with feedback that you are WOT.
I've taken a pedal apart, including the potentiometer for the throttle, and the button had no wiring to it. I wish I could find the pictures to share
I believe this is correct. Last year I replaced my accelerator pedal, and thoroughly tore down the old pedal so I could understand how it functioned. In fact I've got that spring loaded button assembly sitting in front of me as I type. There is noting under that button but a spring.

It seems the only function of that button is to give tactile feedback that you have reached wot.
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Old 05-03-2019, 11:20 PM
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I have a SprintBooster and the way it remaps the accelerator, I never make it to the kickdown button - I'm already accelerating fast enough before I make it that far. Like I said, the kickdown button is just a leftover "throwback" to the old days. Honestly, I am surprised MBZ still spends the money to install them.
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Old 05-03-2019, 11:26 PM
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The kickdown button is an electrical switch: K16/6. The Electronic Troubleshooting manual implies it is wired with all M113-powered cars but perhaps not others.

Last edited by bobterry99; 05-04-2019 at 12:06 AM.
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Old 05-05-2019, 11:36 AM
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Originally Posted by bobterry99 View Post
The kickdown button is an electrical switch: K16/6. The Electronic Troubleshooting manual implies it is wired with all M113-powered cars but perhaps not others.
Good info! So some pedals have a switch, and some have a button that does nothing!
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Old 05-05-2019, 01:50 PM
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Ok, so considering you guys own 550 or 55 models and i have a 500 there is still a possibility that mine is connected to something. I will check somehow and post back. Don't know if it will be soon since my next long weekend lands on my trip to Germany...
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