Fitting ESP lateral acceleration sensor to W208 CLK

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tjj23

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Hi

I've got the BAS/ESP light which came on intermittently and is now staying on almost all the time. I tried replacing the brake light switch after reading other posts but this didn't make any difference. So I took it to get diagnosed and it looks like it is the ESP lateral acceleration sensor that has failed. Its a 2001 W208 CLK 200K.

Does anyone know where this is located and whether it is easy to replace at home?

Thanks
 

television

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See what I can find
 

5pares

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I beleive its in the boot and theres a roadtest routine that has to be done,something like pressing the traction button for a few seconds,then driving straight for a few yards then turning sharply,not much help i know.
 

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I beleive its in the boot and theres a roadtest routine that has to be done,something like pressing the traction button for a few seconds,then driving straight for a few yards then turning sharply,not much help i know.

This is one thing that I have never found yet on the 208 or 203 dont know where it is in WIS
 

Miffy

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its not the same thing thats used to detect the back of the car lifting is it?

Looking at starfinder, the lateral sensor needs to be checked at n47-5, ignition on, measure voltage at pin 1.24 = 5V, and if lateral movement is performed, then pin 1.23 should be > 10mvAC
 
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It is the pendulum thing that knows when the car is slewing
 

Miffy

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WIS describes its location as

in the front of the trunk under the cover B24/2 document gt42.45-p-4700-03c

if you can find it, it looks like it has just 2 bolts securing it, and a multiplug
 
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television

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WIS describes its location as

in the front of the trunk under the cover B24/2 document gt42.45-p-4700-03c

if you can find it, it looks like it has just 2 bolts securing it, and a multiplug

Thank you so the OP can get to it fairly easy
 

Miffy

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Thank you so the OP can get to it fairly easy

would seem so, but I cant really picture where it is exactly for the other models its a real pic so you can get your bearings, but wis shows just a simple line drawing for the 208
 

Alex Crow

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lateral acceleration sensor is indeed in the boot, under plastic panel at the front. not to be confused with yaw rate sensor - similar looking in same location.

you should find the sensor is `plug and play` if you'll pardon the expression. these do fail and we have changed a few.

these two sensors give the esp information about the vehicles changing attitude in the direction travelled, along with wheel speed and steering angle sensors. all in all a very clever bit of kit and something i think mercedes should be very pleased about, a genuinely effective safety measure. i hope everyone has tried theirs out?
 

Miffy

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lateral acceleration sensor is indeed in the boot, under plastic panel at the front. not to be confused with yaw rate sensor - similar looking in same location.

you should find the sensor is `plug and play` if you'll pardon the expression. these do fail and we have changed a few.

these two sensors give the esp information about the vehicles changing attitude in the direction travelled, along with wheel speed and steering angle sensors. all in all a very clever bit of kit and something i think mercedes should be very pleased about, a genuinely effective safety measure. i hope everyone has tried theirs out?

Can you be a bit more precise as to where it is, as the image on WIS makes it look as though it could be anywhere :)

Seeing as I have a 208 I might as well locate mine "just in case"
 

Alex Crow

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open the boot, remove carpet on floor pan to expose spare wheel. forward of the spare wheel well you will see a large plastic cover, the full width of the boot. remove this cover and there is very little fitted beneath apart from the esp sensors.
 

Miffy

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open the boot, remove carpet on floor pan to expose spare wheel. forward of the spare wheel well you will see a large plastic cover, the full width of the boot. remove this cover and there is very little fitted beneath apart from the esp sensors.

Thanks, ill have a look as soon as I get the chance :) but I dont recall anything in that area, I have the anti tilt sensor to the left of the wheel, fuse box to the far right, and thats about it, "i think"
 

Alex Crow

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forward of all that. very big cover, hard to miss, sits in the horizontal plane and goes to the very front of the boot area.
 

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If you have electric seats Mark, the main power relay for them is also there, the plastic cover is secured by 3-4 large headed plastic screws, 208 is the same layout as a 202.
 
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tjj23

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Thanks guys! :) I just got back from a weekend away to find all the replies.

I bought the sensor and it was indeed located under the plastic panel in the boot beyond the spare wheel in the location with the yellow circle. To fit I gently levered up the clip on the connector pulled the connector off and then levered up the metal cage. Easy! Took about 5 mins.
And the BAS/ESP light has gone off and hopefully it'll never come back :p

That has saved me some money especially as the guy in the local garage reckoned it was in the centre console and would take 2 hours to install. Suspicious....

Tom
 

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