EHCS Limit sensor replacement? - BMW Luxury Touring Community
 
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post #1 of 6 Old Mar 11th, 2014, 6:57 am Thread Starter
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EHCS Limit sensor replacement?

Hello,

My EHCS has decided to stop working - the warning light was on permanently which the handbook said meant the centre stand was fully extended. This of course stops the actuator working...

The proximity sensor is corroded to hell so no surprises that it was failed, but it appears that there is no part available from BMW... does anyone know what the impedence of a working sensor should be when the stand is not fully extended? I could just make up a "blank" for the harness to keep it working and rig an alternative sensor elsewhere in the circuit. Better still a compatible sensor could take its place - any suggestions gratefully received.
Cheers
Laurie
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post #2 of 6 Old Mar 11th, 2014, 4:41 pm
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Re: EHCS Limit sensor replacement?

Pardon me Laurie but explain me more about your proximity switch. Where is that located? The only electrical connection to the EHCS is the (heavy) power feed connector and it only provides power to the pump motor.
However there are some other conditions that are being checked before the EHCS gets power to the motor. Gear in neutral, side stand up, no brakes applied, I guess these are all? But the proximity switch telling that the stand is down..? Never seen one.

Regards

Ari "the Farkle-Freak-Finn" Ignatius

Hyvinkää, Finland
2004 ('05) LT, Dark Graphite, "Sunset Cruiser II"

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post #3 of 6 Old Mar 11th, 2014, 7:05 pm
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Re: EHCS Limit sensor replacement?

The part is listed as "Hall Sensor" and is quite pricey.
61 31 7 680 682 HALL SENSOR 0.22 1 $105.34

Number 8 on the diagram.

Here is a picture on the bike for Ari. It mounts with the screw and nut. And it signals the controller to stop running the pump when the stand deploys and it also commands the warning light on the dash to steady.
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John
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post #4 of 6 Old Mar 12th, 2014, 12:50 am
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Re: EHCS Limit sensor replacement?

Thanks John! This was very educative. Now that you explained it, it is obvious... Of course the pump stops when the stand is down!

Regards

Ari "the Farkle-Freak-Finn" Ignatius

Hyvinkää, Finland
2004 ('05) LT, Dark Graphite, "Sunset Cruiser II"

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post #5 of 6 Old Mar 17th, 2014, 2:55 am Thread Starter
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Re: EHCS Limit sensor replacement?

John you are an absolute star!

My BMW dealer recently sent an email saying:

"Hi Laurie

None of those part numbers mean anything on the BMW ETK parts system.

The new actuator has turned up and it just has a bloomin big bunch of wires on it and no micro switch.

Am stuck at the moment."

The numbers they were referring to are the numbers listed on the wire casing by the manufacturer (Pico). I have copied your info to him and await his reply. If I can't get the part through him I can get in LA which I visit a couple of times a month with work... A huge "thank you" John.
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post #6 of 6 Old Mar 17th, 2014, 4:29 am Thread Starter
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Re: EHCS Limit sensor replacement?

Yep - BMW dealer can find it using your part number - similar price in UK - and it is on order.

I wonder why they made it so hard to find?
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