Thread: SLS Remote

Hi Graeme,

The wire needs cutting because of this:

The BCU (body control unit ECU) outputs a continuous square wave with a 50% duty cycle to the SLABS ECU - this is the 'no signal received from the suspension remote'

When the BCU receives an up or down request from the remote it changes the duty cycle of the signal to either 75% or 25% respectively.

So even when there's no signal from the remote there is still a continous signal on that wire from the BCU.

In order to 'take over' from the BCU in providing that signal, it's necessary to disconnect it from the SLABS ECU otherwise the signals would interfere horribly.

The PIC on the circuit board in the kit produces this signal continuously and modulates the duty signal when you press the switch up or down.

Have you verified that the 50% signal exists if the BCU is not enabled for SLS remote use?

I have, yes, and it is present.

David

So that will be the reason my attempt failed, not having access to a vehicle to discover there's an existing signal and trying to over-ride it by imposing the 25%/75% signals. I didn't find any reference to the duty cycles percentages employed so tried 25% & 75% then all 10% steps then all 5% steps, all to no avail. At least someone has provided an inexpensive switchable facility in lieu of the expensive remote.

Originally Posted by Graeme

So that will be the reason my attempt failed, not having access to a vehicle to discover there's an existing signal and trying to over-ride it by imposing the 25%/75% signals. I didn't find any reference to the duty cycles percentages employed so tried 25% & 75% then all 10% steps then all 5% steps, all to no avail. At least someone has provided an inexpensive switchable facility in lieu of the expensive remote.

We were close...

But not close enough! I didn't find references to the duty cycles used in Rave but possibly they're there somewhere.

Mine arrived today in the mail. Thanks Dave.

Great - let me know how you get on with it!

David