Thread: Anyone with SLS & remote?

I thought that this was a factory only option

very keen to know how you go however

more interest here too---

I have SLS and remote, but don't have acces to the multimeter

The BCU controls the fob encoding and the SLS light actuation but ultimately is in communication with the SLABS. The SLABS controls the compressor, height sensors, valves etc and is where SLS is activated.

If you can get something working I'm sure there's a lot of D2 owners who would be interested.

The BCU passes the up or down indication in a fixed frequency 25 Hz pwm signal from the RF receiver to SLABS on a dedicated wire whilst a remote's button is pressed and the BCU's conditions are met. The up or down indication therefore has to be the use of different duty cycles, being the only other variable for a pwm signal.

Knowing whether it is a 5V or 12V based signal is necessary to be sure of avoiding damage to the SLABS ecu. The voltage can only be determined by observing the voltage whilst the remote is lowering or raising the vehicle. Testing using a 5V signal can't cause damage but may not produce any results. The voltage can be assumed from either using a digital volt meter and observing some instances of voltages above 5V whilst using the remote or from using an analogue volt meter and obvserving the maximum smoothed voltage during lowering or raising, as the maximum voltage should be well above 5V if the signal uses 12V. Note that the vehicle speed signal which is produced by the SLABS ecu is a 12V-based pwm signal, not that this is any indication that the lower/raise signal is also 12V.

Knowing the duty cycle of the individual up and down signals would avoid having to possibly do numerous trials using different duty cycles, although I have reasoned a starting point. A pwm-capable multimeter would show the duty cycle of the current signal.

A test module using 5V is ready to be sent for testing by the AULRO member who triggered my quest to provide a cheap alternative to the remote.

Edit: I've discovered that the 5V pwm output from the test module is recognised by my ACE speed signal modifier that inputs SLABS's 12V pwm speed signal. This indicates that supplying a 5V pwm signal in place of what's normally a 12V pwm signal from the BCU may be sufficient. Frequency and duty cycle are the pwm signal's main criteria when used for coded messages so I'm not particularly surprised.

Originally Posted by Pedro_The_Swift

more interest here too---

me too. I would like it just so I can.

me to,will allow me to access the shed

It may take a few weeks to work through the variables, finding test time and posting bits back and forth but within a month there may be something positive to report. I have 4 more options ready to test but will wait until the first test is done as any result may influence what will be tested next.