Remote start - Mercedes GLA Forum
 
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post #1 of 4 Old 09-17-2019, 12:00 PM Thread Starter
MMT
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Remote start

Hello
Is it possible to implement remote start to a manual gearbox?
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post #2 of 4 Old 09-17-2019, 04:25 PM
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As they say anything is possible. But it would require some type of sensors that the car is not in any gear and the park brake is set. There could be other requirement for the to work. Like are doors locked, amount of fuel in tank, possible distance from remote and car and maybe a few items.

2019 GLA250 Black/Black replaced 2016 GLA250 Black/Black
Second car 2007 SLK350 Black/Black
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post #3 of 4 Old 09-17-2019, 04:38 PM
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Done it before

Most reliable way in my opinion, is to route the clutch sensor through the shifter via reed switch. I’ll explain.

Your car starter motor won’t work because it is interlocked to the clutch. You can ground out the clutch and the remote start will work normal. But that’s a bad idea IMO because you have to remember to keep the car in neutral, and also you can start the car in gear with the key too. It’s just a bad idea all around.

So what you can do is ground out the clutch through a reed switch that is active only when the car is in neutral. You do that by installing the reed switch in the center console next to the shift lever, and epoxying the magnet to the rod of the shifter. Tune it until the switch is met in neutral, but not in first or reverse.

For the wiring, you ground one end of the wire locally, then route the other wire to the clutch sensor and tap it in to the right wire.

The net result is that the car doesn’t know the difference between a depressed clutch, or the car in neutral. Either case, the car will start. Key or remote.

More importantly, when the car is in gear, then the clutch sensor will prevent the car starting, key or remote.

There are other ways to do it I am sure, but none as elegant, simple, and safe as this way. If there is, I haven’t heard of it yet...
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post #4 of 4 Old 09-17-2019, 05:11 PM
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If you want to sense the e-brake too, no problem. Instead of grounding out the reed switch that is connected to the clutch, connect it to your e-brake. Thus, ground will not be supplied unless the e-brake is set.

That way, you need to be in neutral AND with ebrake set to bypass the clutch. Otherwise, the clutch sensor will disallow crank, key or remote start.
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