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URC Relay Question
This thread has 20 replies. Displaying posts 1 through 15.
Post 1 made on Friday January 4, 2019 at 22:25
piker
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Hi,

I'm new to working with relay outputs and am looking for some assistance.

What I have is a URC MRX8 in my personal system. I have a remote for my remote starter in my car that I have soldered leads onto the start button contacts. When I touch the leads together it triggers the start button and my car starts.

What I want to do is wire these leads to the relay output on the MRX8 and program the output to start my car. The main reason I want to do this is to program it so I can use my Google assistant to start my car.

The problem I have is that having never worked with the relay output before I'm not sure how to wire it or how to program it. I can do everything else and am very proficient with accelerator I'm just not sure about the relay portion.

If anyone could offer any guidance I'd sure appreciate it!

Also I am an authorized dealer and could go through URC tech support but I thought this might be a better spot for this particular question.

Thank you in advance to anyone who can help!
Post 2 made on Friday January 4, 2019 at 22:30
Duct Tape
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you will use the COM and the NO connections  (common and normally open)

then program the relay to turn on momentarily.  .3 seconds should be good enough.

I've thought about doing what you are doing many times, but I have been too lazy to install a remote starter in my truck though I used to do that sort of work for over 10 years :)
[Link: facebook.com]
OP | Post 3 made on Friday January 4, 2019 at 22:58
piker
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Perfect, thank you I really appreciate the help!
Post 4 made on Saturday January 5, 2019 at 10:15
highfigh
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On January 4, 2019 at 22:25, piker said...
Hi,

I'm new to working with relay outputs and am looking for some assistance.

What I have is a URC MRX8 in my personal system. I have a remote for my remote starter in my car that I have soldered leads onto the start button contacts. When I touch the leads together it triggers the start button and my car starts.

What I want to do is wire these leads to the relay output on the MRX8 and program the output to start my car. The main reason I want to do this is to program it so I can use my Google assistant to start my car.

The problem I have is that having never worked with the relay output before I'm not sure how to wire it or how to program it. I can do everything else and am very proficient with accelerator I'm just not sure about the relay portion.

If anyone could offer any guidance I'd sure appreciate it!

Also I am an authorized dealer and could go through URC tech support but I thought this might be a better spot for this particular question.

Thank you in advance to anyone who can help!

One major thing that makes this different from a regular remote start is that it receives no tach info and that means it could still crank when the engine is already running.

Make sure you use a Bosch-style 30A relay for the actual connection to the starter wires and that you connect to the Crank wire for your car. If the relay duration isn't variable, I would consider using a normal remote start. There's a difference between crank RPM and Run RPM and the brains need to know when it's doing one or the other.

Viper has one that is controlled via iPhone or Android, for $200 and it allows tracking of the vehicle.

[Link: viper.com]

I installed keyless entry in my Astro and it reminded me why I'm so happy that I no longer do that kind of work. It also reminded me why I had a bad back for 20 years.
My mechanic told me, "I couldn't repair your brakes, so I made your horn louder."
Post 5 made on Saturday January 5, 2019 at 11:29
Ernie Gilman
Yes, That Ernie!
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On January 4, 2019 at 22:30, Duct Tape said...
then program the relay to turn on momentarily.  .3 seconds should be good enough.

If you never have to crank longer than that and you don't ever have to push on the gas pedal. Not even in the dark of winter.

On January 5, 2019 at 10:15, highfigh said...
One major thing that makes this different from a regular remote start is that it receives no tach info and that means it could still crank when the engine is already running.

Yeah. You gotta love the sound that makes!

Plus, sorry, URC, but I wonder if URC RF products are so perfect that you want to drive around with one of them powered up, just ready to crank your starter if you happen to drive into some squirrely RF situation out on the road.

Plus, at some point, some weisenheimer is going to ask just how you figure to turn the ignition on in the first place before you crank the starter. It's not good enough to just crank. The ignition needs to be able to be turned on first. And do you want a URC receiver sitting out in the wild with a relay that could turn on your ignition and leave it on? Say... overnight?

I'd look into products specifically made to do just this. I bet their warranties make using a URC piece look a bit scary. For instance, as highfigh says,

Make sure you use a Bosch-style 30A relay for the actual connection to the starter wires and that you connect to the Crank wire for your car. If the relay duration isn't variable, I would consider using a normal remote start. There's a difference between crank RPM and Run RPM and the brains need to know when it's doing one or the other.

Viper has one that is controlled via iPhone or Android, for $200 and it allows tracking of the vehicle.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 6 made on Saturday January 5, 2019 at 11:58
rbhfan
Active Member
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634
Pretty sure he was wiring the contact closure to an actual remote start key fob not the starter wires themselves. I also did remote starters for over ten years and I as can assure you ,there is a lot more to worry about then just touching the start wires together regardless of how many times the fast and the furious get it to work
One thing I have learned in this industry. It is easier to pull a wire than it is to push one.
Post 7 made on Saturday January 5, 2019 at 14:28
highfigh
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On January 5, 2019 at 11:29, Ernie Gilman said...
If you never have to crank longer than that and you don't ever have to push on the gas pedal. Not even in the dark of winter.

Yeah. You gotta love the sound that makes!

Plus, sorry, URC, but I wonder if URC RF products are so perfect that you want to drive around with one of them powered up, just ready to crank your starter if you happen to drive into some squirrely RF situation out on the road.

Plus, at some point, some weisenheimer is going to ask just how you figure to turn the ignition on in the first place before you crank the starter. It's not good enough to just crank. The ignition needs to be able to be turned on first. And do you want a URC receiver sitting out in the wild with a relay that could turn on your ignition and leave it on? Say... overnight?

I'd look into products specifically made to do just this. I bet their warranties make using a URC piece look a bit scary. For instance, as highfigh says,

It would need a group of relays to handle all of the power switching, then hand off to the car when the driver gets in with the key. The typical remote start units have IGN, Crank, heater, brake light switch, tach and other connections, to make sure the engine and vehicle aren't damaged. The brake switch input is for killing the engine if someone pressed the pedal without turning the key to Run. Also, the manufacturers usually state clearly that these are not to be installed in vehicles with manual transmission because the neutral safety switch can fail or be defeated, as in the example given by the Alpine trainers.
My mechanic told me, "I couldn't repair your brakes, so I made your horn louder."
Post 8 made on Saturday January 5, 2019 at 14:30
highfigh
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On January 5, 2019 at 11:58, rbhfan said...
Pretty sure he was wiring the contact closure to an actual remote start key fob not the starter wires themselves. I also did remote starters for over ten years and I as can assure you ,there is a lot more to worry about then just touching the start wires together regardless of how many times the fast and the furious get it to work

Even if he just wants to use his cell phone to start the engine, there are better ways than cobbling it together with a URC piece. Or, is this specifically to be a way to use the control system for the house as a way to start the engine?
My mechanic told me, "I couldn't repair your brakes, so I made your horn louder."
Post 9 made on Saturday January 5, 2019 at 18:42
Brad Humphrey
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Dear Lord!!!!!!
He said he HAD a remote start system in the vehicle already!!!!!! So there is ALREADY a brain in the vehicle that manages the power, starting, engine running, all that!
There is no worry of the thing starting when you don't want it to, starter engaging when it is already running, etc., etc., etc.

All he needed was a question answered about a relay contact from URC, to trigger the remote RF transmitter - that is 'already' part of his remote start vehicle system. That was answered in post #2.
Post 10 made on Saturday January 5, 2019 at 19:20
davidcasemore
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On January 5, 2019 at 18:42, Brad Humphrey said...
Dear Lord!!!!!!
He said he HAD a remote start system in the vehicle already!!!!!! So there is ALREADY a brain in the vehicle that manages the power, starting, engine running, all that!
There is no worry of the thing starting when you don't want it to, starter engaging when it is already running, etc., etc., etc.

All he needed was a question answered about a relay contact from URC, to trigger the remote RF transmitter - that is 'already' part of his remote start vehicle system. That was answered in post #2.

Agreed. The last post in this thread should have been #3 where the OP thanks Post #2
Fins: Still Slamming' His Trunk on pilgrim's Small Weenie - One Trunk at a Time!
OP | Post 11 made on Saturday January 5, 2019 at 20:10
piker
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Yes, I have an actual Viper remote starter that is being installed in the vehicle, I just needed to know how to wire and program the leads that were soldered onto the spare FOB to use my URC system to trigger the start button on the FOB.

Thanks again for all the advice!
Post 12 made on Sunday January 6, 2019 at 01:44
Ernie Gilman
Yes, That Ernie!
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On January 5, 2019 at 18:42, Brad Humphrey said...
Dear Lord!!!!!!
He said he HAD a remote start system in the vehicle already!!!!!! So there is ALREADY a brain in the vehicle that manages the power, starting, engine running, all that!

Yup. You're totally right.
All he needed was a question answered about a relay contact from URC, to trigger the remote RF transmitter - that is 'already' part of his remote start vehicle system. That was answered in post #2.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 13 made on Sunday January 6, 2019 at 09:46
highfigh
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Sure wish I had read the second paragraph........

How will you maintain network connection?
My mechanic told me, "I couldn't repair your brakes, so I made your horn louder."
Post 14 made on Sunday January 6, 2019 at 19:13
Brad Humphrey
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On January 6, 2019 at 09:46, highfigh said...
Sure wish I had read the second paragraph........

How will you maintain network connection?

Follow along...
One of the extra transmitters (for the remote start system on his vehicle) is going to be hard wired to his URC MRX8 processor in his home.
This will allow him to use his home automation system to remote start his vehicle. From a URC remote or by voice thru a Google device (which is what he mentioned doing).
This can only work at his home (where the key FOB is hard wired at), within range of the key FOB (which should be several hundred feet).
Post 15 made on Monday January 7, 2019 at 11:12
Ranger Home
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On January 6, 2019 at 19:13, Brad Humphrey said...

within range of the key FOB (which should be several hundred feet).

Nice! Do they really work THAT far? That's great if it does.
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