Viper 791XV remote start, auto headlight

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Derekc

Member - Posts: 34

Joined: September 07, 2003

Location: United States

Posted: September 20, 2004 at 11:15 PM / IP Logged

Viper 791XV remote start + auto headlight.

I observed something and I would like to ask for your opinion.

I have a Lexus GS300 that a Viper 791XV was installed. I always have my headlight switch set to auto or on. (When set to on, it will still shut down after a minute or so after key is removed.)

The issue is the 30 sec count down of shut off of the head lights starts after you remove the key and open + close the driver door. This is the design.

Now, at night, when I remote start the engine and decide to let it run for 10 minutes and have the remote start automatically shut off. The headlight will stay on forever because it is waiting for the dirver door to open and close.

I had one or two times that I remote start the car evening time and end up decide to not go out. and let it stop. Next morning the battery dies.

Am I right explaining why the battery died? Any suggestion to prevent the car from happening?

sroth140

Silver - Posts: 513

Joined: August 27, 2003

Location: United States

Posted: September 20, 2004 at 11:44 PM / IP Logged

use a relay to inturrput the headlights. if your car is 98+ you can find the (-) trigger for the headlights relay under the steering column, RED / black. try taking one side of the RED / black to 87a and the other to 30. take the orange (-) ground when armed from the 791 to 85 and 12v constant to 86. whenever the alarm is armed the relay will break the headligh wire. so if you start it the lights will stay off, when it times out the lights will stay off.

it should work from there, but you might have to inturrupt the headlight wire somewhere else because of the auto lamps. one more thing you can try is setting the parking brake. with some cars that turns of atuo/day time running lamps.

MECP certified installer

Derekc

Member - Posts: 34

Joined: September 07, 2003

Location: United States

Posted: September 20, 2004 at 11:54 PM / IP Logged

sroth140,

Good idea but I was hoping to preserve the 30 sec delay to turning-off headlight feature for walkway Illumination. Wouldn't adding a relay to the ground-when-armed or parking brake cuts off the headlights immediately?

But still it sounds like the only solution unless I "remember" to drive the car when I remote start it after dark.

sroth140

Silver - Posts: 513

Joined: August 27, 2003

Location: United States

Posted: September 21, 2004 at 12:44 AM / IP Logged

well, if that relay worked where it was it would disable it. if you really wanted to get creative you can buy a timer relay from DEI and use a (+) or (-) trigger to run the lights from your open 4th or 5th channel. just wire that in to the 30 terminal (or 87a depending on if thats the relay or switch side)of the other relay, if you use that at all.

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Derekc

Member - Posts: 34

Joined: September 07, 2003

Location: United States

Posted: September 21, 2004 at 12:56 AM / IP Logged

I see. Thanks for the comment.

I wish I knew this issue and included it as a considering factor when I was deciding if I should add an after-market alarm to my car. Well, I am sharing this here so those who wants to install an remote start alarm with auto-headlights should include this factor.

2nd thing. Sometimes when I am sitting inside the car waiting for, say, my wife to pickup food - 5 minutes, I want to shut off the engine and keep the doors closed and listen to the radio, so I turn the key to ACC to listen to the radio. The alarm will be set after 30 sec and if I do anything like open the door or start the engine or move myself too much, it will trigger the alarm and I would be like stealing the car. How come the alarm doesn't start arming only when the key is not in ON nor ACC position? Or my installer made a mistake wiiring?? Can this be fixed or is there any work around (valet mode)?

sroth140

Silver - Posts: 513

Joined: August 27, 2003

Location: United States

Posted: September 21, 2004 at 9:47 AM / IP Logged

when its set for passive arming (arming its self after 30 sec or so) it arms when the ign is turned off. accy doesnt matter because the alarm isnt wired to watch the accy wire. you cant steal a car by turning on the accy circuit, so alarms dont have an input for that zone. they watch ign because that runs the computers and is first in line when you turn the key to crank the car, but the starter wire is cut to prevent that from happening while armed. the only thing you can do is crack a door or turn the vehicle off and press the valet button, then go to accy.

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kgerry

Platinum - Posts: 3,455

This member consistently provides reliable information

Joined: February 07, 2004

Location: Saskatchewan, Canada

Posted: September 21, 2004 at 3:47 PM / IP Logged

couldnt you just wire rearm to pulse the drivers door pin, similar to shutting down a RAP circuit?

Kevin Gerry

Certified Electronics Technician

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since 1979

JWorm

Platinum - Posts: 2,208

Joined: December 11, 2002

Location: New Hampshire, United States

Posted: September 21, 2004 at 8:12 PM / IP Logged

As kgerry said above, hooking the rearm wire to the drivers door trigger will shut off the headlights when the remote start shuts down. You might need a relay to make the pulse strong enough. Or you could just keep your headlight switch in the off position.

As far as the alarm setting when listening to the radio while your wife runs in the store....do the following.

Stop....turn car off....wife gets out and closes door. Turn key to igniton for a couple seconds, and then turn it back to accessory. As long as you don't open and close any doors, the alarm won't set.

If you happen to have domelight supervision hooked up to turn your domelight on when you shut off the ignition, the above won't work. Is domelight supervision hooked up?

And what year is your GS400?

Derekc

Member - Posts: 34

Joined: September 07, 2003

Location: United States

Posted: September 21, 2004 at 11:16 PM / IP Logged

For the auto-headlights problem:

kgerry and JWorm:

I just reread the installation guide. H2/2 Grn/White factory alarm rearm wire provides a (-) pulse when the remote start shuts down. If I use this pulse to send a door trigger, then the auto-headlights will start counting down 30 secs to turn off.

But the car is always armed for this whole process, wouldn't sending a door trigger set off the alarm? Viper 791XV remote start, auto headlight -- posted image.

Viper 791XV remote start, auto headlight -- posted image.

sroth140:

Cutting off the headlights by a relay driven by the ground-when-armed wire seems to be the answer. But I have to trace the wire so that it will go beyond the auto-headlight control. For that I have to reread the wiring diagram to see where I can add the relay. It might not have easily accessable. And needing to add a delay relay so that I can have the 30 minutes walkway illumination seems to be too complicated to the already-complicated headlights circuit.

For the "How come the alarm doesn't start arming only when the key is not in ON nor ACC position" problem,

I just tried to sit inside the car, turn the ignition on and then to ACC. Without opening up any doors, it will still count down and arm. I have no clue why. It is supposed to wait for the last door closed to start counting down to arm. I am reading the manual and still couldn't explain. JWorm, you mentioned if the domelight supervision is hooked up (YES I DO HAVE IT HOOKED UP), then it wouldn't work. I wonder why it is related to the domelight supervision.

And I have a 2000 GS300.

One more question, I have the IGNITION CONTROLLED UNLOCK turned on. Sometimes it opens all four doors, sometimes it opens only one door. Any idea??

JWorm

Platinum - Posts: 2,208

Joined: December 11, 2002

Location: New Hampshire, United States

Posted: September 21, 2004 at 11:45 PM / IP Logged

Since you have a 791XV, the rearm wire sending a pulse to the door trigger will not trigger the alarm at shutdown. If you had a 790XV, it would be a problem. The software in the 791XV will ignore any door trigger immediately upon shutdown. My method will work without problems.

I'm assuming your installer used a green wire in the car for door trigger that goes up to the domelight. It catches all 4 doors but reads the delay domelight. The wire goes between the cars ECU and the domelight.

The wire you need to hit with the REARM wire goes between the door pin switch and the ECU. That is the only way the car wil shut the headlights off. There is a different wire for each door, and I believe they can only be found in the door. The wire for the front drivers door is RED / white. If Toyota/Lexus was smart, they would have made the headlights shut off after a max time of 5 minutes.

Turning off "Ignition Controlled Domelight" in the programming for the 791XV will stop the domelight from turning on when you shut the car off. That will fix your other problem. Since the domelight gets turned on for 30 seconds without opening a door, the alarm thinks a door has been opened. After the domelight shuts off is when it starts the countdown, correct?

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