How'd I know when to use a relay?

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vbel

Copper - Posts: 246

Joined: July 15, 2004

Location: Canada

Posted: July 19, 2004 at 1:44 PM / IP Logged

I want to install a Compustar 2wss-as alarm into my 2000 prelude. How do I determine that I have to use a relay to make a certain function work? What will happen if I don't use a relay where I'm suppose to? Will it damage something or just won't work until I connect in the relay?

Velocity Motors

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Joined: March 08, 2002

Location: Manitoba, Canada

Posted: July 19, 2004 at 1:52 PM / IP Logged

Relays are used to trigger a device that requires more current than the CPU is capable of outputting. Relays are used in lots of different applications for alarm or remote start situations. If you tell us what you are trying to do with the Compstar we can tell you if it needs a relay or not.

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

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vbel

Copper - Posts: 246

Joined: July 15, 2004

Location: Canada

Posted: July 19, 2004 at 2:10 PM / IP Logged

I read the section on relays on this site, so I know the basics. But it still doesn't tell me how to check for or how to know for sure that this and this will nead a relay in order to do this and this for the function to work.

What I'm trying to do is intall the compustar alarm, which also has a remote start. I need to know basically all the connections (if I need a relay or not) I have to make for this thing to work. This is just what I could remember from the top of my head:

- 12v constant

- ignition

- accessory

- status output

- door triggers

- door lock

- door unlock

- hood pin switch

- trunk pin switch

- trunk trigger

- trunk release

- parking lights output

- tachometer input

- siren output

- horn output

- brake

- parking brake

loudsh*t

Member - Posts: 18

Joined: July 09, 2004

Posted: July 19, 2004 at 6:00 PM / IP Logged

12volts	white	+	ignition harness
Starter	BLACK/ white	+	ignition harness
Second Starter
Ignition	BLACK / YELLOW	+	ignition harness
Second Ignition
Third Ignition
Accessory	yellow	+	ignition harness
Second Accessory
Keysense
Power Lock	BLACK/ white	-
Notes: located in the passengers kick at the multiplex control unit in a blue 14 pin connector.
Power Unlock	blue/orange	-
Notes: located in the passengers kick at the multiplex control unit in a blue 14 pin connector.
Lock Motor	WHITE/ red		bottom of fuse box
Unlock Motor	lt.GREEN/ red		bottom of fuse box
Parking Lights+	RED / black
Notes: located in a white plug just behind the cruise control switch.
Parking Lights-
Hazards
Turn Signal(L)
Turn Signal(R)
Reverse Light
Door Trigger	WHITE/ black	-	bottom of fuse box
Dome Supervision	comes on with unlock
Trunk/Hatch Pin	orange	-
Notes: located in a white plug just behind the cruise control switch.
Hood Pin
Trunk/Hatch Release
Power Sliding Door
Factory Alarm Arm
Factory Alarm Disarm
Disarm No Unlock	blue	-	in drivers door
Tachometer	blue		cluster or test connector
Notes: test connector is located to the front of the right strut tower.
Wait to start
Brake Wire	WHITE/ black	+	at brake switch
Parking Brake
Horn Trigger	blu/rd or lt grn/blu	-	steering column
Memory Seat 1
Memory Seat 2
Memory Seat 3

How'd I know when to use a relay? -- posted image.

Immobilizer Bypass Module:

Required: Yes

Type: Transponder

Part #: 555D, 556U, or 555U

Best Buy Installer

tanz2004

Member - Posts: 26

Joined: July 06, 2004

Location: United States

Posted: July 19, 2004 at 6:45 PM / IP Logged

vbel wrote:

Ok here is some advise that I think might be needed. One "Automotive Alarms are Not Toys" Two "When in Doubt sub it out" In other words you can really mess up your car if you don't know how to install an alarm. One with Remote Start I would not even try and installing one without knowing how to do a Basic alarm first. Now for your question.

Parking light Flash needs a relay if not already onboard, Door Locks need relay At least 2 some times more. Dome light Supervision needs a relay, Starter Kill needs a relay. and the list goes on and on. So without the training needed to install this alarm Sub it out to a Pro.

TanZ2004

Washington State

sroth140

Silver - Posts: 513

Joined: August 27, 2003

Location: United States

Posted: July 20, 2004 at 2:33 AM / IP Logged

drivers door priority with 5wi locks :o , theres a couple relays. extra accy/ign wires, often parking lights depending on the brain. trunk pop, horn honk, rear defogger, neons, motorized doors, wipers, illuminated path (head lights), adding lock actuators, adding more sirens, motorized amp racks, ect....

basically, the brain sends out low current (-) triggers to activate relays to do heavier current jobs. such as whats listed above and then some. relays can be used to make/brake/isolate different circuits.

MECP certified installer

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How'd I know when to use a relay?

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