Adding to a factory alarm/remote start
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=79655
Printed Date: September 13, 2025 at 10:48 PM
Topic: Adding to a factory alarm/remote start
Posted By: jmz768
Subject: Adding to a factory alarm/remote start
Date Posted: June 26, 2006 at 5:14 PM
I started a topic because I was having problems finding a shop that could install an add on alarm on my 2006 Impala SS. As it turns out, this seems to be an issue with any vehicle that comes with a factory installed remote start so I think it deserves a new topic. I have a 2006 Chevy Impala SS. It comes with a factory installed security system and remote start. I thought that my vehicle was protected until I came out one morning to find my rims gone. Since the factory system doesn't include any type of shock, motion or tilt sensors it's useless in guarding against wheel theft. I've contacted five shops now as well as a couple online sources (including this one) and am getting a different answer from all of them. Here is what I'm being told. 1. I can add an alarm system but them would need to use one key fob for the alarm and one for the remote start. 2. Before remote starting I would have to disable the alarm or it would sound. 3. I can use an add on system but it will decrease the range of my factory installed remote start. 4. I can add a new alarm and remote start and not use that factory systems at all and maybe it will work. I've been going through this for 3 days now and still can't find anyone who knows what to do. Does anyone have experience with this who might be able to give me some information that I could relay to the shop? Better yet, is there anyone in the Detroit area that knows how to do it and would be interested in making some money? Thanks
Replies:
Posted By: another-kelly
Date Posted: June 26, 2006 at 6:40 PM
if it were my vehicle, i would go with door #4. you can add on an aftermarket alarm/keyless/remote start all in one (meaning one key fob) that will have 10x better range the factory alarm as well as more/easier add on options. maybe even a two way system if you park relatively close to your place
Posted By: jmz768
Date Posted: June 26, 2006 at 7:34 PM
I've thought of going that route but it has its drawbacks. First off, it's obviously going to be more expensive. Secondly I'll lose the reature of my factory remote start which automatically adjusts the climate control based on the outside temperature. Lastly, nobody can even say for sure if it will work right. I would like the added feature of a paging system so it wouldn't be all bad. I'm just frustrated as hell because I can't find anyone who has done this kind of install before. 
Posted By: another-kelly
Date Posted: June 26, 2006 at 9:24 PM
CHEVROLET / IMPALA / 2006 / Remote Start| 12volts | RED / white (10A) | + | ign harn or BCM, blue plug, pin 3 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Starter | yellow (not for remote start) | + | ECM | Notes: On the V6 models, the starter wire is in the blue plug, pin 26.
On the V8 models, the starter wire is in the black plug, pin 22.
The ECM (Engine Control Module) is behind the driver side headlight, in the air cleaner assembly.
There is a white wire and a WHITE/ black wire in the ignition harness, or the BCM, green plug, pins 2 and 4, that perform starter, second ignition, and key sense functions. No information at this time, if it is necessary to interface with these wires in addition to the PASS-key III+. | | Second Starter | N/A | | | | Ignition | pink | + | ign harn or BCM, green plug, pin 14 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Second Ignition | see starter wire notes | | | | Third Ignition | N/A | | | | Accessory | brown | + | ign harn or BCM, green plug, pin 21 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Second Accessory | N/A | | | | Keysense | see starter wire notes | | | | Power Lock | ORANGE / black | - | driver kick or BCM, gry plug, pin 12 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Power Unlock | ORANGE / black | - | driver kick or BCM, gry plug, pin 11 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Lock Motor | gray | 5wi | DKP or fuse box, 40 pin plug, pin J2 | | Notes: The fuse box is on the passenger side, end of the dash. | | Unlock Motor | tan | 5wi | DKP or fuse box, 40 pin plug, pin J3 | | Notes: The fuse box is on the passenger side, end of the dash. | | Parking Lights+ | purple (L), BROWN / white (R) | + | passenger kick, harness to rear | | Parking Lights- | BROWN / white | - | switch or BCM, white plug, pin 8 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Hazards | tan | - | switch or BCM, green plug, pin 19 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Turn Signal(L) | lt. blue/white (F), yellow (R) | + | BCM, brn plg, pin 4; brn plg, pin 1 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Turn Signal(R) | dk. blu/wht (F), dk. green (R) | + | BCM, blk plg, pin 5; brn plg, pin 2 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Reverse Light | lt. green | + | pass kick or BCM, pink plug, pin 2 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Door Trigger | see notes | - | each kick or BCM, pink plug | Notes: The LF door is gray/black in pin 10. The RF door is tan/white in pin 8. The LR door is lt. blue/black in pin 15. The RR door is lt. GREEN/ black in pin 14. Use all four wires and diode isolate each.
The BCM (Body Control Module) is to the left of the steering column. | | Dome Supervision | gray/black | + | driver kick or BCM, pink plug, pin 1 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Trunk/Hatch Pin | ORANGE / black | - | pin switch or BCM, pink plug, pin 12 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Hood Pin | pink/black | - | pin switch or BCM, blk plug, pin 17 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Trunk/Hatch Release | lt. blue | - | switch or BCM, white plug, pin 10 | Notes: The BCM (Body Control Module) is to the left of the steering column.
The trunk release motor wire is tan/white (+) at the fuse box, 40 pin plug, pin A5. The fuse box is on the passenger side, end of the dash. | | Power Sliding Door | N/A | | | | Factory Alarm Arm | factory remote only | | | | Factory Alarm Disarm | factory remote only | | | | Disarm No Unlock | with ignition and Passkey | | | | Tachometer | NOT pink/black | ac | any fuel injector | | Wait to start | N/A | | | | Brake Wire | lt. blue | + | kick panel or BCM, brown plug, pin 5 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Parking Brake | ORANGE / black | - | switch or BCM, pink plug, pin 22 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Horn Trigger | tan | - | switch or BCM, brown plug, pin 18 | | Notes: The BCM (Body Control Module) is to the left of the steering column. | | Memory Seat 1 | N/A | | | | Memory Seat 2 | N/A | | | | Memory Seat 3 | N/A | | |
 | Interface Module: | Category:
Immobilizer Bypass | Required:
Yes | Type:
PASS-Key III+ | | Part #: 556UW | | Alternate Part1 #: DesignTech 20402 | | Alternate Part2 #: DesignTech 29402 | | Notes: Standard on all models. |
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Posted By: captainzab
Date Posted: June 26, 2006 at 10:14 PM
Hey, get the Hornet 727T
its a secuirty add-on
do a search on 727 and ull find some info about on the12volt
it uses factory remote
it has shock sensor
it also has another port with prewired harness for additional sensor like tilt or glass break
You can also disarm before remote start because there is a disarm wire on this system
Easiest & cheapest way for your problem
Posted By: jmz768
Date Posted: June 26, 2006 at 10:24 PM
another-kelly I have no idea what that is, but I assume an alarm tech would...lol. Thanks a lot, I'll take that to the shop and see if it helps. captainzab That's the one I would like to get, just a matter of finding someone who carries it and knows how to install it on my vehicle. My offer still stands to anyone in the Detroit area.
Posted By: JWorm
Date Posted: June 27, 2006 at 12:29 AM
One problem a shop is going to run into is how to disarm the alarm when you activate the remote start. The Hornet alarm may have a disarm wire, but finding a wire to trigger it will be the hard part.
Posted By: jmz768
Date Posted: June 27, 2006 at 12:39 AM
JWorm] wrote:
One problem a shop is going to run into is how to disarm the alarm when you activate the remote start. The Hornet alarm may have a disarm wire, but finding a wire to trigger it will be the hard part.
Your reply leads me to believe that this may be a problem that installers are just now coming across and that it may just take time before there are systems compatible with factory remote starts. Maybe I'm just better off waiting and hoping that a couple sets of locking lug nuts will be enough.
Posted By: profuse007
Date Posted: June 27, 2006 at 12:47 PM
jmz768 wrote:
JWorm] wrote:
One problem a shop is going to run into is how to disarm the alarm when you activate the remote start. The Hornet alarm may have a disarm wire, but finding a wire to trigger it will be the hard part.
Your reply leads me to believe that this may be a problem that installers are just now coming across and that it may just take time before there are systems compatible with factory remote starts. Maybe I'm just better off waiting and hoping that a couple sets of locking lug nuts will be enough.
If i were to do this install, i would use igniton wire to power a relay to disarm the hornet 727T.
Is there any problem with this???
(nvr installed 727T on remote start system, only basic factory keyless entry) ------------- Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).
Posted By: profuse007
Date Posted: June 27, 2006 at 12:55 PM
Hey,
H2/7 Yellow/Black light flash monitor input
This input monitors the factory system light flash output and can be used as a disarm defeat wire
I assume the parking light flashes when it remote start?
if so, hook this up to the parking light wire and when you remote start it should disarm
-------------
Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).
Posted By: Chris Luongo
Date Posted: June 27, 2006 at 4:50 PM
1. Yeah, I think that'd be kinda lame.....$30k brand-new car, and having to carry two remotes.
2. No, I don't think so, at least not if it's installed with a little forethought.....see my comments below.
3. I can't imagine any way an add-on alarm would decrease the range of what you have.
Just so you know, an add-on alarm system in NO WAY gets involved with the radio transmission between your car and your existing remote.
Rather, it is wired into the wires that go to your power doorlock motors, and "watches" them........
when it "sees" the doors lock, it arms........when it "sees" ONLY the driver's door unlock, it disarms.........when it "sees" all four doors unlock at once, it does NOT disarm, because it assumes that's happening because somebody's pressing the unlock switch with a coat hanger or something.
4. I see no reason that wouldn't work, but...
A. As you said in your later post, you'll lose all the cool stuff the factory remote start does, like automatically knowing whether to turn on the heat or AC, and
B. If you expect to retain all of your factory features like trunk-pop, turning on the domelight with unlock, driver's-priority unlocking.....that's going to add a good bit more to the cost.
---------------------------------------
I'm sure the disarming-with-remote-start thing could be accomplished without too much difficulty, at least if the installer has some experience and imagination.
---The Audiovox PRO-9232A, for better or worse, is NOT triggered by the ignition being turned on, so that's not an issue.
It would be necessary, though, to wire in relay(s) to disable the shock, motion, or tilt sensors during remote start.....so the vibration of the engine wouldn't set them off.
You could also just set those sensors low enough so the the engine won't trigger them, although from what you've said about your wheels, you're probably going to want it as sensitive as possible.
---The DEI (Hornet, AutoMate, etcetera) units simply disarm themselves when the ignition is turned on, or at least they did so last time I messed with one.
---Where are you located? Near Boston by any chance?
---I did a couple of jobs today for one of the Chevy dealers I go to, and I was sitting in a Monte Carlo SS in the showroom, checking it out.
They really did a nice job on the 2006 freshening for both the Impala and Monte, and getting the V8 to fit in there is pretty awesome.
It's definitely one of the few front-drive cars I'd consider buying, and I've heard they drive really nice.
Posted By: jmz768
Date Posted: June 27, 2006 at 5:54 PM
Thanks for the reply Chris, lots of good information. Unfortunately I'm in Michigan. They are nice cars. I went with the Impala over the Monte because of the headroom. They are a nice ride but the torque steer can be pretty bad if you aren't paying attention when you accelerate from a stop. FWD is nice though living in Michigan so it's worth it. I just don't understand why car companies aren't including things like shock and motion sensors with their security systems.
Posted By: KPierson
Date Posted: June 27, 2006 at 6:15 PM
Any possibility of just wiring the shock sensor in to an existing trigger (Trunk pop, door pin, hood pin)? We've been doing that on our rice burners for years. :) The only major problem is that there isn't a warn away, full alarm only, but it works pretty well. https://g-owners.com/article_read.asp?id=43 That one uses the hood pin, and mounts under the hood, not the way I would do it, but still a good reference. ------------- Kevin Pierson
Posted By: captainzab
Date Posted: June 27, 2006 at 7:24 PM
Adding a shock sensor that way is clever and cheap. Would have never thought of it. But what if the RS causes the car to shake setting off the alarm?
Posted By: KPierson
Date Posted: June 27, 2006 at 8:12 PM
The 'trick' is in the wiring. First, you must verify that your ignition system rests at ground (test resistance between the IGN wire and ground with the key OFF). If the IGN wire rests at ground, then use it to provide the ground to the shock sensor. Hook the power wire up to 12vdc constant. Now, the shock sensor will ONLY work when the car is off, as it will only have power when the car is off. If you don't want to go that route, then simple wire a relay up to the ACC wire and use it to break the voltage (or ground) to the shock sensor. Different cars require differnt methods, but in the end it usually works great. You can pick up a genuine DEI shock sensor for dirt cheap, too! ------------- Kevin Pierson
Posted By: jmz768
Date Posted: June 27, 2006 at 8:25 PM
I like the idea of adding a sensor to the existing alarm. Looking at the information that was posted earlier in the thread about the Impala's wiring can you gather enough information on how to approach it? I'd rather go with a tilt sensor so I don't think the remote starting would be a problem.
Posted By: KPierson
Date Posted: June 27, 2006 at 9:00 PM
Well, First you need to find out what triggers the OEM alarm. On my car (Infiniti G35 coupe) the hood, the doors, and the trunk set off the alarm. However, when the doors are opened the windows drop a little bit, so that rules them out as an input. The hood pin doesn't run back in to the car, so that rules it out. The trunk pin runs in to the driver kick panel. In that case, it was obvious which wire to use, but all cars will be different, and all wiring will be different. ------------- Kevin Pierson
Posted By: jmz768
Date Posted: June 30, 2006 at 7:12 PM
What's the easiest way to get the wiring info?
Posted By: another-kelly
Date Posted: June 30, 2006 at 10:00 PM
i posted it earlier for you
Posted By: jmz768
Date Posted: June 30, 2006 at 11:27 PM
another-kelly wrote:
i posted it earlier for you
Sorry, I didn't realize that was all the information that I would need. So from that information what would be the best route for splicing in a tilt sensor?
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