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Discussion Starter #1
I love my '05, but whenever I open the door, it honks intermittently at me until I turn the key. My chevy dealer said that I need to use the remote, but it's toast, and I don't really want to pay him $72 for a replacment.

There's a sticker on the driver's side window that says that the car has a security system, but I don't know if it's factory or aftermarket. The sticker is gray with black letters.

Any help would be greatly appreciated.
 

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Have you tried turning the key twice to unlock, this should de-activate the alarm.
 

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I don't think turning the key twice will do it. We have an 05 and the same situation and I could never get it to disarm with the key, we eventually got remotes programmed. If you lock the car with the power lock button, it arms the security system and you will get the honking when you get in. If you manually lock the car it will not arm and won't honk when you unlock the door.

Let me know if you figure out how to disarm it with just the key, I couldn't figure it out.
 

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Great thoughts. I had a similar problem with my 2008 when the key FOBs died. If you lock the car (assuming it's power locks) by pressing the lock button on the door twice, the alarm will not arm. This helped me out until I pulled out the soldering gun and fixed the loose battery holder. Cheers!
 

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Discussion Starter #6
Thanks for the suggestions. I'll try them. I had a couple ideas for crude but effective fixes:

Is the alarm on a dedicated fuse? If so, which number, and would removing the fuse shut off the alarm without impairing operation?

Could I just disconnect the horn? Other horns I'm familiar with just have a
push-pull connector.

In my original post, I questioned whether it was a factory or after-market system. I'm thinking now that it is factory, since I have the blinking padlock&car icon flashing on my dash when the system is active.
 

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I got my Cobalt about 2 months ago, and first day took it for an oil change, etc. They reported that the horn didn't work.

I started looking into it, and, hmm...maybe the fuse is blown. There was no fuse installed in the horn slot. There was a spare in the fuse block, so I installed it. Horn works great! So does the security system that honks the horn if you don't get the car started soon enough if your key fob doesn't work!

I pulled the fuse again for now. I finally found the key fob in the car, but even after replacing the batteries in it, it doesn't seem to work.
 

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There must be a guy like me in your neighbourhood that repairs these for 10-20 bucks.
 

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Don't know if this will help you or not!!!

Content Theft Deterrent (CTD) Description and Operation
The CTD system, when armed, is designed to deter vehicle content theft by pulsing the horns and exterior lamps for approximately 2 minutes when an unauthorized vehicle entry is detected. However, the CTD system does not affect engine starting.

An unauthorized entry can be any of the following with the CTD system armed:

• When any door is opened without being unlocked by using the keyless entry transmitter to unlock the doors.

• When opening a door or the trunk with the correct key without disarming the CTD system.

The components of the system are:

• The body control module

• The door ajar switches

Arming the CTD System
Important: The CTD system can be armed with the windows or sunroof open.

Use the following procedure in order to arm the system:

Place the shift lever in PARK (P).
Turn OFF the ignition.
Open any door.
Important: The system is not armed if the doors are locked manually, the remote keyless entry transmitter must be used to arm the CTD system.

Lock the doors with the LOCK button on the transmitter. The system is in arm pending mode and will not start the arming timer until all doors are closed. The security indicator will remain OFF, until the CTD system is armed. The CTD system will arm after the last door is closed.
The system will arm approximately 30 seconds from the time that the last door is closed. During this delay the THEFT SYSTEM indicator will be OFF. When the indicator transitions to FLASHING, the system is armed.
Locking The Vehicle Without Arming The CTD System
Locking the vehicle may be accomplished without arming the CTD system. Use of the manual door locks or using the key to lock the doors will lock the vehicle but will not arm the CTD system.

Disarming an Armed System/Silencing an Alarm
If system arming has been requested by the keyless entry transmitter, it must be disarmed.

Important: Using the power door unlock switch or manually unlocking the doors does not disable the CTD armed mode. Also, disconnecting the battery or pulling fuses does not disable the armed mode, since the BCM stores the CTD mode status in memory.

• To disarm the CTD system in arm pending mode, SECURITY indicator flashing and doors open, perform 1 of the following:

- Press the UNLOCK button on the keyless entry transmitter.

- Insert a valid key into the ignition and start the vehicle.

• To disarm the CTD system in the armed mode:

- Press the UNLOCK button on the keyless entry transmitter.

- Insert a valid key into the ignition and start the vehicle.

• To disarm the CTD system when activated, alarming mode.

- Press the UNLOCK button on the keyless entry transmitter.

- Insert a valid key into the ignition and start the vehicle.

Passive Arming Mode
Important: When the vehicle is in passive arming mode, the doors will not lock automatically. You must press the interior door lock switch, or use the key to lock the door.

When the CTD system is in passive arming mode, the system will arm itself one minute after the key is removed from the ignition, and the last door is closed. The doors will not lock automatically. You must press the interior door lock switch, or use the key to lock the door. If you lock the doors using the LOCK button on the keyless entry transmitter, the vehicle will lock, and the CTD system will arm immediately.

CTD Circuit Description
The following is a description of each component used in the CTD system:

Body Control Module (BCM)
The CTD system is an internal function of the Body Control Module (BCM) which utilizes class 2 serial data and various switch input information to perform CTD functions. When the BCM detects an unauthorized entry, it activates the horns and exterior lamps.

When the BCM detects an unauthorized entry, the BCM enters the alarm mode. The BCM activates the horns and exterior lamps for 2 minutes. This is followed by a 3 minute time-out with the horn no longer active. If no new intrusions are detected after the time-out, the horn is not active. The system must be disarmed or the intrusion condition removed after the time-out for the system to exit alarm mode.

Door Ajar Switches
The CTD system uses the door ajar switches in the door jambs as 1 method to activate the alarm. The body control module (BCM) monitors all door ajar switches via a discrete input from each door ajar switch, including the rear compartment. If the BCM receives a ground signal from a door ajar switch when the CTD system is armed, the BCM activates the alarm.

Inputs
The BCM monitors the following inputs:

• The driver and passenger door ajar switches

• The rear compartment ajar switch

• The transmitter LOCK/UNLOCK buttons, internal function of the BCM

• The Passlock™ Status -- The BCM uses the Passlock™ status for disarming the system or silencing and alarm when the correct key is used.

Outputs
The BCM controls the following:

• The horn relay

• The exterior lights
 
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