2004 Chrysler Crossfire - Keyless Locking Buzzer

Radio Shack

Wireless Locking Buzzer Control Box with indicator light and switch

6/28/08

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Crossfire Maintenance and Modification

 

Sometimes an "audible" works better...

When I got the car I was relieved that it didn't "chirp" or blare the horn every time I locked or unlocked the doors.  Let's face it, there are times when we don't want our comings and goings announced in such a tactless manner.  Still, I found that in the daytime, when walking away from the car, or after forgetting until I'm some distance away, I could not tell if the car was locking or unlocking.

I found on the crossfireforum.org website an idea to install a device that gives out a gentle tone that can be heard from a short distance and does not announce the locking or unlocking like the opening of a Broadway musical.

So after reading the write-up I drew a schematic with some modifications of my own.

 Wireless Locking Buzzer Circuit Diagram

The design takes power and ground from the relay that flashes the parking lights when the car is locked (3 flashes) or unlocked (one flash)

The circuit I designed has a single-pole, double throw push-button switch.  In one position, the buzzer in the circuit quietly beeps.  In the other position, the lamp in the circuit flashes.  The reason for the lamp is to provide a diagnostic function to aid in troubleshooting if problems develop.  I mainly put the switch in to provide an easy way to disable the beeping sound if for some reason I didn't want it to operate.

I put together a control box that contains the buzzer, a lamp and a switch using the following parts. 

Project Enclosure - Radio Shack 270-1802 (4" x 2" x 1")

Project Enclosure  Radio Shack 270-1802
Lamp - Radio Shack 272-332 Lamp Radio Shack 272-332
Piezo Buzzer - Radio Shack 273-060 Piezo Buzzer Radio Shack 273-060
SPDT Mini Push On/Off Switch - Radio Shack 275-1555 SPDT Mini Push On/Off Switch Radio Shack 275-1555

 

I removed the relay and wrapped the wires around the 85 terminal (positive) and 86 terminal (negative).  After shaping the wires, I removed them and put some solder on them to help them keep their shape.  Then I replaced the wires on their respective terminals, and reinstalled the relay in its socket.

Relay with Wires wrapped around terminal 86 (negative) and 85 (positive)

Here is a view of the wiring coming from the relay in the upper right corner of the picture.  Black is ground and white is positive.  Note the thicker red wire coming off the fuse bank.  This is the switched positive lead that goes to the auxiliary fuse box I assembled and installed in support of my stereo install

Fuse Box with Stereo lead and Wireless Locking Buzzer leads

I took this opportunity to route the red stereo wire and the leads for the buzzer through a rubber port provided for this purpose.  The wires go into some plastic conduit that I installed to help keep the wires protected and dressed.

Route for wires into Fuse Panel Box

Here's another shot of the port with a white wire coming out of it.  The port slides out of the fuse case and can be easily handled to cut the holes and feed the wires through.  Then the rubber port can be reinstalled onto the fuse case.  Take care to get the rubber parts properly slotted on both sides of the case wall for proper sealing.

Auxiliary Wiring Port

The box containing the buzzer, switch and lamp is Velcro'd onto the fuse panel cover and allows me to activate or deactivate the tone alert by pressing the switch. 

Wireless Locking Buzzer Control Box with indicator light and switch

Wireless Locking Buzzer Control Box with indicator light and switch

Wireless Locking Buzzer Control Box with indicator light and switchWireless Locking Buzzer Control Box with indicator light and switch

Wireless Locking Buzzer Control Box with indicator light and switch

Crossfire Maintenance and Modification

 

Crossfire Maintenance and Modification

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