2004 malibu classic door locks

You would need 2 relays. There is just one wire for the doorlock controls in your vehicle so you would only be making one connection to the car's wiring. You can find a wiring chart for your car here. You can find the wiring diagram for your door locking system on page 38 of the 553t installation manual under type H negative multiplex. Good Luck Keep us posted.

Try without a relay first. Most systems are low current (-) output systems but can still perform the operations of lock & unlock without the use of relays. Place a 1500 ohm resistor inline for the UNLOCK wire and use a straight connection for the LOCK wire to the WHITE wire from the Hornet system. When you have everything else connected and ready, try and see if the locks work. If they do your set and wrap things up. If not, then add a relay to the system. The Compustar systems that we install usually can trigger the door locking system without the use of relays & this works on about 80 % of the vehicles.Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

Thanks for the help.

Hey Velocity... This brings up a question for me. Since this is a multiplexing door lock system, what happens when +12V is applied to the factory doorlock wire? The DEI system this person is installing provides both a + and - output on the same wire. When locking one wire provides a - pulse and the other provides a + pulse. When unlocking this reverses and the same wire that provided a - pulse for lock now provides a + pulse for unlock. Wouldn't the + output on the multiplex wire at the same time as the - output cause a problem? I was going to recommend trying diodes with the resistor, but they would induce their own amount of resistance, so I just recommended using relays. I am curious to hear from you for my own knowledge. Thanks.

Twelvoltz, Thanks for the response and I wasn't aware that the 553T was an alternating polarity system. As stated in my post that most systems are a (-) trigger system.  Nothing will happen to the multiplex wire as its rest state is nothing, but if you don't diode/relay isolate the 553T alternating polarity wires, this will cause problems for the RS/security unit. The multiplex wire rests at nothing and when given 12 volts it will not damage anything. Thanks for the heads up on the alternating polarity system on the 553T. If this were a (-) trigger system then it should be no problem attaching both lock & unlock to the same wire. All of the systems that I install have a (-) trigger so I do not have the need to relay or diode isolate the Type F door lock systems.Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

Thats what I was thinking. Thank You for your input!

I have done those car withou relays just make sure u use diodes and resistors, Then again if u must use resistors and relays.Luis

Sound Waves

Is up to the installer to test all wires with a DMM whenever possible.

The new Malibu doesn't have the relays in the driver's fuse box anymore Luis. The (+) trigger at that location is no longer available unless you know of another spot that isn't common knowledge ?Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

No Jeff , I just use negative trigger to the single wire in the car and put diode to prevent the positive trigger from going to the same wire while the car is being locked, Aperrentlly the signal is strong enough. I have learn this trick from , Chris Loungo he posted on line, he post here quite often as well as in other forums ( carsound, dei, etc) If the unit u are using for door locks has only negative trigger for the lock wires, I don't use the diodes , but if it has alternating polarity ( + and - ) I will use diodes. I must admit using relays by far is the best way, it isolates the wires as well as giving a stronger ground pulse, but it is a timer saver as well, I have done many Impalas as well as Grand Ams and have not seen them come back. Luis

Sound Waves

Is up to the installer to test all wires with a DMM whenever possible.