BCM CONTROLS WHAT IN CHEVY MALIBU 2001 DOES IT CONTROL ANTITHEFT SYSTEM GAUAGECLUSTER HAVING ISSUES WITH BOTH THANKS

You have a gremlin ! No , just kidding . No it's not the ignition switch ! The headlamps right an left have there own fuse in the under hood fuse box . LH HDLP - RH HDLP . Power direct to the head lamps an they ground through the headlamp switch when placed in high or low beams . Next time they come on wiggle the headlamp switch an see if they go out ! Does your vehicle have auto lights ? Day time running lamps ? The BCM - body control module controls Automatic lamp control !
Battery voltage is applied to the headlamp bulbs at all times. The headlamps are controlled by supplying the ground for the lamps through the turn/headlamp switch assembly or the body control module (BCM). When the turn/headlamp switch is in the ON position, the ground is supplied through CKT 150.
The BCM controls the daytime running lamps (DRL). The system allows the headlamps to operate at a reduced intensity under the following conditions:
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The engine is running.

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The transaxle is not in the PARK position.

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The normal headlamps are turned OFF.

The BCM activates the system by grounding CKT 592. This action energizes the DRL relay. This condition allows a reduced voltage to flow to the headlamps. When the headlamp switch is turned to ON, the headlamps operate normally.
The parking brake provides an input to the BCM. When the parking brake is engaged, the DRL remain disabled until the parking brake is disengaged.

There is no fuse for the anti-theft system ! It receives it's voltage from the BCM . Do you know what a BCM is ? It is a Body control module .
The Passlock?"¢ System is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. If starting is attempted without authorization from the Passlock?"¢ System, the powertrain control module (PCM) will disable engine starting. Start disable may be in the form of fuel disable or starter disable, depending on engine application.
The components of the Passlock?"¢ System are as follows:
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The ignition lock cylinder and key

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The ignition lock cylinder case, including the Passlock?"¢ sensor

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The ignition switch

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The body control module (BCM)

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The security indicator on the instrument cluster

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The powertrain control module (PCM)

The body control module (BCM) contains the logic of the Theft Deterrent System. The BCM provides the battery positive voltage to operate the Passlock?"¢ sensor. The BCM also measures the voltage of the security sensor signal circuit. The voltage measured will indicate whether the Passlock?"¢ sensor has been activated and whether the resistance value from the sensor is a valid value or the tamper value. If voltage measured is in the valid range, the BCM compares this voltage, voltage code, to a previously learned voltage code. If the voltage codes match, the BCM sends a class 2 message containing a password to the powertrain control module (PCM). If the voltage codes do not match, or the voltage is in the tamper range, or there is a circuit fault, the BCM will not send the correct password to the PCM, and the vehicle will not start.
The body control system consists of a BCM and it's associated controls. Battery positive voltage is provided to the BCM from CLSTR fuse in the Fuse Block-left I/P. The module ground is wired to ground G201. The BCM is wired to the Class 2 serial data communication bus as well as discreet input and output terminals to control the functions of the vehicles body !
Now then Karen what problem is your vehicle having , no start an SECURITY light flashing or on solid ?
Now then

is the antitheft light on in the dash?

The factory radio in the car is an integral part of the BCM (body control module) system. Changing it will result in the inability of the BCM to function properly.

I just had that same problem!!! The BCM(Body Control Module) was bad in my car.... same as yours 2001 Monte Carlo. It cost 280 for the BCM and 95 to program it. The dealer wanted 695 for the BCM and programming. My. Heated seat buttons begin to work and my reverse lights work now also.
F.Y.I turn your antitheft lock off from your radio before you take it into the shop. I'm having a helluva time trying to unlock mine since the BCM was put in. And for some reason my airbag light is on now also. Just a heads up.

INGNITION KEY IS CHIPED CAR IS IN ANTITHEFT MODE/FAULT WITH KEY

first, remove the lower right dash insulator panel from below glove box. slide bcm aside for access to blower motor.(slide to right). remove 3 screws from blower housing, pull blower motor and fan straight down. if putting in a new motor, use cage from old blower. the resistor for fan speeds is located beside motor. good-luck!!

No the Chevy Malibu is not made by Kia!
I think you mean horn relay
I would try a new relay it is possible that the relay is defective and that's why it was removed
here is how the horn circuit works
The body control module (BCM) controls the horn relay by grounding the control circuit of the horn relay coil. When the horn relay coil is grounded, the horn relay contacts close, applying voltage to the horn via the horn supply voltage circuit.
if the horn relay does not fix your concern you may need to take it to a shop and check for any BCM fault codes
and you are correct having no horn is a SAFETY ISSUE
that car should have NEVER PASSED A SAFETY WITHOUT A HORN
hope this helps good luck and I hope the relay fixs it because a BCM is costly

That model was known for lock cylinder ans ignition switch problems for the no start and theft lock concern.The chime issue could be a problem or not check in your owners manual for chime sounds.I remember when working on these cars they have different chime sounds for different selected options that could be changed and I also had some problems with the BCM body control module causing some weird issues with these models.

Remote control door lock reciver an the BCM - body control module control the locks . The key switch is a electrical input to the BCM , the BCM controls the door lock actuators . Your best bet ,have it towed to the dealer .