Is the vehicle security light lit ? It could be a fuse or the starter relay , or even the ignition switch , or even the PNP - park neutral position switch . This is a complex electronic starting system , computer controlled . The ignition switch is a low voltage input to the the BCM - body control module . When the BCM receives this input to crank the engine a lot of complex commands are sent over the serial data network to the PCM to enegrize the starter relay , there by sending battery voltage to the S terminal on the starter solenoid . If your mechanic disconnected the battery it could have caused the radio to say locked , you need a code to enter into the radio to unlock it , may need to have the dealer hook up their factory scan tool to do that .
Your best bet , find a better automotive technician , not a mechanic.
Circuit Description (Key Start)
For ignition switch power modes refer to Body Control System Description and Operation in Computer/Integrating Systems. Once the ignition is placed in the Run/Crank position, the control circuit of the Run/Crank relay is grounded by the body control module (BCM). With the Run/Crank relay switch closed, battery positive voltage flows through it and on to the park/neutral position (PNP) switch. With the PNP switch in either the Park or Neutral position, battery positive voltage will flow to the starter relay coil supply voltage input terminal of the powertrain control module and the coil side of the starter relay. Placing the ignition in the START position sends a message to the powertrain control module (PCM) requesting engine start. If the PCM has determined that the transmission is in Park or Neutral and theft is not active, it will ground the control circuit of the starter relay. Battery positive voltage will then flow through the switch side of the starter relay to the S terminal of the starter solenoid, cranking the engine.
SOURCE: chevy 2002 malibu radio wont turn off
First of all, make sure your iginition switch is completely in the off position or your radio will stay on. I had problems with this and all I had to do was make sure my shifter was locked in the park position (try jiggling it around in park until it clicks). If that doesn't help, the fuse for the radio is located on the passenger side of the vehicle on the side of the dashboard- you have to open your door to access it.
SOURCE: Replace Dash light bulbs on 2004 Malibu Maxx
you need to take the hole dash out and on the back of the speed dash there are little bulbs take them out then replace them
SOURCE: where is fuse in fuse box on chevy malibu 2004
There are 2 fuse panels in car, 1 under hood and the second under drivers side of dash, above hood release area. Radio fuse should be under dash, most likely a blue(15amp) fuse. The fuse panel glossery should be on inside cover of fuse panel or in owners manual under fuses in glossery.
SOURCE: 2006 CHEVROLET MALIBU MAXX , RADIO LOCKED MESSAGE
Turn off car. Remove the fuse that goes along with the radio, it's under the dash on passenger side. Replace it and turn car back on.
SOURCE: Stuck CD in the multi CD player of 2004 Chevy Malibu Maxx
The only thing that is left for you to do is to remove the stereo and then disassemble it and remove it yourself. A little daunting but needs to be done. Sounds like it went in wrong and then became jammed
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