I have a 2005 Chevrolet Cobalt, I had to replace the Body Control Module as it got wet and shorted out. (Light flood) The radio is locked which is one problem, but the biggest issue is that I believe that the Theft Lock feature will not allow the car to start. Everything other that the radio works fine, the ignition seems to work fine, but when I turn the key to start the car, it does not crank and the security lock light comes on in the dash. The battery is fully charged, and I can jump across the starter and the engine will crank fine. It might have been a mistake, but I tried using a remote start button on the starter while the key was on, the engine would start run about 10 seconds and die.
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The BCM will then unlock the doors when the ignition is placed in the OFF position. Do the exterior lights flash as well as the horn sounding ?
Body Control Module (BCM)
Content Theft Deterrent
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 This is followed by a 3 minute time-out with the horn no longer active.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.
The fog lamps are computer controlled .the body control module (BCM) will energize the fog lamp relay control circuit. The BCM receives the park lamp ON signal from the interior park lamps supply voltage signal circuit.
DTC B2527 Front Fog Lamps Circuit Low
The body control module (BCM) monitors the front fog lamp switch signal circuit in order to determine when the fog lamp relay is to be energized. When the BCM senses that the front fog lamp switch signal circuit is grounded momentarily by pressing the fog lamp switch, the BCM energizes the fog lamp relay by grounding the fog lamp relay control circuit.
Your best bet , take it to the dealer . Could need BCM replaced , would need to do testing using the Tech 2 scan tool . A new BCM has to be programmed .
Body Control Module (BCM) Replacement
If the body control module (BCM) is replaced, the following procedures must be performed in the following order:
BCM Reprogramming--Refer to Body Control Module (BCM) Programming/RPO Configuration in Computer/Integrating Systems.
Important: This procedure has to be performed only for vehicles equipped with the Passlock™ System.
Theft Learn--Refer to Programming Theft Deterrent System Components in Theft Deterrent. A new BCM will learn the Passlock™ information automatically, but the powertrain control module (PCM) must still learn the theft information from the BCM.
problem in theft security system it has to be reprogrammed to new key new ignition switch key lock system. dealership fix need diagnostic eqquipment to reprogram new ignition key and ignition switch lock cylinder to the immobilizer control module and ECM.
If your radio has anti-theft system you will have to go to the dealer and get the accss code to reactivate the radio if you dont have the code already. GM vehicles with anti-theft radios will lock when power is lost to the system if the radio is not turned off prior to battery disconnect or dying.
Sounds like you may need a Body Control Module. It's not a radio code or the radio would say "CODE" And because the dome lights dont work and the trunk unlock quit working, a Body Control Module sounds reasonable. You have to get them new because they are VIN specific and might possibly have to do a Theft re-learn after installation. Junkyard parts will not do or you will have more problems than you have now.
Sounds like a bad ignition switch have ur body
control module checked for codes if u have a B2960 and or B3033 then
replace the ignition switch.
If your vehicle has the remote keyless entry system, this feature allows
you to select the method used to arm the vehicle's security system.
When SECURITY appears on the display, press the reset button to scroll
through the available settings: * RKE (Remote Keyless Entry) (default): The content theft-deterrent
system will arm when the lock button on the remote keyless entry
transmitter is pressed or when the power door lock switch is pressed.
* PASSIVE: The content theft-deterrent system will arm itself 60
seconds after the ignition has been turned off and all of the doors have