Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Good afternoon and welcome to JustAnswer!!
If the alarm is sounding, what happens when you press the unlock on the remote? Will it start up and run?
have you tried hitting the panic button on the remote? If that or hitting the unlock will not disarm it then reply back with the last 8 digits of your VIN so I can see what your Challenger is equipped with..
To Disarm The System
The Vehicle Security Alarm can be disarmed using any of the following methods:
Press the UNLOCK button on the Remote Keyless Entry (RKE) transmitter.
Grasp the Passive Entry Unlock Door Handle (if equipped, refer to "Keyless Enter-N-Go™" in "Things To Know Before Starting Your Vehicle" for further information).
For vehicles equipped with Keyless Enter-N-Go™, press the Keyless Enter-N-Go™ Start/Stop button (requires at least one valid Key Fob in the vehicle).
For vehicles not equipped with Keyless Enter-N-Go™, insert a valid key into the ignition switch and turn the key to the ON position.
The driver’s door key cylinder and the trunk button on the RKE transmitter cannot arm or disarm the Vehicle Security Alarm.
Have you tried disconnecting the battery again for 5 min to discharge all the modules, then reconnect and see what happens? DO you see a red security light on in the dash?
The Vehicle Security Alarm remains armed during trunk entry. Pressing the trunk button will not disarm the Vehicle Security Alarm. If someone enters the vehicle through the trunk and opens any door the alarm will sound.
When the Vehicle Security Alarm is armed, the interior power door lock switches will not unlock the doors.
The Vehicle Security Alarm is designed to protect your vehicle; however, you can create conditions where the system will give you a false alarm. If one of the previously described arming sequences has occurred, the Vehicle Security Alarm will arm regardless of whether you are in the vehicle or not. If you remain in the vehicle and open a door, the alarm will sound. If this occurs, disarm the Vehicle Security Alarm.
If the Vehicle Security Alarm is armed and the battery becomes disconnected, the Vehicle Security Alarm will remain armed when the battery is reconnected; the exterior lights will flash, the horn will sound. If this occurs, disarm the Vehicle Security Alarm.
Since this started after you replaced the radio, have you tried disconnecting the radio to see if it still arms? The remote should disarm the system when you unlock the doors as well as starting the vehicle with a valid remote should disarm it...
Do you see a security light on in the dash? Do you have another key to try?