Originally Posted by
zip439
The anti-theft system is integrated with the air pump in the rear of the Crossfire. If the anti-theft system is without power (fuse 9) the air pump doesn't work to lock/unlock the doors. The interior lights are also powered by fuse 9; thus if the lights aren't working the pump isn't getting power and the doors will not lock/unlock with the FOB even when the FOB is working correctly. Looking at the interior lights is easy quick way to see if there is power at the air pump. You have several times inspected your FOB and it seems to be okay from what you have told us, so I was looking for another explanation why the car doors were not locking and unlocking. I agree that the likely problem is in the FOB, but it being so easy to check the power to the air pump and anti-theft system it should be checked.
As for the siren, it to is part of the anti-theft system. The batteries leak and over time it will get on the electrical board in the siren which can interfere with the proper operation of the anti-theft system and possible prevent the car from starting. Leaving the siren connected is not a wise thing to do. It is best to open the cowl and replace the siren with a new one or disconnect the electrical connector at the siren so that it is no longer connected to the system. It is also a good time to clear any debris from the four drain lines that are under the cowl as clogged drains will give you addition problems down the road if they do not drain water out of that area.
Removed siren this morning and cleaned out the coil on my NA. I usually do it once a year but never bothered to remove the siren as it hasn't worked in years. Now it's disconnected.
My SRT6 came with the siren disconnected when I recently installed a new one in that car with the lock/unlock chirp function..
End results...interior lights work, car lock/unlocks with the interior button and also with the key in the door.
I'm definitely suspecting the board in the FOB having been damaged somehow. Visually inspecting it, I didn't see anything wrong with it besides slightly bent contact points at the battery and I compared it to the other working FOBs from the SRT6 and vent them exactly the same.
I am tempted to take apart the key fob again and hook up a multimeter to see which contact points/solder joints receive amperage.
Watched a couple of YouTube videos...including one from a guy who fixed a Crossfire FOB...and it kind of explains how to test trigger points on the FOB. Might try that in a quiet moment as a last resort. If that doesn't work it's going to be ordering a new FOB from Needswings etc. Been wanting to do that for a while anyways.
Thanks for your input and everyone's help!