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there is no override. Otherwise it would defeat the point of an immobilizer. I would find out why the alarm went off and deal with the rot cause rather than trying to bypass something made to be un-bypassable.
You may be able to reset the alarm by unplugging the battery from the car for a minute or 2 but I would start with the alarm manual to be safe. Possibly even remote the alarm and put the wiring back to stock.
Usually, it's one or two components that get hot - not the entire board. You should never touch a circuit board while powered to "feel for heat". Disconnect from power (unplug, shut off circuit, etc.) and wait a moment for capacitors to safely discharge. Check all components with a volt meter BEFORE touching them with your hands. You may also look for discoloration on the board near a component. If the component is raised off the board - it may not cause the board to discolor - as the further away from the board it is the less likely it will be to cause discoloration. High heat components have "heat sinks" that are larger pieces of heat conducting materials that are in physical contact with this components designed to wick heat and transfer it to the chassis, frame or air. These components will be warm or even hot to the touch - but it will be difficult to know if "too" hot as a result.
Transformers will get hot if you are running the receiver hard. Most transformers have a built-in thermal fuse. If this fuse goes, then you have to replace the transformer. Just make sure you have good ventilation around the unit. don't have anything on top that might block airflow
If the compressor is hot to touch and it is not cooling, contact a service professional as soon as you can. Sounds like you have a sealed system issue or cooling restriction and you don't want to ruin any food items in the unit.
The horn relay contacts are welded or the armature is stuck on. Replace the horn relay.
The horn switch on the steering wheel is stuck on (this is generally rare, but not a do-it-yourself repair because of the risk of exploding the air bag if you don't know how to safe it).
The horn switch wiring insulation has been cut and there is a short. This would probably be intermittent.
If you have a factory alarm, there may be a solid-state switch that takes its input from both the driver's horn switch and the alarm module. This switch could be shorted - it's probably a simple transistor, but may be mounted on the alarm module board. If so, disabling the alarm would not stop the horn unless the module is physically unplugged.