Question edited for clarity and toss in some CAPS.
Question moved to model category.
When you replaced the fuel pump, you disconnected the battery, yes (because they tell you to)?
You now need to reset the security system and engine immobilizer.
have you checked the fuse at the back of the radio ? If ok and has power to the radio then check the earth is ok, and the ignition on power is ok , if all these are ok then the fault lies within the radio
The fan is located behind the glove box, above the passengers feet. The 2 most common failures are the blower motor and the blower resistor. This system is a switch to ground setup. Unplug the blower plug and see which wire is hot, it should always be with the key on. With the car running and the fan switch on, hit the blower with the palm of your hand. If it comes on, it is bad. the brushes wear out. Also you can unplug the resistor, and ground the output wire at the blower, or resister. to see if it works.
Here are the instructions to test the braking switch and related components to locate the fault.
Brake Pedal Position Switch Test
1.) Disconnect the 4P connector from the switch (A).
2.) Remove the brake pedal position switch.
3.) Check for continuity between the terminals according to the table, using a multimeter.
4.) If the continuity is not as specified, replace the brake pedal position switch and adjust the pedal height.
5.) If OK, install the brake pedal position switch and adjust the pedal height.
Question edited for clarity and make sentences.Remove the unit, remove the connectors, spray them with electrical contact cleaner and then replace them making sure they are well locked into place.Or there is a dry joint inside the unit.Start with the easy stuff first.https://www.google.com/search?q=Acura+RLX+radio+turns+off+every+time+I+hit+a+bump..
Check for spark to the plugs and fuel to the injectors. A scanner would help to find a problem. First start by spraying a little starting fluid into the throttle body. If it starts, then check fuel pressure. You may have a bad pump or relay. If no spark, problem could be a bad sensor or bad connection to a module.