I had a loose post terminal on my battery, which caused the car to lose power, once i repaired the problem I no longer have power to my a.c. buttons. Air blows from the defroster but because the a.c button wont turn on, the air is not blowing from the vents. I've replaced the fuse and the ac relay. Can someone please help me, THANKS!

If your vehicle dies when the battery cables are removed despite having a good battery, it could be a problem with your alternator. The alternator is responsible for charging the battery while the engine is running. If the alternator is faulty or not functioning properly, the battery might not be getting charged, and the vehicle will rely solely on the battery's power. When you disconnect the battery cables, the vehicle loses its power source and can no longer operate. Alternatively, there could be a problem with the electrical system or wiring in the vehicle. Issues such as corroded battery terminals, loose connections, or a faulty ignition switch can also cause similar symptoms. It is essential to have the vehicle inspected by a qualified mechanic to diagnose and address the underlying issue. They can perform tests on the battery, alternator, and electrical system to determine the cause of the problem and recommend the necessary repairs.

Error Code P1633 means the PCM (powertrain control module, also known as ECM or engine control module in other vehicle makes) has detected a low voltage on the Keep Alive memory circuit. ... If the battery is disconnected, or the voltage drops below 10.5V, the error code will be set.

loose battery terminals
bad ground wire
faulty alternator or drive belt tension
bad ignition relay or fuse

Have you checked the battery?

Thanks for choosing FixYa and welcome. I would start by checking the alternator and battery out. Even though the lights are on, the battery can be too weak to crank the starter. Check your ignition fuse also. Sounds like a power issue so check all your battery wires and terminals/post out. May have a bad connection. Make sure it is not loose also. I would say check the alternator first cause it can kill the battery as well.

Thanks for choosing FixYa and welcome to the site. This type of vehicle has had major problems with the sliding doors. Whether it is not closing or opening right, just so you know. You could have two issues here, then, maybe not. It might be because of power loss. Since you know your battery is good, it has to be in the wires and the connection. Clean your battery terminals and post. Make sure your terminal ends are not damaged. Make sure they are not loose. If the ends are loose, take the terminals off and redo them. If so see damage to the copper wires, take it off and redo them. If all the copper wires are not inside the metal terminal end, you are not getting a full connection. You might want to go ahead and get two terminal ends. They are just a few dollars. If not, go ahead and redo them. I believe that is where your problem is. You can go ahead and check your fuse to the sliding door if you wish. If you have any questions, feel free to ask. Also inspect your battery lines to the alternator. If your alternator is going bad, it could cause the battery to loose power. Start your vehicle and take off the hot side battery post(red). If the engine dies instantly, you have a bad alternator. If it doesn't die instantly, it is the battery. Since the battery is good, it is your connection or the wires.

Review your recent repair records. Note if your mechanic replaced a battery, battery cable, alternator, starter or anything that would require disconnecting the battery. If so, it could be as simple as a loose connection or a defective part. Check the battery with the voltage meter first--it should read between 12.5 and 12.8 volts. If the battery is past its useful life (48 to 72 months), replace it.

Grab the terminals and twist them by hand. Make sure the battery terminals are not loose on the posts. A bad connection can cause low voltage to the starter and it will not crank the engine. Remove the loose terminal using a wrench, clean any corrosion from the terminal and post with a battery terminal cleaner and tighten the terminal securely to the battery post with a wrench.

Check the negative cable where it bolts to the engine and frame to make sure it is not loose. Check that the positive cable is not loose where it connects to the starter. If any of these cables are loose, this could be the cause of the problem. Tighten them with a wrench or socket wrench.

1. Starter
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     Connect the spring clamp on one of the starter button wires to the the battery terminal on the starter solenoid and the other one to the command terminal. Push the button--if the starter cranks the engine, the solenoid has failed. Replace the solenoid or, if it is part of the starter, replace the starter.
     

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     Check the manufacturer specs for how many amps the starter should be drawing. Connect your meter and watch the reading as you attempt to crank the engine. If the draw is too high or too low, replace the starter.
     

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     Raise the vehicle with a floor jack and support it with jack stands. If noise is coming from the starter, but the engine isn't cranking, check the starter gear and the flywheel for damaged or missing teeth. If this is the case, the starter or flywheel will need replacement.
     

Take off both battery cables and use coarse sandpaper to clean out the inside of the cable terminals and clean the outside of the battery posts. Examine the battery cables to make sure one of the the cables iis not coming loose from the end terminals. You may need to disconnect the other ends of the cable and clean those terminals also. If that doesn't fix it you should get the battery checked. It could have an intermittent internal short.
Using a pocketknife to clean the terminals before using the sandpaper could speed up the process if there is heavy corrosion.

It appears you have a poor battery cable ground connection. Remove the cable from the baterry ans lean the bat connection thoroughly. If this is a side post, put a ble in the terminal threads and see if the terminal is loose. If it is, The terminal is broken loose inside and the battery needs replacing. Good Luck, Ned

I would suggest start by replacing your battery terminal ends or at least removing them and cleaning them and the battery posts very good. A small piece of sandpaper will shine the battery posts up nicely. Clean off all the battery corrosion if there is any on the terminal ends and tighten them down on the battery posts tight so they don't move. If that doesn't solve the problem, check the onboard computer trouble codes.