Error codes 161 and 163 and problem entering BIOS to settings
Understand that these error codes are for the CMOS battery and time and date setting in the BIOS, respectively Also realize had done was to remove the CMOS battery which was working fine, and then reconnected it. Does the system prevent entry into the BIOS if the CMOS battery is seen faulty? Without clearing this error  it will be impossible to get into the settings? Additionally the problem still exists after replacing the CMOS battery. Have seen many post this problem in several forums on the net in my searches over the last few years. The one finally saw yesterday, that stated about an adjustment to the sequence to the steps in the manual, a averted a costly system board replacement, is the first one have found that says anything otherwise. Am looking to see if YOU know what these steps are, or what document they may be in. Did not find them in the Hardware Maintenence Manual C79KDMST, and as stated the one that responded to the requester, wrote that had answered in private, seemingy to protest against thieves. [maybe she was just refering to clearing the POP which is clearly outlined in this manual anyway] So can you help me more with the correct sequence of steps to entering to the BIOS settings, especially that there is this 'blank' POP requiring a Return at the Lock icon prompt, and with these errors, or at least after the Error 161 is cleared. Thank You
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[CHANGE YOUR CMOS BATTER WHICH IS INSIDE YOUR CPU CASE] I do not think you fixed the CMOS battery - (backup battery = CMOS battery) According to the error codes, you have a dead backup battery and the time is not set. Makes sense? 161 (Dead battery.) 1. Go to Checking the Backup Battery 2. Backup battery. 3. System board. 163 (Time and date were not set.) 1. Set time and date. 2. System board.
Go to www.ibm.com Find and download the user manual, and the "hardware maintenance manual." Do you know how to get into bios/setup?
Start with the machine OFF. HOLD DOWN and CONTINUE TO HOLD THE "F1" key. WHILE STILL HOLDING "F1", turn the power on, and CONTINUE TO HOLD "F1" This will get you into the bios "setup." You should check the date, bootup order, etc, and reset. I would check the "wire" you think you reconnected---you may just not have actually reconnected it. The "hardware maintenance manual" shows you how to maintain this machine, and it explains the meaning of the error codes.
This will get you started on looking for the manual:
The 161 CMOS error means the CMOS/BIOS battery is dead/flat and needs to be replaced.
The 163 CMOS error means the Date and Time could not be updated when you change the Date and Time setting. This is caused by the flat CMOS/BIOS battery.
When you replace the battery with a new one, the BIOS will go back to the default settings, go into to BIOS setting (press F2 when you boot up) and change the Date and Time, then save and exit.
Error code 0271 - Date and time error. Neither the date nor the time is set in the computer.
Run BIOS Setup Utility to reset the time and date
It sounds as though your computer has the wrong time in the CMOS. The CMOS (Complementary Metal-Oxide Semiconductors) is the chip that holds the basic startup information for the BIOS, system and its peripherals while the system is turned on and off.
If you can get into the BIOS check the date and time settings and make sure they are correct.
It may also be a case of the CMOS battery going out. When this happens your computer will tend to not keep the correct time. They are cheap and relatively easy to replace. Before buying a new batter your can try to take it out and let it sit for about 10 minutes or so to reset the CMOS and then go put the battery back in and go into the BIOS and reset the clock.
Hopefully taking the batter out or replacing it will get past your lock icon asking for the password. Just search for CMOS or BIOS default password for your brand of laptop.
You need to replace your BIOS battery. The battery is old and cannot maintain the BIOS configuration. That is why you are getting incorrect date and time and bad CRC error.
Replace the battery and then configure the BIOS settings.
1) This is a typical problem when the CMOS battery is very weak or dead, it will continually display the date and time and reboot with the same errors until you change the CMOS battery. On this model it is behind the door that houses the memory chip, above the battery, if you have the laptop turned over and battery closest to you. <--best bet, its a dead CMOS battery.
2) You can get to the BIOS to run tests, one of 2 ways, either hit the ESC key and other keys to get a 301 error or hold the F1 key and boot, you should get into BIOS. (You probably won't be able to do this until you replace the CMOS battery.) From there you can run diagnostic tests on various components.
3) Lastly, you can update the BIOS. From inside the EASY-SETUP bios you should be able to copy the BIOS part number, date, etc. Look for the BIOS update based upon model # either thru a search on the web or directly on the IBM website (a search on google of "bios update thinkpad 380ed" will bring up a link for the IBM page.) If you choose to do a BIOS update, read the directions carefully and remember not to power off the machine while the update is happening. If you've never updated a BIOS before, get someone who has to walk you thru it before attempting it by yourself.