rheiy

My son purchased a 97 es300 awhile back and to make a long story short, the battery will need to be replaced soon. I know the lexus radio has a security code feature and we are not sure if it was ever set. Since the radio display is burned out, there’s no way to tell if a code is set or not.

Here’s my question, is there any way to change a battery while maintaining a charge to the car at all times so we don’t run the risk of having a dead radio. Even though the display is burned out, the radio works fine and we don’t want to go through the trouble of fixing the display just because of a security code.

Would appreciate any help on this
Thanks

RTIS250

iTrader: (9)

Many people have replaced the battery with the engine running. You have to be extremely careful not to ground the positive terminal/cable, but if done correctly, the engine will stay running with the battery removed, then reinstall new battery, and retain all radio, clock, etc... Not something i would recommend for someone who doesnt know much about working on cars though. If the terminal is grounded, the engine will shut off, and there is a chance of damage to the alternator or blown fuses.

BCP43002

Try this http://www.jcwhitney.com/computer-me...wx?filterid=j1

VVT-i

A good tome to upgrade to a new radio with XM and iPod ready. I doubt that the ex-owner set the security code on the radio.

Mike813

iTrader: (5)

i guess if you or know someone that have one of those portable jump starters you can have it connected to the ground & positive while you quickly change out the battery.

Spooled

iTrader: (1)

Just exchange it while the car is running. Have your son hold both the terminals while you lift the old battery out and while you re-install the new one.

I do this everyday at work for that exact reason (radio presets and clock)

bondye

It's not a good idea to leave the engine running witout battery attached.
The battery acts as capacitor and prevents from voltage peaks.
Without this there is chance to burn out your ECU with voltages peaks of 18-20V

fleecer

saw some contraption at pep boys that comes with a small battery and plugs into your cigarette lighter. supposed to keep all your settings. dunno if it works. its like 5 bucks.