Dead battery - Defender Land Rover Cars & Trucks

Question edited for clarity and spelling of maker 'Lexis' to Lexus.
Question moved to model category.

Get underneath the engine and attach a battery charger positive to the positive lead on the starter and a clean bolt on the engine or bodywork. In 15 minutes, you will be able to open the door.

Alternatively there is the easy way, use the emergency door key that is hidden in the fob.

Manually Unlock Lexus - Dead Battery

youcanic https://www.youcanic.com > Vehicles > Lexus
Nov 6, 2023 - To unlock a Lexus with a dead battery, you can use the emergency metal key inside the keyfob to unlock the driver's doors. The instructions in ...

How to open the car or hood when battery is dead

ClubLexus https://www.clublexus.com > rx-4th-gen-2016-2022
Jun 6, 2019 - Driver door has a lock cylinder. Pull the physical key out from the fob and pull the driver door handle and look in the gap between the door ...

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you lost DC power, the main battery is dead.
no list of good and bad,just bad.
DC power goes to VAST things, in all modern cars even 10x more.
so all things good and bad matter.
engine dead. will not crank or start or run
head lamps dead, or dim, key on and off.
blower dash (heat?) dead. on all speeds for sure high.
dome lamp dead
windows dead, door locks dead.

what to do, when DC fails for sure the engines stater motor dead.
making car useless.

• check fuses first.
• check battery voltage 12.6vdc rested never 10v or below.
• jumper cable crank start the dead engine,
• runs now, if yes check battery again, 13v to 15vdc below is bad dead alternator (or its fuse, ore belt fell off/slips)
• a bad battery ca n cause modern cars ALternator to go off line to prevent battery rupture (flying acid doomed)
• scan the car key on,see DTC errors like (fuse blown or battery dead errors)
• that is it for this far, a voltmeter finds it. easy used.
• one more, if IMMO lamp is not happy ,engine can not run.

Why is My Car Battery Dead? - AtBatt.com

www.atbatt.com > Car Auto > How to Guide

There are many reasons why your car battery could be dead. In this short article we explore several things to consider when asking the question "Why is my car ...

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How to Charge a Dead Car Battery (with Pictures) - wikiHow

www.wikihow.com > ... > Car Batteries and Ignitions

wikiHowHow to Charge a Dead Car Battery. There are several reasons your car battery coulddie; including going for long periods of time without starting your car, ...

Car Battery Goes Dead after A Few Days - Instructables

www.instructables.com/.../Car-Battery-Goes-Dead-after-A-F...
InstructablesCurrent draw while the vehicle is parked and not at all in use is the problem. ... I have left my car unused for a few days and the battery still started the car. I read on a .... Is there room under the hood to run a dual-battery set-up? IMadeIt

Battery goes dead - GM Inside News Forum

i guess you mean starter is dead, and all lights dead.
pointing to....
the battery is dead, did you jumper cable start it?
if that works the battery is bad, dead or only dischanged.
if that dont work make sure the battery cable lugs are cleaned.
no rust on cable ends( that green junk there that all cars get)
if the head lamps die (they work key off so...)
then the battery is dead, or rusty lugs.
if battery is dead, charge it. using a charger.

that is because it is dead?
that key dead thing is called NO CRANK, not no start.
no car starts unless cranked, or push started or gravity started,
so its a NO Crank issue,
and the stalls, well if the battery drops below 10v the EFI system
stop working just like your lap top does, or CEL phone
and for same reasons.

most folks do a jumper cable crank next. like the AAA tow truck man does first, and for good reasons.
this proves what is wrong,
1: battery was dead (car cranks now)
2: starter dead. or key line dead, if not. cranking now.

my guess is its #1

if battery was dead, then it is

• bad battery.
• only discharged, so why not charge it?
• or phantom drains, (over night parking battery dies)
• or alternator is dead, (chargelight glowing? test alt.

place the positive lead from the jump battery to the positive terminal of the dead battery. take the negative lead from the jump battery and place it on the engine or other metal point--- NOT TO THE NEGATIVE TERMINAL OF THE BATTERY-- If you do then you run a real risk of a power surge that will fry the ECM
However with a dead battery if the cells are failed then the power from the jump battery will probably feed the dead short in the dead battery and it may not work
Best have a load test done on the dead battery to see if it is faulty (cold weather) or just flat

its should still open even with the battery dead all doors should open manually with the battery dead

SOUND LIKE A DEAD BATTERY, OR LOOSE CORRODED BATTERY CABLES.CHECK BATTERY VOLTAGE SHOULD BE 12.6 VOLTS.IF BATTERY WAS DEAD, MAKE ALTERNATOR WORKING,WITH ENGINE RUNNING ALTERNATOR OUT PUT VOLTAGE AT BATTERY SHOULD BE 13.5 - 14.5 VOLTS.THERE IS A REASON BATTERY WAS DEAD EITHER BATTERY WORN OUT OR ALTERNATOR STOP CHARGING BATTERY.

Battery can be so dead that it won't take a jump. If it is the original 5 year old battery, you would be well advised to scrap the battery. If it is newer than 5 years old, charge battery on a battery charger for enough time to properly charge it. Then test it. Still dead? Scrap battery.

That's all I can offer you as you don't say why you think you have a dead battery.