Question about 1993 Lexus Es 300

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Battery cables switched

Autozone sold my son the wrong battery. He put it in the only way it would fit and attached the cables. He got a spark but it would not start. We took it back to the store and they replaced the battery with the correct one. Installed it and still nothing. A mechanic has been trying to figure out what is wrong. Now after 4 days and extensive tests he says the computer needs to be replaced. Is this an easy fix or should we have the mechanic do it? Should we only use new parts or is it okay to replace with a used computer? Or should we just scrap the car and put our money towards something else?

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  • Meg Gloyd
    Meg Gloyd Feb 10, 2014

    By the way, they have replaced the main fuse but there still is no fire.


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  • 56 Answers

2nd hand ecu is fine just a few tricks on getting it started

Posted on Feb 10, 2014

  • Bob MacDonald
    Bob MacDonald Feb 11, 2014

    This is true, but be careful to understand the return policy of where you buy a used one.


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Make sure an OBD reader is used to make a connection to the car's ECU/ECM. If no connection can be made, then you can remove the ECU and test it for current and resistance. If either of those tests fail, your car needs a new computer.

Posted on Feb 10, 2014

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Posted on Jan 02, 2017

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SOURCE: Battery not charging - Lexus ES300

your problem is the main fuse is blown under hood. it will be like a 100 or 120 amp fuse bolted in from sides of fuse/relay box.

Posted on May 20, 2009

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SOURCE: Will Not start even if you jump it nothing.

it is absolutely the starter solenoid im not sure if you can replace just the solenoid but you definitely need a new starter / solenoid.

Posted on Jun 24, 2009

  • 2382 Answers

SOURCE: son (college student/part time

Hi, causes of excessive current drain from a car battery include things like lights that remain on (trunk and hood lights, interior lights, brake lights, etc.) and also relays that may be stuck on, or modules that are not going to sleep or powering down. A fuel pump relay that sticks on may keep the fuel pump running after the engine is shut off. A switch or relay that powers a rear window defogger can stick on, pulling current from the battery after the ignition is off. An electronic suspension module, ABS module or keyless entry module may remain active long after it should have powered down.An accessory such as a DVD player, game console or cell phone charger left plugged into a rear seat power receptacle may be pulling power from the battery. So before you spend a lot of time trying to figure out where the amps are disappearing, check all of the vehicle's power receptacles to see if something is plugged in that may be using power.


If the key-off current reading is above specifications (typically, more than 50 mA one hour after the vehicle has been shut off), the current drain is too high. It's time to start pulling fuses and relays to find the fault. Refer to your vehicle owner's manual or a wiring diagram to identify the fuses and relays. Then pull the fuses and relays one at a time until the current reading drops. Avoid pulling the fuses for the PCM or other KAM-sensitive modules until you have checked all of the other circuits.
Once you've found the circuit that is causing the excessive current drain, check the relay, switch, module or other components in the circuit and replace as needed.
Sometimes a bad alternator diode can cause a car battery to run down. A good diode should only pass current in one direction. If it leaks current in the opposite direction, it may keep the charging circuit on when the engine is not running, causing the battery to run down.

Posted on Oct 06, 2010

  • 294 Answers

SOURCE: my car just stopped ....lost power. Battery is

Have your alternator tested very soon. You charge it up, it runs good, then over time, it loses power. To me, that sounds like all your electrical loads are being carried by the battery alone, with no help from the alternator.

Posted on Dec 01, 2010

  • 351 Answers

SOURCE: bought new battery at autozone changed battery and

you might of blown your main big fuse and maybe a couple of fuseable leaks it will blow fuses and relay be fore irt would hurt your engine

Posted on Jan 26, 2011

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Replaced starter in xc90 volvo now can not put terminal on battery sparks

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How to jump start a vehicle safely

You have a dead battery and need a jump start. There is the right way and the wrong way to accomplish a jump start safely. Because of the potentially severe hazards due to improper use of jumper cables it must be done correctly. Auto batteries contain Sulphuric Acid which can blind you, or at the very least burn your skin. Also auto batteries vent off Hydrogen Gas which is highly explosive even from the slightest spark. Because of this danger it is critical to attach the jumper cables in a precise sequence. 1. Park the vehicle with the GOOD battery close to the vehicle with the BAD battery but do not let the vehicle touch each other. Make sure the cables are not routed so as to touch any moving parts, such as a fan blade. 2. Attach the jumper cable Positive + terminal to the GOOD battery Positive + terminal. 3. Attach the other end of the jumper cable Positive + terminal to the BAD battery Positive + terminal. 4. Attach the Negative - jumper cable terminal to the GOOD battery Negative - terminal. 5. Attach the last jumper cable Negative - terminal to a heavy metal ground part of the engine and NOT to the dead battery Negative - terminal. Reason being this last connection will cause a spark, and you do not want a spark next to the battery where it could ignite the Hydrogen. 6. If the engine of the donor vehicle with the good battery was not left running, start the engine and let it run for 2-3 minutes to put a charge in the bad battery. 7. Start the vehicle with the BAD battery and then remove the jumper cables from the batteries in the exact opposite order you installed them.

on Jun 19, 2010 | Honda Accord Cars & Trucks

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Son Installed new battery and now no current to anything

Measure the voltage in the new battery. It should read close to 12Volts. Some batteries need to be charged before they are sold. Perhaps yours didn't. Have you tried to charge it yourself?

Dec 03, 2013 | 2005 Acura MDX

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Hi i have just had a new alternator, ignition leads and fuel filter fitted to try and cure bad misfire and flat battery, my spark plugs are wrong for my car could this be the problem as it is worse than...

yes, the spark plugs could be the problem but not always and the reason for this because if you bought these spark plugs from Autozone or Advance Auto Parts stores that they would on there computer systems show the right specs of right spark plugs for the certain car of yours. You should first put into your gasoline injector cleaner to see if this would clean your fuel injectors so the right amounts of gas is injected into the piston chambers is why its misfiring properly with some of the fuel injectors. If your car battery is going dead that you can your car to Autozone so they can check the alternator and battery out for free for you so when you go there to make sure they do this.

Jun 08, 2011 | Ford Fairmont Cars & Trucks

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How do I give a jump start to another veichle?

Your jumper cables are most likely red and black. Locate the positive and negative terminals on your battery, they are marked ( + ) or pos.,that's the red one, and ( - ) or neg. that's the black one. Conect one end of your cables to your battery (doesn't matter which one you do first) make sure you are connecting the other end to the same terminal on the dead battery (that is to say positive to possitive) now do the same with the other cable. There may be a little bit of a spark that's normal when you make the final connection. The danger is in taking them off, do it in the same order that you put them on, if you take both cables off at the dead battery and they touch you are going to be having a bad hair day. the thing that most people don't get is you have to have a good clean convention. If you don't try wiggling the clamp on both batteries to make them dig into the terminals. Also there is a huge difference between someone who left the lights on in parking lot and someone with a dead battery on the side of the interstate. The guy in the parking lot has a dead battery, the guy on the side of the road has a dead battery and a dead alternator, he needs a tow truck, not a jump.

Jan 25, 2011 | 2006 GMC Canyon

3 Answers

Trying to change battery; sparking occuring

Hi Real,

Right, left, don't care. What matters is positive to positive and negative to negative.

Important: Wear proper eye protection when working with batteries.

The negative cable, regardless of color is the ground. It will be the one that is attached to the engine block, frame or both. It gets connected to the negative battery post, marked with a minus (-) sign. The other is positive..

If it sparks when you try to connect, that means something is drawing power. Make sure everything is off. Then try it again.

Comment me back with any remaining symptoms.

Best regards,

Feb 04, 2009 | 1995 Ford Taurus

1 Answer

Car just died after putting new starter

When you put the new starter in, you didn't put one of the cables back on the post. It probably grounded itself enough to start and run, then moved by vibration, or a pothole, or gravity, and killed the motor. As for the arcing battery.... are you sure you didn't attach the jumper cables to the wrong posts?  

Jan 05, 2009 | 1997 Nissan Pickup

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Why did my car try to start on its own

Assuming that the solenoid was installed correctly I have to say that you purchased a faulty solenoid.

Dec 05, 2008 | 1988 Ford Thunderbird

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I've done it already anymore ideas

Before I even start here. I've got to tell you, you provide the best info / details / descriptions of any one I've tried to help on this site. I wish they all would get a clue from you. Thanks.

Back to the problem.You are closer to the solution than you think.

The fact that you can jump start it rules out everything except the Battery and the negative cable. Everything works when you bypass these.

Rule out the negative cable by re-jumping, only this time attach the negative jumper to the negative terminal of the battery.
If it starts, With the jump, It's the battery. No Doubt.

By all means, bring it back to where you purchased it (Autozone?). Have them check it. Tell them whats happening, they'll exchange it.

I've gotten two more people in the last week who had replaced the battery (Oh No, it can't be the battery), only to find the new one was bad. It happens.

When it turns out to be the battery (or cable), I expect a 'FixYa'. Fair?

Good luck, you'll be on the road tomorrow.

Aug 10, 2008 | 1987 Jeep Wrangler

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