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

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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

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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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1 Answer

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?

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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.

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I plugged in a code reader into my 1996 chevy 1500 2wd 4.3L and it came up as a cam position sensor. i bought a new one from autozone and replaced it. i put it all back together. and now the truck wount...


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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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Car won't start and battery is fully charged and cables are not loose. What else should I be looking at? We just had the rear brake system completely replaced.

Items to check out Battery and battery cables (Load test battery and make sure cables are clean and tight especially the B+ cable off the starter).
Listen to the cranking speed of the starter. Does it sound normal or slow? Depending on what you hear you may want to do a starter current draw test or have a shop do it for you.
If all of the above are a-ok then move onto fuel and ignition checks.
When you put the key into the ignition and turn it to on position do you hear the fuel pump buzz?
No buzzing sound ... you could have either a bad fuel
pump or relay. Either way the vehicle is going to a shop for further diagnosis and repair.
Ignition check WET WIRES will usually give you a misfire unless the coil pack they are attached to was submerged in water. Then you may have major engine problems like a hydro locked engine.
Dry off or replace wires and look over coil, totally saturated may be worth replacing.
Pull off a spark plug attach it to its wire and ground its electrode . Crank engine and look for spark.
No spark! Now check plug wires and coil. How use shop manual for correct testing procedure .
If no spark is found coming from the coil then check B+ coming from battery to coil and ignition module.
Lastly not likely but ignition switch should not be left out of the equation. Your gonna need the shop manual for that. good luck

Mar 31, 2010 | 1999 Toyota Sienna

1 Answer

Wont turn over after new starter fitted hv can only jump start by turning over at starter

hello there, i was wondering if your starter has a solenoid attached on top of it? if in which case it has, on the solenoid you'll possibly see 2 hex screws on the rear portion of the solenoid. a size 12mm hex screw. attached to one of the screw is a short wire guage 8 or guage 6 coming out of the starter. the other screw should be directly attached to the positive terminal of the battery using a heavy guage battery cable. a protruding terminal with a philipps screw or a terminal lug connector is for the starter switch. you could test you starter if you attach a guage 14 wire from that terminal lug and try to directly swipe it on the positive terminal of the battery. warning! this might produce sparks. keep flameable solvents, gasoline and other materials that might ignite away from your testing area. be careful, the heavy ampere output of the battery can burn cables instantly. so do try to keep the positive cables away from the body of the starter which is the negative side of your starter.

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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.

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1985 Toyota Cressida

on average removing a starter isn't that bad... normally 2 bolts and the wires from the battery... BUT... sounds as though you may have a problem with the starte's friend.. the solenoid switch... i looked one up on and the part # is SS725 and it costs right at 100 bucks... definately try to test the old one first... turn on your ignition switch car in park if auto neutral if stick (e-brake on) and get a heavy guage wire or something to conduct electricity and touch across the 2 thick posts on the solenoid switch... small black thing in line of your positive battery cable to your starter... be very careful when you touch across it will most likely spark and the engine should turn over fine... if it does,, replace solenoid switch... rather costly solenoid but better then going to a shop.. hope that's al it is

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