Close
How to diagnose problem
1990 Lexus LS400

How to diagnose problem

(1990 Lexus LS400)
I replaced a dead battery and afterwards the cars starts but the auto transmission is locked in park position and headlights and other electrical devices don't work.
1 answer & 6 comments
Popular Answer
on January 27, 2016
IF there were no problems before the battery swap.. It's usually the result of reversing the battery cable polarity (even for a millisecond) when installing another battery, which in turn usually results in blown fuses that will need to be tested to find out how many have failed.. 'IF' this actually IS the problem ... Shame on you!
Sign in to reply
on January 27, 2016
Thanks for the comment, but I am conscious of the polarity. I suspected that one or more fuses were blown.
Anyway I just checked and the battery is connected correctly. Maybe the guy that charged the new battery got the polarity wrong. Do you agree? Isn't the shifting lever in an automatic transmission, purely a mechanical device? It is locked in the park position.
on January 27, 2016
Hey , I'd blame the other guy too (lol) .. No offense intended.. It's just that we see 'way too many' post of battery cable reversal on here.... There is a 12 volt solenoid that releases the shift lever when the brake pedal is depressed.. that fuse is likely bad... The best thing to do is to TEST every fuse you can find on the vehicle with a 12 volt test light.. Then you'll know where you're at... Google > test auto fuses with a test light... Then on the results page, click on the YouTube video to see how it's done, can't hurt... Good luck with it!
on January 27, 2016
Thanks for the info.
With regard to the polarity, installing the battery on my car is idiot proofed as the cable positions and lengths will not allow them to be connected improperly.
Do you have an opinion about the possibility that the new battery was charged with the polarity reversed ?
The charging was done by a very experienced guy at the Good Guys store.
on January 27, 2016
What if the 'battery' were turned around the other way?... As for what happened prior to this, I can't say for sure but it's just too much of a coincidence that all those electrical accessories are not working immediately after the battery swap... Testing ALL of the fuses is all I can recommend.
on January 27, 2016
No the battery cannot be installed backwards because of the positions and lengths of the cables. Any way I will replace the fuses and see what that brings. Thanks
on January 27, 2016
Don't start replacing fuses... TEST the fuses with key on to see which ones have failed!!!
Automatic Transmission Diagnosis
$88 - $111 Learn More
on January 27, 2016
IF there were no problems before the battery swap.. It's usually the result of reversing the battery cable polarity (even for a millisecond) when installing another battery, which in turn usually results in blown fuses that will need to be tested to find out how many have failed.. 'IF' this actually IS the problem ... Shame on you!
Sign in to reply
on January 27, 2016
Thanks for the comment, but I am conscious of the polarity. I suspected that one or more fuses were blown.
Anyway I just checked and the battery is connected correctly. Maybe the guy that charged the new battery got the polarity wrong. Do you agree? Isn't the shifting lever in an automatic transmission, purely a mechanical device? It is locked in the park position.
on January 27, 2016
Hey , I'd blame the other guy too (lol) .. No offense intended.. It's just that we see 'way too many' post of battery cable reversal on here.... There is a 12 volt solenoid that releases the shift lever when the brake pedal is depressed.. that fuse is likely bad... The best thing to do is to TEST every fuse you can find on the vehicle with a 12 volt test light.. Then you'll know where you're at... Google > test auto fuses with a test light... Then on the results page, click on the YouTube video to see how it's done, can't hurt... Good luck with it!
on January 27, 2016
Thanks for the info.
With regard to the polarity, installing the battery on my car is idiot proofed as the cable positions and lengths will not allow them to be connected improperly.
Do you have an opinion about the possibility that the new battery was charged with the polarity reversed ?
The charging was done by a very experienced guy at the Good Guys store.
on January 27, 2016
What if the 'battery' were turned around the other way?... As for what happened prior to this, I can't say for sure but it's just too much of a coincidence that all those electrical accessories are not working immediately after the battery swap... Testing ALL of the fuses is all I can recommend.
on January 27, 2016
No the battery cannot be installed backwards because of the positions and lengths of the cables. Any way I will replace the fuses and see what that brings. Thanks
on January 27, 2016
Don't start replacing fuses... TEST the fuses with key on to see which ones have failed!!!

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
Engine revs without increasing speed. sometimes the car shakes slightly before moving. check engine just started to...
So my jeep broke down on the interstate and was blowing white smoke out the exhaust and cut off on me. it was...