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Discussion Starter · #1 ·
Hello All,

Sadly this is my first post here on the forums. I actually have a 2015 RC350-F, however, I'm posting in the IS section in hope to get more views/responses, hopefully from a Lexus Tech. Started with a trip to the vet for a sick animal. Hours later we left, tried to start my RC, only fast clicks, but I could still power accessories like the moonroof. So I'm positive it was the battery. I noticed that I've lately had a habit of hitting the damn touch-activated passenger maplight when closing the moonroof, and think I left it on overnight.

AAA said 2 hours for a jumpstart, and the vet was getting ready to close. Couldn't find cables from any of the animal hospital employees. Anyway, got a ride back to my house to grab the girlfriend's truck and jumper cables and headed back. It's been a long day for me after having been up all last night with a sick animal, and being at the vet all day.

So I went to jump my car from my girlfriend's Audi Q3, and not in my right mind, I figured the covered battery post was the positive as it is on most cars, but no - Audi covers the negative terminal for some reason. In the end my fault.

TLDR - I ended up connecting the wrong cable clamp to the wrong terminal on the Q3, connected to my RC, and the cables got fried. Disconnected them as quickly as I could but now my RC has no power whatsoever to even unlock the doors, but I did notice the vehicle proximity warning lights on the mirrors lit up before it completely died. Her Q3 is completely fine. I know my battery is toast, and I was going to replace it anyway, but someone please tell me that the main fuse/link should have caught this before doing any serious damage to the ECU, etc. I forgot to check the fuse box before we left, as my mind was about shot at the time.

Thanks in advance for any input.
 

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It's never good to hook up jumper cables wrong. You might have fried more than you think when you
get this thing checked out. We all hope for the best. You're damn lucky you avoided a fire situation or
battery exploding. Let us know what you find out. Good luck. Have her car checked out as well, can't hurt.
 

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Discussion Starter · #3 · (Edited)
Very strange result. Went back to the car, checked the fuses - not a single one blown. Had AAA show up for a tow; driver asked about the issues...Hooked-up his booster pack to the battery and put the key to the start button (which I know about if the smartkey battery is dead), and the car fired-up. Drove it home 9 miles with no issues. Came back an hour later and it started with no issues. Haven't had a chance to check the actual voltage of the battery as of yet, but it did sound a little weak when I started it.

Update: Battery voltage at rest today is measuring 12.2. Technically low, but still amazing. No electrical issues whatsoever. Went to the dealer to test drive an RC-F, and upon evaluating my car for trade-in (a shitty offer even in this market, and I told them that), they found no issues. Also went to Audi, who offered more for my car on trade for a 2017 RS5. Very strange indeed.
 

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Very cool. I think you got lucky. I might spring for another battery and check cables going to starter.
As far as trade-in value, you could go to several dealers and get different prices on the trade.
Always depends on the price of what you're buying. If they have it priced up, you might get a
higher offer. Glad you're back on the road though
 
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