the_biggster

Holy thread resurrection! I was contacted through eBay and asked about this. I found this thread (which I had totally forgotten about) and saw there was an unanswered question. I taped the sensor to the new 12v battery with electrical tape. This worked fine :) Good luck all

It's all sorted now! Can't tell you how relieved I am. It turns out the original 12v battery has another 2 pin connection for (I think) a temperature sensor. I removed it form the old battery and stuck it to the new one - all fine again! Now, back to enjoying Lexus ownership :)))))

I've solved the problem! The extra 2 pin connection on the 12v battery is (I'm pretty sure) a temperature sensor (thermistor) that I removed from the old battery, stuck to the new battery and then ed it up! After disconnecting the negative for a couple of mins then reconnecting it - voila! No more "Check Hybrid System"! I guess it would be safe to say that the "Check Hybrid System" warning can come on for the smallest of reasons! I hope this post helps others who need to change their 12v battery but don't want to pay Lexus £135 for a new one (not fitted!). Cheers

Thanks Ahmed. The idea of 5.7 secs 0-60 time and 30+ MPG really appealed! When you put your foot down, it is unbelievable - it hesitates for a moment while the electric motor shoves you forward, then the petrol engine kicks in and all hell breaks loose! This is my first Lexus (having upgraded from a Prius) and I have to say I am very impressed. Not impressed with main dealer prices though - £1k for front/rear discs/pads fitted!! Jokers! I'm going to have to get down there and get my battery problems sorted out (see my other post) so my wallet is not looking forward to that! Cheers

Here's a pic of her:

Hello all. I bought my 2007, 66k miles GS450h last weekend. Am really pleased with her, a great machine. However, I went to start her on Thursday evening and the hybrid system would not start. Instead, the dash said "check vgrs" and the ready light did not come on. I thought that this could be an indication that the 12v battery was low and so I boosted it with a battery booster pack I had, and sure enough it started up fine. I took it to a motor parts shop yesterday morning who tested the battery and it was only putting out 10v and was emitting a fizzing sound under the load test, which apparently means it has a fizzing cell and needs replacing. So I got a new battery from the shop, which they fitted. However, during fitting, we discovered that the old (OEM) battery had an additional connection to a small, two pin plug (thin cable) which the new battery did not have (I have never seen this connection before). We left it disconnected. Upon starting the car after the battery was fitted, all systems start up fine, and the hybrid system says "ready". However, the display says "check hybrid system" and the master warning light is lit. No amount of turning on/off the system, opening closing doors, disconnecting and reconnecting the battery stops the check hybrid message just after I start the car. The car seems to drive just fine, but the display does not show the hybrid system energy flow and the warning light does not go out. I figure I'll have to take it into Lexus, but does anyone have any advice on: 1. What is the extra connection on the 12v battery for? 2. Anything else I can try to trace the fault/extinguish the warning light? Many thanks in advance, Simon

Hello all, I am the proud owner of a 2007 GS450h as of last Saturday :) I've been having some problems with it since picking it up (will post those separately) but when it works, it's absolutely superb! Will chuck a couple of pics up if there's an easy way to do so. Greetings to you all! Cheers, Simon