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jonathanhague posted a topic in Lexus GS 300 / Lexus GS 250 / Lexus GS 430 / Lexus 450h / Lexus GS 460 ClubHi all, Just wanted to post a quick review regarding Hybrid battery conditioning. I think it was off this site I learned of Hybrid Battery Solutions based in Northampton who I contacted after getting a diagnostic from Lexus. The car lost it's initial surge of power from the battery and would always move off using petrol engine only. Battery indicator would drop to purple very quickly. MPG dropped from about 29/30 to 23-25mpg. I had a CHECK HYBRID SYSTEM message, but it was solid - not flashing check VSC etc as others have described. Lexus ran two separate diagnostics and said it was a smart battery ECU which needed replacing at a cost of £1250 + vat. They gave me a print out of the error code and when researching online it was more common that it was 'Battery pack seriously deteriorated'. I couldn't find much literature regarding the smart battery ECU other than a workbook note suggesting that this is replaced first then if this doesn't work, the battery pack should be replaced. Not knocking Lexus at all but I wasn't overly convinced or filled with confidence. My car is probably only worth £3000-4000 (ambitious?!) and has 150k miles so didn't want to pay for this smart battery unit and then a battery if it didn't work! Using my logic I thought it was more likely than not to be the battery - after all, all batteries do degrade and this seemed to be much much more common when looking online. I contacted Richard at Hybrid Battery Solutions in Northampton who gave some advice and we had a chat about hybrids generally - in fact, we didn't even discuss him 'selling' me his service until I asked (always a good sign I think!). Anyway, cutting to the chase I drove from Teesside to Northampton and averaged 26.2mpg. Left it with Richard for the week and I was astonished when I got it back. It felt like it had been remapped - it was better than before (probably cause I never had from brand new myself). On the same journey back (about 190 miles) I averaged 38mpg. Even after almost a week of short journeys, spirited driving (and traffic light drag racing again ) I am still on 33.4. I am almost gutted that I didn't go for the grid charger (which I think uses some kind of witchcraft to keep the battery cells in their best possible condition) but I might well need a bigger boot to fit a pushchair later on in the year so the car might go although with hindsight, this would have been a good selling point when selling the car. He can do this separate from conditioning I believe or both at same time. It has given me confidence to go and buy another higher mileage hybrid. There is a solution which is significantly cheaper than Lexus and urge others who were in my situation to have a look at this. Hopefully this isn't breaking any forum rules - it's just my experience of this company and that others find it informative.
I got the dreaded Check Hybrid, Check VSC and Check EBC warning lights. Fault code readings P0A80 Hybrid and P3017 (battery cell block number 7 fault). Having gotten a quote for around €6000 to fix it, I decided to do it myself. I ordered a battery cell on ebay for €45.00 delivered to Ireland. Tools needed: Socket set with 8mm, 10mm and 12mm. Flat head screwdriver, long nose pliers and a multi meter to read voltage. (You may also need a slow trickle 12v battery charger, I'll explain later). Time needed: about 4 hours, more if your connections a very dirty. 1: Remove ALL carpeted paneling from the boot (trunk if you're in the US). This is done by inserting the flathead screwdriver into the black plastic rivets and popping them out. Remove the boot flooring too, just leave the tool tray in place. You will need the 10mm socket to remove the rear boot floor luggage anchor points once you've popped open their plastic covers. The upper hanging points need to be squeezed to remove. Disconnect the power supply to the light on the right hand panel. 2: Remove the orange circuit breaker on the HV battery by sliding to the right and then pulling towards you. 3: Remove the black air duct on the bottom of the HV battery by popping the 2 black plastic rivets. 4: Unplug the power supply to the white cooling fan on the upper right of the HV battery and remove the 2 nuts holding on the fan. This should allow the 2 upper black ducting to move sufficiently to be able to remove them. 5: Open the panel covering the 2 Orange Cables (3 x 8mm nuts) and disconnect the 2 orange cables, (you can tape them up with electrical tape if you so wish). Pull back the rubber cover on the Black cable and unbolt that too. You should now look something like this: 6: Disconnect the cable running from the HV battery to the 12v lead battery. Continue to remove the 12v battery by disconnecting the +ive and -ive terminals and the white connector plugs attaching it the the HV battery. Also need to take off the temp sensor and the vent hose on the 12v battery. Remove the 12v battery support bracket and the battery tray itself. 7: Remove the last 2 bits of black ducting that was clamped by the 12v battery tray. 8: Remove the white tubing on the right of the HV battery. 9: Remove the 4 12mm nuts holding the base of the HV battery in place, 2 on each side. 10: You need to unbolt the nuts hidden behind the back seat headrests. 11: Pull the rear seats forward enough to remove the large plastic panel in the center between the rear seats and the boot wall, its hidden behind the fireproofing fabric. Use this panel cover to hold the seats away from the boot wall by wedging it between seats and wall. 12: Pull back the fireproofing to reveal 2 smaller access panels covered by a black sticky rubber square. Now remove the 3 12mm nuts holding the HV battery to the boot wall. 13: Now the tricky bit, lift the HV battery over the bolts in the boot and slide it out. (I recommend putting cardboard on the tool tray to avoid scratching when sliding the HV battery). If you are strong enough you can lift the HV battery out on your own, if not get help, it weighs about 50 kilos. Your boot should now look like this with the access panels behind the seats visible: You should also have this, I placed mine on some cardboard on my kitchen table: 14: Take off the HV battery cover by opening all the 10mm nuts, and a few 8mm. unclip the black cable while taking off the three cover panels. 15: Unclip the black plastic covering on both sides of the HV battery to reveal the 8mm connector nuts in the orange casing. 16: Number the cells 1 to 40 using a permanent marker. Use your multi meter to get a reading across each of the 40 individual cells, i.e. one lead on the +ive terminal of the cell and the other on the -ive, and record your findings, as you can see cell 28 was low for me: 17: Pull back the rubber vent tubing running along the top of the HV battery until to get beyond your bad cell/cells. 18: Remove the white end panel holding the cells in place: 19: Remove the 80 x 8mm nuts in the orange casing and clean if necessary. I used bleach and some sand paper to clean all nuts a copper plates, if you're gonna do it - do it right). 20: Remove the 8mm nuts holding each cell in place underneath until you reach your bad cell (this will probably involve removing the support leg and the converter assembly unit below the HV battery: 21: Good cells look like this Bad ones like this: 22: Start replacing your cells back into the HV battery, it doesn't matter what order and you can't mess up polarity as it only screws in on one side. I put my new cell in last in case it was a dud. (If your new cell is of a lower or higher voltage use a slow trickle 12v battery charger to get it to the same voltage as the other cells. 23: WATCH THE TEMP SENSORS UNDER THE BATTERY CELLS (3 of them), MAKE SURE YOU CLIP THEM ON AS YOU GO. See the black plastic clip peeping out here: 24: That's it you're done, just reverse everything to put in back in. Mind your back and don't bother touching cell 1 and 40 at the same time if you have the orange connector put back on. Good Luck!
rikardo82 posted a topic in Engine & TransmissionHi I have lexus GS450H today got error Check hybrid system, it happened like this, I stopped started to drive then energy monitor went blank engine did not started it drive on electricity only I pressed accelerator hard enough and engine should started. I stopped, restarted hybrid system then engine started immediately (battery was 2 bars) then droved home 30 miles there was steep decent for some time battery went even to 7 bars so it charged but I expected to get it full it was ~20 mile down from 1.7KM to sea level, then when was in city noticed that hybrid did not worked as always engine all time worked even when stopped when started from complete stop also petrol engine worked, it stops only when I'm stopping releasing accelerator pedal and when car stop engine start to work again (battery was 5-6 bars at that time) I know there are charging cycles etc but no matter how long i droved it petrol engine worked all time (temperature was +16Celsius air condition off no heating etc) , for very short time when starting to drive sometimes also only electric motor only work but very short time like 10-15 seconds. Then after 10 min when I was home started car again now check hybrid warning disappeared I checked with computer I have techstream software and there was current and historical error P0A92 - hybrid generator performance I cleared that code also then test drived again and still petrol engine all time worked, now went home waited like 30-40 minutes went for test drive again this time everything was perfect petrol engine was shut down when droved in parking when accelerated gently then also it was off etc. So this time hybrid system worked perfectly fine. Problem probably still is and I dont want to make now any unnecessary trips if something like that happens one time it most likely happen again. So what do you think is there potentially big problem ? I now think about selling that car while it still running dont want repairs costing thousands or maybe there is not so big problem? Also want to ask if that was ok when I went downhill petrol engine obviously was off and I braked with gearbox by switching gears down I doubt its something wrong but still maybe it's not recommended to do so maybe that somehow overheated generator? Also when just returned home and car hybrid still badly worked when I switched hybrid on and engine not yet worked (it went on after 10-20 seconds) there was some ticking noise from bottom front? Is that normal? When just went for last test drive seems that noise was not so big but still was... Car has 110000 miles serviced in lexus dealer till 90000 miles last service was done in other garage at 100000 miles I bought it very recently droved only 500 miles. Waiting for your answers thanks