Sami Tilander

I'd assume that US has more GS350 models than Europe... quickly searched the Ebay with part number 8824030420 and there was few used modules available... BR.Sami

I had the same trouble... I was also considering buying the RHD module, because I ended up to the same conclusion that the only difference might be the mounting bracket. Luckily I found one LHD ecu with reasonable price. Have you checked the Ovoko? They seems to have two LHD modules right now: https://rrr.lt/en/search?q=8824030420 BR.Sami

The radar seems to be same in GS350 and GS450h. I don't free access to the wiring diagrams, I've been using the official Lexus-Tech documentation: https://www.lexus-tech.eu/OnlineSubscriptions.aspx It costs only 5€/hour (+VAT)... BR.Sami

Which Distance Control ECU did you get for GS350? I checked from Amayama the part numbers and it seems that GS350 and GS450h have different variants of this ECU: https://www.amayama.com/en/genuine-catalogs/epc/lexus-europe/gs350/GRS190L/3953/electric/8408 GS350 should have 88240-30410 (RHD) or 88240-30420 (LHD), but GS450h has 88240-30460/30470... Might cause the problem? Br.Sami

I was checking the wiring diagram for radar cruise, and I noticed that one wire to the radar comes from Hybrid Vehicle Control ECU. I and Ollie seems to have GS450h models, but you mentioned that you have GS350? Could you check that this wire is connected to somewhere in your car? That diagram is probably for GS450h, so I don't know if it is valid to GS350 or not... but maybe one thing to check...

If I remember right, it took several attempts to get it changed. Don't give up, you are very close! If you are able to access the Distance Control ECU with TechStream, that should be working correctly. Double-check the wiring between radar and the fuse box. BR.Sami

Whole Europe uses 433MHz accourding to https://en.wikipedia.org/wiki/Direct_TPMS Tire shops have handheld scanners to read the sensors, but if those are out-of-battery already, that does not help. BR.Sami

Amayama? https://www.amayama.com/en/part/toyota/g904030010 (does not include taxes, import fees, etc, but might be still cheaper...) BR.Sami

Not maybe the easiest, but I replaced the fog lights of my GS450h with LED DRL+Fog lights combo. See this old thread: BR.Sami

The "Check System" message indicates that car's ECU cannot communicate with one (or more) sensor in the wheels. Possible causes: sensor out of battery, sensor ID wrongly programmed to ECU, no sensor at all, ... A decent tire shop should be able to scan the sensors to see if they are alive or not. BR.Sami

Small update on this: I finally managed to sort out the steering wheel topic... I only changed the stalk (with "mode" function) and hacked the wiring harness so that the same "mode" function on stalk can be used to control the "distance" of radar cruise. Now it works so that a short push on stalk changes the distance and a long push switches between radar/normal cruise modes. I was ready to sacrifice the "mode" functionality as I have never even used that, but there was no need for that... BR. Sami

TPMS sensors are available in two frequencies: 315MHz and 433MHz. If you looking international websites, ensure that those TPMS sensors are using the correct frequency...

About the TPMS warning: are you getting also message "Check System"? If yes, then the car's ECU cannot communicate with the TPMS sensors (one or more) of the wheels. You mentioned about new tyres: did you also got new sensors? Were they properly registered to the ECU? BR.Sami

The "Check System" message means that TPMS ECU cannot read the sensor. If you have not changed anything, it is very likely that one or more sensors are running out of batteries. They last about 10 years. BR.Sami

You still need to find out the culprit... Batteries do not "sent out power too intensely", but there is a short-circuit somewhere. If you don't find that, it will happen again even with standard 12V battery... If the main fuse is blown, the short-circuit must be in the wires leading from battery to the other fuse boxes. That narrows down the search a bit. One thing bothers me: if your main fuse is blown, how the interior lights can work? BR.Sami