Strange Problem On Gs450h

gareth1902 · June 26, 2015

In an nutshell I had a rear DVD system installed around 2 months ago. All went well but about 5 mins after I drove off and left the place I had the tyre pressure warning come up on the dash saying "Check system". Obviously I got out to check the tyres but all were fine so carried on driving home. As it happened so soon after having the rear DVD system put in I naturally assumed that the guy may have accidentally disturbed a wire or a fuse relating to the tyre pressure system. It stayed on for around 2 weeks then suddenly went off for a few days. I assumed the gremlin had righted itself. However it then returned and has been on ever since.

However a trip to rectify the fault at Lexus today only complicated things further. They do not think the issues are related at all and say installing a rear DVD system is impossible to disturb the tyre pressure system. Furthermore they said that the car "wasn't communicating" (whatever that means). They say all other ECU's are working normally and the car is perfectly driveable apart from this annoying message saying check system.

They want to strip down the system and they think all 4 pressure valves may have gone at a cost of £504 and want to book it back in.

I know it's a long shot but before I part with half a grand just wondering if anyone out there has any suggestions that Lexus may have overlooked.

Thanks all!

cruisermark · June 26, 2015

i cant help with an answer but i would question how all 4 valves have become faulty all at the same time - if the system is similar to the one in the 430 then it has had a very short life -

all the best

gareth1902 · June 26, 2015

i cant help with an answer but i would question how all 4 valves have become faulty all at the same time - if the system is similar to the one in the 430 then it has had a very short life -

all the best

Must admit that when they told me that they suspect all 4 had suddenly gone I began to smell a rat. Just doesn't sound plausible even though they said that it is fairly common. I am a car novice but it just seems to me to be more likely an electrical issue related to the DVD install which contradicts what Lexus say.... Thanks for your reply!

cruisermark · June 27, 2015

does your car have the TPMS reset button under the dash?

gareth1902 · June 27, 2015

does your car have the TPMS reset button under the dash?

Yes but doesn't seem to do anything. tried holding it in or just pressing it quickly. Nothing

Mike Hartland · June 27, 2015

What seems strange to me is that they are only quoting £504 when the going rate seems to be be around £200 per wheel with Lexus.

It certainly sounds like a similar problem to what I had, whereby one sensor went and no matter what I did with the reset button, I couldn't clear the message. Lexus should be able to plug in the car and diagnose exactly which of the four sensors have gone so it is worth asking them what they are on about.

Once fixed, I only have to pump up the tyres (if the warning comes up) for the warning to disappear, without recourse to the reset button.

KayCee · June 28, 2015

have you had the trim off around the gear lever as the tpms cpu is under there it could not have been connected or cable trapped worth checking

reason why i say this when i purchased my car that light was on and nothing would turn it off so i walked away man said ill knock 200 of price and you can get it sorted yourself

He then rang me and tried again to sell it me but i said you get it error free and ill think about it

Any way the upshot was he did put it into Lexus stoke who said the CPU as gone cost 500 so they did it

But i did ring him and asked if it was a common problem and he said people disturb the plug/wires fitting stuff in there

So now it was fixed and i bought no trouble since