AdBlock Warning

Parts of this website do not function properly with AdBlock enabled on your device. To get the best user experience on our website, please disable Adblock for this website (domain) on your browser.


Recommended Posts

My rear brake lights, including the centre light in the rear window are all on and cannot be switched off. Even when the car (like now) is sat parked, locked, and generally powered down.

 

The car drives otherwise normally, there are no warning lights on the dash or messages of impending disaster. Economy seems unaffected so I’m satisfied the actual brakes are not on. The cruise control doesn’t work in either radar or normal mode. Presumably because braking normally turns cruise control off.

 

The brake lights seem unaffected by actual braking, acceleration, or indeed anything. To anyone following me it looks as if my brakes are just on constantly.

 

The only reasonably unusual thing that happened is I had to brake sharply on the motorway today. This did activate the pre-collision and brake assist but it was all over in a few seconds and I carried on my merry way. I wonder however if my lightning fast, ninja fighter pilot reflexes have confused something (brake pedal switch?) which is causing this weirdness.

 

I’ve booked the car into Lexus Cambridge later this week for them to take a look, but any suggestions in the meantime would be gratefully received.

 

 

Sent from my iPhone using Tapatalk

Share this post


Link to post
Share on other sites
 

This has just started happening right?

Take a look at the switch on the brake pedal, maybe it needs adjusting? They often have a lock nut and can be wound out a turn or two before nipping the lock nut back up.

Or to check if the switch is faulty, try unplugging it and see if the brake lights go out.

Will be interested to hear what the issue is and how it's resolved.

Good luck.

  • Like 1

Share this post


Link to post
Share on other sites

Sometimes the switch plunger sits on a plastic stop that can occasionally work loose. Have you recently found any odd bits of plastic in the drivers footwell?

Share this post


Link to post
Share on other sites

My money is on that switch, just as Farqui says.

Braking very quick can also lodge crap between plunger and it's recess, thus trapping the plunger in the retracted position and thus leaving the lights on.

I'm not sure though if the light circuit is powered when car off and shut, powered down completely though. If they are, then above still works. If not, then I suspect a short somewhere, allowing power from another circuit to flow through the brake circuit even if switch is not pressed.

Start with the switch though, much easier lol

  • Like 1

Share this post


Link to post
Share on other sites

My money is on the switch. I'm sure the brake lights work without the ignition on.

Share this post


Link to post
Share on other sites

Thanks gents, I think you're all on  the money with the switch.

Current problem is a bit more immediate.  The ****ing thing won't start.  Clearly having the brake lights on all night has flattened the battery.  Dead as a door nail.

At the moment I'm sat at home waiting for the AA man to arrive.  Lexus warranty and recovery proving useful...

Share this post


Link to post
Share on other sites

Doh, how annoying.

While you're waiting you could take a look at the switch :wink3:

Share this post


Link to post
Share on other sites

All sorted. The AA man duly turned up, faffed about under the bonnet looking for a way to jump start the car before managing to power up the fuse box, which allowed him to open the boot, which allowed him to get to the battery, which allowed him to start the car.

He then brought his skills and spanners to bear on the brake pedal switch, and has adjusted it. which was apparently all out of alignment and not working properly.

As it stands the car is working normally; brake lights not on (unless I’m braking), cruise control working, and everything peachy.

I’ve cancelled the appointment with Lexus tomorrow.


Sent from my iPad using Tapatalk

  • Like 1

Share this post


Link to post
Share on other sites

Excellent news, well done mr AA man.

Interesting point about no power to the 12v battery, isn't there a key option to access the boot? - slopes off to Google...

Share this post


Link to post
Share on other sites

Yes, there is a key slot just near the normal hand pad. But as it's soft closing it might still need electric.

Share this post


Link to post
Share on other sites

Lee,

Did this key slot come in with the 2008 model them? My 2007 does not have it.

John

Share this post


Link to post
Share on other sites

21 minutes ago, OldTrout said:

Lee,

Did this key slot come in with the 2008 model them? My 2007 does not have it.

John

Nor does my 2010 have it and there is no mention of it in the Handbook.

 

Regards

John

Share this post


Link to post
Share on other sites

Really, it's on the left hand/nearside of my boot lid. 

It wasn't initially obvious it's there as it's thoroughly covered in black goo.

Share this post


Link to post
Share on other sites

Glad you sorted it Andrew, although I'd have pulled some fuses or disconnected battery if they'd be stuck on before leaving any time, to save that faffing!

 

I have the key hole, I think, on a 2006, will have a look. Seems stupid to not have it when battery in boot, unless there a manual release elsewhere? Like the little pull cords that are behind trim panels etc. Be crazy if it closed with no battery installed, or when disconnected, be stuck forever then as couldn't get power in via anywhere else if no circuit to be made.

Are these cars common ground or common positive? Assume the former, but not done anything to establish it yet.

Share this post


Link to post
Share on other sites
13 hours ago, Upex said:

 

I have the key hole, I think, on a 2006, will have a look. Seems stupid to not have it when battery in boot, unless there a manual release elsewhere? Like the little pull cords that are behind trim panels etc. Be crazy if it closed with no battery installed, or when disconnected, be stuck forever then as couldn't get power in via anywhere else if no circuit to be made.

 

It's only the 450's that have the battery in the boot so wonder if the boot locking is different on them?

Share this post


Link to post
Share on other sites

Just to add my twopence worth I have opened the boot of mine with my key using this lock when I experienced a flat battery. It is to the left of the left number plate light unit. The picture posted by Lee above shows it in the location that houses the camera on right hand drive models.

  • Like 1

Share this post


Link to post
Share on other sites
4 minutes ago, Chris111 said:

Just to add my twopence worth I have opened the boot of mine with my key using this lock when I experienced a flat battery. It is to the left of the left number plate light unit. The picture posted by Lee above shows it in the location that houses the camera on right hand drive models.

Good to know Chris, thanks.  

The more eagle eyed observers will note that my pic was from the LS with the boot key on the RHS.

I couldn't find a pic of the key on the GS 450H, note to self; must try harder...

  • Like 1

Share this post


Link to post
Share on other sites

Yes I have it now. Camouflaged by some black stuff.

It does work but when I turn the key I hear the motor whirl so would this work if the 12V battery were flat?

John

  • Like 1

Share this post


Link to post
Share on other sites

I should also add the instruction is on page 457 of my owners manual.

Share this post


Link to post
Share on other sites

1 minute ago, OldTrout said:

It does work but when I turn the key I hear the motor whirl so would this work if the 12V battery were flat?

Yes because I have done it.

Share this post


Link to post
Share on other sites
2 hours ago, OldTrout said:

Yes I have it now. Camouflaged by some black stuff.

It does work but when I turn the key I hear the motor whirl so would this work if the 12V battery were flat?

John

Exactly my thinking.

Share this post


Link to post
Share on other sites

Given it was my issue that started this discussion, the least I can do is show a picture of my key access to the boot.

59cd85f662990c994a818643b19052cf.jpg

The AA man’s databanks apparently didn’t know the GS came in hybrid form hence why he had some of the challenges he did.

Either way, all’s well that ends well.


Sent from my iPhone using Tapatalk

  • Like 2

Share this post


Link to post
Share on other sites
1 hour ago, stevet said:
4 hours ago, OldTrout said:

Yes I have it now. Camouflaged by some black stuff.

It does work but when I turn the key I hear the motor whirl so would this work if the 12V battery were flat?

John

Exactly my thinking.

For info page 457 of the GS 450h owner's manual instructs to open the boot this way if the keyfob battery has discharged and page 459 also instructs to open the boot this way to access the 12 volt battery if that has discharged. As per my previous post I have done this so I know it works.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now