Brake Lights don't work when headlights are on

[BuffaloBob]

I have been getting faults and warning lights all over the place.
I have narrowed it down to when the headlights are turned on, the brake lights don't work.

When the headlights are off, the brake lights work perfectly.

I have no idea what is causing this.

"Transmission fault, action reduced" causes the transmission to not get out of first gear, however, when I put the LR3 into "Sport" (manual mode), the transmission works perfectly.

Help!!! any ideas?

(I already tried to switch out the stop light switch.)

 

[schwaggy]

Take out all 4 2-filament bulbs in the cluster - make certain no corrosion on base and connector and the 2 filaments in each bulb are still in tact.

 

[umbertob]

Were one or both brake light bulbs replaced recently? Are they OEM bulbs? Non-OEM bulbs can cause all kinds of issues, the symptoms are similar to a faulty brake lights switch. If in doubt, buy 2 new bulbs from your dealer and, as noted above, make sure no corrosion is visible in the sockets of the tail lamp clusters.

 

[bbyer]

trouble shooting tip

The odds are the problem as suggested is something to do with the bulbs in the rear tail light assemblies - could also be with the reverse bulbs by the way.

As such, first remove / disconnect one of complete assemblies and see if the fault messages still show. If they do not, then the problem is within the removed assembly.

You will probably not be that lucky however so then remove the other assembly so that you have no tail lights at all.

Do you still get any of the previous messages?

If not, then reinstall the first removed assembly and look for messages.

If this tip works, let us know, and then I will further expand on isolation of the problem.

 

[BuffaloBob]

Thanks for all the input. I will let you know how it goes.

 

[Tecttum]

I have been getting faults and warning lights all over the place.
I have narrowed it down to when the headlights are turned on, the brake lights don't work.

When the headlights are off, the brake lights work perfectly.

Hi BuffaloBob, Did you figure the cause out? I have the same issue