Yaris 1.0 T-Spirit (2005): tail/brake light puzzle

[MichaelFr]

The left tail light and brake light work individually but both cut out when used together:

- when lights are off, the brake light works

- when lights are on the tail light works.

- when the lights are on AND I apply the brake both cut out.

Any ideas what’s going on and how to fix it? Many thanks.

[FROSTYBALLS]

Topic moved to the Yaris forum

[Jasper.]

Bad earth  ??

[flash22]

poor ground on 1 or both lights, any water ingress into the boot ?

[MikeSh]

Very typical symptoms of a faulty earth to the cluster. Using the indicator may also produce an interesting display 🙂

[Madasafish]

Definitely earthing issues. Yu will find an earthing wire connected to the body near the tail lights. Undo, clean surface of retaining screw/bolt and body and refit

[lani100]

Remove both lights from the car and check for dirt, rust and moisture which there most likely will be.
Check the connections and remove the bulbs+bulbholders

[donkeychomp]

After all this, did she pass?

Alex