Question about 2000 Lexus RX 300

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When brake is applied both turn signal light up on the dashboard and on the outside lights. What would cause this to happen?

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The bulbs may be installed incorrectly or partially burned, it could be a loose ground wire on the brake lights, or perhaps a short in the dash. I would start with the bulbs though. hope this helps.

Posted on May 21, 2011

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The high mount brake light gets its own signal from the brake light switch (on the brake pedal). Or at least the wire leaving the brake light switch will splice, one wire to the high mount brake light, and the other for the rear brake lights is routed through the turn signal switch, and coordinated there with the turn signal wires to the rear brake lights. The brake wires and turn signal wires share the same wire, and same filament in the bulbs. It is kind of complicated, but brakes applied with no turn signal, brake light wire goes from brake light switch through the turn switch and out to the bulbs. If brakes applied with turning signal, non blinking brake light wire goes from turn switch to rear light, while the turning signal wire will go through the flasher relay, and then to the rear light to cause blinking.

I hope that makes sense. It appears the problem may be in the turn signal switch for both the turn signals and the rear brake lights.

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It sounds as if you have a bad earth to either one or both of your rear light clusters. If it only happens when you indicate in one direction then that is the offending side.

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traction system warning message.The right turn signal also blinks rapidly if turned on,both dashboard turn signal lights also on come together venture 2001.This happens when it is cold raining and the automatic head lights are on and the brake pedal is depressed.

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one of the lights has a ground fault, likely the ground wire is broken or badly corroded. so it could be either light on the affected side, check both front and rear light sockets for a ground wire or strap.(usually a black or green wire)

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Hi,

Usually when this kind of thing happens it will be a bad earth, that means that somewhere within the lighting circuit the earth cable has broken down. Try and locate the earth cable that connects the rear bulbs, see if any rust or damage is visible.
If not you could try adding a seperate earth cable to a clean point close to the bulb holder in the rear.

If this fails to work then it may be an idea to talk with an auto electrician.

Good luck.

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