Rear light out indicator

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Mar 5, 2019 | 07:01 AM

TrueGS300

Thread Starter

Pole Position

Joined: Nov 2018

Posts: 2,072

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From: CA

Rear light out indicator

Is it common for the lamp outage module/sensor to go bad? The only light on the dash I'm having a problem with it is the rear light icon. It only comes on when I hit the brakes and stays on the until the vehicle is turned off. (So as soon as you touch the brakes to shift into drive or reverse.) I have replaced every bulb. They all were working, and all are still working. I can get a used module on ebay for around $50.

Mar 5, 2019 | 10:03 AM

JAB

Instructor

Joined: Jan 2006

Posts: 1,016

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From: Virginia

I suggest replacing the center brake light socket and see if that doesn't cure the problem. I had your problem; replacing the socket cured it.

Mar 5, 2019 | 10:30 AM

salimshah

CL Community Team

Joined: Apr 2001

Posts: 16,533

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From: Austin, TX

There are 2 bulbs on each side pillar and 1 on the top edge of the hatch (3rd brake light).

Have a helper verify all the 5 are lighting up with the proper intensity. Also if any bulb was replaced, it must draw the same current as the original bulb [led or other types can draw less current triggering the brake warning light].

Salim

Mar 5, 2019 | 05:53 PM

TrueGS300

Thread Starter

Pole Position

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From: CA

I have the car down at my shop. We verified they are all working, and I did replace all bulbs and messed with the 3rd light socket. I replaced the bulbs with what came out though.

Anyone know the OEM bulbs for the rear lights?

Mar 5, 2019 | 05:59 PM

TrueGS300

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Pole Position

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From: CA

Also is there any way the brake switch at the peddle could have anything to do with it or is that outside of the modules scope?

Mar 5, 2019 | 06:34 PM

salimshah

CL Community Team

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From: Austin, TX

Quote:

Originally Posted by TrueGS300

Also is there any way the brake switch at the peddle could have anything to do with it or is that outside of the modules scope?

If the brake pedal switch was bad, you would not be able to shift the vehicle out of park.

Salim

Mar 5, 2019 | 07:56 PM

Nad1370

Lexus Test Driver

Joined: Apr 2008

Posts: 1,058

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From: Illinois

Light failure lamp sensor usually dont go out on these.
Make sure you have the correct bulbs and wattage.
3rd brake bulb is the most often culprit.
Even if it lights up, with the wrong bulb, it will trip the failure lamp.

Bulbs:
Brake/ Taillight -- 7443 bulb ( 21 watts brake, 5 watts taillight)
3rd brake (high mount) -- 921 bulb 18 watts

Try using these bulbs first and make sure its securely in the socket.