The brake wear indicator is a small metal stone-like sensor that attaches to the brake pad. Once the pad wears down to a certain level, it begins wearing into the sensor, breaking the circuit open.
Once the light has come on, the appropriate sensor (front or rear) must be replaced to return functionality. Factory brake pads usually come with new sensors. Aftermarkets do not, and often have no provisions for attaching them either.
Alternately, you can bypass the brake level sensors by splicing the two wires for the sensor together. You will no longer have brake level warnings if you do this however.
The backlighting on a few of the convenience buttons on the center instrument panel have gone out on...
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The backlighting on a few of the convenience buttons on the center instrument panel have gone out on my 1999 Lexus 400 LS. The light for the seat heating button and the driver side temperature display are not coming on. Can't find any info in the owners manual or in the Lexus Forums. Can you advise?