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Do you mean What does it mean when the brake and battery lights come on in when it is already started? Check your alternator may be its not working well it cause the battery sign comes out.
Alternator has/is going bad.
witch lights
1990 toyota celica when jumper cables are hooked up dash lights turn on but the car won't turn over won't even click
possibly
Bad bulbs can be the cause of your reverse lights not working on your 1999 Toyota Tacoma. A problem with the reverse switch or bad wires can also be the cause of your reverse lights not working.
Bad wiring can cause a short in the radio. Bad battery will not.
Dead cell in the battery or the ignition or lights were left on.
Fuses
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water in the wiring or a low battery
A short circuit.