The second switch is a relay. Once you depress the brake pedal it closes the circuit and allow power to flow the starter so that when you push the start button it turns and starts your engine. The contacts in relays after a while will start to ware out or start to pit just like points in the older cars and it could not make contact to close the loop with in the circuit which will result not starting.
I had the same issue. It turned out that the break pedal switch was broken. The engine start push button is connected to a second break pedal switch that senses when you push it. That switch is independent from your main break pedal switch that turns on the brake lights of the car.
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THE BRAKE SENSOR IS BEHIND THE BRAKE PADEL LOOK UNDER THE DASH WHERE YOUR BRAKE PADEL IS AT AND TRY TO PRESS IT WIT UR HAND AND YOU WILL SEE IT AND THATS IT YES YOU CAN REPLACE IT IF EMAIL AT TONYGLENN45@YAHOO OR CALL ME AT 786-261-3552
I had the same problem with my 2007 altima I took it to the dealership and they said it was the switch in the break. They said that when the witch goes out it does not recognize that you are pressing the brake pedal down so the engine will not start. My extended just ran out so I had to pay $130 to get it fixed.
Very interesting post, But I can't help but think there must still be a problem if you have to press the brake pedal really hard. I am not doubting you one bit on what you were told but it seems a bit odd to me.
I can see where a bad brake switch could cause this problem, ( The switch that lets the car know your brake is applied and it is safe to start the car).
Thanks to this forum I just fixed my 07 Altima - Every time I pressed the start button the starter did not turn. I knew it wasn't the battery because if the battery was bad the solenoid clicks when you press the start button.
It turned out one of the two brake switches (the one with the four wires) was causing the problem. I removed the connector and pulled off the back of the switch. I was able to see one of the contacts was corroded. I sanded it down with an emory board till both surfaces were shiny again and reassembled the switch. Works like a charm!!