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Working principle and wiring diagram of gear selector switch

Tiny
OBIORA
  • MEMBER
  • 2004 TOYOTA CAMRY
  • 4 CYL
  • AUTOMATIC
I want to know the working principle of the gear selector switch, which is usually mounted on the top surface of the gear box which controls the starter motor when in neutral or park position the wire harness, its functions and where it is linked to?
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Thursday, April 14th, 2022 AT 3:37 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

The neutral/park switch is located on the transmission as you know for the starter motor to engage, the switch has to be in park or neutral to complete the electrical circuit. Power from the engine control module is sent to the park/neutral switch, through the starter relay, and then to ground. Once that happens, the starter relay is triggered and power to the starter motor is provided power (12v) to the S terminal (smaller wire) on the starter motor. That functions as another relay which in turn allows the starter to engage.

Take a look through the schematic and let me know if what I described makes sense.

Take care,

Joe

See pics below. Note: The schematic below (starter circuit) was one page. I had to cut it in half to make it readable for you. I did overlap them so you can follow from one to the next.
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Thursday, April 14th, 2022 AT 7:56 PM
Tiny
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Thank you so much, sir. You are straight and simply in your explanation as much as possible only that the diagram looks a bit difficult for me to understand. If there is a more simplified or animated diagram that also will real help.
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Thursday, April 14th, 2022 AT 11:16 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

I'm sorry. That is the only diagram I have. However, I would be happy to answer questions if you have them. It's not a problem whatsoever.

Let me know.

Joe
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Friday, April 15th, 2022 AT 6:47 PM
Tiny
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Thank you, sir, I am okay for now. I dually I appreciate your kindness.
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Saturday, April 16th, 2022 AT 12:23 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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You are very welcome. I'm here if you need something.

Take care of yourself and I wish you and your family a Happy Easter.

Joe
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Saturday, April 16th, 2022 AT 4:45 PM

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