Working principle and wiring diagram of gear selector switch

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?

5 Replies

JACOBANDNICKOLAS

MECHANIC
108,465 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.

Images (Click to make bigger)

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Thursday, April 14th, 2022 AT 7:56 PM

OBIORA

MEMBER
10 POSTS

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

JACOBANDNICKOLAS

MECHANIC
108,465 POSTS

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

OBIORA