What is the function of the Neutral Safety Switch and how is it adjusted on Lexus ES300?

The Park/Neutral position switch which does not allow the engine to crank in any gear other than Park or Neutral; and if it starts in any other position, the switch needs to be adjusted. This switch also functions as an information sensor for the (ECT Electronic Controlled Transaxle) Electronic Control Unit as it gives electrical input in the form of a voltage signal when the shift lever is in place. To test the switch, lift the front of the vehicle and support it with jackstands disconnected the electrical connector and with an ohmmeter test for continuity between the referenced terminals for each switch position. If the continuity is not as what is specified, then it is advisable to replace the switch. For replacement, raise the front of the, vehicle again, disconnect the electrical connector, remove the manual lever retaining nut, take off the manual lever, remove the switch retaining bolts to delete the switch. It is done in the reverse order that was applied during removal so that the switch is set as desired. For adjustment, the switch retaining bolts need to be loosened, the switch rotated until the groove and neutral basic line is in position then tightening the bolts to hold the switch in position.

Genuine Lexus ES300 Neutral Safety Switch

Transmission Neutral Safety Switch

Select Vehicle by Model
Select Vehicle by VIN

Select Vehicle by Model

Make

Model

Year

Select Vehicle by VIN

For the most accurate results, select vehicle by your VIN (Vehicle Identification Number).

6 Neutral Safety Switches found

View related parts
Lexus ES300 Switch Assy, Neutral Start
Part Number: 84540-12200
$169.32 MSRP: $230.86
You Save: $61.54 (27%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Neutral Safety Switch
- Manufacturer Note: TOKAIRIKA
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1998-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
View related parts
Lexus ES300 Switch Assy, Neutral Start
Part Number: 84540-12230
$151.28 MSRP: $204.57
You Save: $53.29 (27%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaced by: 84540-06010
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2002-2003 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV30L-BEAGKA
View related parts
Lexus ES300 Switch Assy, Neutral Start
Part Number: 84540-20200
$169.32 MSRP: $230.86
You Save: $61.54 (27%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Neutral Safety Switch
- Manufacturer Note: BRAZIL SPEC
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1993-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV10L-BTPGKA, MCV10L-BTPGKK, MCV20L-BTPGKA, MCV20L-BTPGKK
View related parts
Lexus ES300 Switch Assy, Neutral Start
Part Number: 84540-12210
$169.32 MSRP: $230.86
You Save: $61.54 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Neutral Safety Switch
- Manufacturer Note: MATSUSHITA
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1998-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
View related parts
Lexus ES300 Switch Assy, Neutral Start
Part Number: 84540-48010
$151.28 MSRP: $204.57
You Save: $53.29 (27%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaced by: 84540-0E010
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2003 Lexus ES300 | 6 Cyl 3.3L | 3MZFE; MCV31L-BEAGKA
View related parts
Lexus ES300 Switch Assy, Neutral Start
Part Number: 84540-32090
Product Specifications
- Other Name: Neutral Safety Switch
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1992-1994 Lexus ES300 | 6 Cyl 3.0L | 3VZFE; VCV10L-BTPGKA, VCV10L-BTPGKK

Lexus ES300 Neutral Safety Switch

The Lexus ES300 Neutral Safety Switch is the built-in safety gatekeeper that allows the sedan to fire up only when the gear selector is in the park or neutral position and prevents any surprise lurch during startup. Acting like an electronic referee, this Neutral Safety Switch monitors the transmission position circuit and if it detects anything other than the specified park or neutral positions, it interrupts the starter signal so that the engine remains quiet. Because the entire ES300 line uses automatic gear selection, which is essential for the everyday comfort of the vehicle, the switch becomes a simple but vital link between the ignition key and transmission. Information from the source does not indicate multiple designs over production years, but drivers can assume that one essential style has been carried over the ES300 timeline and is always dedicated to the same protective mission. Whether the car rolled off the line in the early nineties or in a later build, the Neutral Safety Switch holds the same logic where it blocks current flow when the shifter is in the drive or reverse position and allows current flow when the shifter is in the safe position. In any Lexus service guide, the Neutral Safety Switch is called out as a first stop during no-start diagnostics, which is a tip many Lexus owners like when troubleshooting. Regular attention to the cleanliness of the wiring keeps the Lexus electronics responsive, allowing the Neutral Safety Switch to continue guarding every ES300 ignition sequence.

Should you need to purchase new auto parts for your vehicle, we strongly suggest you consider the genuine Lexus ES300 Neutral Safety Switch available on LexusPartsNow.com. Our OEM Lexus ES300 Neutral Safety Switch come with the reassurance of the manufacturer's warranty, a hassle-free return policy, and speedy delivery service, all at affordable prices online. Feel free to shop with confidence!

Lexus ES300 Neutral Safety Switch Parts Questions & Experts Answers

Switch Assy, Neutral Start
84540-20200
Q: What is the function of the Neutral Safety Switch and how is it adjusted on Lexus ES300?
A:
The Park/Neutral position switch which does not allow the engine to crank in any gear other than Park or Neutral; and if it starts in any other position, the switch needs to be adjusted. This switch also functions as an information sensor for the (ECT Electronic Controlled Transaxle) Electronic Control Unit as it gives electrical input in the form of a voltage signal when the shift lever is in place. To test the switch, lift the front of the vehicle and support it with jackstands disconnected the electrical connector and with an ohmmeter test for continuity between the referenced terminals for each switch position. If the continuity is not as what is specified, then it is advisable to replace the switch. For replacement, raise the front of the, vehicle again, disconnect the electrical connector, remove the manual lever retaining nut, take off the manual lever, remove the switch retaining bolts to delete the switch. It is done in the reverse order that was applied during removal so that the switch is set as desired. For adjustment, the switch retaining bolts need to be loosened, the switch rotated until the groove and neutral basic line is in position then tightening the bolts to hold the switch in position.