How to remove and replace Park/Neutral Switch

Park/Neutral Position Switch Replacement

Removal Procedure

1. Apply the parking brake.
2. Block the wheels.
3. Place the vehicle is the Neutral position.
4. Remove the throttle body air inlet duct. Refer to Air Cleaner Assembly Replacement in Engine Controls.


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5. Remove the automatic transaxle range selector cable.


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6. Remove the wiring harness connectors.
7. Remove the automatic transaxle range selector lever. Refer to Automatic Transmission Range Selector Cable Lever Replacement .


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8. Remove the PNP switch mounting bolts.
9. Remove the PNP switch.

Installation Procedure

Tool RequiredJ 41545 Park/Neutral Switch Alignment Tool

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1. Verify that the shift shaft in the Neutral position.
ImportantDO NOT ROTATE A NEW PNP SWITCH. A new PNP switch is pinned in the Neutral position. If the bolt holes do not align with the mounting boss on the transaxle, verify that the shaft is in the Neutral position.
Adjust the PNP switch if the new switch has been rotated and the pin is broken or if using an old PNP switch. Refer to Park/Neutral Position Switch Adjustment .
2. Align the flats of the shift shaft to the flats in the PNP switch.
3. Install the PNP switch to the mounting boss.
Caution! Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

4. Install the PNP switch mounting bolts.
Tighten
Tighten the PNP switch mounting bolts to 25 N·m (18 lb ft).

5. Install the automatic transaxle range selector lever. Refer to Automatic Transmission Range Selector Cable Lever Replacement .


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6. Install the wiring harness connectors.


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7. Install the automatic transaxle range selector cable.
ImportantVerify that the engine starts only in the Park position or the Neutral position once the PNP switch is installed. Readjust the PNP switch and/or check the shifter and the automatic transaxle range selector lever if the engine starts in any other position. Refer to Park/Neutral Position Switch Adjustment and/or Automatic Transmission Range Selector Lever Cable Adjustment .

8. Install the throttle body air inlet duct. Refer to Air Cleaner Assembly Replacement in Engine Controls.
9. Remove the blocks from the wheels.
10. Disengage the parking brake. Hope this helps, the page was read only so no pictures. Info is for 3.1L engine.

Neutral Safety Switch

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REMOVAL & INSTALLATION

The back-up light switch is incorporated into the neutral/park safety switch. The neutral safety switch on 1988-94 models is mounted in the steering column.

P0705 - Transmission Range Sensor Malfunction. The park/neutral position (PNP) switch includes a transmission range switch. The transmission range switch detects the selector lever position when the shift lever is in the N or P shift position and sends a signal to the Transmission Control Module (TCM). The possible causes of this are the following: Open or short park/neutral position switch circuit. Poor park/neutral position switch circuit connection. Misadjusted park/neutral position switch. Park/neutral position switch may be faulty. Inspect the pnp switch and replace if needed.

It could be a bad ignition switch or bad starter wire from the starter switch, or the PNP is not adjusted correctly:

Here are instructions on how to remove and replace the PNP, but read over it to understand how to adjust:
Park/Neutral Safety Switch REMOVAL AND INSTALLATION ES300 1993-94 Models

1. With the ignition switch in the LOCK position, disconnect the negative battery terminal. If equipped with an air bag system, wait at least 90 seconds or longer before performing any other work.
2. Raise and safely support the vehicle.
3. Disconnect the Park/Neutral switch connector.
4. Remove the clip from the shift control cable.
5. Remove the nut and control cable.
6. Remove the bolts and pull out the Park/Neutral switch. To install:
   
7. Install the Park/Neutral switch and loosely install the bolts.
8. Adjust the switch and torque the bolts to 48 inch lbs. (5 Nm).
9. Install the control shaft lever.
10. Install the control shaft cable and torque the nut to 9 ft. lbs. (13 Nm). Fig. 1: The transaxle control shaft lever has a nut and washer to retain it - 1993-94 ES300
    Fig. 2: Removing the Park/Neutral switch - 1993-94 ES300
    
    
11. Install the clip to the shift control cable.
12. Lower the vehicle.
13. Connect the negative battery cable.
14. Make sure the vehicle will start only in the PARK or NEUTRAL position.

1995-97 Models Fig. 3: Aligning the neutral base line and groove - 1995-97 ES300
Fig. 4: Park/Neutral switch removal and installation - GS300, LS400, SC300 and SC400
Fig. 5: Park/Neutral switch adjustment - GS300, LS400, SC300 and SC400

1. With the ignition switch OFF, disconnect the battery cables, negative terminal first. Allow 90 seconds to elapse before performing any other work.
2. Apply the parking brake fully and block the rear wheels.
3. Disconnect the electrical connector from the Park/Neutral position switch.
4. Remove the locknut and disconnect the control cable from the manual shift lever.
5. Remove the clip from the holding the control cable to the bracket.
6. Remove the nut, washer and the manual shift lever from the manual valve shaft.
7. Using a flat bladed tool, bend the lock washer back away from the nut.
8. Remove the nut and lock washer from the Park/Neutral switch.
9. Remove the two bolts and the Park/Neutral position switch. To install:
   
10. Install the Park/Neutral position switch to the manual valve shaft. Leave the two bolts loose at this time.
11. Install the lock washer and nut. Torque the nut to 61 inch lbs. (7 Nm).
12. Using a flat bladed tool, bend the lock washer over the nut to secure the nut in place.
13. Adjust the Park/Neutral as follows:
    1. Install the manual shift lever to the Park/Neutral switch and set the shift lever to the neutral ( N) position.
    2. Align the groove and the neutral basic line on the Park/Neutral switch.
    3. Hold the Park/Neutral switch in this position and tighten the two bolts to 48 inch lbs. (5 Nm).
14. Install the manual shift lever with washer and nut.
15. Install the control cable to the manual shift lever and install the nut. Torque the nut to 11 ft. lbs. (15 Nm).
16. Install the control cable to the bracket by installing the clip.
17. Connect the electrical connector to the Park/Neutral switch.
18. Lower the vehicle and check the vehicles shifting positions.
19. Connect the negative battery cable to the battery.
20. Verify that the vehicle only starts in PARK or NEUTRAL.

GS300, LS400, SC300 and SC400

1. With the ignition switch OFF, disconnect the battery cables, negative terminal first. Allow 90 seconds to elapse before performing any other work.
2. Raise and safely support the vehicle.
3. If necessary, remove the front exhaust pipe.
4. Disconnect the neutral start switch connector.
5. Remove the control shaft shift lever.
6. Pry off the washer and remove the nut.
7. Remove the bolt and pull out the neutral start switch. To install:
   
8. Install the Park/Neutral switch and loosely install the bolt.
9. Adjust the switch as follows:
   1. Loosen the neutral start switch bolt and place the shift lever in the N position.
   2. Align the groove and the neutral basic line.
   3. Hold in position and tighten the bolt to 9 ft. lbs. (13 Nm).
10. Install the nut and washer.
11. Install the control shaft shift lever.
12. Connect the electrical connector.
13. Install the front exhaust pipe. Torque the front nuts to 46 ft. lbs. (62 Nm). Torque the pipe support bracket to bolts to 32 ft. lbs. (43 Nm). Torque the No. 2 front exhaust pipe to the front exhaust pipe bolts to 32 ft. lbs. (43 Nm).
14. Lower the vehicle.
15. Connect the negative battery cable to the battery.
16. Verify that the vehicle will only start in the N or P positions.

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Maybe try to press the brake pedal and run the gear shift throughout the full range of gears while the car is on level ground, and retry the starter to see if there is a faulty PNP adjustment.

Try to start in Neutral not Park, and jiggle the gear shift back and forth to see if the PNP is not adjusted right.

Good luck on this repair.

check 15 amp fuse (may be in engine compartment relay box). If fuse is good, check switch on transmission. To check the switch, pull the connector off and short the two outer terminals together. With the key on, the backup light should come on. If they do, replace the switch. The switch looks something like this:


The neutral safety switch, otherwise known as the park/neutral position switch, prevents the vehicle from being started in any position other than PARK and NEUTRAL. It also functions as the back-up lamp switch.
The neutral safely switch is threaded into the transmission case. When the gearshift lever is placed in either the PARK or NEUTRAL position, a cam, which is attached to the transmission throttle lever inside the transmission, contacts the neutral safety switch and provides a ground to complete the starter solenoid circuit. The back-up light switch is incorporated into the neutral safety switch.
The center terminal is for the neutral safety switch and the two outer terminals are for the back-up lights.
There is no adjustment for the switch. If a malfunction occurs, the switch must be removed and replaced.

Your safety interlock switch is going out or is not adjusted properly. There is a procedure for adjusting the switch. The switch is on the transmission in the engine compartment. If you want to adjust the switch, loosen the botls holding the switch and follow steps 7-8 below. Else, you can just replace the switch entirely by following all steps.

The neutral start and backup switch are one unit mounted on the top left end of the transaxle. The neutral start portion of the switch allows electrical current to travel to the ignition system when the shift selector is in park or neutral only. The vehicle will not start when the selector is in any other gear. The backup portion operates the rear backup lamps when selector is in the reverse gear.

REMOVAL & INSTALLATION See Figures 1 and 2

1. Make sure the shift selector in the Park position, then apply the emergency brake.
2. Disconnect the negative battery cable.
3. Disengage the neutral start switch electrical connector, then remove the shift control lever on top of the switch.
4. Remove the two neutral switch attaching bolts, then remove the switch.

Fig. Fig. 1: Neutral safety switch location-vehicles equipped with automatic transaxle

Fig. Fig. 2: Adjusting the neutral safety switch

To install:

1. Install the switch on the manual shaft.
2. Loosely install the two attaching bolts and washers.
3. Insert a No. 43 drill (0.089 in.) through the hole.
4. Tighten the attaching bolts to 7-9 ft. lbs. (9-12 Nm), then remove the drill.
5. Engage the switch electrical connector, then connect the negative battery cable.

The park/neutral position switch prevents the car from being started when the transmission is in any gear other than Park or Neutral.. When the transmission is in Reverse (with the engine running), the switch completes the back-up light circuit, illuminating the back-up lights.



Fig. 1: After removing the console, you can access the park/neutral position switch.

Hope help with this (remember rated this post).

Use like reference guide for GM Cadillac 1967-1989 Repair Guide Neutral Safety Switch - REMOVAL & INSTALLATION

All Except 1985-89 Eldorado and Seville
See Figure 1
The neutral safety switch prevents the engine from being started in any transmission position except Neutral or Park. The switch is located on the upper side of the steering column under the instrument panel on column shift cars, and inside the shift console on floor shift models.

1. Remove the console for access on floor shift models.
2. Disconnect the electrical connectors.
3. Remove the neutral switch.

To install:

1. Place 1967-70 column shift lever models in Drive, and 1971 and later models in neutral. Locate the lever tang against the transmission selector plate on column shift models.
2. Align the slot in the contact support with the hole in the switch. Insert a 3 / 32 in. (2.38mm) diameter pin in place. The switch is now aligned in Drive position.

1973 and later neutral safety switches have a shear-pin installed to aid in proper switch alignment so that insertion of a pin is unnecessary. Moving the shift lever from Neutral shears the pin.

1. Place the contact support drive slot over the drive tang. Install the switch mounting screws.
2. Remove the aligning pin. Connect the electrical wiring, and replace the console.
3. Set the parking brake and hold your foot on the service brake pedal. Check to see that the engine will start only in Park or Neutral.

Fig. 1: Installation of a common neutral safety switch



ADJUSTMENT
See Figure 2
1974 and later cars do not have a neutral safety switch. Instead, these cars have an interlock between the lock and the transmission selector, which is non-adjustable.

1. Place the shift lever in Neutral.
2. Move the switch until you can insert a gauge pin, 3 / 32 in. (2.38mm) diameter, into the hole in the switch and through to the alignment hole.
3. Loosen the switch securing screws. Remove the console first, if necessary.
4. Tighten the screws and remove the pin.
5. Step on the brake pedal and check to see that the engine will only start in Neutral or Park.
   

Fig. 2: Adjustment of a common neutral safety switch


1985-89 Eldorado and Seville
See Figure 3

All neutral safety/back-up light switches come with a small plastic alignment pin installed. Leave this pin in place.

1. Place the shifter assembly in the Neutral position.
2. Remove the shifter lever-to-switch nut and the lever.
3. Disconnect the electrical connector from the neutral safety/back-up light switch.
4. Remove the neutral safety/back-up light switch-to-transaxle bolts and the switch from the vehicle.

To install:

1. Position the shifter shaft in the Neutral position.

If using an old switch or the plastic pin (new switch) is broken, install a3/32in. (2.38mm) diameter pin gauge (drill bit) into the neutral safety/back-up light switch; the switch is then locked into its Neutral position.

1. Align the flats of the shifter shaft and the neutral safety/back-up light, then, align the switch-to-tang on the transaxle. Torque the switch-to-transaxle bolts to 22 ft. lbs. (30 Nm). Remove the pin gauge.
2. To complete installation, reverse the removal procedures. Make sure that the engine starts only in the Park and Neutral positions.
   

Fig. 3: Neutral start and back-up lamp switch - 1985-89 Eldorado and Seville

Hope help with this (remember rated and comment this). Good luck.

improper park\neutral switch adjustment,

Check
1 The Park/Neutral/Back-up light switch
has a black colored insulator and is located
at the lower left hand side of the transaxle
near the oil pan. The switch inhibits starter
motor engagement unless the gearshift lever
is in the PARK or NEUTRAL position and
completes the back-up light circuit when the
gearshift lever is placed in REVERSE.
2 Prior to checking the switch, first make
sure the shift cable is adjusted properly (see
Section 4).
3 Raise the vehicle and support it securely
on jackstands. Extract the 2 push-in fasteners
and remove the transaxle splash shield.
4 Disconnect the electrical connector
from the Park/Neutral/Back-up light switch.
5 Using an ohmmeter, check for continuity
between the center terminal of the switch and
the switch body. Continuity should only be
present with the gearshift lever in PARK and
NEUTRAL. If continuity is detected with the
gearshift lever in any other position, replace
the switch.
6 Next, check for continuity between the
t wo outer terminals. Continuity should only
exist with the gearshift lever in the Reverse
position. Check the for continuity between
each of the outer terminals and the switch
body. No continuity should be present.
Replace the switch if it fails any of these
checks.
7 Install the transaxle splash shield and
secure it with the 2 push-in fasteners. Lower
the vehicle.
Replacement
Refer to illustration 6.10
8 Raise the vehicle and support it securely
on jackstands. Extract the 2 push-in fasteners
and remove the transaxle splash shield.
9 Working under the vehicle, disconnect
the electrical connector from the switch.
Place a drain container under the transaxle as
some fluid loss will occur.
10 Unscrew the switch from the transaxle
using a box-end wrench (see illustration).
Discard the switch seal.
11 Look into the switch opening in the
transaxle. Have an assistant shift the
transaxle from PARK to NEUTRAL. Check
that the internal operating fingers are centered
in the switch opening.
12 Install the new switch and seal into the
transaxle and tighten the switch to the torque
li sted in this Chapter's Specification Section.
13 Recheck the switch operation (see
Steps 1 through 6).
14 Attach the switch electrical connector,
install the transaxle splash shield and lower
the vehicle.
15 Check the transaxle fluid level and add
more, if necessary (see Chapter 1).

The neutral safety switch is on the top of the automatic transaxle (under the hood). You have to remove the air cleaner assembly for access to this item. Once the air cleaner is off, you can see the switch mounted on top of the transaxle.
Remove the shift linkage, electrical connectors and vacuum hose as needed.
Remove fuel line bracket if needed.
Remove mounting bolts and nuts to remove the old switch.

Install new switch as reverse of above.
Put shift lever in neutral.
Align switch so it's alignment hole and the matching tang hole line up. Tighten down the switch mounting bolts. Verify that the engine starts in PARK and NEUTRAL. Re-adjust if it doesn't.
Charlie