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L3600GST. IGNITION SAFETY INTERLOCK under shift lever replaced. Shift in neutral, (switch closed) still won't turn over. Ignition clicks but starter won't engage.

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Were you in any recent accidents? Sometime if the car gets hit, the gear selector is out of line so to speak and even though it looks like it's in park ort neutral it's actually in the gear either before or after. Sometimes even two gfears off or more. I had that happen to me with a Dodge Diplomat in 1979. The damned thing looked like it was in Park but it was in Reverse so it wouldn't start. I knew I had to have a new tranny cuz the nice folks that stole it must have beaten the hell outta it by shifting from reverse to drive too fast or whatever one does when one steals a car. Don't know enough to change my own transmission--especially back then so I brought it o AAMCO. If you recall, they're the guys who do nothing but transmissions. Anyways, I explained about the gear selector and the neutral safety switch and that they'd need to put it in a different spot to start it. The fellow said he understood and sure ebnough, the n ext day I get a call that they have to have it loked at by the guys next door ( (regular mechanics) because the car won't start and they don't know why. So, I told them once again about the neutral safety switch, and I finally got my tranny fixed. Jeeze!
Other than that, the only other things it could be (that I can think of) are the battery or the starter.
Good luck!

Posted on Apr 19, 2017

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94 merc grandmarkee wont go into park wont start will start if you wiggle in nutral


Park neutral safety switch could be bad , also the shift interlock safety system .
Shift Interlock System A brake/shifter interlock system consists of the following:
  • ignition switch (11572)
  • brake pedal stoplight switch (13480)
  • brake shift interlock module
  • brake shift interlock solenoid assembly (attached to key interlock assembly)
  • necessary wiring
On floor-shift vehicles, the ignition/shifter interlock cable (3F719):
  • locks the floor shift transaxle range selector lever in the PARK position when the ignition switch is in the LOCK position.
  • requires the floor shift transaxle range selector lever to be in the PARK position to turn the ignition switch to the LOCK position.
Condition Possible Source Action
  • Shift Interlock System Does Not Release or Lock Properly
  • Circuitry open/shorted.
  • Blown fuse.
  • Damaged stoplight switch.
  • Damaged shift lock actuator.
  • GO to Pinpoint Test A .

PINPOINT TEST A: SHIFT INTERLOCK SYSTEM DOES NOT RELEASE OR LOCK PROPERLY A1 CHECK ELECTRON IGN FUSE
  • Check Fuse 5 (5A) located in fuse junction panel.
Is fuse OK?
Yes No GO to A3 . GO to A2 . A2 CHECK FOR SHORT TO GROUND
  • Turn ignition switch OFF.
  • Remove Fuse 5 (5A).
  • Disconnect shift-lock actuator connector C203 located to the right of steering column.
  • Measure resistance of the Circuit 1003 (GY/Y) between the correct terminal of Fuse 5 (5A) and ground.
Is resistance greater than 10,000 ohms?
Yes No REPLACE Fuse 5 (5A). GO to A3 . SERVICE Circuit 1003 (GY/Y) wire between fuse junction panel and shift-lock actuator. A3 CHECK POWER SUPPLY FROM FUSE 5 (5A)
  • Reinstall Fuse 5 (5A).
  • Turn ignition switch to RUN.
  • Measure voltage on Circuit 1003 (GY/Y) wire and ground.
Is voltage greater than 10 volts?
Yes No GO to A4 . SERVICE Circuit 1003 (GY/Y) wire between interior fuse panel and shift-lock actuator. A4 CHECK POWER SUPPLY FROM FUSE 28 (15A)
  • Turn ignition switch OFF.
  • Disconnect connector C2016.
  • Turn ignition switch ON.
  • Measure voltage on Circuit 10 (LG/R) and ground.
Is voltage B+?
Yes No GO to A5 . SERVICE Circuit 10 (LG/R) for open. RESTORE vehicle and RETEST system. A5 CHECK WIRE BETWEEN STOPLIGHT SWITCH AND SHIFT-LOCK ACTUATOR
  • Turn ignition switch OFF.
  • Disconnect shift-lock actuator connector C203.
  • Apply brake pedal.
  • Measure voltage on Circuit 810 (R/LG) wire and ground.
Is voltage greater than 10 volts with brake pedal applied and less than 1 volt with brake pedal released?
Yes No GO to A6 . SERVICE Circuit 810 (R/LG) wire between stoplight switch and shift-lock actuator. A6 CHECK SHIFT-LOCK ACTUATOR GROUND
  • Measure resistance of Circuit 57 (BK) and ground.
Is resistance less than 5 ohms?
Yes No REPLACE shift-lock actuator. SERVICE BK wire.

Mar 30, 2017 | Cars & Trucks

1 Answer

Stuck in park will not shift


Automatic Transmission Shift Lock Control System
The automatic transmission shift lock control is a safety device that prevents an inadvertent shift out of PARK when the ignition is ON. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components:
?€¢
The automatic transmission shift lock control solenoid.


?€¢
The automatic transmission shift lock control switch.


?€¢
The park/neutral position switch.

With the ignition in the ON position, battery positive voltage is supplied to the park/neutral position switch. When the transmission is in the PARK position the contacts in the park/neutral position switch are closed. This allows current to flow through the switch to the automatic transmission shift lock control switch. The circuit continues through the normally-closed switch to the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid is permanently grounded. This energizes the automatic transmission shift lock control solenoid, locking the shift linkage in the PARK position. When the driver presses the brake pedal the contacts in the automatic transmission shift lock control switch open, causing the automatic transmission shift lock control solenoid to release. This allows the shift lever to move from the PARK position.
Park Lock Solenoid
The park lock solenoid is a safety device that prevents an inadvertent shift out of PARK when the key is in the OFF position. The key must be in the RUN position to release the park lock solenoid. The system consists of the park lock solenoid. With the ignition in the ON position, voltage is supplied to the park lock solenoid. The park lock solenoid energizes through a permanent ground unlocking the shift lever. With the ignition in the OFF or ACCY position the park lock solenoid de-energizes and locks the shift lever in the park position.
Shift Lever Does Not Move with Brake Pedal Depressed
DEFINITION: Transmission shift lever will not move out of the PARK position with the ignition ON and the brake pedal pressed.

1

Did you perform the Symptoms - Automatic Transmission Shift Lock Control tests and all the necessary inspection?
Go to Step 2
Go to Symptoms - Automatic Transmission Shift Lock Control

2

  1. Turn ON the ignition, with the engine OFF.
  2. Press and hold the brake pedal.
  3. Attempt to move the shift lever out of the PARK position.
Does the shift lever move out of the PARK position?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the automatic transmission shift lock control switch.
  3. Turn ON the ignition, with the engine OFF.
  4. Press and hold the brake pedal.
  5. Attempt to move the transmission shift lever out of the PARK position.
Does the transmission shift lever move out of the PARK position?
Go to Step 6
Go to Step 4

4

  1. Turn OFF the ignition.
  2. Disconnect the automatic transmission shift lock control solenoid.
  3. Turn ON the ignition, with the engine OFF
  4. Press and hold the brake pedal.
  5. Attempt to move the transmission shift lever out of the PARK position.
Does the transmission shift lever move out of the PARK position?
Go to Step 7
Go to Step 5
Inspect for poor connections at the harness connector of the automatic transmission shift lock control solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 10
Go to Step 9

6

Inspect for poor connections at the harness connector of the automatic transmission shift lock control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 10
Go to Step 8

7

Repair the short to battery positive voltage in the A/T shift lock control solenoid supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 10
--

8

Replace the automatic transmission shift lock control switch. Refer to Stop Lamp Switch Replacement in Lighting Systems.
Did you complete the replacement?

Oct 13, 2015 | 2006 Hummer H2

1 Answer

The linkage are hooked up but the car still want go into park,a 2000 Taurus


Do you have floor console shifter ?
Shift Interlock System A brake/shifter interlock system consists of the following:
  • ignition switch (11572)
  • brake pedal stoplight switch (13480)
  • brake shift interlock module
  • brake shift interlock solenoid assembly (attached to key interlock assembly)
  • necessary wiring
On floor-shift vehicles, the ignition/shifter interlock cable (3F719):
  • locks the floor shift transaxle range selector lever in the PARK position when the ignition switch is in the LOCK position.
  • requires the floor shift transaxle range selector lever to be in the PARK position to turn the ignition switch to the LOCK position.

May 04, 2015 | 2000 Ford Taurus

2 Answers

Where is the neutral saftey switch on an 2004 chevy cavalier


It should start in neutral position. Neutral safety switch is usually located under the shift console by the shift lever.

Mar 27, 2013 | 2004 Chevrolet Cavalier

1 Answer

My 2001 Jeep Grand Cherokee wont start sometimes, but if I put it in neutral then try to start it..It starts .. What is the problem with my baby.......


Test/Service/Replace

The circuit on newer cars with automatic transmissions has a neutral safety, or neutral start switch installed between the ignition switch and the starter. The ignition switch cannot operate the starter motor unless the transmission is in park or neutral.
Late model vehicles with manual transmissions have a starter/clutch interlock switch that requires the clutch to be depressed to the floor.
Neutral Safety Switch
Normal operations of a neutral safety switch provides a quick check for the adjustment of the gear selector linkage.
  • To do this, move the selector slowly until it clicks into the PARK position.
  • Turn the ignition key to the START position.
  • If the starter operates, the PARK position is correct.
  • After checking the PARK position, move the lever slowly toward the NEUTRAL position until the lever drops at the end of the NEUTRAL stop in the selector gate.
  • If the starter also operates at this point, the gearshift linkage is properly adjusted.
  • This quick test also tests the adjustment of the neutral safety switch.
  • If the engine does not start in either or both of these positions, the neutral safety switch or the gear selector linkage needs adjustment or repair.

CAUTION
Since you must work under the vehicle to adjust most shift linkages make sure you properly raise and support the vehicle before working under it. Also, wear safety glasses or goggles while working under the vehicle.
A voltmeter can be used to check the switch for voltage when the ignition key is turned to the START position with the shift lever in PARK or NEUTRAL. If there is no voltage, the switch should be adjusted or replaced.

Jan 26, 2013 | 2002 Jeep Grand Cherokee

1 Answer

What problems will I hav wit a bad ignition switch on my ford 500


Several, like failing to activate the starter or failing to shut off the Ignition completely when the engine is off. Just depends on which terminal is the worst.

Now there is an Interlock switch which links the shift cable, Ignition switch and brakes for safety. Sometimes this switch, the Interlock, will make it impossible to use the starter when the Ignition key is turned to the start position.

The Interlock switch is located on the brake pedal lever under the dash. It often gets dislodged or broken by the Drivers' feet. Depending on your symptoms, the Interlock switch could well be the cause of your problems.

Please rate my info.

Jan 05, 2013 | Cars & Trucks

1 Answer

My car wouldn't start, we replaced the starter, the ignition, the crank relay, and it still won't start. we are trying to locate the neutral relay switch, can you help


The neutral safety switch,or range sensor is mounted on the transmission at the shift linkage area.replacing it will require theshift lever to be removed

Sep 06, 2011 | 2000 Chevrolet Impala

1 Answer

My Taurus wont start. The lights and radio have full strength. I also have a 3 month old battery. When i turn the key there is no sound at all. Could this be a relay switch problem.


It can be several things. Check under the dash at the top of the Brake pedal lever. There are some contact switches which can get hit by a foot and broken or dislodged.

There is a shift Interlock switch which is in the console and there are hidden screws so watch for them before prying. Or you can try to shift into Neutral and see if the starter will engage.

A third way is to turn the Key from off to the first position where you can remove the Key from the Ignition switch, then move the gearshift into Neutral and start your car. When it is running you can then shift into Drive or Reverse. This is an emergency bypass sequence. You still need to have the safety Interlocks realigned or replaced.

Your Starter Relay could be bad. If you have a testlight or Voltmeter, take the small wire on the relay off the terminal and connect the test equipment. If the small wire has power when you turn the Key to Start the Relay is bad because it did not work when the wire was connected. If the wire does not have power, its an Interlock problem or a fuse.

The fuses for your system are under the hood. Location 217 has a 15 Amp and location 232 has a 10 Amp fuse. They are tied into the ignition.

I hope my solutions will get you going.

Dec 24, 2010 | 2005 Ford Taurus

1 Answer

Auto Ignition Starting Proble


check neutral safety switch...usually mounted on gear selector...also check shift linkage for correct adjustment

Dec 13, 2009 | 1995 Geo Prizm

2 Answers

My shifter wont come out of park


It's likely the safety switch. There's a switch on the arm above the brake pedal that is closed when you push the brake down. This allows the transmission interlock to disengage so you can shift out of park. If the switch is bad (or misaligned), you won't be able to shift out of park. If you lay on the floor and look up the arm that holds the brake pedal, you'll likely see it. Make sure that when you press the pedal, it's closing the switch. If it's out of alignment, you should be able to loosen the nut and move it so it works. If it's aligned and the wires aren't damaged, then the switch has gone bad and will need to be replaced.

Nov 10, 2009 | 2005 Chrysler 300

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