Interlock actuator How check and change

More then likely a problem with the shift interlock system . Stepping on the brake pedal , do the brake light's light up ? The shift interlock system is a safety system that won't allow the gear selector to be moved out of park unless driver is pushing the brake pedal . Part's involved - brake switch , inlock solenoid , wiring etc.... May also have electronic module involved , BCM - body control module .
Do you have floor or column shifter ?

Shift Interlock System
The shift interlock system consists of:

• a shift lock actuator .
  • A transmission shift lock actuator, which clips to the actuator retainer, securing the shift lock actuator to the steering column.
  • A transmission shift lock actuator cable which routes to the floor console mounted shifter assembly lock mechanism.
• electrical circuits to supply power to lock and unlock the shift lock actuator.

The shift lock mechanism locks the gearshift lever in PARK:

• when the ignition switch lock cylinder is in the LOCK position.
• with the ignition switch lock cylinder in the RUN position and the brake pedal released.

The shift lock actuator releases the gearshift lever:

• when the ignition switch lock cylinder is in the FIRST position.
• with the ignition switch lock cylinder in the RUN position and the brake pedal actuated.

Safety system - shift interlock . Won't let driver move gear selector unless foot is pushing on the brake pedal . part's involved (FEM) front electronic module , brake switch .
Shift Interlock System
The shift interlock system consists of:

• a shift lock actuator .
  • A transmission shift lock actuator, which clips to the actuator retainer, securing the shift lock actuator to the steering column.
  • A transmission shift lock actuator cable which routes to the floor console mounted shifter assembly lock mechanism.
• electrical circuits to supply power to lock and unlock the shift lock actuator.

The shift lock mechanism locks the gearshift lever in PARK:

• when the ignition switch lock cylinder is in the LOCK position.
• with the ignition switch lock cylinder in the RUN position and the brake pedal released.

The shift lock actuator releases the gearshift lever:

• when the ignition switch lock cylinder is in the FIRST position.
• with the ignition switch lock cylinder in the RUN position and the brake pedal actuated.
• '
• does your car have column or floor console shifter ?
• SYMPTOM CHART Condition Possible Sources Action
  • The shift interlock system does not release/lock correctly
  • Circuit(s).
  • Fuse(s).
  • Shift lock actuator.
  • Brake pedal position (BPP) switch.
  • Go To Pinpoint Test A .
• your best bet maybe to take your vehicle to a qualified repair shop., unless you know how to diagnosed automotive electrical circuit's , viewing wiring diagrams an testing with a DVOM - digital volt ohm meter . Do you know what an automotive electrical wiring diagram is ?

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.

Most likely a problem with the
Shift Interlock System
The shift interlock system prevents the shifting from PARK unless the brake pedal (2455) is depressed. The shift interlock system consists of a shift lock actuator (3Z719) mounted at the base of the steering column tube (3514). If the ignition switch (11572) is in the RUN position, the shift lock actuator is continually on unless the brake pedal is depressed.
Could have a bad brake switch , do the brake lights work ?
Inspection and Verification

1. Verify the customer concern by operating the transmission external control.

1. Visually inspect for obvious signs of mechanical and electrical damage, incorrect component installation, and component misalignment. Verify that all circuit-related systems are functioning correctly. Refer to the following chart:
   
   Visual Inspection Chart Mechanical Electrical
   • Damaged shift lock actuator
   • Damaged brake pedal position switch
   • Damaged steering column
   • Damaged transmission control switch
   • Damaged instrument cluster
   • Damaged shift cable and bracket
   • Failed fuse(s)
   • Damaged wiring harness
   • Loose or corroded connections

1. If the fault is not visually evident, proceed to the Symptom Chart

SYMPTOM CHART Condition Possible Sources Action

• Shift Interlock System Does Not Release/Lock Properly

• Circuit(s).
• Fuse(s).
• Shift lock actuator.
• Brake pedal position (BPP) switch.

• GO to Pinpoint Test A .

PINPOINT TEST A: THE SHIFT INTERLOCK SYSTEM DOES NOT RELEASE/LOCK CORRECTLY CONDITIONS DETAILS/RESULTS/ACTIONS A1 TEST FUSE 10 (7.5A)
Fuse 10 (7.5A)
Measure the resistance of fuse 10.

• Is the resistance 5 ohms or less?

Yes GO to A2 .

No GO to A3 . A2 CHECK THE POWER SUPPLY TO THE SHIFT LOCK ACTUATOR-CIRCUIT 1003 (GY/YE)
Shift Lock Actuator C289
Measure the voltage between the shift lock actuator C289 pin 3, circuit 1003 (GY/YE), harness side and ground.

• Is the voltage greater than 10 volts?

Yes GO to A5 .

No GO to A4 . A3 TEST CIRCUIT 1003 (GY/YE) FOR SHORT TO GROUND
Shift Lock Actuator C289
Measure the resistance at C289 pin 3, circuit 1003 (GY/YE).

• Is the resistance 10 K ohms or less?

Yes REPAIR circuit 1003 (GY/YE) for short to ground. TEST the system for normal operation.

No INSTALL a new shift lock actuator. TEST the system for normal operation. A4 TEST CIRCUIT 1003 (GY/YE) FOR OPEN Measure the resistance of circuit 1003 (GY/YE) between the output side of fuse 10 (7.5A) and the shift lock actuator C289 pin 3.

• Is the resistance 5 ohms or less?

Yes GO to A5 .

No REPAIR circuit 1003 (GY/YE) for open. TEST the system for normal operation. A5 CHECK FUSE 9 (7.5A)
Fuse 9 (7.5A)
Measure the resistance of fuse 9 (7.5A).

• Is the resistance 5 ohms or less?

Yes GO to A8 .

No GO to A6 . A6 TEST CIRCUIT 276 (BN) FOR SHORT TO GROUND.
Brake Pedal Position (BPP) Switch C224
Measure the resistance of circuit 276 (BN) between C224 pin 3 and ground.

• Is the resistance 10 K ohms or less?

Yes REPAIR circuit 276 (BN) for short to ground. TEST the system for normal operation.

No GO to A7 . A7 TEST CIRCUIT 810 (RD/LG) FOR SHORT TO GROUND
Shift Lock Actuator C289
Depress the brake pedal and measure the resistance between C289 pin 1 and ground.

• Is the resistance 10 K ohms or less?

Yes REPAIR circuit 810 (RD/LG) for short to ground. TEST the system for normal operation.

No INSTALL a new shift lock actuator. TEST the system for normal operation. A8 CHECK FOR B+ ON CIRCUIT 810 (RD/LG)
Shift Lock Actuator C289
Depress the brake pedal and measure voltage at C289 pin 1.

• Is the voltage 10 volts or greater?

Yes GO to A12 .

No GO to A9 . A9 TEST CIRCUIT 276 (BN) FOR OPEN
Brake Pedal Position (BPP) Switch C224
Measure the resistance between the output side of fuse 9 (7.5A) and the brake pedal position switch pin 3, circuit 276 (BN).

• Is the resistance 5 ohms or less?

Yes GO to A10 .

No REPAIR circuit 276 (BN) for open. TEST the system for normal operation. A10 TEST BRAKE PEDAL POSITION SWITCH Measure the resistance of the brake pedal position switch, while open (OFF) and closed (ON), between pin 2 and pin 3 of C224.

• Is the resistance of the switch greater than 10 K ohms while OFF and 5 ohms or less while ON?

Yes GO to A11 .

No INSTALL a new switch. TEST the system for normal operation. A11 TEST CIRCUIT 810 (RD/LG) FOR OPEN
Brake Pedal Position (BPP) Switch C224

Shift Lock Actuator C289
Measure the resistance between C224 pin 2 and C289 pin 1.

• Is the resistance 5 ohms or less?

Yes INSTALL a new shift lock actuator. TEST the system for normal operation

No REPAIR circuit 810 (RD/LG) for open. TEST the system for normal operation. A12 CHECK CIRCUIT 57 (BK) FOR AN OPEN Measure the resistance between the shift lock actuator C289 pin 2, circuit 57 (BK), harness side and ground.

• Is the resistance less than 5 ohms?

Yes INSTALL a new shift lock actuator. REFER to Brake Shift Interlock Actuator in this section. TEST the system for normal operation.

No REPAIR circuit 57 (BK). RECONNECT all components. TEST the system for normal

You have a shift interlock problem . What kind of vehicle ? a mercury what ?
Shift Interlock System
The shift interlock system prevents shifting from PARK unless the brake pedal is depressed. The shift interlock system consists of a shift lock actuator mounted on the selector lever. If the ignition switch is in the RUN position, the shift lock actuator is disabled when the brake pedal is depressed.
If the selector lever will not move out of PARK with the key in the ON position and the brake pedal depressed, it will need to be unlocked manually.
Do the brake lights work ?
Visually inspect for obvious signs of mechanical and electrical damage; refer to the following chart:

Visual Inspection Chart Mechanical Electrical

• Damaged shift lock actuator
• Damaged transmission control (TC) switch
• Damaged shift interlock switch

• Failed fuse(s):
  • F20 (10A)
  • F22 (15A)
• Damaged wiring harness
• Loose or corroded connections
• Damaged shift interlock switch

Symptom Chart Condition Possible Sources Action

• Shift interlock system does not release/lock correctly

• Circuitry
• Fuse(s):
  • F20 (10A)
  • F22 (15A)
• Brake pedal position (BPP) switch
• Brake shift interlock actuator
• Brake shift interlock actuator module

• Go To Pinpoint Test A .

PINPOINT TEST A: SHIFT INTERLOCK SYSTEM DOES NOT RELEASE/LOCK CORRECTLY Test Step Result / Action to Take A1 TEST THE BRAKE LIGHTS

• Apply brake pedal and view brake lights.
• Do brake lights illuminate?

Yes
GO to A7 .

No
GO to A2 . A2 TEST FUSE F22 (15A)

• Key in OFF position.
• Check fuse: Smart Junction Box (SJB) Fuse F22 (15A).
• Is the resistance less than 5 ohms?

Yes
GO to A4 .

No
GO to A3 . A3 TEST THE CIRCUIT FOR A SHORT TO GROUND

• Key in OFF position.
• Disconnect: Brake Pedal Position (BPP) Switch.
• Measure the resistance between pin 1 and ground.
  
• Is the resistance greater than 10,000 ohms?

Yes
GO to A4 .

No
REPAIR circuit for short to ground. TEST the system for normal operation
Do

Remove the steering column's upper and lower covers. Then remove the shift cable from actuator and then remove the electrical connector and then remove the screws to remove the actuator from the steering column.

.
Shift Interlock System
The shift interlock system prevents a shift out of PARK unless the brake pedal is depressed. The shift interlock system has a shift lock actuator mounted on the floor shifter assembly. If the ignition switch is in the RUN position, the shift actuator will allow the shifter to be moved out of PARK only when the brake pedal is pressed.
Electroniclly controlled !

Condition Possible Sources Action

• The shift interlock system does not release or lock correctly

• Fuse in battery junction box (BJB)

• Check fuses.

• Brake pedal position (BPP) switch

• CHECK the BPP switch. REFER to Section 206-09 .

• Floor shifter wiring and/or connectors
• Transmission selector lever
• Ignition system

• Go To Pinpoint Test A .

column or floor shifter ?
Brake Shift Interlock Actuator - Floor Shift Removal and Installation
NOTE: The brake shift interlock actuator is not serviced individually. If replacement is required, install a new floor shift selector lever assembly.
For additional information, refer to Selector Lever - Floor Shift in this section.
Brake Shift Interlock Actuator - Column Shift Removal and Installation

1. Set the parking brake.

1. Remove the steering column shrouds.

1. Turn the ignition to the accessory position and apply the brake or actuate the brake shift interlock actuator (BSIA) override.

1. Put the selector lever into the NEUTRAL position.

1. Disconnect the BSIA electrical connector.

1. Remove the BSIA screw.

1. Gently pry the clip up and remove the BSIA.

1. NOTE: During installation, verify that the BSIA override has been activated and the slider is fully rearward. Before rotating the selector lever from NEUTRAL into PARK, align the selector lever tab into the BSIA. To install, reverse the removal procedure.

fuse #7 - 15 amp , Fuse #21 - 10 amp.

Maybe you blew solid state module. There is a manual bypass.

Shift Interlock System A shift interlock mechanism prevents shifting the transaxle out of the PARK position unless the brake pedal (2455) is applied. The shift lock actuator is energized when the ignition switch is turned to the RUN position.

• This locks the shifter in the PARK position.
• When the brake pedal is applied and the stoplight switch (13480) is activated, the shift lock actuator is deactivated and the shifter can be moved out of the PARK position.

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• Shift Interlock System Does Not Release or Lock Properly

• Fuse.
• Circuit.
• Shift lock actuator.
• Gearshift lever adjustment.
• Stoplight switch.

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The shift interlock system prevents the shifting from PARK unless the brake pedal (2455) is depressed. The shift interlock system consists of a shift lock actuator (3Z719) mounted at the base of the steering column tube (3514). If the ignition switch (11572) is in the RUN position, the shift lock actuator is continually on unless the brake pedal is depressed. The shift lock actuator is the logical culprit. Check to see if it's getting voltage when the brake pedal is depressed. If yes: the unit is either faulty, weak or stuck. I can provide wire numbers and colors if necessary. I may need the engine size and Trans. code found on drivers door sticker. Good luck! Aoogha