Electric Frunk (Mark 4.0)

This is the installation guide for Tesla Model Y Electric Frunk (Mark 4.0) from Tesla Offer.


Touch Screen

Tesla Official App


Key Fob






Height Setting

Adjust the liftgate to your desired height. Press and hold the button on the control unit for about 5 seconds, until you hear a beep (Make sure the buzzer is connected).

Speed Setting

When the liftgate is in open state, press and hold the button on the control unit. You will eventually hear two long beeps (speed 2), three long beeps (speed 3), four long beeps (speed 4), up to six long beeps (speed 6). Release the button after you hear the speed you want to set. The slowest speed is speed 2 and the highest speed is speed 6. The factory default is at speed 4.

Packing List

  1. Lock Assembly with Latch Motor

  2. Replacement Strut x 2

  3. Struts Backplate (L and R)

  4. 3M Tape

  5. Cable Ties

  6. Control Unit

  7. Signal Wire

  8. Fuse Cable

  9. Wire Bundle

  10. Buzzer


  1. 10mm Hex Socket

  2. 13mm Hex Socket (a long socket or a 13-mm wrench)

  3. Precision Pick Tool (For Internal strut removal)

  4. Allen Hex Key or T-30 socket

  5. Short Wrench


Step 1

Remove the cover panel piece on the top of the frunk. Pull it out with bare hand.

Next, remove the 4 10mm screws and take out the frunk liner

Step 2

Now remove the struts. The strut is hidden but can be easily spotted on two side. Use a precision pick to insert into the band (easier to insert from bottom) and then pull the strut out. Remove the strut from the lower joint as well.

Remove the other struts as well. The hood will start to fall after one strut is removed so it's better to have someone holding the hood. It is recommended to remove both struts before installing the replacement strut otherwise it will be more difficult to remove the second strut.

Unbolt the lower joint that hold the strut using a 13mm wrench.

Using an Allen hex key or a T-30 driver, install our backplate (R means Passenger side on LHD car, L means driver side on LHD car) using the screw provided. Do it on both side.

Install the struts. Try to fit the lower joint first (wire side on the bottom), then install the top joint.

Step 3

Now the difficult part is done, do the latch part. Remove the latch by unbolting the two 10mm hex screws that are holding it. Also unplug the connector from the latch (the green circled one in the picture)

Attach our latch mechanism as shown in the picture. You need to remove the spring first, hook in our latch mechanism, then re-attach the spring. then bolt on the whole assembly back into the car. Also connect our signal wire harness into the latch unit, and then connect the existing OEM connector back to the female part of our connector pair.

Step 4

Run the emergency wire to the tow cap. Pry the tow cap and use electrical tape to wrap the emergency wire together with the jump starter wire.

Step 5

Connect the brown connector from the major wire harness to the latch motor, and zip tie the latch motor to avoid it from moving. Try to zip tie the latch motor in a lower location behind the wheel well.

Now attach the blue connector pair to the lock motor unit (located on the right side of the car, if you are facing toward the car it's on your left side)

Step 6

Now it's time to connect power and ground. Take out the power cable, and insert it into the 12v battery (loosen the 10mm nut, insert and retighten)

Connect the silver spade connector into this power wire. (remove the male connector plug from the power wire, insert the silver spade into the male connector, then connect it back to the 12v wire)

For the ground connection, tap the gold metal spade into any ground you can find (the red circled locations are some suggestion)

Step 7

Connect the signal wire into the major wire harness (4 pin black connector)

Connect the buzzer to the major harness.

Connect the strut wires to the major harness.

Now plug the big connector to the control unit, and set it to the indicated location

Step 8

Now the system is ready to be tested. We need to make sure the latch can be released after locking, so use your hand or a screwdriver, push downward on the latch to "lock" the latch. Then plug in the OEM wire back to the emergency button (On the little cover that you removed). Press the emergency button to make sure the latch release.

If the latch release, then the system is ready to be tested. Hold the black button on the control unit until you hear a beep to initialize the system. After initialize, press the emergency button to test the frunk closing. If the frunk close successfully, then go to open the frunk from the touchscreen to test the opening.

Software Update

Step 1 - Preparing Memory Card

Prepare a microSD with 32GB or below capacity. Make sure it is in FAT32 format.

Step 2 - Getting the Update File

Get the update file ready. The file would be provided by tech support if needed. Rename the file to update.yst and place it under the root of the microSD.

Eject it from the card reader afterwards.

Step 3 - Flashing the Update

Insert the microSD into the control unit. The red LED will be flashing rapidly.

Wait until the LED becomes solid and eject the microSD.

Complete! Test the System

The LED should be flashing constantly now and you are all set!