Electric Frunk (Variant B MARK 4/5)

This is the installation guide for Tesla Model 3 Electric Frunk (Variant B Mark 4/5) from EVOffer.

Model 3 Electric Frunk - EVOffer (Tesla Offer)EVOffer (Tesla Offer)

Feature

Touch Screen	Tesla Official App	Button	Key Fob
Open/Close	Open/Close	Close	Open/Close

Settings

Height Setting

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

Speed Setting

When the frunk 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. Motorized Strut x 2

3. Struts Backplate (L and R)

4. 3M Tape

5. Cable ties

6. ECU Unit

7. Signal Wire Harness

8. Fuse Cable

9. ECU Wire Harness

10. Buzzer

Tools

1. 10mm Hex Socket

2. 13mm Hex Socket

3. Wrench

4. Small Flat Head Screwdriver

5. Pry Tool

6. Electrical Tape

Installation

Step 1 - Removing Trim Pieces

Remove the cover panel piece on the top of the frunk. Pull it out with bare hand. Then remove the air inlet piece as shown in picture.

Step 2 - Detaching Button

Pull out the small cover on the front of the frunk. Then unplug the wire from the emergency button.

Pull out the cover

Unplug the wire

Step 3 - Removing the Frunk Well

There are 7 10mm hex screws as indicated. Remove all of them. Then you can pull out the frunk tray.

Step 4 - Replacing the Struts

Now we will remove the struts. Let's start with the left side of the car. Insert a flathead screwdriver into the channel as shown in the picture, and then with one hand pushing up the hood a bit, pull the strut out.

Repeat the same thing to the lower ball joint.

Now the hood might fall so be caution. On the top joint, use a 13mm hex socket to remove the screws to remove the OEM back plate. Replace it with our back plate marked "L" (Note: The two back plate we provided are different. One has a "R" on it and one has a "L" on it. Use the "L" on the left side of the car. )

Replace the backplate with our plate that is marked "L"

Tighten the screws again

Insert one of our strut into the lower joint (the side of the strut that near the wire). Don't insert it to the upper joint yet, because it will make it more difficult to remove the right strut.

insert the strut into the lower joint.

Now go ahead and remove the right strut from the upper joint. After you remove the upper joint of the right OEM strut, the hood will be completely freed, so use a hand to support the hood. Now go back to the left side of the car and mount the left strut to the upper joint.

Remove the right OEM strut completely, then do the same thing as you did to the left side of the car (swap the backplate, and mount the right strut)

The struts are successfully installed. Run the wires beneath the trim piece to the location where the battery is located, and then attach the connectors to the major wire harness.

Connect the connector pair from each strut to the major wire harness.

Step 5 - Adding Latching Mechanism

User some electrical tape or marker to mark the original position of the latch.

Remove the 10mm hex screws as indicated in the picture.

Remove the spring on the latch.

Hook our latching mechanism plate (the black one attached on our latch wire) and then put back the removed spring.

Now put the latch mechanism back and tighten the two 10mm bolts.

Step 6 - Connecting the signal wire

Now take out the signal wire. There are two connector pairs.

Unplug the OEM connector from the lock motor that is located on the right side of your car (if you are facing toward the car it's on your left side).

Connect one side of our blue connector pair to the removed OEM connector, and plug the other side of our blue connector back into the lock motor.

Now remove the OEM plug from the latching lock. Plug the OEM plug to one side of our corresponding connector pair, and the other side of our corresponding connector pair back to the latching lock. Make sure they are fully inserted.

Now connect the landing check wire to our latching bracket.

On the other side of the signal wire, connect the black little connector to the 4-pin or 6-pin connector from the major wire harness.

Now connect the brown connector from the major wire harness to the latch motor, and fix the latch motor by cable tie.

Tie the latch motor here. There's two hole, one hole is smaller so use the thinner cable tie.

Attach the brown connector from the wire bundle to the latch motor

Step 7 - Connecting the power and ground

Get the small black wire that come with the fuse. Insect the metal end into the positive terminal of the 12V battery. You need to use a 10mm hex socket to loosen the terminal and insert the metal below the metal nut, and then tighten it again.

Loosen the 10mm nut from positive terminal

Insert the fork crimp into the positive terminal, tighten the nut

On the other side of the fuse wire, unplug the white plug, and connect the silver terminal from the major wire harness to the plug, then connect it back to the fuse wire.

Unplug the white plug

Insert the silver terminal into the white plug as indicated, make sure it is fully inserted and locked

Connect the white plugs together again

Wrap the white connections and the fuse box with electrical tape

Connect the ground (the golden spade terminal that come with the wire harness) to the indicated location, it's in the left side of the car, under a 10mm hex nut.

Ground connection

Step 8 - Finishing up

Connect the buzzer to the major wire harness by the 2pin connector

Connect the big plug from the major wire harness to the waterproof control unit.

push in and release the lock of the plug

Insert the plug into the control unit, and the rotate the plug handle to lock the plug.

The light on the control unit should be blinking constantly.

Step 9 - Testing the system

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 got released.

Next we will do the landing check functionality. With the hood opened, double click on the button on our control unit. You will hear the motor start to move. After the double click, try to check the frunk status on your screen. If the frunk status is still showing the frunk as "opened", then the landing check functionality is good. Otherwise, try to contact us for a newer firmware.

Please make sure the latch mechanism is hooked into the latch before doing the landing check. Doing landing check before hooking in will damage the latch motor.

Now push the lever arm thing down on our add-on bracket. While you push down the lever arm, do the double click test again. After that, the lock should be fully latched. Go back to the car's screen and make sure the frunk is shown as "closed".

Hold the black button on the control unit until you hear a beep to initialize the system. After initialized, 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

GitHub - evoffer/electric-liftgate-firmware: Firmware Update for Electric Liftgate Systems (Tesla Model S/X/3/Y) from EVOffer (Tesla Offer)GitHub

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!