Light My Bricks : Police Car LED Lighting Kit

Here is the instructions document for lighting up a Lego Police Car. This process can be used to lighting up any Lego Police Car, Fire Truck, Ambulance, etc. This particular set of instructions is for the Chief Wiggum Police Car from the Kwik-E-Mart Lego set. You may have to modify your process slightly depending on what Lego car you are trying to install this to. Please read and follow the steps carefully to ensure this lighting kit is installed properly.

If you are viewing this user guide as a PDF file, you can also view this online by clicking here.


Package contents:

  • 2x Flashing Bit Lights
  • 4x Standard Bit Lights
  • 1x 8-Port Expansion Board
  • 1x Flat Battery pack (2x CR2032 batteries required)

Important things to note:

Laying cables in between and underneath bricks

Cables can fit in between and underneath LEGO® bricks, plates, and tiles providing they are laid correctly between the LEGO® studs. Do NOT forcefully join LEGO® together around cables; instead ensure they are laying comfortably in between each stud.

CAUTION: Forcing LEGO® to connect over a cable can result in damaging the cable and light.

Connecting cable connectors to Expansion Boards

Take extra care when inserting connectors to ports of Expansion Boards. Connectors can be inserted only one way. With the expansion board facing up, look for the soldered “=” symbol on the left side of the port. The connector side with the wires exposed should be facing toward the soldered “=” symbol as you insert into the port. If a plug won’t fit easily into a port connector, do not force it.

WARNING: Incorrectly inserting the connector can result in bent pins inside the port or possible overheating of the expansion board when connected.Installing Bit Lights under LEGO® bricks and plates.

Installing Bit Lights under LEGO® bricks and plates.

When installing Bit Lights under LEGO® pieces, ensure they are placed the correct way up (Yellow LED component exposed). You can either place them directly on top of LEGO® studs or in between.


OK, Let’s Begin!


Instructions for installing this kit

1.) Start by removing the following Lego pieces which make up the roof and windscreen, followed by the black Lego plates and tiles from the front bonnet.

2.)Disconnect from each side of the car, the black 1 x 1 brick with the transparent yellow plate attached. Remove the yellow plate from the black brick and take 1 standard bit light (non flashing) and using the connector end of the cable of the LED, thread this through the hole of the front of the black brick.

Pull the cable from the back of the black brick all the way until the LED component is flat up against the other side of the brick. Ensure that the LED component part is facing the correct way up, then secure this down by reconnecting the transparent yellow Lego plate over the top.

Repeat this step for the other head light of the car.

3.) Reconnect the 2 head lights back to the front of the car ensuring the cables for the lights are facing up.

4.) Next step is to remove the following Lego pieces from the car so that we can lay the cables from the headlights underneath and all the way to the back.

5.) Thread the 2 cables through the small holes behind the front seats, 1 cable through each hole.

Ensure the cables are laid on the side of each of the brown Lego studs

6.) Start securing the cables down by reconnecting back Lego plates and tiles over the top. Before doing so, ensure that the cables are laid in between studs exactly the same way as the below images.

7.) Reconnect the white bricks as per below ensuring that the cables are laid in between the black and white studs underneath.

We can now also reconnect the Lego pieces which make up the front of the dash board, side mirrors, and front windscreen.

8.) In order to hide the rest of the contents from this lighting kit in the back section of the car, we will be removing and discarding the following pieces.

First, turn the car around to the back and remove the back bumper with tail lights attached, followed by the boot cover.

9.) Continue to remove the following pieces from the back of the car.

10.) Turn the car over and remove the following pieces.

11.) Remove the 2 grey bricks with plates attached below, then separate these pieces and hang on to the 2 grey plates.

12.) Remove the following pieces from the rear wheels and then connect to the axle, the 2 grey pieces we kept in the previous step in the following position.

13.) We are now ready to install the 2 tail lights. Take the bumper with lights attached and remove the 2 transparent red plates.

Take another standard bit light and place it in between the 2 grey studs. Secure this LED in place by reconnecting a transparent red plate over the top.

Repeat this step for the 2nd tail light then reconnect the bumper to the back section of the car.

14.) Secure the 2 cables from the tail lights to the inside of the boot by laying them in between studs underneath the black plate on each side.

15.) Take the 2 cables and then pull them together and twist them around so they both come together. Wind the cables around the axle of the rear wheels a few times until you have about 2–3 cm of excess cable left on each side.

Connect these 2 lights to first available ports on the 8-port expansion board

16.) Reconnect the rear wheels along with the back section of the car to the rest of the car using the 2 grey Lego pieces.

Flip the car over and then reconnect the 2 long black plates (which we removed earlier). This will then allow the back section of the car to be secured to the car.

17.) Take the 2 cables from the front lights and twist them around so they come together. Thread them down the space in between the axle and the grey Lego piece (4 grey studs).

Turn the car over and then pull the 2 cables up from underneath all the way and then then thread them down again over the axle. Repeat this process a few times (threading the cable around the axle) until there is only approx 3 cm left of the cable.

Plug the 2 cables into the next available ports on the expansion board.

18.) We will now install flashing lights to the siren lights on the roof of the car. Take the roof and remove the long white plates on each side.

Remove the transparent red Lego tile and then take one of the flashing bit lights and place it in between the 2 grey studs, then secure the LED in place by reconnecting the transparent red tile over the top.

Repeat this process using another flashing bit light for the blue light. Then reconnect the long white tiles on each side ensuring the cables are pulled down in between.

19.) Take the 2 cables from underneath the roof and twist them so that they come together. Wind them around so they form a neat loop of cables with a diameter of around 1.5cm. Use a bit of tape to hold them together, preventing them from untangling.

20.) Place the roof with lights installed on top of the car and then connect the 2 flashing bit light cables into the next available ports on the expansion board.

21.) Take the flat battery pack and insert 2x CR2032 batteries, then connect the battery pack cable to the spare port on the expansion board.

Place the battery pack in the following position ensuring that the on/off switch is facing the outside.

24.) Reconnect the pieces that surround the boot of the car to secure the battery pack.

25.) Reconnect the the side windows and back windscreen before reconnecting back the roof of the car. While doing so, ensure that the cables from the flashing lights are neatly kept in the back section underneath.

Installation of this lighting kit is now complete.

Turn on the battery pack, turn off the lights in the room, and Enjoy!

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