Installation Instructions
1) Before starting the installation make sure the vehicle is turned off and the key is removed.
2) Find a suitable location to mount the BCS. In most cases the unit is installed in a spot below the center console. The unit is held in place with the Velcro that is provided.
3) Remove the dash cover cap located on the top of the dash by pushing forward and lifting off.
4) Remove the torx screws on the driver side dash cover and remove the cover. This will provide access to the ECU.
5) To improve access to the wiring harness, unplug the connectors and remove the engine computer. The computer is held in place by plastic clips.
6) Route the BCS wires up to the engine computer area.
7) Remove the ECU connector covers by cutting the zip ties and pulling off the covers from the connector housings.
8) Remove about eight inches of the cloth tape around the ECU wiring harness.
9) Make the connections about six inches away from the ECU connectors.
10) Use the ECU pin diagram below to help you locate the correct wires to connect into.
11) Verify the correct wire for each connection by pin number and wire color code.

See the reverse side of this page for wiring instructions.

Calibration Procedure
The rear panel calibration adjustment allows you to fine tune the BCS for your vehicle. If the setting is too high or too low, your car will not make full power. After the BCS is installed, the rear panel adjustment can be set during a short test drive. Start with the setting on maximum (100). See if the car pulls strongly to redline. Turn down the setting until the cars pulls strongly to redline in all gears. If the cars surges (cyclic variation in power), turn down the setting a little bit.

Download pdf Volkswagen Beetle 1.8T BCS (Boost Control System) engine installation instructions