Circuit Description: Delphi
WARNING: This page is about a different car, the 2004 Suzuki Swift + and 2004 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
Serial data is transmitted/received by the electronic brake control module (EBCM) through terminal 21. The EBCM is supplied with constant battery feed voltage through terminals 1 and 2, and switched ignition voltage through terminal 13. The EBCM ground is provided through terminal 14 and 15.