No Communication with Electronic Brake Control Module

No Communication with Electronic Brake Control Module

Circuit Description

Serial data is transmitted/received by the electronic brake control module (EBCM) through terminal B6. The EBCM is supplied with constant battery feed voltage through terminals A and B, and switched ignition voltage through terminal A11. The EBCM ground is provided through terminal D and C.

Diagnostic Aids

Typical causes of no communication with the EBCM:

* Poor terminal contact at the EBCM
* Loss of EBCM ground to terminal D and C
* Loss of battery voltage at EBCM terminals A and/or B
* Loss of ignition voltage at EBCM A11
* Open/grounded data line
* Data line with high resistance