No Communication With EBCM

No Communication with EBCM






Circuit Description
Serial Data is transmitted/received by the EBCM through terminal 7. The EBCM is supplied with constant battery feed voltage through terminals 9 and 25, and switched ignition voltage through terminal 4. The EBCM ground is provided through terminal 8 and 24.

Diagnostic Aids
Typical causes of no communication with the EBCM.
1) Poor terminal contact at the EBCM.
2) Loss of EBCM ground to terminal 8 and 24.
3) Loss of battery voltage at EBCM terminals 9 and/or 25.
4) Loss of ignition voltage at EBCM 4.
5) Open/grounded data line.
6) Data line with high resistance.








Troubleshooting