No Communication With EBCM

No Communication with EBCM






Circuit Description
Serial Data is transmitted/received by the 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.
1. Poor terminal contact at the EBCM.
2. Loss of EBCM ground to terminal D and C.
3. Loss of battery voltage at EBCM terminals A and/or B.
4. Loss of ignition voltage at EBCM 11.
5. Open/grounded data line.

Steps 1 & 2:

Steps 3-15:

6. Data line with high resistance.