No Communication With EBTCM

CIRCUIT DESCRIPTION
Serial data is transmitted/received by the Electronic Brake Control Module (EBCM) through terminal Al. The EBCM is supplied switched ignition voltage through connector C1 terminal A9 and battery feed voltage through connector C1 terminal B12. The EBCM ground is provided through connector C2 terminal D.

DIAGNOSTIC AIDS
Communication with the Electronic Brake Control Module (EBCM) is not possible when excessive resistance exists in the following components:
^ The ground
^ The power supply circuits

If communication with the EBCM is not possible, perform the following actions:
^ Verify that the EBCM ground connection is good.
^ Verify that no excessive resistance exists in any of the power supply circuits.

TEST DESCRIPTION
5. This test checks for high resistance in the Electronic Brake Control Module (EBCM) ground circuit.
6. This test checks for an open in the EBCM battery feed circuit.
7. This test checks for an open or high resistance in the EBCM switched ignition circuit.
8. This test checks for an open or high resistance in the EBCM serial data circuit.
9. This test checks for a short to ground in the EBCM serial data circuit.
11. This test checks for a short to ground in the EBCM battery feed circuit.
12. This test checks for a short to ground in the EBCM switched ignition circuit.

Part 1 Of 2:

Part 2 Of 2:

NO COMMUNICATION WITH EBCM