No Communication With EBTCM

Part 1 Of 2:

Part 2 Of 2:

CIRCUIT DESCRIPTION
The EBCM exchanges serial data through the connector C2 terminal A1.
Connector C2 terminal A9 supplies the switched ignition voltage to the EBCM.
Connector C2 terminal B12 supplies the battery voltage to the EBCM.
Connector C1 terminal C supplies the switched battery voltage to the EBCM.
Connector C1 Terminal D provides the ground for the EBCM.

DIAGNOSTIC AIDS
Communication with the 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 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.