For 1990-2009 cars
ABS Components
Antilock Brake System Schematics
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

### Circuit Description

The EBCM exchanges serial data through EBCM harness connector terminal 12.

Connector terminal 4 supplies the switched ignition voltage to the EBCM.

Connector terminal 13 supplies the battery voltage to the EBCM.

Connector terminal C supplies the switched battery voltage to the EBCM.

Connector 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

#### No Communication With EBCM

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the ABS Diagnostic System Check performed? | -- | Go to DTC U1001-U1254 Loss of XXX Communications in Data Link Communications | Go to Diagnostic System Check - ABS