GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

Connect the Scan Tool to the data link connector (DLC).

The scan tool main menu appears on the scan tool.

Scan Tool Inoperative

2

Access the class 2 DTC's using the scan tool.

No DTC's found.

The module(s) listed will have DTC's present.

Refer to Diagnostic Trouble Code (DTC) List/Type .

3

  1. Select Body Diagnostics from the scan tools menu.
  2. Select SIR UART Data Line information.
  3. Access DTC's using the scan tool.

No DTC's found.

Scan Tool Does Not Communicate with Components

4

  1. Establish communication with the Electronic Brake Control Module (EBCM)
  2. Access DTC's using the scan tool.

No DTC's found.

No Communication with Electronic Brake Control Module .

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.