GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Install a scan tool.

Does the scan tool power up?

Go to Step 2

Go to Scan Tool Does Not Power Up in Data Link Communications

2

  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to establish communications with the Electronic Brake Control Module (EBCM).

Does the scan tool communicate with the EBCM?

Go to Step 3

Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications

3

With the scan tool, Select the ABS Diagnostic Trouble Code (DTCs) function on the scan tool.

Does the scan tool display any ABS DTCs?

Go to Diagnostic System Check - ABS in Antilock Brake System

Go to Step 4

4

Does the scan tool display DTC C1245?

Go to DTC C1245

System OK