GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

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 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

Select the ABS/TCS/Active Handling display DTC function on the scan tool.

Does the scan tool display any ABS/TCS/Active Handling (if equipped) DTCs?

--

Go to Diagnostic Trouble Code (DTC) List/Type

Go to Step 4

4

Select the Magnasteer® display DTC function on the scan tool.

Does the scan tool display DTC C1241?

--

Go to DTC C1241 Magnasteer Malfunction

Go to Symptoms