Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

2: Lack of communication may be due to a partial malfunction of the serial data circuit or due to a total malfunction of the serial data circuit. The specified procedure will determine the particular condition.
4: The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure with compile the available information before tests are performed.

Diagnostic System Check - Hydraulic Brakes

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 Communication
2	Turn ON the ignition, with the engine OFF. Attempt to establish communication with the following control modules: Electronic brake control module (EBCM) Instrument panel cluster (IPC) Does the scan tool communicate with all control modules?	Go to Step 3	Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communication
3	Select the display DTCs function on the scan tool for the following control modules: Electronic brake control module (EBCM) Instrument panel cluster (IPC) Does the scan tool display any DTCs?	Go to Step 4	Go to Symptoms - Hydraulic Brakes
4	Does the scan tool display any DTCs which begin with a "U"?	Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communication	Go to Diagnostic Trouble Code (DTC) List