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Hydraulic Brake System Diagnostic System Check

WARNING: This page is about a different car, the 2003 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.

  1. 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.
  2. 4  - The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile the available information before tests are performed.

  1. Turn ignition switch to OFF. Connect scan tool to Data Link Connector (DLC). Attempt to power up scan tool. If scan tool powers up, go to next step. If scan tool does not power up, see SCAN TOOL DOES NOT POWER UP in appropriate BODY CONTROL MODULES article.
  2. Turn ignition switch to ON. Using scan tool attempt to establish communications with Electronic Brake Control Module (EBCM) and Instrument Panel Cluster (IPC). If communications are successfully established with specified modules, go to next step. If communications cannot be established, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in appropriate BODY CONTROL MODULES article.
  3. Select DISPLAY DTCs function on scan tool for EBCM and IPC. If scan tool displays DTCs, go to next step. If scan tool does not display DTCs, repair brake system by symptom. Investigate suspected faulty components for leaking or physical damage. Repair as necessary.
  4. If DTC C1247 is retrieved, perform DTC C1247: BRAKE FLUID SWITCH INPUT GROUNDED  under DIAGNOSTIC TESTS. If DTC(s) other than C1247 are displayed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate BODY CONTROL MODULES article.
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