System Pre-Checks

Visual Inspection Chart:

1. Verify the customer's concern by operating the vehicle and applying the brakes under different conditions to duplicate the condition.
2. Inspect to determine if one of the following mechanical or electrical concerns apply:
3. If the inspection reveals obvious concern(s) that can be readily identified, service as required.
4. If the concern remains after inspection, connect the Rotunda New Generation Star (NGS) Tester, or equivalent scan tool, to the data link connector (DLC) located beneath the instrument panel to perform DATA LINK DIAGNOSTIC TEST. If the scan tool responds with NO RESPONSE/NOT EQUIPPED for anti-lock brake control module, go to Pinpoint Test A. If the DATA LINK DIAGNOSTIC TEST is passed for the anti-lock brake control module, retrieve continuous DTC's and execute Self-Test Diagnostics for anti-lock brake control module.
5. The anti-lock brake control module cannot store a diagnostic trouble code if there is no power to the anti-lock brake control module. This condition can be found by using the Anti-Lock Quick Check Sheet. Quick Tests
6. If DTC's are retrieved, go to the Anti-Lock Brake Control Module Diagnostic Trouble Code (DTC) Index to continue diagnostics. Diagnostic Trouble Code Descriptions
7. If the anti-lock brake control module cannot be accessed by the NGS tester, go to Pinpoint Test A. A No Communication with ABS Control Module

WARNING: FOLLOWING THE WRONG SEQUENCE OR BYPASSING STEPS WILL LEAD TO UNNECESSARY REPLACEMENT OF PARTS, AND/OR INCORRECT RESOLUTION OF THE SYMPTOM.

PROCEDURES
- Refer to Brakes - System Diagnosis for diagnosing base brake system faults. Testing and Inspection
- Refer to System Diagnosis for Quick Test. Component Tests and General Diagnostics