Initial Inspection and Diagnostic Overview

1. Verify the concern by operating the vehicle and applying the brakes under different conditions to duplicate the condition.
2. Visually inspect to determine if one of the following mechanical or electrical concerns apply:
Mechanical:
- Parking brake binding
- Improperly inflated tires.
- Mismatched wheels or tires on vehicle.
Electrical:
- Blown Fuses:
- Power Distribution Box Fuse - ABS (30A)
- Fuse Junction Panel - Fuse 15 (10A)
- Damaged Connectors.
- Disconnected connectors.
3. If the inspection reveals an obvious concern that is readily serviced, correct the concern and retest before continuing.
4. If a concern remains after the inspection connect the Rotunda New Generation Star (NGS) Tester or equivalent to the data link connector (DLC) located beneath the instrument panel to perform Data Link Diagnostics test. If the NGS responds with NO RESPONSE/NOT EQUIPPED for the anti-lock brake module, go to Pinpoint Test A. A
5. If the Data Link Diagnostics test is passed for the anti-lock brake control module, retrieve continuous Diagnostic Trouble Codes (DTC)s and execute self test diagnostics for the anti-lock brake control module to retrieve current DTCs. [1][2]Diagnostic Trouble Code Tests and Associated Procedures
6. If self test is passed and no DTCs are retrieved go to the Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures
7. If DTCs are retrieved, go to Anti-Lock Brake Control Module DTC Index to continue diagnostics. Diagnostic Trouble Code Descriptions
8. If the anti-lock brake control module cannot be accessed by the NGS, go to Pinpoint Test A. A

NOTE: Rotunda Service Bay Diagnostic System (SBDS) or equivalent may also be used to diagnose this system. Tools and Equipment