Initial Inspection and Diagnostic Overview

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 mechanical or electrical conditions apply.

Mechanical Electrical

- Parking brake cable binding. - Blown fuses.
- Improperly inflated tires. - Damaged connectors.
- Mismatched wheels or tires. - Disconnected connectors.

3. If inspection reveals an obvious concern that is readily serviced, correct the concern before continuing with inspection.
4. If a concern remains after the inspection, use the Rotunda New Generation Star (NGS) Tester 007-00500 or equivalent connected to the Data Link Connector (DLC) to retrieve continuous Diagnostic Trouble Codes (DTCs) and to execute self test diagnostics for the anti-lock brake module. If after performing data link diagnostic test, the tester responds with module NO RESPONSE/NOT EQUIPPED, go to Pinpoint Test A. A No Communication with ABS Control Module
5. If self test is passed and no DTCs are retrieved, go to the Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures
6. If DTCs are retrieved, go to DTC Index to continue diagnostics. Diagnostic Trouble Code (DTC) Index
7. If the anti-lock brake module cannot be accessed by the New Generation Star Tester, go to Pinpoint Test A. A No Communication with ABS Control Module

NOTE:m Rotunda Service Bay Diagnostic System 001-00001 may also be used to diagnose this system.