A Symptoms - Antilock Brake System

Important: The following steps must be completed before using the symptom tables.

1. Perform the A Diagnostic System Check - ABS before using the Symptom Tables in order to verify that all of the following are true:
- There are no DTCs set.
- The control module(s) can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following:
- ABS Description
- ABS Operation

Visual/Physical Inspection
- Inspect for aftermarket devices which could affect the operation of the antilock brake system. Refer to Checking Aftermarket Accessories.
- Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
- Inspect the master cylinder reservoir for the proper brake fluid level.

Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
- No Communication with EBCM
- Vehicle Stability Enhancement System Inoperative (w/JL4J
- Vehicle Stability Enhancement System Unwanted Activation (w/JL4)
- Vehicle Stability Enhancement System Excessive Brake Pulsation (w/JL4)
- ABS Indicator Always On
- ABS Indicator Inoperative
- TRACTION CONTROL Indicator Always On
- TRACTION CONTROL Indicator Inoperative
- TRACTION OFF Message Always On
- TRACTION OFF Message Inoperative