A Symptoms - Antilock Brake System

Symptoms - Antilock Brake System

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

1. Perform the Diagnostic System Check - ABS before using the Symptom Tables in order to verify that all of the following are true: Diagnostic System Check
^ 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.

Visual/Physical Inspection
^ Inspect for aftermarket devices which could affect the operation of the antilock brake system.
^ 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.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
^ ABS indicator Always On ABS Indicator Always On
^ ABS indicator Inoperative ABS Indicator Inoperative
^ Traction Off indicator Always On (w/NW9) Traction Off Indicator Always On (W/NW9)
^ Traction Off indicator Inoperative (w/NW9) Traction Off Indicator Inoperative (W/NW9)
^ Vehicle Stability Enhancement System Inoperative (w/JL4) Inoperative With RPO JL4
^ Vehicle Stability Enhancement System Unwanted Activation (w/JL4) Unwanted Activation With RPO JL4
^ Vehicle Stability Enhancement System Excessive Brake Pulsation Excessive Brake Pulsation