Symptoms - Antilock Brake System

Symptoms - Antilock Brake System

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


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

* There are no DTCs set.
* The control modules can communicate via the serial data link.

2. Review the system operation in order to familiarize yourself with the system functions. Refer to ABS Description and Operation Description and Operation.

Visual/Physical Inspection

* Inspect for aftermarket devices, which could affect the operation of the antilock brake system. Refer to Checking Aftermarket Accessories 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 Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

* Brake Warning Indicator Inoperative Symptom Related Diagnostic Procedures
* No Communication with Electronic Brake Control Module (North America) No Communication with Electronic Brake Control Module (North America)No Communication with Electronic Brake Control Module (Except North America) No Communication with Electronic Brake Control Module (Except North America)
* ABS Indicator Always On (North America) ABS Indicator Always On (North America)ABS Indicator Always On (Except North America) ABS Indicator Always On (Except North America)
* ABS Indicator Inoperative (North America) ABS Indicator Inoperative (North America)ABS Indicator Inoperative (Except North America) ABS Indicator Inoperative (Except North America)
* Traction Off Indicator Always On Traction Off Indicator Always On
* Traction Off Indicator Inoperative Traction Off Indicator Inoperative