Testing Procedure

Two warning lights (ANTI-LOCK and BRAKE) alert vehicle operator of problems in braking system. Red BRAKE warning light monitors master cylinder fluid level and parking brake lever status. Amber ANTI-LOCK warning light alerts vehicle operator to problems in ABS system.

When trouble shooting ABS system, use test procedures in the order in which they are presented. Using other than recommended procedure could result in wasted time and/or unnecessary replacement of parts.

Testing sequence should be as follows: PRETEST CHECKS , ON-DEMAND SELF-TEST using ON-DEMAND SELF-TEST DIAGNOSTIC TROUBLE CODE (DTC) INDEX table, and TEST A through TEST P. If symptoms are present but codes cannot be retrieved, see ABS QUICK CHECK CHART and WARNING LIGHT SYMPTOM SEQUENCE CHART. See Figure and Figure .

NOTE: If necessary, also see ON-DEMAND SELF-TEST in MODULE COMMUNICATIONS NETWORK article in the ACCESSORIES & EQUIPMENT section.